重构项目，包括内存泄漏优化，分辨率切换，画面尺寸等

app/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 25
-    buildToolsVersion "26.0.1"
+    buildToolsVersion '26.0.2'
     defaultConfig {
         applicationId "com.jiangdg.usbcamera"
         minSdkVersion 16
@@ -28,5 +28,5 @@ dependencies {
     testCompile 'junit:junit:4.12'
     compile project(':libusbcamera')
     compile 'com.jakewharton:butterknife:8.8.1'
-    compile 'com.jakewharton:butterknife-compiler:8.8.1'
+    annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
 }

app/src/main/java/com/jiangdg/usbcamera/view/USBCameraActivity.java

@@ -1,17 +1,29 @@
 package com.jiangdg.usbcamera.view;
 
+import android.content.Intent;
 import android.hardware.usb.UsbDevice;
 import android.os.Bundle;
+import android.os.Looper;
 import android.support.annotation.Nullable;
+import android.support.v7.app.ActionBar;
+import android.support.v7.app.AlertDialog;
 import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuItem;
 import android.view.Surface;
 import android.view.View;
-import android.widget.Button;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.ListView;
+import android.widget.SeekBar;
+import android.widget.SimpleAdapter;
 import android.widget.Toast;
 
-import com.jiangdg.usbcamera.utils.FileUtils;
 import com.jiangdg.usbcamera.R;
-import com.jiangdg.usbcamera.USBCameraManager;
+import com.jiangdg.usbcamera.UVCCameraHelper;
+import com.jiangdg.usbcamera.utils.FileUtils;
 import com.serenegiant.usb.CameraDialog;
 import com.serenegiant.usb.Size;
 import com.serenegiant.usb.USBMonitor;
@@ -19,87 +31,92 @@ import com.serenegiant.usb.common.AbstractUVCCameraHandler;
 import com.serenegiant.usb.encoder.RecordParams;
 import com.serenegiant.usb.widget.CameraViewInterface;
 
+import java.util.ArrayList;
 import java.util.List;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
-import butterknife.OnClick;
 
 /**
- * AndroidUSBCamera引擎使用Demo
+ * UVCCamera use demo
- *
+ * <p>
  * Created by jiangdongguo on 2017/9/30.
  */
 
-public class USBCameraActivity extends AppCompatActivity implements CameraDialog.CameraDialogParent{
+public class USBCameraActivity extends AppCompatActivity implements CameraDialog.CameraDialogParent, CameraViewInterface.Callback {
     @BindView(R.id.camera_view)
     public View mTextureView;
-    @BindView(R.id.btn_capture_pic)
+    @BindView(R.id.toolbar)
-    public Button mBtnCapture;
+    public Toolbar mToolbar;
-    @BindView(R.id.btn_rec_video)
+    @BindView(R.id.seekbar_brightness)
-    public Button mBtnRecord;
+    public SeekBar mSeekBrightness;
-    @BindView(R.id.btn_update_resolution)
+    @BindView(R.id.seekbar_contrast)
-    public Button mBtnUpdateResultion;
+    public SeekBar mSeekContrast;
-    @BindView(R.id.btn_restart_camera)
+
-    Button mBtnRestartCamera;
+    private UVCCameraHelper mCameraHelper;
-    @BindView(R.id.btn_contrast)
-    Button mBtnContrast;
-    @BindView(R.id.btn_brightness)
-    Button mBtnBrightness;
-
-    private USBCameraManager mUSBManager;
-
     private CameraViewInterface mUVCCameraView;
+    private AlertDialog mDialog;
 
     private boolean isRequest;
     private boolean isPreview;
 
-    /**
+    private UVCCameraHelper.OnMyDevConnectListener listener = new UVCCameraHelper.OnMyDevConnectListener() {
-     * USB设备事件监听器
+
-     * */
-    private USBCameraManager.OnMyDevConnectListener listener = new USBCameraManager.OnMyDevConnectListener() {
-        // 插入USB设备
         @Override
         public void onAttachDev(UsbDevice device) {
-            if(mUSBManager == null || mUSBManager.getUsbDeviceCount() == 0){
+            if (mCameraHelper == null || mCameraHelper.getUsbDeviceCount() == 0) {
-                showShortMsg("未检测到USB摄像头设备");
+                showShortMsg("check no usb camera");
                 return;
             }
-            // 请求打开摄像头
+            // request open permission
-            if(! isRequest){
+            if (!isRequest) {
                 isRequest = true;
-                if(mUSBManager != null){
+                if (mCameraHelper != null) {
-                    mUSBManager.requestPermission(0);
+                    mCameraHelper.requestPermission(0);
                 }
             }
         }
 
-        // 拔出USB设备
         @Override
         public void onDettachDev(UsbDevice device) {
-            if(isRequest){
+            // close camera
-                // 关闭摄像头
+            if (isRequest) {
                 isRequest = false;
-                mUSBManager.closeCamera();
+                mCameraHelper.closeCamera();
-                showShortMsg(device.getDeviceName()+"已拨出");
+                showShortMsg(device.getDeviceName() + " is out");
             }
         }
 
-        // 连接USB设备成功
         @Override
-        public void onConnectDev(UsbDevice device,boolean isConnected) {
+        public void onConnectDev(UsbDevice device, boolean isConnected) {
-            if(! isConnected) {
+            if (!isConnected) {
-                showShortMsg("连接失败，请检查分辨率参数是否正确");
+                showShortMsg("fail to connect,please check resolution params");
                 isPreview = false;
-            }else{
+            } else {
                 isPreview = true;
+                showShortMsg("connecting");
+                // initialize seekbar
+                // need to wait UVCCamera initialize over
+                new Thread(new Runnable() {
+                    @Override
+                    public void run() {
+                        try {
+                            Thread.sleep(1500);
+                        } catch (InterruptedException e) {
+                            e.printStackTrace();
+                        }
+                        Looper.prepare();
+                        mSeekBrightness.setProgress(mCameraHelper.getModelValue(UVCCameraHelper.MODE_BRIGHTNESS));
+                        mSeekContrast.setProgress(mCameraHelper.getModelValue(UVCCameraHelper.MODE_CONTRAST));
+                        Looper.loop();
+                    }
+                }).start();
             }
         }
 
-        // 与USB设备断开连接
         @Override
         public void onDisConnectDev(UsbDevice device) {
-            showShortMsg("连接失败");
+            showShortMsg("disconnecting");
         }
     };
 
@@ -108,150 +125,121 @@ public class USBCameraActivity extends AppCompatActivity implements CameraDialog
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_usbcamera);
         ButterKnife.bind(this);
+        initView();
+        // step.1 initialize UVCCameraHelper
         mUVCCameraView = (CameraViewInterface) mTextureView;
-        mUVCCameraView.setCallback(new CameraViewInterface.Callback() {
+        mUVCCameraView.setCallback(this);
+        mCameraHelper = UVCCameraHelper.getInstance();
+        mCameraHelper.initUSBMonitor(this, mUVCCameraView, listener);
+    }
+
+    private void initView() {
+        setSupportActionBar(mToolbar);
+        ActionBar actionBar = getSupportActionBar();
+        if (actionBar != null) {
+            actionBar.setDisplayHomeAsUpEnabled(true);
+        }
+        mSeekBrightness.setMax(100);
+        mSeekBrightness.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
             @Override
-            public void onSurfaceCreated(CameraViewInterface view, Surface surface) {
+            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
-                if(!isPreview && mUSBManager.isCameraOpened()) {
+                if(mCameraHelper != null && mCameraHelper.isCameraOpened()) {
-                    mUSBManager.startPreview(mUVCCameraView, new AbstractUVCCameraHandler.OnPreViewResultListener() {
+                    mCameraHelper.setModelValue(UVCCameraHelper.MODE_BRIGHTNESS,progress);
+                }
+            }
+
             @Override
-                        public void onPreviewResult(boolean result) {
+            public void onStartTrackingTouch(SeekBar seekBar) {
+
+            }
+
+            @Override
+            public void onStopTrackingTouch(SeekBar seekBar) {
 
             }
         });
-                    isPreview = true;
+        mSeekContrast.setMax(100);
+        mSeekContrast.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
+            @Override
+            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+                if(mCameraHelper != null && mCameraHelper.isCameraOpened()) {
+                    mCameraHelper.setModelValue(UVCCameraHelper.MODE_CONTRAST,progress);
                 }
             }
 
             @Override
-            public void onSurfaceChanged(CameraViewInterface view, Surface surface, int width, int height) {
+            public void onStartTrackingTouch(SeekBar seekBar) {
 
             }
 
             @Override
-            public void onSurfaceDestroy(CameraViewInterface view, Surface surface) {
+            public void onStopTrackingTouch(SeekBar seekBar) {
-                if(isPreview && mUSBManager.isCameraOpened()) {
+
-                    mUSBManager.stopPreview();
-                    isPreview = false;
-                }
             }
         });
-        // 初始化引擎
-        mUSBManager = USBCameraManager.getInstance();
-        mUSBManager.initUSBMonitor(this,listener);
-        mUSBManager.createUVCCamera(mUVCCameraView);
-
     }
 
     @Override
     protected void onStart() {
         super.onStart();
-        if(mUSBManager == null)
+        // step.2 register USB event broadcast
-            return;
+        if (mCameraHelper != null) {
-        // 注册USB事件广播监听器
+            mCameraHelper.registerUSB();
-        mUSBManager.registerUSB();
+        }
-        mUVCCameraView.onResume();
     }
 
     @Override
     protected void onStop() {
         super.onStop();
-        // 注销USB事件广播监听器
+        // step.3 unregister USB event broadcast
-        if(mUSBManager != null){
+        if (mCameraHelper != null) {
-            mUSBManager.unregisterUSB();
+            mCameraHelper.unregisterUSB();
         }
-        mUVCCameraView.onPause();
     }
 
-    @OnClick({ R.id.btn_contrast,R.id.btn_brightness,R.id.btn_capture_pic, R.id.btn_rec_video,R.id.btn_update_resolution,R.id.btn_restart_camera})
-    public void onViewClick(View view) {
-        int vId = view.getId();
-        switch (vId) {
-            // 对比度
-            case R.id.btn_contrast:
-                if(mUSBManager == null || !mUSBManager.isCameraOpened())
-                    return;
-                int contrast = mUSBManager.getModelValue(USBCameraManager.MODE_CONTRAST);
-                mUSBManager.setModelValue(USBCameraManager.MODE_CONTRAST,contrast++);
-                break;
-            // 亮度
-            case R.id.btn_brightness:
-                if(mUSBManager == null || !mUSBManager.isCameraOpened())
-                    return;
-                int brightness = mUSBManager.getModelValue(USBCameraManager.MODE_BRIGHTNESS);
-                mUSBManager.setModelValue(USBCameraManager.MODE_BRIGHTNESS,brightness++);
-                break;
-            // 重启Camera
-            case R.id.btn_restart_camera:
-
-                break;
-            // 切换分辨率
-            case R.id.btn_update_resolution:
-                if(mUSBManager == null || !mUSBManager.isCameraOpened())
-                    return;
-                mUSBManager.updateResolution(320, 240, new USBCameraManager.OnPreviewListener() {
     @Override
-                    public void onPreviewResult(boolean isSuccess) {
+    public boolean onCreateOptionsMenu(Menu menu) {
-                        if(! isSuccess) {
+        getMenuInflater().inflate(R.menu.main_toobar, menu);
-                            showShortMsg("预览失败，不支持该分辨率");
+        return true;
-                        }else {
-                            showShortMsg("以切换到分辨率为320x240");
-                        }
-                    }
-                });
-                break;
-            // 点击后自动对焦
-            case R.id.camera_view:
-                if(mUSBManager == null)
-                    return;
-//                mUSBManager.startCameraFoucs();
-//                showShortMsg("对焦相机");
-                List<Size> list = mUSBManager.getSupportedPreviewSizes();
-                if(list == null) {
-                    return;
     }
 
-                StringBuilder sb = new StringBuilder();
+    @Override
-                for(Size size:list){
+    public boolean onOptionsItemSelected(MenuItem item) {
-                    sb.append(size.width+"x"+size.height);
+        switch (item.getItemId()) {
-                    sb.append("\n");
+            case R.id.menu_takepic:
-                }
+                if (mCameraHelper == null || !mCameraHelper.isCameraOpened()) {
-                showShortMsg(sb.toString());
+                    showShortMsg("sorry,camera open failed");
-                break;
+                    return super.onOptionsItemSelected(item);
-            case R.id.btn_capture_pic:
+                }
-                if(mUSBManager == null || ! mUSBManager.isCameraOpened()){
+                String picPath = UVCCameraHelper.ROOT_PATH + System.currentTimeMillis()
-                    showShortMsg("抓拍异常，摄像头未开启");
+                        + UVCCameraHelper.SUFFIX_PNG;
-                    return;
+                mCameraHelper.capturePicture(picPath, new AbstractUVCCameraHandler.OnCaptureListener() {
-                }
-                String picPath = USBCameraManager.ROOT_PATH+System.currentTimeMillis()
-                        +USBCameraManager.SUFFIX_PNG;
-                mUSBManager.capturePicture(picPath, new AbstractUVCCameraHandler.OnCaptureListener() {
                     @Override
                     public void onCaptureResult(String path) {
-                        showShortMsg("保存路径："+path);
+                        showShortMsg("save path：" + path);
                     }
                 });
                 break;
-            case R.id.btn_rec_video:
+            case R.id.menu_recording:
-                if(mUSBManager == null || ! mUSBManager.isCameraOpened()){
+                if (mCameraHelper == null || !mCameraHelper.isCameraOpened()) {
-                    showShortMsg("录制异常，摄像头未开启");
+                    showShortMsg("sorry,camera open failed");
-                    return;
+                    return super.onOptionsItemSelected(item);
                 }
 
-                if(! mUSBManager.isRecording()){
+                if (!mCameraHelper.isRecording()) {
-                    String videoPath = USBCameraManager.ROOT_PATH+System.currentTimeMillis();
+                    String videoPath = UVCCameraHelper.ROOT_PATH + System.currentTimeMillis();
-                    FileUtils.createfile(FileUtils.ROOT_PATH+"test666.h264");
+                    FileUtils.createfile(FileUtils.ROOT_PATH + "test666.h264");
                     RecordParams params = new RecordParams();
                     params.setRecordPath(videoPath);
                     params.setRecordDuration(0);    // 设置为0，不分割保存
                     params.setVoiceClose(false);    // 不屏蔽声音
-                    mUSBManager.startRecording(params, new AbstractUVCCameraHandler.OnEncodeResultListener() {
+                    mCameraHelper.startRecording(params, new AbstractUVCCameraHandler.OnEncodeResultListener() {
                         @Override
                         public void onEncodeResult(byte[] data, int offset, int length, long timestamp, int type) {
-                            // type = 0,aac格式音频流
+                            // type = 0,aac stream
-                            // type = 1,h264格式视频流
+                            // type = 1,h264 stream
-                            if(type == 1){
+                            if (type == 1) {
-                                FileUtils.putFileStream(data,offset,length);
+                                FileUtils.putFileStream(data, offset, length);
                             }
                         }
 
@@ -260,22 +248,171 @@ public class USBCameraActivity extends AppCompatActivity implements CameraDialog
                             showShortMsg(videoPath);
                         }
                     });
-
+                    showShortMsg("start record...");
-                    mBtnRecord.setText("正在录制");
                 } else {
                     FileUtils.releaseFile();
-                    mUSBManager.stopRecording();
+                    mCameraHelper.stopRecording();
-                    mBtnRecord.setText("开始录制");
+                    showShortMsg("stop record...");
                 }
                 break;
+            case R.id.menu_resolution:
+                showResolutionListDialog();
+                break;
+            case R.id.menu_focus:
+                if (mCameraHelper != null) {
+                    mCameraHelper.startCameraFoucs();
+                }
+                break;
+        }
+        return super.onOptionsItemSelected(item);
+    }
+
+    private void showResolutionListDialog() {
+        AlertDialog.Builder builder = new AlertDialog.Builder(USBCameraActivity.this);
+        View rootView = LayoutInflater.from(USBCameraActivity.this).inflate(R.layout.layout_dialog_list, null);
+        ListView listView = (ListView) rootView.findViewById(R.id.listview_dialog);
+        ArrayAdapter<String> adapter = new ArrayAdapter<String>(USBCameraActivity.this, android.R.layout.simple_list_item_1, getResolutionList());
+        if (adapter != null) {
+            listView.setAdapter(adapter);
+        }
+        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
+            @Override
+            public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
+                if (mCameraHelper == null || !mCameraHelper.isCameraOpened())
+                    return;
+                final String resolution = (String) adapterView.getItemAtPosition(position);
+                String[] tmp = resolution.split("x");
+                if (tmp != null && tmp.length >= 2) {
+                    int widht = Integer.valueOf(tmp[0]);
+                    int height = Integer.valueOf(tmp[1]);
+                    mCameraHelper.updateResolution(widht, height, new UVCCameraHelper.OnPreviewListener() {
+                        @Override
+                        public void onPreviewResult(boolean isSuccess) {
+                            if (isSuccess) {
+                                showShortMsg("update resolution to " + resolution + " success");
                             }
                         }
+                    });
+                }
+                mDialog.dismiss();
+            }
+        });
+
+        builder.setView(rootView);
+        mDialog = builder.create();
+        mDialog.show();
+    }
+
+    // example: {640x480,320x240,etc}
+    private List<String> getResolutionList() {
+        List<Size> list = mCameraHelper.getSupportedPreviewSizes();
+        List<String> resolutions = null;
+        if (list != null && list.size() != 0) {
+            resolutions = new ArrayList<>();
+            for (Size size : list) {
+                if (size != null) {
+                    resolutions.add(size.width + "x" + size.height);
+                }
+            }
+        }
+        return resolutions;
+    }
+
+    //    @OnClick({R.id.btn_contrast, R.id.btn_brightness, R.id.btn_capture_pic, R.id.btn_rec_video, R.id.btn_update_resolution, R.id.btn_restart_camera})
+//    public void onViewClick(View view) {
+//        int vId = view.getId();
+//        switch (vId) {
+//            case R.id.btn_contrast:
+//                if (mUSBManager == null || !mUSBManager.isCameraOpened())
+//                    return;
+//                int contrast = mUSBManager.getModelValue(UVCCameraHelper.MODE_CONTRAST);
+//                mUSBManager.setModelValue(UVCCameraHelper.MODE_CONTRAST, contrast++);
+//                break;
+//            case R.id.btn_brightness:
+//                if (mUSBManager == null || !mUSBManager.isCameraOpened())
+//                    return;
+//                int brightness = mUSBManager.getModelValue(UVCCameraHelper.MODE_BRIGHTNESS);
+//                mUSBManager.setModelValue(UVCCameraHelper.MODE_BRIGHTNESS, brightness++);
+//                break;
+//            case R.id.btn_update_resolution:
+
+//                break;
+//            case R.id.camera_view:
+//                if (mUSBManager == null)
+//                    return;
+////                mUSBManager.startCameraFoucs();
+////                showShortMsg("对焦相机");
+//                List<Size> list = mUSBManager.getSupportedPreviewSizes();
+//                if (list == null) {
+//                    return;
+//                }
+//
+//                StringBuilder sb = new StringBuilder();
+//                for (Size size : list) {
+//                    sb.append(size.width + "x" + size.height);
+//                    sb.append("\n");
+//                }
+//                showShortMsg(sb.toString());
+//                break;
+//            case R.id.btn_capture_pic:
+//                if (mUSBManager == null || !mUSBManager.isCameraOpened()) {
+//                    showShortMsg("抓拍异常，摄像头未开启");
+//                    return;
+//                }
+//                String picPath = UVCCameraHelper.ROOT_PATH + System.currentTimeMillis()
+//                        + UVCCameraHelper.SUFFIX_PNG;
+//                mUSBManager.capturePicture(picPath, new AbstractUVCCameraHandler.OnCaptureListener() {
+//                    @Override
+//                    public void onCaptureResult(String path) {
+//                        showShortMsg("保存路径：" + path);
+//                    }
+//                });
+//                break;
+//            case R.id.btn_rec_video:
+//                if (mUSBManager == null || !mUSBManager.isCameraOpened()) {
+//                    showShortMsg("录制异常，摄像头未开启");
+//                    return;
+//                }
+//
+//                if (!mUSBManager.isRecording()) {
+//                    String videoPath = UVCCameraHelper.ROOT_PATH + System.currentTimeMillis();
+//                    FileUtils.createfile(FileUtils.ROOT_PATH + "test666.h264");
+//                    RecordParams params = new RecordParams();
+//                    params.setRecordPath(videoPath);
+//                    params.setRecordDuration(0);    // 设置为0，不分割保存
+//                    params.setVoiceClose(false);    // 不屏蔽声音
+//                    mUSBManager.startRecording(params, new AbstractUVCCameraHandler.OnEncodeResultListener() {
+//                        @Override
+//                        public void onEncodeResult(byte[] data, int offset, int length, long timestamp, int type) {
+//                            // type = 0,aac格式音频流
+//                            // type = 1,h264格式视频流
+//                            if (type == 1) {
+//                                FileUtils.putFileStream(data, offset, length);
+//                            }
+//                        }
+//
+//                        @Override
+//                        public void onRecordResult(String videoPath) {
+//                            showShortMsg(videoPath);
+//                        }
+//                    });
+//
+//                    mBtnRecord.setText("正在录制");
+//                } else {
+//                    FileUtils.releaseFile();
+//                    mUSBManager.stopRecording();
+//                    mBtnRecord.setText("开始录制");
+//                }
+//                break;
+//        }
+//    }
 
     @Override
     protected void onDestroy() {
         super.onDestroy();
-        if(mUSBManager != null){
+        // step.4 release uvc camera resources
-            mUSBManager.release();
+        if (mCameraHelper != null) {
+            mCameraHelper.release();
         }
     }
 
@@ -285,17 +422,43 @@ public class USBCameraActivity extends AppCompatActivity implements CameraDialog
 
     @Override
     public USBMonitor getUSBMonitor() {
-        return mUSBManager.getUSBMonitor();
+        return mCameraHelper.getUSBMonitor();
     }
 
     @Override
     public void onDialogResult(boolean canceled) {
-        if(canceled){
+        if (canceled) {
             showShortMsg("取消操作");
         }
     }
 
     public boolean isCameraOpened() {
-        return mUSBManager.isCameraOpened();
+        return mCameraHelper.isCameraOpened();
+    }
+
+    @Override
+    public void onSurfaceCreated(CameraViewInterface view, Surface surface) {
+        if (!isPreview && mCameraHelper.isCameraOpened()) {
+            mCameraHelper.startPreview(mUVCCameraView, new AbstractUVCCameraHandler.OnPreViewResultListener() {
+                @Override
+                public void onPreviewResult(boolean result) {
+
+                }
+            });
+            isPreview = true;
+        }
+    }
+
+    @Override
+    public void onSurfaceChanged(CameraViewInterface view, Surface surface, int width, int height) {
+
+    }
+
+    @Override
+    public void onSurfaceDestroy(CameraViewInterface view, Surface surface) {
+        if (isPreview && mCameraHelper.isCameraOpened()) {
+            mCameraHelper.stopPreview();
+            isPreview = false;
+        }
     }
 }

app/src/main/res/layout/activity_usbcamera.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -7,68 +8,73 @@
     tools:context=".view.USBCameraActivity"
     tools:ignore="MergeRootFrame">
 
-    <Button
+    <android.support.v7.widget.Toolbar
-        android:id="@+id/btn_contrast"
+        android:id="@+id/toolbar"
-        android:layout_width="wrap_content"
+        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
+        android:layout_height="?attr/actionBarSize"
-        android:layout_alignParentLeft="true"
+        android:background="@color/colorPrimary"
-        android:layout_alignParentTop="true"
+        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
-        android:text="对比度调整" />
+        app:navigationIcon="@null"
-
+        app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
-    <Button
-        android:id="@+id/btn_brightness"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_alignParentRight="true"
-        android:layout_alignParentTop="true"
-        android:text="亮度调整" />
 
     <com.serenegiant.usb.widget.UVCCameraTextureView
         android:id="@+id/camera_view"
+        android:layout_below="@id/toolbar"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:layout_centerHorizontal="true"
         android:layout_centerVertical="true" />
 
-    <Button
+    <LinearLayout
-        android:id="@+id/btn_capture_pic"
+        android:id="@+id/llayout_contrast"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentBottom="true"
-        android:layout_marginBottom="10dp"
         android:layout_marginLeft="10dp"
         android:layout_marginRight="10dp"
-        android:text="抓拍"
+        android:layout_marginBottom="10dp"
-        android:textSize="16sp" />
+        android:orientation="horizontal">
 
-    <Button
+        <TextView
-        android:id="@+id/btn_rec_video"
+            android:layout_width="0dp"
-        android:layout_width="match_parent"
             android:layout_height="wrap_content"
-        android:layout_above="@id/btn_capture_pic"
+            android:paddingBottom="7dp"
-        android:layout_marginLeft="10dp"
+            android:paddingTop="7dp"
-        android:layout_marginRight="10dp"
+            android:layout_weight="1"
-        android:text="开始录制"
+            android:textColor="@color/colorWhite"
-        android:textSize="16sp" />
+            android:text="对比度(contrast)" />
+
+        <SeekBar
+            android:id="@+id/seekbar_contrast"
+            android:layout_width="0dp"
+            android:layout_weight="2"
+            android:layout_height="match_parent" />
+    </LinearLayout>
 
-    <Button
+    <LinearLayout
-        android:id="@+id/btn_update_resolution"
+        android:id="@+id/llayout_brightness"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_above="@id/btn_rec_video"
+        android:layout_above="@id/llayout_contrast"
+        android:layout_marginBottom="10dp"
         android:layout_marginLeft="10dp"
         android:layout_marginRight="10dp"
-        android:text="切换分辨率为320x240"
+        android:orientation="horizontal">
-        android:textSize="16sp" />
 
-    <Button
+        <TextView
-        android:id="@+id/btn_restart_camera"
+            android:layout_width="0dp"
-        android:layout_width="match_parent"
             android:layout_height="wrap_content"
-        android:layout_above="@id/btn_update_resolution"
+            android:paddingBottom="7dp"
-        android:layout_marginLeft="10dp"
+            android:paddingTop="7dp"
-        android:layout_marginRight="10dp"
+            android:layout_weight="1"
-        android:text="重启摄像头"
+            android:text="亮度(brightness)"
-        android:textSize="16sp" />
+            android:textColor="@color/colorWhite" />
+
+        <SeekBar
+            android:id="@+id/seekbar_brightness"
+            android:layout_width="0dp"
+            android:layout_weight="2"
+            android:layout_height="match_parent" />
+    </LinearLayout>
 
 </RelativeLayout>

app/src/main/res/layout/layout_dialog_list.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical" android:layout_width="match_parent"
+    android:layout_height="match_parent">
+    <ListView
+        android:id="@+id/listview_dialog"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+</LinearLayout>

app/src/main/res/menu/main_toobar.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:id="@+id/menu_takepic"
+        android:title="takingPhotos(拍照)"
+        app:showAsAction="never" />
+    <item
+        android:id="@+id/menu_recording"
+        android:title="recording(录像)"
+        app:showAsAction="never" />
+    <item
+        android:id="@+id/menu_focus"
+        android:title="cameraFocus(对焦)"
+        app:showAsAction="never" />
+    <item
+        android:id="@+id/menu_resolution"
+        android:title="resolution(分辨率)"
+        app:showAsAction="never" />
+</menu>

app/src/main/res/values/colors.xml

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="colorPrimary">#3F51B5</color>
+    <color name="colorPrimary">#303F9F</color>
     <color name="colorPrimaryDark">#303F9F</color>
     <color name="colorAccent">#FF4081</color>
     <color name="colorBlack">#000000</color>
+    <color name="colorWhite">#FFFFFF</color>
 </resources>

app/src/main/res/values/strings.xml

@@ -1,3 +1,3 @@
 <resources>
-    <string name="app_name">AndroidUSBCamera</string>
+    <string name="app_name">UVCCamera</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -1,7 +1,7 @@
 <resources>
 
     <!-- Base application theme. -->
-    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
         <!-- Customize your theme here. -->
         <item name="colorPrimary">@color/colorPrimary</item>
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>

build.gradle

@@ -4,7 +4,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.1'
+        classpath 'com.android.tools.build:gradle:3.0.0'
     }
 }
 

libusbcamera/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.library'
 
 android {
     compileSdkVersion 25
-    buildToolsVersion "26.0.1"
+    buildToolsVersion '26.0.2'
 
     defaultConfig {
         minSdkVersion 16

libusbcamera/src/main/java/com/jiangdg/usbcamera/USBCameraManager.java

@@ -1,360 +0,0 @@
-package com.jiangdg.usbcamera;
-
-import android.app.Activity;
-import android.content.Context;
-import android.graphics.SurfaceTexture;
-import android.hardware.usb.UsbDevice;
-import android.os.Environment;
-
-import com.jiangdg.libusbcamera.R;
-import com.serenegiant.usb.DeviceFilter;
-import com.serenegiant.usb.Size;
-import com.serenegiant.usb.USBMonitor;
-import com.serenegiant.usb.UVCCamera;
-import com.serenegiant.usb.common.AbstractUVCCameraHandler;
-import com.serenegiant.usb.common.UVCCameraHandler;
-import com.serenegiant.usb.encoder.RecordParams;
-import com.serenegiant.usb.widget.CameraViewInterface;
-
-import java.io.File;
-import java.util.List;
-
-/**USB摄像头工具类
- *
- * Created by jiangdongguo on 2017/9/30.
- */
-
-public class USBCameraManager{
-    public static final String ROOT_PATH = Environment.getExternalStorageDirectory().getAbsolutePath()
-            + File.separator;
-    public static final String SUFFIX_PNG = ".png";
-    public static final String SUFFIX_MP4 = ".mp4";
-    private static final String TAG = "USBCameraManager";
-    private int previewWidth = 640;
-    private int previewHeight = 480;
-    public static int MODE_BRIGHTNESS = UVCCamera.PU_BRIGHTNESS;
-    public static int MODE_CONTRAST = UVCCamera.PU_CONTRAST;
-    // 使用MediaVideoBufferEncoder
-    private static final int ENCODER_TYPE = 2;
-    //0为YUYV，1为MJPEG
-    private static final int PREVIEW_FORMAT = 0;
-
-    private static USBCameraManager mUsbCamManager;
-    // USB设备管理类
-    private USBMonitor mUSBMonitor;
-    // Camera业务逻辑处理
-    private UVCCameraHandler mCameraHandler;
-    // 上下文
-    private Activity mActivity;
-
-    private USBMonitor.UsbControlBlock mCtrlBlock;
-    private CameraViewInterface cameraView;
-
-    private USBCameraManager(){}
-
-    public static USBCameraManager getInstance(){
-        if(mUsbCamManager == null){
-            mUsbCamManager = new USBCameraManager();
-        }
-        return mUsbCamManager;
-    }
-
-    public void closeCamera() {
-        if(mCameraHandler != null){
-            mCameraHandler.close();
-        }
-    }
-
-    public interface OnMyDevConnectListener{
-        void onAttachDev(UsbDevice device);
-        void onDettachDev(UsbDevice device);
-
-        void onConnectDev(UsbDevice device,boolean isConnected);
-        void onDisConnectDev(UsbDevice device);
-    }
-
-    public interface OnPreviewListener{
-        void onPreviewResult(boolean isSuccess);
-    }
-
-    /** 初始化
-     *
-     *  context  上下文
-     *  cameraView Camera要渲染的Surface
-     *  listener USB设备检测与连接状态事件监听器
-     * */
-    public void initUSBMonitor(Activity activity,final OnMyDevConnectListener listener){
-        this.mActivity = activity;
-
-        mUSBMonitor = new USBMonitor(activity.getApplicationContext(), new USBMonitor.OnDeviceConnectListener() {
-
-            // 当检测到USB设备，被回调
-            @Override
-            public void onAttach(UsbDevice device) {
-                if(listener != null){
-                    listener.onAttachDev(device);
-                }
-            }
-
-            // 当拨出或未检测到USB设备，被回调
-            @Override
-            public void onDettach(UsbDevice device) {
-                if(listener != null){
-                    listener.onDettachDev(device);
-                }
-            }
-
-            // 当连接到USB Camera时，被回调
-            @Override
-            public void onConnect(final UsbDevice device, USBMonitor.UsbControlBlock ctrlBlock, boolean createNew) {
-                mCtrlBlock = ctrlBlock;
-                // 打开摄像头
-                openCamera(ctrlBlock);
-                // 开启预览
-                startPreview(cameraView, new AbstractUVCCameraHandler.OnPreViewResultListener() {
-                    @Override
-                    public void onPreviewResult(boolean isConnected) {
-                        if(listener != null){
-                            listener.onConnectDev(device,isConnected);
-                        }
-                    }
-                });
-            }
-
-            // 当与USB Camera断开连接时，被回调
-            @Override
-            public void onDisconnect(UsbDevice device, USBMonitor.UsbControlBlock ctrlBlock) {
-                if(listener != null){
-                    listener.onDisConnectDev(device);
-                }
-            }
-
-            @Override
-            public void onCancel(UsbDevice device) {
-            }
-        });
-    }
-
-    public void createUVCCamera(CameraViewInterface cameraView) {
-        if(cameraView == null)
-            throw new NullPointerException("CameraViewInterface cannot be null!");
-
-        // 释放CameraHandler占用的相关资源
-        if(mCameraHandler != null){
-            mCameraHandler.release();
-            mCameraHandler = null;
-        }
-        // 重新初始化mCameraHandler
-        this.cameraView = cameraView;
-        cameraView.setAspectRatio(previewWidth / (float)previewHeight);
-        mCameraHandler = UVCCameraHandler.createHandler(mActivity,cameraView,ENCODER_TYPE,
-                previewWidth,previewHeight,PREVIEW_FORMAT);
-    }
-
-    // 切换分辨率
-    public void updateResolution(int width, int height, final OnPreviewListener mPreviewListener){
-        // 如果分辨率无变化，则无需重启Camera
-        if(previewWidth == width && previewHeight == height){
-            return;
-        }
-        this.previewWidth = width;
-        this.previewHeight = height;
-        // 释放CameraHandler占用的相关资源
-        if(mCameraHandler != null){
-            mCameraHandler.release();
-            mCameraHandler = null;
-        }
-        // 重新初始化mCameraHandler
-        cameraView.setAspectRatio(previewWidth / (float)previewHeight);
-        mCameraHandler = UVCCameraHandler.createHandler(mActivity,cameraView,ENCODER_TYPE,
-                previewWidth,previewHeight,PREVIEW_FORMAT);
-        openCamera(mCtrlBlock);
-        // 开始预览
-        startPreview(cameraView, new AbstractUVCCameraHandler.OnPreViewResultListener() {
-            @Override
-            public void onPreviewResult(boolean result) {
-                if(mPreviewListener != null){
-                    mPreviewListener.onPreviewResult(result);
-                }
-            }
-        });
-    }
-
-    public void restartUSBCamera(CameraViewInterface cameraView,final OnPreviewListener mPreviewListener){
-        if(mCtrlBlock == null || cameraView == null)
-           throw new NullPointerException("mCtrlBlock or cameraView is null,please connected to camera");
-
-        // 创建Camera管理线程
-        createUVCCamera(cameraView);
-        // 创建Camera
-        openCamera(mCtrlBlock);
-        // 开始预览
-        startPreview(cameraView, new AbstractUVCCameraHandler.OnPreViewResultListener() {
-            @Override
-            public void onPreviewResult(boolean result) {
-                if(mPreviewListener != null){
-                    mPreviewListener.onPreviewResult(result);
-                }
-            }
-        });
-    }
-
-    /**
-     * 注册检测USB设备广播接收器
-     * */
-    public void registerUSB(){
-        if(mUSBMonitor != null){
-            mUSBMonitor.register();
-        }
-    }
-
-    /**
-     *  注销检测USB设备广播接收器
-     */
-    public void unregisterUSB(){
-        if(mUSBMonitor != null){
-            mUSBMonitor.unregister();
-        }
-    }
-
-    public boolean checkSupportFlag(final int flag) {
-        return mCameraHandler != null && mCameraHandler.checkSupportFlag(flag);
-    }
-
-    public int getModelValue(final int flag) {
-        return mCameraHandler != null ? mCameraHandler.getValue(flag) : 0;
-    }
-
-    public int setModelValue(final int flag, final int value) {
-        return mCameraHandler != null ? mCameraHandler.setValue(flag, value) : 0;
-    }
-
-    public int resetModelValue(final int flag) {
-        return mCameraHandler != null ? mCameraHandler.resetValue(flag) : 0;
-    }
-
-    /**
-     *  请求开启第index USB摄像头
-     */
-    public void requestPermission(int index){
-        List<UsbDevice> devList = getUsbDeviceList();
-        if(devList==null || devList.size() ==0){
-            return;
-        }
-        int count = devList.size();
-        if(index >= count)
-            new IllegalArgumentException("index illegal,should be < devList.size()");
-        if(mUSBMonitor != null) {
-            mUSBMonitor.requestPermission(getUsbDeviceList().get(index));
-        }
-    }
-
-    // 返回USB设备列表数量
-    public int getUsbDeviceCount(){
-        List<UsbDevice> devList = getUsbDeviceList();
-        if(devList==null || devList.size() ==0){
-            return 0;
-        }
-        return devList.size();
-    }
-
-    // 返回USB设备列表
-    public List<UsbDevice> getUsbDeviceList(){
-        List<DeviceFilter> deviceFilters = DeviceFilter.getDeviceFilters(mActivity.getApplicationContext(), R.xml.device_filter);
-        if(mUSBMonitor == null || deviceFilters == null)
-            return null;
-        return mUSBMonitor.getDeviceList(deviceFilters.get(0));
-    }
-
-    // 拍照
-    public void capturePicture(String savePath,AbstractUVCCameraHandler.OnCaptureListener listener){
-        if(mCameraHandler != null && mCameraHandler.isOpened()){
-            mCameraHandler.captureStill(savePath,listener);
-        }
-    }
-
-    // 开始录像
-    public void startRecording(RecordParams params, AbstractUVCCameraHandler.OnEncodeResultListener listener){
-        if(mCameraHandler != null && ! isRecording()){
-            mCameraHandler.startRecording(params,listener);
-        }
-    }
-
-    // 停止录像
-    public void stopRecording(){
-        if(mCameraHandler != null && isRecording()){
-            mCameraHandler.stopRecording();
-        }
-    }
-
-    // 是否正在录像
-    public boolean isRecording(){
-        if(mCameraHandler != null){
-            return mCameraHandler.isRecording();
-        }
-        return false;
-    }
-
-    // 是否打开Camera
-    public boolean isCameraOpened(){
-        if(mCameraHandler != null){
-            return mCameraHandler.isOpened();
-        }
-        return false;
-    }
-
-    // 释放资源
-    public void release(){
-        //释放CameraHandler占用的相关资源
-        if(mCameraHandler != null){
-            mCameraHandler.release();
-            mCameraHandler = null;
-        }
-        // 释放USBMonitor占用的相关资源
-        if(mUSBMonitor != null){
-            mUSBMonitor.destroy();
-            mUSBMonitor = null;
-        }
-    }
-
-    public USBMonitor getUSBMonitor() {
-        return mUSBMonitor;
-    }
-
-
-    // 打开Camera
-    private void openCamera(USBMonitor.UsbControlBlock ctrlBlock) {
-        if(mCameraHandler != null){
-            mCameraHandler.open(ctrlBlock);
-        }
-    }
-
-    // 开始预览
-    public void startPreview(CameraViewInterface cameraView,AbstractUVCCameraHandler.OnPreViewResultListener mPreviewListener) {
-        SurfaceTexture st = cameraView.getSurfaceTexture();
-        if(mCameraHandler != null){
-            mCameraHandler.startPreview(st,mPreviewListener);
-        }
-    }
-
-    // 停止预览
-    public void stopPreview() {
-        if(mCameraHandler != null){
-            mCameraHandler.stopPreview();
-        }
-    }
-
-    // Camera对焦
-    public void startCameraFoucs(){
-        if(mCameraHandler != null){
-            mCameraHandler.startCameraFoucs();
-        }
-    }
-
-    // 获取Camera支持的所有分辨率参数
-    public List<Size> getSupportedPreviewSizes(){
-        if(mCameraHandler == null)
-            return null;
-        return mCameraHandler.getSupportedPreviewSizes();
-    }
-}

libusbcamera/src/main/java/com/jiangdg/usbcamera/UVCCameraHelper.java

@@ -0,0 +1,311 @@
+package com.jiangdg.usbcamera;
+
+import android.app.Activity;
+import android.graphics.SurfaceTexture;
+import android.hardware.usb.UsbDevice;
+import android.os.Environment;
+
+import com.jiangdg.libusbcamera.R;
+import com.serenegiant.usb.DeviceFilter;
+import com.serenegiant.usb.Size;
+import com.serenegiant.usb.USBMonitor;
+import com.serenegiant.usb.UVCCamera;
+import com.serenegiant.usb.common.AbstractUVCCameraHandler;
+import com.serenegiant.usb.common.UVCCameraHandler;
+import com.serenegiant.usb.encoder.RecordParams;
+import com.serenegiant.usb.widget.CameraViewInterface;
+
+import java.io.File;
+import java.lang.ref.WeakReference;
+import java.util.List;
+
+/** UVCCamera Helper class
+ *
+ * Created by jiangdongguo on 2017/9/30.
+ */
+
+public class UVCCameraHelper {
+    public static final String ROOT_PATH = Environment.getExternalStorageDirectory().getAbsolutePath()
+            + File.separator;
+    public static final String SUFFIX_PNG = ".png";
+    public static final String SUFFIX_MP4 = ".mp4";
+    private static final String TAG = "UVCCameraHelper";
+    private int previewWidth = 640;
+    private int previewHeight = 480;
+    public static int MODE_BRIGHTNESS = UVCCamera.PU_BRIGHTNESS;
+    public static int MODE_CONTRAST = UVCCamera.PU_CONTRAST;
+    //0-YUYV，1-MJPEG
+    private static final int PREVIEW_FORMAT = 0;
+
+    private static UVCCameraHelper mCameraHelper;
+    // USB Manager
+    private USBMonitor mUSBMonitor;
+    // Camera Handler
+    private UVCCameraHandler mCameraHandler;
+    private USBMonitor.UsbControlBlock mCtrlBlock;
+
+    private WeakReference<Activity> mActivityWrf;
+    private WeakReference<CameraViewInterface> mCamViewWrf;
+
+    private UVCCameraHelper() {
+    }
+
+    public static UVCCameraHelper getInstance() {
+        if (mCameraHelper == null) {
+            mCameraHelper = new UVCCameraHelper();
+        }
+        return mCameraHelper;
+    }
+
+    public void closeCamera() {
+        if (mCameraHandler != null) {
+            mCameraHandler.close();
+        }
+    }
+
+    public interface OnMyDevConnectListener {
+        void onAttachDev(UsbDevice device);
+
+        void onDettachDev(UsbDevice device);
+
+        void onConnectDev(UsbDevice device, boolean isConnected);
+
+        void onDisConnectDev(UsbDevice device);
+    }
+
+    public interface OnPreviewListener {
+        void onPreviewResult(boolean isSuccess);
+    }
+
+    public void initUSBMonitor(Activity activity, CameraViewInterface cameraView, final OnMyDevConnectListener listener) {
+        this.mActivityWrf = new WeakReference<>(activity);
+        this.mCamViewWrf = new WeakReference<>(cameraView);
+        mUSBMonitor = new USBMonitor(activity.getApplicationContext(), new USBMonitor.OnDeviceConnectListener() {
+
+            // called by checking usb device
+            // do request device permission
+            @Override
+            public void onAttach(UsbDevice device) {
+                if (listener != null) {
+                    listener.onAttachDev(device);
+                }
+            }
+
+            // called by taking out usb device
+            // do close camera
+            @Override
+            public void onDettach(UsbDevice device) {
+                if (listener != null) {
+                    listener.onDettachDev(device);
+                }
+            }
+
+            // called by connect to usb camera
+            // do open camera,start previewing
+            @Override
+            public void onConnect(final UsbDevice device, USBMonitor.UsbControlBlock ctrlBlock, boolean createNew) {
+                mCtrlBlock = ctrlBlock;
+                openCamera(ctrlBlock);
+                startPreview(mCamViewWrf.get(), new AbstractUVCCameraHandler.OnPreViewResultListener() {
+                    @Override
+                    public void onPreviewResult(boolean isConnected) {
+                        if (listener != null) {
+                            listener.onConnectDev(device, isConnected);
+                        }
+                    }
+                });
+            }
+
+            // called by disconnect to usb camera
+            // do nothing
+            @Override
+            public void onDisconnect(UsbDevice device, USBMonitor.UsbControlBlock ctrlBlock) {
+                if (listener != null) {
+                    listener.onDisConnectDev(device);
+                }
+            }
+
+            @Override
+            public void onCancel(UsbDevice device) {
+            }
+        });
+
+        createUVCCamera();
+    }
+
+    public void createUVCCamera() {
+        if (mCamViewWrf.get() == null)
+            throw new NullPointerException("CameraViewInterface cannot be null!");
+
+        // release resources for initializing camera handler
+        if (mCameraHandler != null) {
+            mCameraHandler.release();
+            mCameraHandler = null;
+        }
+        // initialize camera handler
+//        cameraView.setAspectRatio(previewWidth / (float)previewHeight);
+        mCameraHandler = UVCCameraHandler.createHandler(mActivityWrf.get(), mCamViewWrf.get(), 2,
+                previewWidth, previewHeight, PREVIEW_FORMAT);
+    }
+
+    public void updateResolution(int width, int height, final OnPreviewListener mPreviewListener) {
+        if (previewWidth == width && previewHeight == height) {
+            return;
+        }
+        this.previewWidth = width;
+        this.previewHeight = height;
+        if (mCameraHandler != null) {
+            mCameraHandler.release();
+            mCameraHandler = null;
+        }
+//        cameraView.setAspectRatio(previewWidth / (float)previewHeight);
+        mCameraHandler = UVCCameraHandler.createHandler(mActivityWrf.get(), mCamViewWrf.get(), 2,
+                previewWidth, previewHeight, PREVIEW_FORMAT);
+        openCamera(mCtrlBlock);
+        startPreview(mCamViewWrf.get(), new AbstractUVCCameraHandler.OnPreViewResultListener() {
+            @Override
+            public void onPreviewResult(boolean result) {
+                if (mPreviewListener != null) {
+                    mPreviewListener.onPreviewResult(result);
+                }
+            }
+        });
+    }
+
+    public void registerUSB() {
+        if (mUSBMonitor != null) {
+            mUSBMonitor.register();
+        }
+    }
+
+    public void unregisterUSB() {
+        if (mUSBMonitor != null) {
+            mUSBMonitor.unregister();
+        }
+    }
+
+    public boolean checkSupportFlag(final int flag) {
+        return mCameraHandler != null && mCameraHandler.checkSupportFlag(flag);
+    }
+
+    public int getModelValue(final int flag) {
+        return mCameraHandler != null ? mCameraHandler.getValue(flag) : 0;
+    }
+
+    public int setModelValue(final int flag, final int value) {
+        return mCameraHandler != null ? mCameraHandler.setValue(flag, value) : 0;
+    }
+
+    public int resetModelValue(final int flag) {
+        return mCameraHandler != null ? mCameraHandler.resetValue(flag) : 0;
+    }
+
+    public void requestPermission(int index) {
+        List<UsbDevice> devList = getUsbDeviceList();
+        if (devList == null || devList.size() == 0) {
+            return;
+        }
+        int count = devList.size();
+        if (index >= count)
+            new IllegalArgumentException("index illegal,should be < devList.size()");
+        if (mUSBMonitor != null) {
+            mUSBMonitor.requestPermission(getUsbDeviceList().get(index));
+        }
+    }
+
+    public int getUsbDeviceCount() {
+        List<UsbDevice> devList = getUsbDeviceList();
+        if (devList == null || devList.size() == 0) {
+            return 0;
+        }
+        return devList.size();
+    }
+
+    public List<UsbDevice> getUsbDeviceList() {
+        List<DeviceFilter> deviceFilters = DeviceFilter
+                .getDeviceFilters(mActivityWrf.get().getApplicationContext(), R.xml.device_filter);
+        if (mUSBMonitor == null || deviceFilters == null)
+            return null;
+        return mUSBMonitor.getDeviceList(deviceFilters.get(0));
+    }
+
+    public void capturePicture(String savePath, AbstractUVCCameraHandler.OnCaptureListener listener) {
+        if (mCameraHandler != null && mCameraHandler.isOpened()) {
+            mCameraHandler.captureStill(savePath, listener);
+        }
+    }
+
+    public void startRecording(RecordParams params, AbstractUVCCameraHandler.OnEncodeResultListener listener) {
+        if (mCameraHandler != null && !isRecording()) {
+            mCameraHandler.startRecording(params, listener);
+        }
+    }
+
+    public void stopRecording() {
+        if (mCameraHandler != null && isRecording()) {
+            mCameraHandler.stopRecording();
+        }
+    }
+
+    public boolean isRecording() {
+        if (mCameraHandler != null) {
+            return mCameraHandler.isRecording();
+        }
+        return false;
+    }
+
+    public boolean isCameraOpened() {
+        if (mCameraHandler != null) {
+            return mCameraHandler.isOpened();
+        }
+        return false;
+    }
+
+    public void release() {
+        mCamViewWrf.clear();
+        mActivityWrf.clear();
+        if (mCameraHandler != null) {
+            mCameraHandler.release();
+            mCameraHandler = null;
+        }
+        if (mUSBMonitor != null) {
+            mUSBMonitor.destroy();
+            mUSBMonitor = null;
+        }
+    }
+
+    public USBMonitor getUSBMonitor() {
+        return mUSBMonitor;
+    }
+
+    private void openCamera(USBMonitor.UsbControlBlock ctrlBlock) {
+        if (mCameraHandler != null) {
+            mCameraHandler.open(ctrlBlock);
+        }
+    }
+
+    public void startPreview(CameraViewInterface cameraView, AbstractUVCCameraHandler.OnPreViewResultListener mPreviewListener) {
+        SurfaceTexture st = cameraView.getSurfaceTexture();
+        if (mCameraHandler != null) {
+            mCameraHandler.startPreview(st, mPreviewListener);
+        }
+    }
+
+    public void stopPreview() {
+        if (mCameraHandler != null) {
+            mCameraHandler.stopPreview();
+        }
+    }
+
+    public void startCameraFoucs() {
+        if (mCameraHandler != null) {
+            mCameraHandler.startCameraFoucs();
+        }
+    }
+
+    public List<Size> getSupportedPreviewSizes() {
+        if (mCameraHandler == null)
+            return null;
+        return mCameraHandler.getSupportedPreviewSizes();
+    }
+}