AndroidUSBCamera/app/src/main/java/com/jiangdg/usbcamera/view/BaseActivity.java

/*
 *  UVCCamera
 *  library and sample to access to UVC web camera on non-rooted Android device
 *
 * Copyright (c) 2014-2017 saki t_saki@serenegiant.com
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 *  All files in the folder are under this Apache License, Version 2.0.
 *  Files in the libjpeg-turbo, libusb, libuvc, rapidjson folder
 *  may have a different license, see the respective files.
 */

package com.jiangdg.usbcamera.view;

import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.support.annotation.NonNull;
import android.support.annotation.StringRes;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;

import com.serenegiant.dialog.MessageDialogFragment;
import com.serenegiant.utils.BuildCheck;
import com.serenegiant.utils.HandlerThreadHandler;
import com.serenegiant.utils.PermissionCheck;

/**
 * Created by saki on 2016/11/18.
 *
 */
public class BaseActivity extends AppCompatActivity {

	private static boolean DEBUG = false;
	private static final String TAG = BaseActivity.class.getSimpleName();

	// 处理UI的Handler
	private final Handler mUIHandler = new Handler(Looper.getMainLooper());
	private final Thread mUiThread = mUIHandler.getLooper().getThread();
	// 工作线程Handler
	private Handler mWorkerHandler;
	private long mWorkerThreadID = -1;

	@Override
	protected void onCreate(final Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// 创建工作线程
		if (mWorkerHandler == null) {
			mWorkerHandler = HandlerThreadHandler.createHandler(TAG);
			mWorkerThreadID = mWorkerHandler.getLooper().getThread().getId();
		}
	}

	@Override
	protected void onPause() {
		clearToast();
		super.onPause();
	}

	@Override
	protected synchronized void onDestroy() {
		// 释放线程资源
		if (mWorkerHandler != null) {
			try {
				mWorkerHandler.getLooper().quit();
			} catch (final Exception e) {
				//
			}
			mWorkerHandler = null;
		}
		super.onDestroy();
	}

//================================================================================
	/**
	 *
	 * 子线程中更新UI，duration为延迟多久执行
	 *
	 */
	public final void runOnUiThread(final Runnable task, final long duration) {
		if (task == null) return;
		mUIHandler.removeCallbacks(task);
		if ((duration > 0) || Thread.currentThread() != mUiThread) {
			mUIHandler.postDelayed(task, duration);
		} else {
			try {
				task.run();
			} catch (final Exception e) {
				Log.w(TAG, e);
			}
		}
	}

	/**
	 * 移除更新UI task
	 * @param task
	 */
	public final void removeFromUiThread(final Runnable task) {
		if (task == null) return;
		mUIHandler.removeCallbacks(task);
	}

	/**
	 * 工作子线程中执行的任务
	 */
	protected final synchronized void queueEvent(final Runnable task, final long delayMillis) {
		if ((task == null) || (mWorkerHandler == null)) return;
		try {
			mWorkerHandler.removeCallbacks(task);
			if (delayMillis > 0) {
				mWorkerHandler.postDelayed(task, delayMillis);
			} else if (mWorkerThreadID == Thread.currentThread().getId()) {
				task.run();
			} else {
				mWorkerHandler.post(task);
			}
		} catch (final Exception e) {
			// ignore
		}
	}

	protected final synchronized void removeEvent(final Runnable task) {
		if (task == null) return;
		try {
			mWorkerHandler.removeCallbacks(task);
		} catch (final Exception e) {
			// ignore
		}
	}

//================================================================================
	private Toast mToast;

	protected void showToast(@StringRes final int msg, final Object... args) {
		removeFromUiThread(mShowToastTask);
		mShowToastTask = new ShowToastTask(msg, args);
		runOnUiThread(mShowToastTask, 0);
	}


	protected void clearToast() {
		removeFromUiThread(mShowToastTask);
		mShowToastTask = null;
		try {
			if (mToast != null) {
				mToast.cancel();
				mToast = null;
			}
		} catch (final Exception e) {
			// ignore
		}
	}

	private ShowToastTask mShowToastTask;
	private final class ShowToastTask implements Runnable {
		final int msg;
		final Object args;
		private ShowToastTask(@StringRes final int msg, final Object... args) {
			this.msg = msg;
			this.args = args;
		}

		@Override
		public void run() {
			try {
				if (mToast != null) {
					mToast.cancel();
					mToast = null;
				}
				if (args != null) {
					final String _msg = getString(msg, args);
					mToast = Toast.makeText(BaseActivity.this, _msg, Toast.LENGTH_SHORT);
				} else {
					mToast = Toast.makeText(BaseActivity.this, msg, Toast.LENGTH_SHORT);
				}
				mToast.show();
			} catch (final Exception e) {
				// ignore
			}
		}
	}
}