upgrade SDK version to 27 and common lib to 2.12.4

app/build.gradle

@@ -1,14 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 25
+    compileSdkVersion rootProject.ext.versionCompiler
-    buildToolsVersion '26.0.2'
     defaultConfig {
         applicationId "com.jiangdg.usbcamera"
-        minSdkVersion 16
+        minSdkVersion rootProject.ext.minSdkVersion
-        targetSdkVersion 22
+        targetSdkVersion rootProject.ext.versionTarget
         versionCode 1
-        versionName "1.0"
+        versionName rootProject.ext.versionNameString
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -17,16 +16,22 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    // solving com.android.tools.r8.CompilationFailedException: Compilation failed to complete
+    compileOptions {
+        sourceCompatibility rootProject.ext.javaSourceCompatibility
+        targetCompatibility rootProject.ext.javaTargetCompatibility
+    }
 }
 
 dependencies {
-    compile fileTree(include: ['*.jar'], dir: 'libs')
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
-    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    compile 'com.android.support:appcompat-v7:25.3.1'
+    implementation "com.android.support:appcompat-v7:${supportLibVersion}"
-    testCompile 'junit:junit:4.12'
+    implementation "com.android.support:support-annotations:${supportLibVersion}"
-    compile project(':libusbcamera')
+    testImplementation 'junit:junit:4.12'
-    compile 'com.jakewharton:butterknife:8.8.1'
+    implementation 'com.jakewharton:butterknife:8.8.1'
     annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
+    implementation project(':libusbcamera')
 }

build.gradle

@@ -6,7 +6,7 @@ buildscript {
     }
     dependencies {
         // gradle插件版本
-        classpath 'com.android.tools.build:gradle:3.0.0'
+        classpath 'com.android.tools.build:gradle:3.2.1'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:2.0'
     }
 }
@@ -24,12 +24,12 @@ task clean(type: Delete) {
 }
 
 ext {
-    supportLibVersion = '25.3.1'  // variable that can be referenced to keep support libs consistent
+    supportLibVersion = '27.1.1'  // variable that can be referenced to keep support libs consistent
-    commonLibVersion= '1.5.20'
+    commonLibVersion= '2.12.4'
-    //versionBuildTool = '26.0.2'
+    versionCompiler = 27
-    //versionCompiler = 25
+    versionTarget = 27
-    //versionTarget = 22
+    minSdkVersion = 21
-    //versionNameString = '1.0.0'
+    versionNameString = '1.0.0'
-    javaSourceCompatibility = JavaVersion.VERSION_1_7
+    javaSourceCompatibility = JavaVersion.VERSION_1_8
-    javaTargetCompatibility = JavaVersion.VERSION_1_7
+    javaTargetCompatibility = JavaVersion.VERSION_1_8
 }

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip

libusbcamera/build.gradle

@@ -3,15 +3,12 @@ apply plugin: 'com.github.dcendents.android-maven'
 group='com.github.jiangdongguo'
 
 android {
-    compileSdkVersion 25
+    compileSdkVersion rootProject.ext.versionCompiler
-    buildToolsVersion '26.0.2'
-
     defaultConfig {
-        minSdkVersion 16
+        minSdkVersion rootProject.ext.minSdkVersion
-        targetSdkVersion 22
+        targetSdkVersion rootProject.ext.versionTarget
         versionCode 1
-        versionName "1.0"
+        versionName rootProject.ext.versionNameString
-
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -20,17 +17,25 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    // solving com.android.tools.r8.CompilationFailedException: Compilation failed to complete
+    compileOptions {
+        sourceCompatibility rootProject.ext.javaSourceCompatibility
+        targetCompatibility rootProject.ext.javaTargetCompatibility
+    }
 }
 
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
+    implementation fileTree(dir: new File(buildDir, 'libs'), include: '*.jar')
-    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    compile 'com.android.support:appcompat-v7:25.3.1'
+    testImplementation 'junit:junit:4.12'
-    testCompile 'junit:junit:4.12'
+    implementation "com.android.support:appcompat-v7:${supportLibVersion}"
-    compile("com.serenegiant:common:${commonLibVersion}") {
+    implementation "com.android.support:support-annotations:${supportLibVersion}"
+    // when changing compile to implementation
+    // AS will report exception of com.serenegiant.widget.IAspectRatioView
+    api("com.serenegiant:common:${commonLibVersion}") {
         exclude module: 'support-v4'
     }
 }