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以前觉得java让人觉得有趣的一个特点是支持：匿名内部类，而最近发现jdk8已支持lambda并有更简便的方式，来实现匿名内部类. 这会让程序员更舒服，更喜欢java. 多年前觉得java语法和C#语法差得有点远，没有C#那么写来方便，现在觉得jdk8也很不错了。做技术还是要向前看。
final TextView txtView2 = (TextView)this.findViewById(R.id.txtView2); Button btnChangeView = (Button)findViewById(R.id.btnChangeText); btnChangeView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { txtView2.setText("Text 改变"); } });
新的实现方式：
final TextView txtView2 = (TextView)this.findViewById(R.id.txtView2); Button btnChangeView = (Button)findViewById(R.id.btnChangeText); //btnChangeView.setOnClickListener(e -> Log.i("MyTag", "Button Clicked.") ); assert btnChangeView != null; btnChangeView.setOnClickListener((view) -> { Log.i(TAG, "btnChangeView Clicked:" + view.getId()); txtView2.setText("Text 改变:" + new Date().toString()); });
参考：
http://stackoverflow.com/questions/37004069/errorjack-is-required-to-support-java-8-language-features
http://www.jianshu.com/p/5fc2b3362702
需要更改配置: build.gradle
defaultConfig {
...
jackOptions {
enabled true
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}apply plugin: ‘com.android.application‘ android { compileSdkVersion 23 buildToolsVersion "24.0.2" defaultConfig { applicationId "com.firstapp.test.firstapp" minSdkVersion 16 targetSdkVersion 23 versionCode 1 versionName "1.0" jackOptions { enabled true } } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile(‘proguard-android.txt‘), ‘proguard-rules.pro‘ } } compileOptions { sourceCompatibility 1.8 targetCompatibility 1.8 } } dependencies { compile fileTree(include: [‘*.jar‘], dir: ‘libs‘) testCompile ‘junit:junit:4.12‘ compile ‘com.android.support:appcompat-v7:23.4.0‘ }
jdk 8 lambda表达式 及在Android Studio的使用示例
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原文地址：http://www.cnblogs.com/wucg/p/5815956.html
