Android中创建类似Instagram的渐变背景效果

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LinearLayout cOntainer= (LinearLayout) findViewById(R.id.container);
AnimationDrawable anim = (AnimationDrawable) container.getBackground();
anim.setEnterFadeDuration(6000);
anim.setExitFadeDuration(2000);

// 开始播放动画：在onResume方法中开始播放渐变动画
@Override
protected void onResume() {
  super.onResume();
  if (anim != null && !anim.isRunning())
    anim.start();
}
   
// 停止播放动画：在onPause方法中停止播放渐变动画
@Override
protected void onPause() {
  super.onPause();
  if (anim != null && anim.isRunning())
    anim.stop();
}

public class MainActivity extends AppCompatActivity { 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState);  
    // 加入下面的代码
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
      findViewById(android.R.id.content).setSystemUiVisibility( 
          View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE); 
    } 
 
    setContentView(R.layout.activity_splash); 
  } 
}