Android开发之5.0activity跳转时共享元素的使用方法

<ImageView
    android:id="@+id/item_image"
    android:layout_width="100dp"
    android:layout_height="140dp"
    android:layout_margin="10dp"
    android:transitionName="transitionImg"
    android:src="@mipmap/qq"
    / 

 @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    iv= (ImageView) findViewById(R.id.item_image);
  }
  public void click(View view)
  {
    if (android.os.Build.VERSION.SDK_INT   20) {
      intent = new Intent(this,HomeActivity.class);
      startActivity(intent, ActivityOptions.makeSceneTransitionAnimation(MainActivity.this, iv, "transitionImg").toBundle());
    } else {
      startActivity(intent);
    }
  }