MainActivity.java 文件源码

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // We could have set this in xml by setting android:animateLayoutChanges="true" but it's nice to make it
    // obvious that we're doing it.
    ViewGroup contentView = (ViewGroup) findViewById(R.id.content_view);
    contentView.setLayoutTransition(new LayoutTransition());

    mDummyView = findViewById(R.id.dummy_view);
    mImageView = (LayoutTransitioningImageView) findViewById(R.id.image_view);

    // Default to true. The associated menu toggle is checked.
    mImageView.setShouldSetFrameOnSizeChanged(true);
}