MainActivity.java 文件源码

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

    findViewById(R.id.tv_transition).setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            TransitionDrawable drawable = (TransitionDrawable) v.getBackground();
            drawable.startTransition(3000);
        }
    });

    ScaleDrawable scaleDrawable = (ScaleDrawable) findViewById(R.id.v_scale).getBackground();
    scaleDrawable.setLevel(10);      //lever默认为0，无法显示。level范围为0~10000。level越大，显示的越大

    ClipDrawable clipDrawable = (ClipDrawable) findViewById(R.id.v_clip).getBackground();
    clipDrawable.setLevel(5000);

    View vCustom = findViewById(R.id.v_custom);
    CustomDrawable customDrawable = new CustomDrawable(getResources().getColor(R.color.colorAccent));
    vCustom.setBackground(customDrawable);
}