实现图片缓慢展开功能

//要用到clipdrawble，xml功能如下，在drawble目录下新建，类型选择为clip（注意AS不会提示）<?xml version="1.0" encoding="utf-8"?>
<clip xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/a"
    android:clipOrientation="horizontal"
    android:gravity="center">
</clip>

//IMG的XML

<ImageView    android:id="@+id/img"    android:src="@drawable/clip"    android:layout_width="wrap_content"    android:layout_height="wrap_content" />

//JAVA代码如下

import android.graphics.drawable.ClipDrawable;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {    private ImageView img;    private ClipDrawable clip;    private MyHandler handler;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        init();    }

    private void init() {        img = (ImageView) findViewById(R.id.img);        clip=(ClipDrawable) img.getDrawable();        handler=new MyHandler();        MyThread thread=new MyThread();        new Thread(thread).start();

    }    private class MyThread implements Runnable{

    @Override    public void run() {        while(true){            try {                Message msg=handler.obtainMessage();                msg.what=0x123;                msg.sendToTarget();                Thread.sleep(1000);            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }}    private class MyHandler extends Handler{        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            if(msg.what==0x123){                clip.setLevel(clip.getLevel()+100);            }        }    }}