话不多说上图

实现简单利用了这个ClipDrawable

 

clip.xml 

activity_main.xml

MainActivity.java

package mdm.study.com.myresoucestudy;import android.graphics.drawable.ClipDrawable;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.widget.ImageView;import java.util.Timer;import java.util.TimerTask;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //徐徐展开的风景        ImageView imgClip = (ImageView) findViewById(R.id.imgclip);        final ClipDrawable clipDrawable = (ClipDrawable) imgClip.getDrawable();        final Handler handler = new Handler(){            @Override            public void handleMessage(Message msg) {                if(msg.what == 0x123){                    //clipDrawable值的范围0！ 10000                    clipDrawable.setLevel(clipDrawable.getLevel() + 50);                }            }        };        final Timer timer = new Timer();        timer.schedule(new TimerTask() {            @Override            public void run() {                Message msg = Message.obtain();                msg.what = 0x123;                handler.sendMessage(msg);                //取消定时器                if(clipDrawable.getLevel() >= 10000){                    timer.cancel();                }            }        },0,10);    }}

简单吧。