从零开始学android -- CilpDrawable 徐徐展开的风景

话不多说上图

实现简单利用了这个ClipDrawable

clip.xml 

<?xml version="1.0" encoding="utf-8"?>
<clip xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/ic"
    android:clipOrientation="horizontal"
    android:gravity="left">

activity_main.xml

<ImageView
        android:id="@+id/imgclip"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:src="@drawable/clip"/>

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。