RotateDrawable 用来对 Drawable 进行旋转，可以通过 setLevel() 来控制旋转的,最大值是 10000

RotateDrawable 属性

角度坐标系如下

范例

1. 创建一个 空的 Android 项目 cn.twle.android.RotateDrawable

2. 下载 /static/i/meimei_160x360.jpg 并把图片放到 res/drawable 目录

3. 创建一个 RotateDrawable 资源文件

   res/drawable/rotate_meimei.xml

   <?xml version="1.0" encoding="utf-8"?>
   <rotate xmlns:android="http://schemas.android.com/apk/res/android"
       android:drawable="@drawable/meimei_160x360"
       android:fromDegrees="-180"
       android:pivotX="50%"
       android:pivotY="50%" />
   

4. 修改 activity_main.xml 添加一个 ImageView

   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="match_parent"
       android:layout_height="match_parent">
   
       <ImageView 
           android:id="@+id/img_show"
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           android:scaleType="center"
           android:src="@drawable/rotate_meimei" />
   
   </LinearLayout>
   

5. 修改 MainActivity.java

   package cn.twle.android.rotatedrawable;
   
   import android.graphics.drawable.RotateDrawable;
   import android.os.Handler;
   import android.os.Message;
   import android.support.v7.app.AppCompatActivity;
   import android.os.Bundle;
   import android.widget.ImageView;
   import android.widget.Toast;
   
   import java.util.Timer;
   import java.util.TimerTask;
   
   public class MainActivity extends AppCompatActivity {
   
       private ImageView img_show;
       private RotateDrawable cd;
       private Handler handler = new Handler() {
           @Override
           public void handleMessage(Message msg) {
               if (msg.what == 0x123) {
                   if (cd.getLevel() >= 10000)
                       Toast.makeText(MainActivity.this, "转完了~",
                               Toast.LENGTH_LONG).show();
                   cd.setLevel(cd.getLevel() + 400);
               }
           }
       };
   
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
           img_show = (ImageView) findViewById(R.id.img_show);
           // 核心实现代码
           cd = (RotateDrawable) img_show.getDrawable();
           final Timer timer = new Timer();
           timer.schedule(new TimerTask() {
               @Override
               public void run() {
                   handler.sendEmptyMessage(0x123);
                   if (cd.getLevel() >= 10000) {
                       timer.cancel();
                   }
               }
           }, 0, 100);
       }
   }