<?xml version="1.0" encoding="utf-8"?>
<wallpaper xmlns:android="http://schemas.android.com/apk/res/android"
  android:thumbnail="@mipmap/heart" />

public class MainWallpaper extends WallpaperService {
  private static final String TAG = "MainWallpaper";
  @Override
  public Engine onCreateEngine() {
    return new MyEngine();
  }
  class MyEngine extends Engine implements Runnable{
    @Override
    public void onCreate(SurfaceHolder surfaceHolder) {
      super.onCreate(surfaceHolder);
      //這里初始化畫筆等
    }
     @Override
    public void onVisibilityChanged(boolean visible) {
      super.onVisibilityChanged(visible);
     //這里開始繪制
    }
  }

 <service android:label="@string/app_name"
android:name="com.demo.mylove.MainWallpaper"
android:permission="android.permission.BIND_WALLPAPER">
      <!-- 為實(shí)時(shí)壁紙配置intent-filter -->
      <intent-filter>
        <action android:name="android.service.wallpaper.WallpaperService" />
      </intent-filter>
      <!-- 為實(shí)時(shí)壁紙配置meta-data 沒錯(cuò)這里wallpaper是我們第一步創(chuàng)建的xml文件-->
      <meta-data android:name="android.service.wallpaper"
        android:resource="@xml/wallpaper" />
    </service>

 WindowManager wm= (WindowManager) getSystemService(WINDOW_SERVICE);
      Display display=wm.getDefaultDisplay();
      DisplayMetrics displayMetrics=new DisplayMetrics();
      display.getMetrics(displayMetrics);
      mWidth =displayMetrics.widthPixels;
      mHeight =displayMetrics.heightPixels;
//獲取SurfaceHolder
 mHolder=getSurfaceHolder();

 // 繪制方法
    private void drawFrame()
    {
        // 對(duì)畫布加鎖
        mCanvas = mHolder.lockCanvas();
        if (mCanvas != null)
        {
          mCanvas.save();
          // 繪制背景色
          mCanvas.drawColor(0xff000000);
          //mCanvas.drawBitmap(BitmapFactory.decodeResource(getResources(),R.mipmap.wall_background),null,mRectF,mPaint);
          drawClock();
          if (mCanvas != null)
            mHolder.unlockCanvasAndPost(mCanvas);
        }
    }
    private void drawClock(Canvas canvas){
      mCalendar = Calendar.getInstance();
      int second=mCalendar.get(Calendar.SECOND);
      int minute=mCalendar.get(Calendar.MINUTE);
      int hour=mCalendar.get(Calendar.HOUR);
      String time=hour+":"+minute+":"+second;
      mCanvas.save();
      //畫秒針及間隔
      mCanvas.translate(mWidth/2,mHeight/2);//平移畫布的中心位置
      float item;//外圈的分割線的長度
      for (int i = 0; i< CLOCK_COUNT; i++){//畫間隔
        mPaint.setColor(Color.RED);
        if(second==i){
          mPaint.setColor(Color.BLUE);
        }
        if (i%15==0){//整點(diǎn)的位置
          item=-radius+27; 
        }else if (i%5==0){//整點(diǎn)中間位置
          item=-radius+37;
        }else {//其他時(shí)間
          item=-radius+17;
        }
        mCanvas.drawLine(0,-radius,0,item,mPaint);
        mCanvas.rotate(CLOCK_ROTATE);
      }
      mCanvas.save();
      //畫分針
      mCanvas.rotate(minute* CLOCK_ROTATE +(CLOCK_ROTATE /60)*second);
      mCanvas.drawLine(0,0,0,-radius/2,mPaint);
      mCanvas.restore();
      mCanvas.save();
      //畫時(shí)針
      mCanvas.rotate(hour*(360/12)+minute/2);
      mCanvas.drawLine(0,0,0,-radius/3,mPaint);
      mCanvas.restore();
      mCanvas.save();
      //畫中心點(diǎn)
      mCanvas.drawCircle(0,0,20,mPaint);
      //畫時(shí)鐘顯示的時(shí)間
      mCanvas.getTextBounds(time,0,time.length(), mRect);
      mCanvas.drawText(time,-mRect.width()/2,radius+40,mPaint);
      mCanvas.getTextBounds(TWELVE,0,TWELVE.length(), mRect);
      //畫數(shù)字12
      mCanvas.drawText(TWELVE,-mRect.width()/2,-radius+60,mPaint);
      mCanvas.getTextBounds(NINE,0,NINE.length(), mRect);
      //畫數(shù)字3
      mCanvas.drawText(THREE,radius-60,mRect.height()/2,mPaint);
      //畫數(shù)字6
      mCanvas.drawText(SIX,-mRect.width()/2,radius-40,mPaint);
      //畫數(shù)字9
      mCanvas.drawText(NINE,-radius+40,mRect.height()/2,mPaint);
         }