Android在SurfaceView做动画一般方法

MainActivity

package com.example.surfacemove;
 
 import android.os.Bundle;
 import android.app.Activity;
 import android.view.Menu;
 
 public class MainActivity extends Activity {
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(new MyView(this));//指定界面
     }
 
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         getMenuInflater().inflate(R.menu.activity_main, menu);
         return true;
     }
 
     
 }

 

MyView

package com.example.surfacemove;
 
 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Paint.Style;
 import android.view.SurfaceHolder;
 import android.view.SurfaceHolder.Callback;
 import android.view.SurfaceView;
 
 public class MyView extends SurfaceView implements Runnable, Callback {
 
     private Paint paint;
     private Canvas canvas;
     private boolean isRunning = true;//标志新线程是否运行
     private SurfaceHolder sh;
     private int i;
 
     public MyView(Context context) {
         super(context);
         paint = new Paint();
         paint.setStyle(Style.STROKE);
         paint.setColor(Color.GREEN);
         paint.setAntiAlias(true);
         sh = getHolder();//得到surfaceholder
         sh.addCallback(this);//添加回调
     }
 
     public void surfaceChanged(SurfaceHolder holder, int format, int width,
             int height) {//界面改变时调用
 
     }
 
     public void surfaceCreated(SurfaceHolder holder) {//界面创建后调用
         new Thread(this).start();//开启新线程
     }
 
     public void surfaceDestroyed(SurfaceHolder holder) {//界面销毁后调用
         isRunning = false;//标志位置为假
     }
 
     public void run() {//run函数
         while (isRunning) {//如果标志位为真
             i++;
             if(i==50){
                 i=0;
             }
             drawView();//画画面
             try {
                 Thread.sleep(100);//延时
             } catch (InterruptedException e) {
                 e.printStackTrace();
             }
         }
     }
 
     private void drawView() {//画画函数
         try {
             if(sh!=null){//若sh不为空
                 canvas = sh.lockCanvas();//得到canvas
                 canvas.drawColor(Color.BLACK);//清屏
                 canvas.drawCircle(100, 100, i, paint);
             }
         } catch (Exception e) {
             e.printStackTrace();
         }finally{
             if(canvas!=null){//若canvas不为空
                 sh.unlockCanvasAndPost(canvas);//解锁canvas
             }
         }
     }
 }