Android在SurfaceView绘图

MainActivity

 1 package com.example.surfacedemo; 2  3 import android.os.Bundle; 4 import android.app.Activity; 5 import android.view.Menu; 6  7 public class MainActivity extends Activity { 8  9     @Override10     public void onCreate(Bundle savedInstanceState) {11         super.onCreate(savedInstanceState);12         setContentView(new MyView(this)); //设置显示MyView实例13     }14 15     @Override16     public boolean onCreateOptionsMenu(Menu menu) {17         getMenuInflater().inflate(R.menu.activity_main, menu);18         return true;19     }    20 }

MyView

 1 package com.example.surfacedemo; 2  3 import android.content.Context; 4 import android.graphics.Canvas; 5 import android.graphics.Color; 6 import android.graphics.Paint; 7 import android.view.SurfaceHolder; 8 import android.view.SurfaceHolder.Callback; 9 import android.view.SurfaceView;10 11 public class MyView extends SurfaceView {12     13     SurfaceHolder sh;14 15     public MyView(Context context) {16         super(context);17         sh = getHolder();//得到Holder18         sh.addCallback(new Callback() {//创建回调19             20             public void surfaceDestroyed(SurfaceHolder holder) {//界面销毁时执行21                 22             }23             24             public void surfaceCreated(SurfaceHolder holder) {//界面创建后执行25                 Canvas canvas = sh.lockCanvas();26                 Paint paint=new Paint();27                 paint.setColor(Color.BLUE);28                 canvas.drawCircle(100,100, 20, paint);29                 sh.unlockCanvasAndPost(canvas);30             }31             32             public void surfaceChanged(SurfaceHolder holder, int format, int width,33                     int height) {//界面改变时执行34                 35             }36         });37     }38 39 }

转载于:https://www.cnblogs.com/hzy3774/archive/2012/07/13/2590940.html

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