11_SurfaceView绘图

　　学习SurfaceView绘图API的使用方法，为接下来使用SurfaceView开发游戏做准备。

 1 package com.example.surfaceview;
 2
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5
 6 public class MainActivity extends Activity {
 7
 8     @Override
 9     protected void onCreate(Bundle savedInstanceState) {
10         super.onCreate(savedInstanceState);
11         setContentView(new MyView(this));
12
13     }
14
15 }

MainActivity

 1 package com.example.surfaceview;
 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.SurfaceView;
 9
10 public class MyView extends SurfaceView implements SurfaceHolder.Callback {
11
12     private Paint paint = null;
13
14     public MyView(Context context) {
15         super(context);
16         paint = new Paint();
17         paint.setColor(Color.RED);
18         getHolder().addCallback(this);
19     }
20
21     // 一定要锁定画布和解锁画布
22     public void draw() {
23         Canvas canvas = getHolder().lockCanvas();
24         canvas.drawColor(Color.WHITE);
25         canvas.drawRect(0, 0, 100, 100, paint);
26
27         getHolder().unlockCanvasAndPost(canvas);
28
29     }
30
31     @Override
32     public void surfaceCreated(SurfaceHolder holder) {
33         draw();
34     }
35
36     @Override
37     public void surfaceChanged(SurfaceHolder holder, int format, int width,
38             int height) {
39         // TODO Auto-generated method stub
40
41     }
42
43     @Override
44     public void surfaceDestroyed(SurfaceHolder holder) {
45         // TODO Auto-generated method stub
46
47     }
48
49 }

MyView