Android SurfaceView的使用

SurfaceView在游戏开发中有着举足轻重的地位，它对于画面的控制有着更大的自由度（不像View要用handler来更新）

package com.Aina.Android;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

/**
 * com.Aina.Android Pro_SurfaceView
 * 
 * @author Aina.huang E-mail: [e-mail]
 * @version 创建时间：2010 Jun 9, 2010 11:22:35 AM 类说明
 */
public class MyView extends SurfaceView implements SurfaceHolder.Callback,
		Runnable {

	private SurfaceHolder holder;
	public static int x = 100, y = 100;

	public MyView(Context context) {
		super(context);
		Log.i("TAG", "MyView()");
		holder = this.getHolder();
		holder.addCallback(this);
	}

	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		Log.i("TAG", "surfaceChanged()");

	}

	public void surfaceCreated(SurfaceHolder holder) {
		new Thread(this).start();
		Log.i("TAG", "surfaceCreated()");
	}

	public void surfaceDestroyed(SurfaceHolder holder) {
		Log.i("TAG", "surfaceDestroyed()");

	}

	public void run() {
		try {
			while (!Thread.currentThread().isInterrupted()) {
				synchronized (holder) {
					this.onDraw();
				}
				Thread.sleep(100);
			}
		} catch (Exception ex) {
			ex.printStackTrace();
		}

	}

	public void onDraw() {
		Canvas canvas = holder.lockCanvas();
		Paint paint = new Paint();
		paint.setColor(Color.BLACK);
		Log.i("TAG", canvas.getWidth() + "|" + canvas.getHeight());
		canvas.drawRect(0, 0, canvas.getWidth(), canvas.getHeight(), paint);
		paint.setColor(Color.RED);
		paint.setAntiAlias(true);
		canvas.drawCircle(x, y, 30, paint);
//		canvas.drawRect(x, y, a, b, paint);
		holder.unlockCanvasAndPost(canvas);
	}
}

package com.Aina.Android;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;

public class Test_SurfaceView extends Activity {
    /** Called when the activity is first created. */
	private MyView mv;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mv = new MyView(this);
        setContentView(mv);
    }

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
        switch (keyCode) {   
        case KeyEvent.KEYCODE_DPAD_DOWN:// 向下   
                MyView.y += 5;   
            break;   
        case KeyEvent.KEYCODE_DPAD_UP:// 向上   
                MyView.y -= 5;   
            break;   
        case KeyEvent.KEYCODE_DPAD_LEFT:// 向左  
                MyView.x -= 5;   
            break;   
        case KeyEvent.KEYCODE_DPAD_RIGHT:// 向右   
                MyView.x += 5;   
            break;   
        default:   
            break;   
        } 
		return super.onKeyDown(keyCode, event);
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		int x = (int) event.getX();
		int y = (int) event.getY();
			MyView.x = x;
			MyView.y = y;
		
		return super.onTouchEvent(event);
	}
    
}