Android中SurfaceView用法示例

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，关于View的），但这方面的参考资料并不是太多，能找到的例子都有点喧宾夺主的感觉，不能把使用的流程清晰展示出来，下面是个简单的示例，力求把流程清楚展示，其他的可简则简。

程序效果——1：用线程画一个蓝色的长方形。

JAVA代码

package com.hyzhou.surfaceviewdemo;

import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new MyView(this));
    }

    private  class MyView extends SurfaceView implements SurfaceHolder.Callback
    {

        /**
         * @param context
         */
        SurfaceHolder holder;
        public MyView(Context context) {
            super(context);
            // TODO Auto-generated constructor stub
            holder=this.getHolder();
            holder.addCallback(this);
        }
        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width,
                int height) {
            // TODO Auto-generated method stub

        }
        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            // TODO Auto-generated method stub
            new Thread(new MyThread()).start();
        }
        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            // TODO Auto-generated method stub

        }
        class MyThread implements Runnable
        {

            /* (non-Javadoc)
             * @see java.lang.Runnable#run()
             */
            @Override
            public void run() {
                // TODO Auto-generated method stub
                Canvas canvas = holder.lockCanvas(null);//获取画布
                                Paint mPaint = new Paint();
                                mPaint.setColor(Color.BLUE);  

                                canvas.drawRect(new RectF(40,60,80,80), mPaint); //前2个参数代表右上角坐标，后2个参数代表右下角坐标
                                holder.unlockCanvasAndPost(canvas);//解锁画布，提交画好的图像  

            }

        }

    }

}