使用SurfaceView的一个例子

本程序参考http://rayleung.javaeye.com/blog/420410部分内容自己修改

下面代码用以演示使用SurfaceView

package com.demo;
/*
 * SurfaceView的示例程序
 * 演示其流程
 */
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;

public class MainActivity extends Activity {
    
    private int x=0, y=0, xoff = 10, yoff = 10, nWidth, nHeight;
    private String wellcome = "你好!中国";
    private float strWidth=0, strHeight=0;
    Paint mPaint = new Paint();
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        DisplayMetrics dm = new DisplayMetrics();
        getWindow().getWindowManager().getDefaultDisplay().getMetrics(dm);
        nWidth = dm.widthPixels;
        nHeight = dm.heightPixels;
        mPaint.setTextSize(18);
        float[] fw = new float[wellcome.length()];
        mPaint.getTextWidths(wellcome, fw);
        for(int i=0; i< fw.length; i++)
        {
            strWidth += fw[i];
        }
        strHeight = 18;
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN , WindowManager.LayoutParams. FLAG_FULLSCREEN);
        setContentView(new MyView(this));
    }
    
    //内部类
    class MyView extends SurfaceView implements SurfaceHolder.Callback
    {

        SurfaceHolder holder;
        public MyView(Context context) {
            super(context);
            holder = this.getHolder();//获取holder
            holder.addCallback(this);
            //setFocusable(true);
            
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width,
                int height) {
            
        }

        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            new Thread(new MyThread()).start();
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            
        }
        
        //内部类的内部类
        class MyThread implements Runnable{

            @Override
            public void run() {
                while(true)
                {
                    Canvas canvas = holder.lockCanvas(null);//获取画布
                    mPaint.setColor(Color.BLACK);
                    canvas.drawRect(new RectF(0,0,320,480), mPaint);
                    mPaint.setColor(Color.RED);
                    canvas.drawText("你好!中国", x, y+9, mPaint);
                    holder.unlockCanvasAndPost(canvas);//解锁画布，提交画好的图像
                    x += xoff;
                    y += yoff;
                    if(x+strWidth>nWidth || x<0)
                    {
                        xoff = -xoff;
                    }
                    if(y+strHeight>nHeight || y<0)
                    {
                        yoff = -yoff;
                    }
                    try {
                        Thread.sleep(50);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }
            
        }
        
    }
}