【Android】SurfaceView中使用线程绘制图形

package com.example.surfaceviewthread;

/*
* 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.view.SurfaceHolder;
import android.view.SurfaceView;

public class MainActivity extends Activity {

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
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() {
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);
holder.unlockCanvasAndPost(canvas);//解锁画布，提交画好的图像
}
}
}
}