package com.android777.demo.uicontroller.graphics;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
public class DemoSurfaceView extends SurfaceView implements Callback{
LoopThread thread;
public DemoSurfaceView(Context context) {
super(context);
init(); //初始化,設(shè)置生命周期回調(diào)方法
}
private void init(){
SurfaceHolder holder = getHolder();
holder.addCallback(this); //設(shè)置Surface生命周期回調(diào)
thread = new LoopThread(holder, getContext());
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
thread.isRunning = true;
thread.start();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
thread.isRunning = false;
try {
thread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
/**
* 執(zhí)行繪制的繪制線程
* @author Administrator
*
*/
class LoopThread extends Thread{
SurfaceHolder surfaceHolder;
Context context;
boolean isRunning;
float radius = 10f;
Paint paint;
public LoopThread(SurfaceHolder surfaceHolder,Context context){
this.surfaceHolder = surfaceHolder;
this.context = context;
isRunning = false;
paint = new Paint();
paint.setColor(Color.YELLOW);
paint.setStyle(Paint.Style.STROKE);
}
@Override
public void run() {
Canvas c = null;
while(isRunning){
try{
synchronized (surfaceHolder) {
c = surfaceHolder.lockCanvas(null);
doDraw(c);
//通過它來控制幀數(shù)執(zhí)行一次繪制后休息50ms
Thread.sleep(50);
}
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
surfaceHolder.unlockCanvasAndPost(c);
}
}
}
public void doDraw(Canvas c){
//這個很重要，清屏操作，清楚掉上次繪制的殘留圖像
c.drawColor(Color.BLACK);
c.translate(200, 200);
c.drawCircle(0,0, radius++, paint);
if(radius > 100){
radius = 10f;
}
}
}
}