package com.example.tangzh.MyView;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;import com.example.tangzh.mylearn.R;/*** Created by TangZH on 2017/4/30.*/
public class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback,Runnable //继承并实现两个接口
{private SurfaceHolder mHolder;//用于绘图的Canvasprivate Canvas mCanvas;//子线程标志位private boolean mIsDrawing;//画笔private Paint mPaint;private Path mPath;//x坐标private int x=0;//y坐标private int y=400;public MySurfaceView(Context context, AttributeSet attrs, int defStyleAttr){super(context, attrs, defStyleAttr);initView();}public MySurfaceView(Context context){super(context);initView();}public MySurfaceView(Context context, AttributeSet attrs){super(context, attrs);initView();}private void initView(){mHolder=getHolder();mHolder.addCallback(this);setFocusable(true);setFocusableInTouchMode(true);this.setKeepScreenOn(true);}@Overridepublic void surfaceCreated(SurfaceHolder surfaceHolder) {mIsDrawing=true;mPath=new Path();mPath.moveTo(0,400);mPaint=new Paint();mPaint.setColor(getResources().getColor(R.color.colorTheme));mPaint.setStyle(Paint.Style.STROKE);mPaint.setStrokeWidth(5);new Thread(this).start();}@Overridepublic void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {}@Overridepublic void surfaceDestroyed(SurfaceHolder surfaceHolder) {mIsDrawing=false;}@Overridepublic void run() {while (mIsDrawing){draw();x+=5;y=(int)(100* Math.sin(x*2*Math.PI/180)+400);mPath.lineTo(x,y);}}private void draw() {try {mCanvas=mHolder.lockCanvas();//SurfaceView背景
            mCanvas.drawColor(Color.WHITE);mCanvas.drawPath(mPath,mPaint);}catch (Exception e){e.printStackTrace();}finally {if(mCanvas!=null)mHolder.unlockCanvasAndPost(mCanvas); //对画布内容进行提交
        }}
}