SurfaceView 试用

来源：互联网发布：服装生产软件编辑：程序博客网时间：2024/05/22 00:38

由于项目需要用到动画效果，如果大量绘制animation，则性能不佳，上网搜了，有surfaceview这个东西（不占用主线程）。因此自己学习了一下，以下demo是实现每个一秒钟绘制显示不同颜色的笑脸。
涉及点：SurfaceView、SurfaceHolder。

一、实现效果：

这里写图片描述

二、自定义surfaceview类
1、：
继承SurfaceView,实现SurfaceHolder Callback接口。

2、重写构造方法

3、实现三个callback方法：

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

三、整体代码：

public class MySurfaceViewTest extends SurfaceView implements SurfaceHolder.Callback{    private SurfaceHolder mSurfaceHolder;    private MyThread mMyThread;    private boolean isDraw = false;    public MySurfaceViewTest(Context context) {        super(context);        mSurfaceHolder = this.getHolder();        mSurfaceHolder.addCallback(this);        mMyThread = new MyThread();    }    private class MyThread extends Thread {        @Override        public void run() {            while (isDraw) {                try {                    sleep(1000);//睡一秒钟                    drawUI();                } catch (Exception e) {                }            }            super.run();        }    }    private void drawUI() {        Canvas canvas = null;        try {            canvas = mSurfaceHolder.lockCanvas();            synchronized (mSurfaceHolder) {                drawCanvas(canvas);            }        } finally {            if (canvas != null) {                mSurfaceHolder.unlockCanvasAndPost(canvas);            }        }    }    private void drawCanvas(Canvas canvas) {        // 在 canvas 上绘制需要的图形        if (canvas != null) {            Log.d("weiwei","come-----------------------------------------------");            canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR); // 清空界面            Paint p = new Paint();            p.setColor(CircleTextImageUtil.getRandomColor());// 设置随机颜色//            //画笑脸弧线            p.setStyle(Paint.Style.STROKE);//设置空心            RectF oval1=new RectF(150,20,180,40);            canvas.drawArc(oval1, 180, 180, false, p);//小弧形            oval1.set(190, 20, 220, 40);            canvas.drawArc(oval1, 180, 180, false, p);//小弧形            oval1.set(160, 30, 210, 60);            canvas.drawArc(oval1, 0, 180, false, p);//小弧形        }    }    static class  CircleTextImageUtil {        /**         * Get the random color.         *         * @return         */        private static int getRandomColor() {            List<Integer> colorList = new ArrayList<Integer>();            colorList.add(Color.RED);            colorList.add(Color.BLUE);            colorList.add(Color.GREEN);            colorList.add(Color.WHITE);            colorList.add(Color.YELLOW);            colorList.add(Color.GRAY);            return colorList.get((int) (Math.random() * colorList.size()));        }    }    @Override    public void surfaceCreated(SurfaceHolder holder) {        isDraw = true;        mMyThread.start();    }    @Override    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {    }    @Override    public void surfaceDestroyed(SurfaceHolder holder) {        isDraw = false;    }}

引用：

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        CrashReport.initCrashReport(getApplicationContext(), "077d3ebb59", false);        MySurfaceViewTest mySurfaceViewTest = new MySurfaceViewTest(this);//        setContentView(R.layout.activity_main);        setContentView(mySurfaceViewTest);    }}

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