SurfaceView初探

来源：互联网发布：三菱fx3u编程手册编辑：程序博客网时间：2024/05/18 02:38

用处就是绘画

1、在布局文件中定义一个SurfaceView。

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <LinearLayout         android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:gravity="center_horizontal" >        <Button             android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="开始绘画"            android:id="@+id/btn_paint"/>    </LinearLayout><SurfaceView     android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:id="@+id/sf_view"    android:layout_gravity="center"/></LinearLayout>

2、获取SerfaceView对象，然后通过getHolder，就获取了操作对象。

private void initView(){btn_paint = (Button)this.findViewById(R.id.btn_paint);surface = (SurfaceView) this.findViewById(R.id.sf_view);holder = surface.getHolder();}

3、给surfaceHolder添加监听事件。

holder.addCallback(this);

4、重写Callback接口中的方法

@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// TODO Auto-generated method stub}@Overridepublic void surfaceCreated(SurfaceHolder holder) {new Thread(new PaintLine()).start();}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stub}class PaintLine implements Runnable{@Overridepublic void run() {Canvas canvas = holder.lockCanvas(null);Paint paint = new Paint();paint.setColor(Color.BLUE);//for(int x= width / 2;x< width;x++)//canvas.drawPoint(x, x*x, paint);canvas.drawRect(new Rect(0,0,80,80), paint);holder.unlockCanvasAndPost(canvas);}}

0 0