Callback 有三个回调函数,如下: SurfaceHolder.Callback { @Override public void surfaceCreated(SurfaceHolder...int height) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { } } surfaceCreated...一般,会在surfaceCreated中给MediaPlayer设置surfaceHolder。...@Override public void surfaceCreated(SurfaceHolder holder) { player.setDisplay(holder);...} } private class MyCallBack implements SurfaceHolder.Callback { @Override public void surfaceCreated
然后我们再继承SurfaceHolder.Callback 这个接口 ,这样我们的GameCanvas类要实现其几个方法 1 public void surfaceCreated(SurfaceHolder...holder) {} 3 public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {} 我们在surfaceCreated...暂且先不讨论它,后面你会明白他有什么用了, 声明一个SurfaceHolder handle对象,然后在surfaceCreated()方法里面初始化它 如下: handle = this.getHolder...paint.setColor(Cloor.red); canvas.drawText("Andoid GameCanvas",100,100,paint); } @Override public void surfaceCreated
image.png 在FlutterSurfaceView中,这个类继承至SurfaceView,实现了RenderSurface接口,在通过调用FlutterRenderer的surfaceCreated...方法,最终会调用到flutterJNI的surfaceCreated,最终通过调用nativeSurfaceCreated方法和nativePlatformViewId产生了关联,以下是源码部分。...= null) { this.flutterRenderer.surfaceCreated(this.getHolder().getSurface()); } else...方法 public void surfaceCreated(@NonNull Surface surface) { this.flutterJNI.onSurfaceCreated(surface...NonNull SurfaceHolder holder) { Log.v("FlutterSurfaceView", "SurfaceHolder.Callback.surfaceCreated
如果你要查看 surface被创建和销毁的时机,可以重载surfaceCreated(SurfaceHolder)和 surfaceDestroyed(SurfaceHolder)。...2> 由于surface可能被销毁,它只在SurfaceHolder.Callback.surfaceCreated()和 SurfaceHolder.Callback.surfaceDestroyed...the one running its [SurfaceView], you will want to carefully read the [lockCanvas()] and [Callback.surfaceCreated
int width, int height) { // TODO Auto-generated method stub } @Override public void surfaceCreated...int width, int height) { // TODO Auto-generated method stub } @Override public void surfaceCreated...在surfaceCreated方法中调用处理绘图线程,并将holder对象传递给绘图线程 4.
重写方法:surfaceChanged:surface大小或格式发生变化时触发,在surfaceCreated调用后该函数至少会被调用一次。...surfaceCreated:Surface创建时触发,一般在这个函数开启绘图线程(新的线程,不要再这个线程中绘制Surface)。...SurfaceHolder SurfaceHolder回调自己的三个生命周期: surfaceCreated(SurfaceHolder holder)创建时 surfaceChanged(SurfaceHolder...View.OnClickListener() { @Override public void onClick(View v) { mediaPlayer.pause(); } }); } @Override public void surfaceCreated...e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } @Override public void surfaceCreated
解决方案二: What probably happened is that you created a thread in the surfaceCreated...public void surfaceCreated(SurfaceHolder holder) { if (_thread == null || _thread.getState() == Thread.State.TERMINATED
Runnable接口,需要重写以下方法 /** * SurfaceView创建 * @param holder */ @Override public void surfaceCreated...绘制的时候,充分利用SurfaceView的三个回调方法,在surfaceCreated方法中开启子线程进行绘制, 而子线程使用一个while(mIsDrawing)的循环来不停的绘制,并通过unlockCanvasAndPost...} /** * SurfaceView创建 * * @param holder */ @Override public void surfaceCreated...设置转弯处为圆角 mPaint.setStrokeJoin(Paint.Join.ROUND);//结合处为圆角 } @Override public void surfaceCreated...} /** * SurfaceView创建 * * @param holder */ @Override public void surfaceCreated
SurfaceView 声明周期对应 : SurfaceView 可见的时候 Surface 被创建, SurfaceView 不可见时 Surface 销毁, Surface 创建销毁时机回调方法 SurfaceCreated...(SurfaceHolder arg0) { System.out.println("SurfaceHolder.Callback.surfaceCreated : Surface 开始创建");...Callback 接口对应的 Surface 边界 : surfaceCreated() 方法在开始绘制时回调, surfaceDestroyed() 在 Surface 销毁前回调; * 3....该接口中的方法 : * -- surfaceChanged() : 在 Surface 大小改变时回调; * -- surfaceCreated() : 在 Surface 创建时回调...(SurfaceHolder arg0) { System.out.println("SurfaceHolder.Callback.surfaceCreated : Surface 开始创建");
把画布显示在屏幕上 } /** * 当SurfaceView创建的时候,调用此函数 */ @Override public void surfaceCreated...} } } MySurfaceView首先继承SurfaceView,然后实现Runnable和Callback接口 重写了Runnable的run方法和Callback的surfaceCreated
surfaceChanged(SurfaceHolder holder,int format,int width,int height){} //在surface的大小发生改变时激发 public void surfaceCreated..., int height) { // TODO Auto-generated method stub } @Override public void surfaceCreated
int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); } @Override public void surfaceCreated...int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); } @Override public void surfaceCreated
@Override public void surfaceCreated(SurfaceHolder holder) { } @Override public void surfaceChanged...; setFocusableInTouchMode(true); this.setKeepScreenOn(true); } @Override public void surfaceCreated
根据当前旋转的角度修改生成图像的角度 记得当时有三个重写的参数surfaceCreated,surfaceChanged和surfaceDestoryed,其中我们在surfaceCreated中加入了打开...SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); //保持屏幕常亮 holder.setKeepScreenOn(true); } @Override public void surfaceCreated
svDanMuHolder.setFormat(PixelFormat.TRANSPARENT); //PixelFormat: 像素格式, TRANSPARENT(2):透明的; TRANSLUCENT(-3):半透明 } /** * surfaceCreated...:创建 * * @param holder */ @Override public void surfaceCreated(SurfaceHolder holder) { if (holder == svVideoHolder
如放在构造方法或者onCreate()方法中,都会照成没有预览效果. (3) SurfaceHolder.Callback,这是个holder用来显示surfaceView 数据的接口,他分别必须实现3个方法 surfaceCreated...holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//设置类型 } @Override public void surfaceCreated...height) { myCamera.startPreview(); } @Override public void surfaceCreated...height) { myCamera.startPreview(); } @Override public void surfaceCreated...; myCamera.startPreview(); } @Override public void surfaceCreated
/ 对 surfaceView 进行操作 remote_holder.addCallback(new SurfaceHolder.Callback() { @Override public void surfaceCreated...remote_holder.unlockCanvasAndPost(c); */} @Override public void surfaceDestroyed(SurfaceHolder holder) { } });// 自动运行surfaceCreated...remote_sv.getHolder(); local_holder.addCallback(new SurfaceHolder.Callback() { @Override public void surfaceCreated
而刚才生成的三个方法中,我们要在SurfaceCreated中加入开户摄像机的方法,在SurfaceDestroyed加入关闭摄像机的方法 ? 开启摄像机 ? ? 关闭摄像机 ?...SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); //保持屏幕常亮 holder.setKeepScreenOn(true); } @Override public void surfaceCreated
= 0 private val speedX = 5 init { holder.addCallback(this) } override fun surfaceCreated...在 surfaceCreated() 方法中启动了一个线程,该线程在独立的表面上绘制一个移动的矩形。 5.
created for you while the SurfaceView's window is visible; you should implement SurfaceHolder.Callback#surfaceCreated...drawing thread only touches the underlying Surface while it is valid -- between SurfaceHolder.Callback.surfaceCreated
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