Android 的 Surface class 给我一个 "already connected" 错误和一个 IllegalArgumentException

Question

我正在打电话：

mSurface.lockCanvas(null);

null是可以接受的参数给lockCanvas，表示需要更新整个屏幕

我正在使用的表面正在传递给我，获取它的代码通过：

new Surface(mPlaybackView.getSurfaceTexture());

mPlaybackView是从Resources中抓取的TextureView。调用 lockCanvas(null) 时，我得到以下信息：

BufferQueueProducer: [unnamed-6903-1] connect(P): already connected (cur=3 req=2)

和

java.lang.IllegalArgumentException at android.view.Surface.nativeLockCanvas (Native Method).

我很困惑，因为我还在学习 canvas 和表面等等

这里有什么明显的错误吗？

编辑：这是堆栈跟踪。

    11-19 09:45:28.075 3319-3319/com.example.eschjen.nov15test D/Jenny: inside try, surface is: Surface(name=android.graphics.SurfaceTexture@10e80e42)/@0x3bc8b489
11-19 09:45:28.086 3319-3319/com.example.eschjen.nov15test E/BufferQueueProducer: [unnamed-3319-0] connect(P): already connected (cur=3 req=2)
11-19 09:45:28.087 3319-3319/com.example.eschjen.nov15test E/Jenny: Exception caught: 
                                                                    java.lang.IllegalArgumentException
                                                                        at android.view.Surface.nativeLockCanvas(Native Method)
                                                                        at android.view.Surface.lockCanvas(Surface.java:255)
                                                                        at com.example.eschjen.nov15test.MediaCodecWrapper.surfaceRender(MediaCodecWrapper.java:469)
                                                                        at com.example.eschjen.nov15test.MediaCodecWrapper.access0(MediaCodecWrapper.java:41)
                                                                        at com.example.eschjen.nov15test.MediaCodecWrapper.outputSample(MediaCodecWrapper.java:338)
                                                                        at com.example.eschjen.nov15test.MediaCodecWrapper.popSampleJenny(MediaCodecWrapper.java:345)
                                                                        at com.example.eschjen.nov15test.MainActivity.onTimeUpdate(MainActivity.java:183)
                                                                        at android.animation.TimeAnimator.animationFrame(TimeAnimator.java:27)
                                                                        at android.animation.ValueAnimator.doAnimationFrame(ValueAnimator.java:1248)
                                                                        at android.animation.ValueAnimator$AnimationHandler.doAnimationFrame(ValueAnimator.java:659)
                                                                        at android.animation.ValueAnimator$AnimationHandler.run(ValueAnimator.java:682)
                                                                        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
                                                                        at android.view.Choreographer.doCallbacks(Choreographer.java:580)
                                                                        at android.view.Choreographer.doFrame(Choreographer.java:549)
                                                                        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
                                                                        at android.os.Handler.handleCallback(Handler.java:739)
                                                                        at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                        at android.os.Looper.loop(Looper.java:135)
                                                                        at android.app.ActivityThread.main(ActivityThread.java:5221)
                                                                        at java.lang.reflect.Method.invoke(Native Method)
                                                                        at java.lang.reflect.Method.invoke(Method.java:372)
                                                                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
                                                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
11-19 09:45:28.087 3319-3319/com.example.eschjen.nov15test D/Jenny: done trying
11-19 09:45:28.088 3319-3319/com.example.eschjen.nov15test D/Jenny: done being synchronized.

Answer 1

我认为 mPlaybackView 是 TextureView。如果 'rect' 矩形无效，Surface.lockCanvas(rect) 可以抛出 IllegalArgumentException 。

E/BufferQueueProducer: [unnamed-3319-0] connect(P): already connected (cur=3 req=2)

来自TextureView中的documentation：

A TextureView's SurfaceTexture can be obtained either by invoking getSurfaceTexture() or by using a TextureView.SurfaceTextureListener. It is important to know that a SurfaceTexture is available only after the TextureView is attached to a window (and onAttachedToWindow() has been invoked.) It is therefore highly recommended you use a listener to be notified when the SurfaceTexture becomes available. It is important to note that only one producer can use the TextureView. For instance, if you use a TextureView to display the camera preview, you cannot use lockCanvas() to draw onto the TextureView at the same time.

您需要确保与此 TextureView 关联的 SurfaceTexture 可用于呈现。您可以使用 TextureView.isAvailable() 来确认。

Answer 2

我正在用相同的 TextureView 和 SurfaceTexture 切换相机。同样的错误 already connected 对我来说 surface.release 有效。一些代码片段供您参考：

启动相机时执行此操作

if (previewSurfaceTarget == null) previewSurfaceTarget = new Surface(mPreviewSurfaceTexture);

重启前执行此操作

if (null != mCameraDevice) {
    mCameraDevice.close();
    mCameraDevice = null;
    mCameraIsOpen = false;
}

if (previewSurfaceTarget != null)
previewSurfaceTarget.release();
previewSurfaceTarget = null;

Android 的 Surface class 给我一个 "already connected" 错误和一个 IllegalArgumentException

Android's Surface class gives me an "already connected" error, and a IllegalArgumentException

android

android-canvas