takepicture挂在Android 2.3.3 [英] takepicture hangs on Android 2.3.3

问题描述

我有一些$ C $的拍照中的Andr​​oid 2.1和2.2这工程CS。 但是，打破了C $ CS这些$在的Andr​​oid 2.3。 花时间来解决这个问题，其中又以徒劳之后，我想问一下在这里帮助。

I have some codes of taking picture which works in Android 2.1 and 2.2. But these codes broke at Android 2.3. After spending time to fix this issue which went in vain, I would like to ask for help here.

我的code流向拍照是这样的：

My code flow to take picture is like this:

创建一个类Camlayer扩展了SurfaceView

public class CamLayer extends SurfaceView implements SurfaceHolder.Callback {
    private void init(Context context){
        // Install a SurfaceHolder.Callback so we get notified when the
        // underlying surface is created and destroyed.
        mHolder = getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        mCamera = Camera.open();
    }

    public CamLayer(Context context) {
        super(context);
        init(context);
    }

    public CamLayer(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        Log.i(TAG+".surfaceChanged", "being called!");
        Log.i(TAG+".surfaceChanged", "w="+w); 
        Log.i(TAG+".surfaceChanged", "h="+h);
        if (isPreviewRunning) {
            mCamera.stopPreview();
        }

        try {
            mCamera.setPreviewDisplay(holder);
            mCamera.setPreviewCallback(mPreviewCallback);
        } catch (IOException e) {
            Log.e(TAG+".surfaceCreated", "mCamera.setPreviewDisplay(holder);");
        }

        Camera.Parameters p = mCamera.getParameters();  
        setOptimalSize(p, w, h, SIZEOFPREVIEW);
        setOptimalSize(p, w, h, SIZEOFPICTURE);
        mCamera.setParameters(p);

        mCamera.startPreview();
        isPreviewRunning = true;
    }

    public void takePicture(){
        Log.i(TAG+".takePicture", "being called!");
        mCamera.takePicture(null, null, mPictureCallback);
        Log.i(TAG+".takePicture", "call ended!");
    }
}

CamLayer.takePicture（）将被外部类调用启动。

CamLayer.takePicture() will be called by external classes to start.

现在的问题是，在安卓2.3.3的 takePicture 将挂起，这样的ANR的问题被发现。在 /data/anr/traces.txt ，下面被发现。正如你所看到的， native_takePicture 永不再来。

The problem is that at Android 2.3.3, the takePicture will hang, so an ANR problem is found. In /data/anr/traces.txt, below are found. As you can see, the native_takePicture never returns.

DALVIK主题：

(mutexes: tll=0 tsl=0 tscl=0 ghl=0 hwl=0 hwll=0)
"main" prio=5 tid=1 NATIVE

  | group="main" sCount=1 dsCount=0 obj=0x40022170 self=0xce68

  | sysTid=2411 nice=0 sched=0/0 cgrp=default handle=-1345006464

  at android.hardware.Camera.native_takePicture(Native Method)

  at android.hardware.Camera.takePicture(Camera.java:746)

  at android.hardware.Camera.takePicture(Camera.java:710)

  at oms.cj.tube.camera.CamLayer.takePicture(CamLayer.java:256)

  at oms.cj.tube.camera.DefineColor.takePicture(DefineColor.java:61)

  at oms.cj.tube.camera.DefineColor.onKeyUp(DefineColor.java:71)

  at android.view.KeyEvent.dispatch(KeyEvent.java:1280)

  at android.app.Activity.dispatchKeyEvent(Activity.java:2078)

  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:16
66)
  at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2571)

  at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2546)

  at android.view.ViewRoot.handleMessage(ViewRoot.java:1878)

  at android.os.Handler.dispatchMessage(Handler.java:99)

  at android.os.Looper.loop(Looper.java:123)

  at android.app.ActivityThread.main(ActivityThread.java:3691)

  at java.lang.reflect.Method.invokeNative(Native Method)

  at java.lang.reflect.Method.invoke(Method.java:507)

  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)

  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)

  at dalvik.system.NativeStart.main(Native Method)

有没有人有同样的问题？并知道如何解决它？

Is there anybody having the same problem? And know how to fix it?

推荐答案

我还观察到mCamera.takePicture（NULL，NULL，处理程序）的冻结。我试图清除preVIEW处理程序：调用takePicture（）之前mCamera.set previewCallback（空），和它的作品现在

I also observed mCamera.takePicture(null, null, handler) to freeze. I tried to clear the preview handler: mCamera.setPreviewCallback(null) before calling takePicture(), and it works now.

这篇关于takepicture挂在Android 2.3.3的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！