takepicture挂在Android 2.3.3上

我有一些在 Android 2.1和2.2中可以使用的照片代码.
但这些代码破解在Android 2.3.
在花费时间解决这个无效的问题之后,我想在这里寻求帮助.

我的代码流程如下图所示：

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,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()将被外部类调用来启动.

问题是在Android 2.3.3,takePicture将挂起,所以找到一个ANR问题.在/data/anr/traces.txt中,找到以下内容.如你所见,native_takePicture永远不会返回.

DALVIK螺纹：

(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？知道如何解决？

解决方法

我也观察到mCamera.takePicture(null,handler)来冻结.我尝试清除预览处理程序：mCamera.setPreviewCallback(null)在调用takePicture()之前,它现在工作.