takepicture 在 Android 2.3.3 上挂起 [英] takepicture hangs on Android 2.3.3

问题描述

我有一些适用于 Android 2.1 和 2.2 的拍照代码.但是这些代码在 Android 2.3 中被破坏了.在花时间解决了这个徒劳无功的问题后，我想在这里寻求帮助.

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.

我的拍照代码流程是这样的:

My code flow to take picture is like this:

创建一个类 Camlayer 扩展 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()会被外部类调用启动.

问题是在Android 2.3.3，takePicture会挂掉，所以发现了ANR问题.在 /data/anr/traces.txt 中，可以找到以下内容.如您所见，native_takePicture 永远不会返回.

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.

达尔维克线程:

(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)

有人遇到同样的问题吗?并且知道如何解决它?

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

推荐答案

我也观察到 mCamera.takePicture(null, null, handler) 卡住了.我尝试在调用 takePicture() 之前清除预览处理程序:mCamera.setPreviewCallback(null)，现在它可以工作了.

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 在 Android 2.3.3 上挂起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！