android camera intent 在某些手机上使应用程序崩溃(大约 20%)

Question

我对这个问题做了很多研究，看到了一些很好的回应，并找到了一些很好的“解决方案”资源来解决这个问题。然而不幸的是，我在某些设备上仍然遇到很多应用程序崩溃。崩溃发生在有人拍照后，相机 Intent 应该将信息传递回调用 Activity 。出于我的应用程序的目的，我只是用新拍摄的照片覆盖任何现有照片，这样我就可以使用几乎静态的文件位置路径。以下是我如何称呼 Intent :

        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        // get the file path from an external class (necessary for galaxy nexus)
        imageFileAndPath = ImageServices.getOutputImageFileUri(cont);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageFileAndPath);
        startActivityForResult(intent, CAMERA_REQUEST_CODE);

imageFileAndPath 只是一个 URI 变量，我正在从一个单独的类中创建它，因为这解决了另一个问题，即按下“完成”或复选标记或 w/e 它在特定设备上以关闭相机 Intent 不是在多种设备类型上做任何事情。通过从一个单独的类创建 URI，它解决了一些未知原因的问题。

我的 onActivityResult 看起来像这样:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(resultCode == Activity.RESULT_OK)
    {
        if (requestCode == CAMERA_REQUEST_CODE) {
            setupImageView();
    imageView = (ImageView) findViewById(R.id.image_view);
            webView.setVisibility(View.GONE);
            imageView.setVisibility(View.VISIBLE);
            button.setVisibility(View.GONE);
            reTakePicButton.setVisibility(View.VISIBLE);
            rl.setVisibility(View.VISIBLE);    
        }
    }
}

因为我不需要动态路径来保存我的照片(因为它会覆盖现有照片)，我只是在我的 Activity 中调用另一个方法来调整照片大小并相应地旋转它。该方法如下:

private void setupImageView() {     
    imageLocation = Environment.getExternalStorageDirectory().getAbsolutePath() + "/myappphoto/myappphoto.jpg";


    // Get the dimensions of the View
    Display display = getWindowManager().getDefaultDisplay();
    Point size = getDisplaySize(display);
    int targetW = size.x;

    // Get the dimensions of the bitmap
    BitmapFactory.Options bmOptions = new BitmapFactory.Options();
    bmOptions.inJustDecodeBounds = true;

    BitmapFactory.decodeFile(imageLocation, bmOptions);
    int photoW = bmOptions.outWidth;
    int photoH = bmOptions.outHeight;

    // Determine how much to scale down the image
    int scaleFactor = Math.min(photoW / targetW, photoH / targetW);

    // Decode the image file into a Bitmap sized to fill the View
    bmOptions.inJustDecodeBounds = false;
    bmOptions.inSampleSize = scaleFactor;
    bmOptions.inPurgeable = true;

    Bitmap bitmap = BitmapFactory.decodeFile(imageLocation, bmOptions);
    int rotationForImage = getRotationForImage(imageLocation);
    if (rotationForImage != 0) {
        int targetWidth = rotationForImage == 90 || rotationForImage == 270 ? bitmap.getHeight() : bitmap.getWidth();
        int targetHeight = rotationForImage == 90 || rotationForImage == 270 ? bitmap.getWidth() : bitmap.getHeight();




        Bitmap rotatedBitmap = Bitmap.createBitmap(targetWidth, targetHeight, bitmap.getConfig());
        Canvas canvas = new Canvas(rotatedBitmap);
        Matrix matrix = new Matrix();
        matrix.setRotate(rotationForImage, bitmap.getWidth() / 2, bitmap.getHeight() / 2);
        canvas.drawBitmap(bitmap, matrix, new Paint());

        bitmap.recycle();
        bitmap = rotatedBitmap;

    }



    Bitmap resized;

    if(bitmap.getWidth() >= 900 || bitmap.getHeight() >=900)
    {
        int newWidth = Math.round(bitmap.getWidth()/2);
        int newHeight = Math.round(bitmap.getHeight()/2);
        resized = Bitmap.createScaledBitmap(bitmap, newWidth, newHeight, true);
    }
    else
    {
        resized = bitmap;
    }
    //bitmap.recycle();
    bitmap = resized;


    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.JPEG, 70, bytes);

    try
    {
        File f = new File(imageLocation);
        f.createNewFile();
        //write the bytes in file
        FileOutputStream fo = new FileOutputStream(f);
        fo.write(bytes.toByteArray());
        fo.close();
    }
    catch(java.io.IOException e){}
    imageView.setImageBitmap(bitmap);

}

您可以在该方法顶部看到从相机 Intent 保存的图像文件的静态路径。

我想可能是调整大小、旋转方法导致了崩溃，但我不明白为什么会这样，对我来说这一切看起来都像是非常标准的 Java 编码。

有人能看出我在这里做的事情有什么明显的错误吗？正如我在此线程的标题中所说，我的代码导致大约 20% 的运行它的设备崩溃，这是 Not Acceptable 。我可以处理 5%，但不能处理 20%。

我意识到 android 开发在这方面有点像噩梦，因为您必须考虑这么多不同的设备类型(制造商、android 版本等)，但我认为相机 Activity 应该比这更好地标准化。正如我在此线程顶部所说，我已经对这个问题做了很多研究，并且看到几个人遇到了与我类似的问题，但没有涵盖大多数设备的良好解决方案。我真的不想从零开始写(我也不认为我应该写)我自己的相机。在 Android 设备上必须有更好的默认内置相机 Intent 的实现......我还没有找到它。如您所见，我什至不关心动态创建图像，这应该会使这个项目变得容易得多。

TIA

编辑:根据下面的评论，我添加了来自故障相机的堆栈跟踪。它看起来像一个空指针异常。我拍了大约 6 张照片，然后一直使用调用相机 Intent 的按钮返回，直到最后让它失败。这是堆栈跟踪:

STACK_TRACE
"java.lang.RuntimeException: Unable to resume activity {com.myapp/com.myapp.MyActivity}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=904, result=-1, data=null} to activity {com.myapp/com.myapp.MyActivity}: java.lang.NullPointerException
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2124)
    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2139)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1672)
    at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:2836)
    at android.app.ActivityThread.access$1600(ActivityThread.java:117)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:130)
    at android.app.ActivityThread.main(ActivityThread.java:3687)
    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:842)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
    at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=904, result=-1, data=null} to activity {com.myapp/com.myapp.MyActivity}: java.lang.NullPointerException
    at android.app.ActivityThread.deliverResults(ActivityThread.java:2536)
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2111)
    ... 13 more
Caused by: java.lang.NullPointerException
    at com.myapp.MyActivity.onActivityResult(EnterContest.java:257)
    at android.app.Activity.dispatchActivityResult(Activity.java:3908)
    at android.app.ActivityThread.deliverResults(ActivityThread.java:2532)
    ... 14 more
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=904, result=-1, data=null} to activity {com.myapp/com.myapp.MyActivity}: java.lang.NullPointerException
    at android.app.ActivityThread.deliverResults(ActivityThread.java:2536)
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2111)
    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2139)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1672)
    at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:2836)
    at android.app.ActivityThread.access$1600(ActivityThread.java:117)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:130)
    at android.app.ActivityThread.main(ActivityThread.java:3687)
    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:842)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
    at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
    at com.myapp.MyActivity.onActivityResult(EnterContest.java:257)
    at android.app.Activity.dispatchActivityResult(Activity.java:3908)
    at android.app.ActivityThread.deliverResults(ActivityThread.java:2532)
    ... 14 more
java.lang.NullPointerException
    at com.myapp.MyActivity.onActivityResult(EnterContest.java:257)
    at android.app.Activity.dispatchActivityResult(Activity.java:3908)
    at android.app.ActivityThread.deliverResults(ActivityThread.java:2532)
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2111)
    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2139)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1672)
    at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:2836)
    at android.app.ActivityThread.access$1600(ActivityThread.java:117)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:130)
    at android.app.ActivityThread.main(ActivityThread.java:3687)
    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:842)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
    at dalvik.system.NativeStart.main(Native Method)

Answer 1

也许是猜测，但我想我遇到了同样的问题，我修复了它在新的 AsyncTask 中而不是在 UI 线程中读取位图。

异常发生(显然是随机的)调用

getContentResolver().notifyChange(selectedImage, null);

其中selectedImage是之前在

中设置的URI

intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photo));

你在 com.myapp.MyActivity.onActivityResult(EnterContest.java:257) 中调用了什么？

我有一个用 ACRA 收集的堆栈跟踪:

java.lang.RuntimeException: Unable to resume activity {com.infonair.meetme.app/com.infonair.meetme.activity.photo.TakePhotoActivity}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=7898789, result=-1, data=Intent { dat=content://media/external/images/media/9 }} to activity {com.infonair.meetme.app/com.infonair.meetme.activity.photo.TakePhotoActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2126)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2141)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1674)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:2838)
at android.app.ActivityThread.access$1600(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3737)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:894)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=7898789, result=-1, data=Intent { dat=content://media/external/images/media/9 }} to activity {com.infonair.meetme.app/com.infonair.meetme.activity.photo.TakePhotoActivity}: java.lang.NullPointerException
at android.app.ActivityThread.deliverResults(ActivityThread.java:2538)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2113)
... 13 more
Caused by: java.lang.NullPointerException
at android.os.Parcel.readException(Parcel.java:1328)
at android.os.Parcel.readException(Parcel.java:1276)
at android.content.IContentService$Stub$Proxy.notifyChange(IContentService.java:458)
at android.content.ContentResolver.notifyChange(ContentResolver.java:912)
at android.content.ContentResolver.notifyChange(ContentResolver.java:898)
at com.infonair.meetme.activity.photo.TakePhotoActivity.onActivityResult(TakePhotoActivity.java:154)
at android.app.Activity.dispatchActivityResult(Activity.java:3908)
at android.app.ActivityThread.deliverResults(ActivityThread.java:2534)
... 14 more
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=7898789, result=-1, data=Intent { dat=content://media/external/images/media/9 }} to activity {com.infonair.meetme.app/com.infonair.meetme.activity.photo.TakePhotoActivity}: java.lang.NullPointerException
at android.app.ActivityThread.deliverResults(ActivityThread.java:2538)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2113)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2141)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1674)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:2838)
at android.app.ActivityThread.access$1600(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3737)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:894)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.os.Parcel.readException(Parcel.java:1328)
at android.os.Parcel.readException(Parcel.java:1276)
at android.content.IContentService$Stub$Proxy.notifyChange(IContentService.java:458)
at android.content.ContentResolver.notifyChange(ContentResolver.java:912)
at android.content.ContentResolver.notifyChange(ContentResolver.java:898)
at com.infonair.meetme.activity.photo.TakePhotoActivity.onActivityResult(TakePhotoActivity.java:154)
at android.app.Activity.dispatchActivityResult(Activity.java:3908)
at android.app.ActivityThread.deliverResults(ActivityThread.java:2534)
... 14 more
java.lang.NullPointerException
at android.os.Parcel.readException(Parcel.java:1328)
at android.os.Parcel.readException(Parcel.java:1276)
at android.content.IContentService$Stub$Proxy.notifyChange(IContentService.java:458)
at android.content.ContentResolver.notifyChange(ContentResolver.java:912)
at android.content.ContentResolver.notifyChange(ContentResolver.java:898)
at com.infonair.meetme.activity.photo.TakePhotoActivity.onActivityResult(TakePhotoActivity.java:154)
at android.app.Activity.dispatchActivityResult(Activity.java:3908)
at android.app.ActivityThread.deliverResults(ActivityThread.java:2534)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2113)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2141)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1674)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:2838)
at android.app.ActivityThread.access$1600(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3737)
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:894)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)
at dalvik.system.NativeStart.main(Native Method)