Question

我已经对这个问题进行了大量的研究，并且已经看到了一些很好的反应，并找到了解决这个问题的“解决方案”的一些好资源。不幸的是，我仍然在某些设备上遇到很多应用程序崩溃。崩溃发生在某人拍摄照片后，相机意图应将信息传递回调用活动。出于我的应用程序的目的，我只是使用新拍摄的照片覆盖任何现有照片，因此我可以使用几乎一个静态路径到文件位置。以下是我称之为意图的方式：

        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，我是从一个单独的类创建的，因为这解决了另一个问题，即按“完成”或复选标记或者它是否在特定设备上关闭相机意图不是在几种设备类型上做任何事情。通过从单独的类创建URI，它可以解决该问题，原因不明。

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（因为它覆盖了现有的照片），我只是在我的活动中调用另一种方法来调整照片的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意图中保存的图像文件的静态路径。

我认为调整大小，旋转方法可能导致崩溃，但我不明白为什么会这样，所有看起来都像是非常标准的java编码。

任何人都可以看到我在这里做的事情明显错误吗？正如我在这个帖子的标题中所说，我的代码导致大约20％运行它的设备崩溃，这是不可接受的。我可以处理5％而不是20％。

我意识到Android开发在这方面有点噩梦，因为你必须考虑到许多不同的设备类型（制造商，Android等版本），但我认为相机活动应该比这更好地标准化。正如我在这篇帖子的顶部所说的那样，我已经做了很多关于这个问题的研究，并看到了几个与我有类似问题的人，但没有覆盖大多数设备的良好解决方案。我真的不想从零开始编写（我认为我不应该写）我自己的相机。在Android设备上必须更好地实现默认的内置摄像头意图......我还没有找到它。正如您所看到的，我甚至不关心动态创建图像，这会使这个项目变得更容易。

TIA

编辑：根据下面的评论，我添加了一个失败的相机的堆栈跟踪。它看起来像一个空指针异常。我拍了6张照片，并继续使用调用相机意图的按钮返回，直到最终失败。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

也许是一个猜测，但我认为我有同样的问题，我修复了它在新的AsyncTask中读取位图，而不是在UI线程中。

异常发生（显然是以随机方式）调用

getContentResolver().notifyChange(selectedImage, null);

其中selectedImage是

之前设置的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)

Answer 2

在这个问题上苦苦挣扎我注意到在某些设备上拍摄的照片太大了甚至无法在ImageView上显示（有关于图像太宽以至于纹理的警告），所以我开始调整它的大小服务器可用的大小。

我会发布整个代码（至少是关于拍摄和操纵图片的代码）以防万一它可以提供帮助

这是调用意图的代码

 public void takePhoto() {

      String directoryPath = DCIM_PATH;
      this.pictureFileName = Long.toHexString(System.currentTimeMillis())+".jpg";
      String filePath = directoryPath + pictureFileName ;
      File directory = new File(directoryPath);

      if (!directory.exists()) {
          directory.mkdirs();
       }

       this.imageUri = Uri.parse(filePath);
       Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
       intent.putExtra( 
             MediaStore.EXTRA_OUTPUT,Uri.fromFile( new File(filePath) )
       );

       startActivityForResult(intent, TAKE_PICTURE);

 }

在onActivityResult中的

我调用一种方法来处理新拍摄的图片

 @Override
 public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
            case TAKE_PICTURE:
               if (resultCode == Activity.RESULT_OK) {
                           loadImageJustTaken(imageUri);
               }
            break;
        }
 }

这是所说的方法

public void loadImageJustTaken(Uri selectedImage) {

        mActivity.getApplicationContext().getContentResolver().notifyChange(selectedImage, null);
        /*
         * process image to make its wide equals IMG_WIDTH constant, so that larger images will fit in ImageView
         */

         Bitmap b = BitmapHelper.decodeFileToScaledBitmap(new File(imageUri.getPath()), Tapabook.IMG_WIDTH);
        ivPicture.setImageBitmap(b);
        ivPicture.setVisibility(View.VISIBLE);
        System.gc(); 
 }

以下是我的 BitmapHelper 类

的代码

public class BitmapHelper {


    private static final String LOGTAG = "BitmapHelper";

    public static File scaleBitmapFile(File f, int WIDTH) throws IOException{
            Log.d(LOGTAG, "scaleBitmapFile to WIDTH: " + WIDTH);

            Bitmap b2 = decodeFileToScaledBitmap( f, WIDTH);
            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
            Log.d(LOGTAG, "scaleBitmapFile compress bitmap to jpg ");
            b2.compress(Bitmap.CompressFormat.JPEG,70 , outStream);

            File scaledBitmapFile = new File(Environment.getExternalStorageDirectory()
            + File.separator + "temp.jpg");
            Log.d(LOGTAG, "scaleBitmapFile file: temp.jpg" );
            scaledBitmapFile.createNewFile();
            Log.d(LOGTAG, "scaleBitmapFile file CREATED" );
            //write the bytes in file
            FileOutputStream fo = new FileOutputStream(scaledBitmapFile);
            fo.write(outStream.toByteArray());
            Log.d(LOGTAG, "scaleBitmapFile file WRITTEN" );
            // remember close de FileOutput
            fo.close();
            Log.d(LOGTAG, "scaleBitmapFile file CLOSED" );

            return scaledBitmapFile;
    }

    public static Bitmap decodeFileToScaledBitmap(File f, int WIDTH){
            Log.d(LOGTAG, "decodeFileToScaledBitmap to WIDTH: " + WIDTH);
            try{
                    //Decode image size
                    BitmapFactory.Options o = new BitmapFactory.Options();
                    o.inJustDecodeBounds = true;
                    BitmapFactory.decodeStream(new FileInputStream(f),null,o);

                    //The new size we want to scale to
                    final int REQUIRED_WIDTH=WIDTH;

                    final int ORIG_WIDTH  = o.outWidth;
                    final int ORIG_HEIGHT = o.outHeight;
                    Log.d(LOGTAG, "decodeFileToScaledBitmap original width: [" + ORIG_WIDTH + "] original height: [" + ORIG_HEIGHT+ "]");
                    final int REQUIRED_HEIGHT = ORIG_HEIGHT/( ORIG_WIDTH / REQUIRED_WIDTH ) ;

                    //Decode with scaled height
                    Log.d(LOGTAG, "decodeFileToScaledBitmap returning scaled bitmap ");
                    return Bitmap.createScaledBitmap(
                                    BitmapFactory.decodeFile(f.getAbsolutePath()), 
                                    REQUIRED_WIDTH, 
                                    REQUIRED_HEIGHT, 
                                    false);
            }catch (FileNotFoundException e) {
                    Log.e(LOGTAG, "decodeFileToScaledBitmap FileNotFoundException: " +e.getMessage());
            }
            return null;
    }

    public static Bitmap scaleBitmap(Bitmap b, int WIDTH){
            final int REQUIRED_WIDTH=WIDTH;

            final int ORIG_WIDTH  = b.getWidth();
            final int ORIG_HEIGHT = b.getHeight();
            Log.d(LOGTAG, "scaleBitmap original width: [" + ORIG_WIDTH + "] original height: [" + ORIG_HEIGHT+ "]");
            final int REQUIRED_HEIGHT = ORIG_HEIGHT/( ORIG_WIDTH / REQUIRED_WIDTH ) ;
            Log.d(LOGTAG, "scaleBitmap returning scaled bitmap ");
            return Bitmap.createScaledBitmap(
                            b, 
                            REQUIRED_WIDTH, 
                            REQUIRED_HEIGHT, 
                            false); 
    }
}

使用此功能时，使用三星设备拍摄照片时不再出现问题，例如SG3 / Apollo等旧款手持设备或SGTab 10.1等新款平板电脑希望它有所帮助：）

Answer 3

在此处查看此帖子 Content uri crashes camera on Android KitKat

某些较早的相机应用程序无法正确支持content：// URI，并且在传递非file：// URI的EXTRA_OUTPUT时将崩溃。在更新代码以支持Android N +中的FileProvider时，我注意到了该错误。如果您将URI更改为SDK小于Android N的应用程序的file：// URI，则应该能够解决此问题。

Android相机意图在某些手机上崩溃应用程序（约占其中的20％）

3 个答案: