java - android camera：将结果 ResultInfo{who=null, request=0, result=-1, data=null} 传递给活动失败

Question

我真的很沮丧解决我的问题，我有一个使用相机的应用程序，当相机拍摄照片时，它将显示在活动中，当我不使用cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mPhotoUri);照片时将显示在活动中，但名称和路径文件不是就像我想要的一样。我正在使用 Galaxy Tab 进行编译，我已经按照教程从这里、这里和这里解决了我的问题，但我的应用程序仍然强制关闭和错误，这是我的代码：

{
    File sdCard = Environment.getExternalStorageDirectory();
    File path = new File (sdCard.getAbsolutePath() + "/android/data/spaj_foto");
    path.mkdir();
    File file = new File (path,"spaj_foto.png");
    String filePath ="/android/data/spaj_foto/spaj_foto.png";

    try {
        file.createNewFile();
    } catch (IOException e) {}       


    mPhotoUri = Uri.fromFile(file); 
    values.put(MediaStore.Images.ImageColumns.DATA, file.getPath());
    mPhotoUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);

    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mPhotoUri);
    startActivityForResult(cameraIntent,TAKE_PHOTO_CODE );  

}

活动结果方法：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
    if (requestCode == TAKE_PHOTO_CODE && resultCode == RESULT_OK) {
        Bitmap photo = (Bitmap) data.getExtras().get("data"); 
        image_spaj.setImageBitmap(photo);


        // CALL THIS METHOD TO GET THE URI FROM THE BITMAP
        Uri tempUri = getImageUri(getApplicationContext(), photo);

        // CALL THIS METHOD TO GET THE ACTUAL PATH
        File finalFile = new File(getRealPathFromURI(tempUri));

//              System.out.println(mImageCaptureUri);
    }  
}
public String getRealPathFromURI(Uri mPhotoUri) {
    Cursor cursor = getContentResolver().query(mPhotoUri, null, null, null, null); 
    cursor.moveToFirst(); 
    int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA); 
    return cursor.getString(idx); 
}

public Uri getImageUri(Context inContext, Bitmap inImage) {
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
    String path = Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
    return Uri.parse(path);
}

这是我的 logcat 说：

    09-27 10:59:43.186: E/AndroidRuntime(31318): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=-1, data=null} to activity {org.example.touch/org.example.touch.FormSpaj}: java.lang.NullPointerException
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3179)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3222)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.ActivityThread.access$1100(ActivityThread.java:140)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1276)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.os.Handler.dispatchMessage(Handler.java:99)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.os.Looper.loop(Looper.java:137)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.ActivityThread.main(ActivityThread.java:4895)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at java.lang.reflect.Method.invokeNative(Native Method)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at java.lang.reflect.Method.invoke(Method.java:511)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at dalvik.system.NativeStart.main(Native Method)
09-27 10:59:43.186: E/AndroidRuntime(31318): Caused by: java.lang.NullPointerException
09-27 10:59:43.186: E/AndroidRuntime(31318):    at org.example.touch.FormSpaj.onActivityResult(FormSpaj.java:993)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.Activity.dispatchActivityResult(Activity.java:5347)
09-27 10:59:43.186: E/AndroidRuntime(31318):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3175)
09-27 10:59:43.186: E/AndroidRuntime(31318):    ... 11 more

我真的希望有人可以帮助我解决我的问题，我已经堆叠并且不能再思考了，请有人帮助我......谢谢。

score 22 · Accepted Answer

确保您同时拥有相机权限和读/写外部存储权限。

试试这对我来说就像魅力一样

private String selectedImagePath = "";
    final private int PICK_IMAGE = 1;
    final private int CAPTURE_IMAGE = 2;

public Uri setImageUri() {
        // Store image in dcim
        File file = new File(Environment.getExternalStorageDirectory() + "/DCIM/", "image" + new Date().getTime() + ".png");
        Uri imgUri = Uri.fromFile(file);
        this.imgPath = file.getAbsolutePath();
        return imgUri;
    }


    public String getImagePath() {
        return imgPath;
    }

btnGallery.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setType("image/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(intent, ""), PICK_IMAGE);

            }
        });

        btnCapture.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                final Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, setImageUri());
                startActivityForResult(intent, CAPTURE_IMAGE);
            }
        });

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode != Activity.RESULT_CANCELED) {
            if (requestCode == PICK_IMAGE) {
                selectedImagePath = getAbsolutePath(data.getData());
                imgUser.setImageBitmap(decodeFile(selectedImagePath));
            } else if (requestCode == CAPTURE_IMAGE) {
                selectedImagePath = getImagePath();
                imgUser.setImageBitmap(decodeFile(selectedImagePath));
            } else {
                super.onActivityResult(requestCode, resultCode, data);
            }
        }

    }


public Bitmap decodeFile(String path) {
        try {
            // Decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            BitmapFactory.decodeFile(path, o);
            // The new size we want to scale to
            final int REQUIRED_SIZE = 70;

            // Find the correct scale value. It should be the power of 2.
            int scale = 1;
            while (o.outWidth / scale / 2 >= REQUIRED_SIZE && o.outHeight / scale / 2 >= REQUIRED_SIZE)
                scale *= 2;

            // Decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize = scale;
            return BitmapFactory.decodeFile(path, o2);
        } catch (Throwable e) {
            e.printStackTrace();
        }
        return null;

    }

public String getAbsolutePath(Uri uri) {
        String[] projection = { MediaColumns.DATA };
        @SuppressWarnings("deprecation")
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        if (cursor != null) {
            int column_index = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
            cursor.moveToFirst();
            return cursor.getString(column_index);
        } else
            return null;
    }

score 7 · Accepted Answer

试试这个，昨天我有同样的问题。使用下面的代码我纠正了问题。试一试。

注意：并且还configChanges为特定活动添加。在调用相机意图活动时将被刷新。你需要避免这种情况。android:configChanges="orientation|keyboardHidden|screenSize"

btnGallery.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
           intent = new Intent(Intent.ACTION_PICK);
                            intent.setType("image/*");
                            startActivityForResult(intent, 1);
        }
    });

    btnCapture.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent intent = new Intent(
                                    MediaStore.ACTION_IMAGE_CAPTURE);
                            File file = new File(Environment
                                    .getExternalStorageDirectory(),
                                    "test.jpg");

                            outputFileUri = Uri.fromFile(file);
                            Log.d("TAG", "outputFileUri intent"
                                    + outputFileUri);
                            intent.putExtra(MediaStore.EXTRA_OUTPUT,
                                    outputFileUri);
                            startActivityForResult(intent, 0);
        }
    });

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // TODO Auto-generated method stub
    super.onActivityResult(requestCode, resultCode, data);

    switch (requestCode) {
    case 0:
        if (resultCode == RESULT_OK) {
            Log.d("TAG", "outputFileUri RESULT_OK" + outputFileUri);
            if (outputFileUri != null) {

                Bitmap bitmap;
                bitmap = decodeSampledBitmapFromUri(outputFileUri,
                        image.getWidth(), image.getHeight());

                if (bitmap == null) {
                    Toast.makeText(getApplicationContext(),
                            "the image data could not be decoded",
                            Toast.LENGTH_LONG).show();

                } else {
                    Toast.makeText(
                            getApplicationContext(),
                            "Decoded Bitmap: " + bitmap.getWidth() + " x "
                                    + bitmap.getHeight(), Toast.LENGTH_LONG)
                            .show();
                    image.setImageBitmap(bitmap);
                }
            }
        }
        break;
    case 1:
        if (resultCode == RESULT_OK) {
            Uri targetUri = data.getData();
            Log.d("TAG", "datae" + targetUri);
            Bitmap bitmap;
            bitmap = decodeSampledBitmapFromUri(targetUri,
                    image.getWidth(), image.getHeight());

            if (bitmap == null) {
                Toast.makeText(getApplicationContext(),
                        "the image data could not be decoded",
                        Toast.LENGTH_LONG).show();

            } else {
                Toast.makeText(
                        getApplicationContext(),
                        "Decoded Bitmap: " + bitmap.getWidth() + " x "
                                + bitmap.getHeight(), Toast.LENGTH_LONG)
                        .show();
                image.setImageBitmap(bitmap);
            }
        }
        break;

    default:
        break;
    }
}

public Bitmap decodeSampledBitmapFromUri(Uri uri, int reqWidth,
        int reqHeight) {

    Bitmap bm = null;

    try {
        // First decode with inJustDecodeBounds=true to check dimensions
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(getContentResolver()
                .openInputStream(uri), null, options);

        // Calculate inSampleSize
        options.inSampleSize = calculateInSampleSize(options, reqWidth,
                reqHeight);

        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false;
        bm = BitmapFactory.decodeStream(getContentResolver()
                .openInputStream(uri), null, options);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        Toast.makeText(getApplicationContext(), e.toString(),
                Toast.LENGTH_LONG).show();
    }

    return bm;
}

public int calculateInSampleSize(BitmapFactory.Options options,
        int reqWidth, int reqHeight) {
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {
        if (width > height) {
            inSampleSize = Math.round((float) height / (float) reqHeight);
        } else {
            inSampleSize = Math.round((float) width / (float) reqWidth);
        }
    }
    return inSampleSize;
}

score 7 · Accepted Answer

我认为以下行会导致问题。

Bitmap photo = (Bitmap) data.getExtras().get("data");

您已经按以下方式传递了文件 uri

cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mPhotoUri);

当您通过 URI 传递 EXTRA_OUTPUT 时，您在 onActivityResult() 中收到的意图将为空。如果您想在此方法中获取图像，请使用您通过 EXTRA_OUTPUT 传递的路径获取图像。

score 4 · Accepted Answer

更简洁的代码，可能有助于寻找答案的人，基本上当您将文件保存到外部存储包时，结果中不再有位图，而是您必须从文件加载

String fileName;
.
. 
private void takePicture() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    // Ensure that there's a camera activity to handle the intent
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        // Create the File where the photo should go
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            // Error occurred while creating the File

        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
                    Uri.fromFile(photoFile));
            startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
        }
    }
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)        {
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {

       loadImageFromFile();
    }
}
public void loadImageFromFile(){

    ImageView view = (ImageView)this.findViewById(R.id.imageViewHeader);
    view.setVisibility(View.VISIBLE);


    int targetW = view.getWidth();
    int targetH = view.getHeight();

    // Get the dimensions of the bitmap
    BitmapFactory.Options bmOptions = new BitmapFactory.Options();
    bmOptions.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(fileName, bmOptions);
    int photoW = bmOptions.outWidth;
    int photoH = bmOptions.outHeight;

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

    // 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(fileName, bmOptions);
    view.setImageBitmap(bitmap);
}
private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
            imageFileName,  /* prefix */
            ".jpg",         /* suffix */
            storageDir      /* directory */
    );

    // Save a file: path for use with ACTION_VIEW intents
    fileName =  image.getAbsolutePath();
    return image;
}

java - android camera：将结果 ResultInfo{who=null, request=0, result=-1, data=null} 传递给活动失败

4 回答 4

Related

Reference