如何在Fragment Android中捕获图像

Question

I am working with capturing an image and then show it on my ImageView in my fragment. I searched this through web and still I cannot make it. Below is what I am doing.

btnCaptureImg.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
        startActivityForResult(cameraIntent, 1888); 
    }
});

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.e("LOG", ""+requestCode);
    if (requestCode == 1888 && resultCode == Activity.RESULT_OK) {  
        Bitmap photo = (Bitmap) data.getExtras().get("data"); 
        imageView.setImageBitmap(photo);
    }

    super.onActivityResult(requestCode, resultCode, data);
}  

The Logcat says 1888 only but the imageView did not load the image.

I also tried this

btnCaptureImg.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        File folder = new File(Environment.getExternalStorageDirectory().toString()+"/ImagesFolder/");
        folder.mkdirs();

        Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        resultingFile = new File(folder.toString() + "/image.jpg");
        Uri uriSavedImage=Uri.fromFile(resultingFile);
        cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, uriSavedImage);

        startActivityForResult(cameraIntent, 1888);
    }
});

But it throws exception:

E/AndroidRuntime(4824): java.lang.RuntimeException: Unable to resume activity {com.myapp.android/com.myapp.android.MyHomeActivity}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=264032, result=-1, data=null} to activity {com.myapp.android/com.myapp.android.MyHomeActivity}: java.lang.NullPointerException
E/AndroidRuntime(4824):     at com.myapp.android.MyFragment.onActivityResult(MyFragment.java:300)

Answer 1

Check if your onActicityResult is beeing called. If not check: onActivityResult is not being called in Fragment

Answer 2

Try putting

cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, your_image_uri);

before this

startActivityForResult(cameraIntent, 1888);

I'm sorry mate but I can't seem to understand why it's giving that exception. Try this approach, it works for me.

Define the file globally and inside onActivityResult

    if (requestCode == 1888 && resultCode == Activity.RESULT_OK) { 
        Bitmap  photo = Media.getBitmap(getActivity().getContentResolver(), Uri.fromFile(resultingFile)); 
        //Bitmap photo = (Bitmap) data.getExtras().get("data"); 
        imageView.setImageBitmap(photo);
    }

Answer 3

First, in the fragment starts the intent to capture the image:

private void startIntentImageCapture() {
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    try {
        File storageDir = Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile("imageName.jpg", ".jpg", storageDir);
        path = Uri.fromFile(image);
        cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, path);
        getActivity().startActivityForResult(cameraIntent, CAPTURE_IMAGE_REQUEST_CODE);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

path variable, must be an public static Uri instance. And another public static Integer for the request code: public static final Integer CAPTURE_IMAGE_REQUEST_CODE = 100;

Then in the Activity , read this path and decode the image:

 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == YourFragment.CAPTURE_IMAGE_REQUEST_CODE) {
            if (resultCode == RESULT_OK) {
                Bitmap imageBitmap = decodeFile(YourFragment.path);
                //do something with your photo
            }
        }
    }

I'm sure this is not the best and cleaner method but it works for me. Hope it helps!

EDIT

I forgot the code to decode the image.

 public Bitmap decodeFile(Uri uriFile) throws OutOfMemoryError {
        String filePath = uriFile.getPath();
        BitmapFactory.Options bmOptions;
        Bitmap imageBitmap;
        try {
            imageBitmap = BitmapFactory.decodeFile(filePath);
        } catch (OutOfMemoryError e) {
            bmOptions = new BitmapFactory.Options();
            bmOptions.inSampleSize = 4;
            bmOptions.inPurgeable = true;
            imageBitmap = BitmapFactory.decodeFile(filePath, bmOptions);
        }
        return imageBitmap;
    }

The bmOptions ensure that OutOfMemoryError doesn't occurs.