Pick an image from the image gallery in android?

Question

I am naive in android.I am facing a nuNullPointerException when i picking an image from the gallery.my code is following like that and getting error in cursor and filePathColumn[0]. What to do..

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == PICK_IMAGE && resultCode == RESULT_OK
            && null != data) {
        Uri selectedImage = data.getData();
        String[] filePathColumn = { MediaStore.Images.Media.DATA };

        Cursor cursor = getContentResolver().query(selectedImage,
                filePathColumn, null, null, null);
        cursor.moveToFirst();
        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        String picturePath = cursor.getString(columnIndex);
        cursor.close();

        decodeFile(picturePath);

    }
}

Answer 1

Complete Code for selecting image from gallery or taking picture from camera..100% working.

 protected static ImageView imPhoto;
        private static int RESULT_LOAD_IMG = 1;
        int REQUEST_CAMERA = 0, SELECT_FILE = 1;
        String selectedImagePath;


    @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.registration);

    imPhoto.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    selectImage();
                }
            });
    }

     private void selectImage() {

            final CharSequence[] items = {"Take Photo", "Choose from Library",
                    "Cancel"};

            AlertDialog.Builder builder = new AlertDialog.Builder(Registration.this);
            builder.setTitle("Add Photo!");
            builder.setItems(items, new DialogInterface.OnClickListener() {
                private DialogInterface dialog;
                private int item;

                @Override
                public void onClick(DialogInterface dialog, int item) {
                    this.dialog = dialog;
                    this.item = item;
                    if (items[item].equals("Take Photo")) {
                        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                        startActivityForResult(intent, REQUEST_CAMERA);
                    } else if (items[item].equals("Choose from Library")) {
                        Intent intent = new Intent(
                                Intent.ACTION_PICK,
                                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                        intent.setType("image/*");
                        startActivityForResult(
                                Intent.createChooser(intent, "Select File"),
                                SELECT_FILE);
                    } else if (items[item].equals("Cancel")) {
                        dialog.dismiss();
                    }
                }
            });
            builder.show();
        }


    ublic void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);

            if (resultCode == Activity.RESULT_OK) {
                if (requestCode == SELECT_FILE)
                    onSelectFromGalleryResult(data);
                else if (requestCode == REQUEST_CAMERA)
                    onCaptureImageResult(data);
            }
        }

        private void onCaptureImageResult(Intent data) {
            Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();
            thumbnail.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
            byte[] byteArray = bytes.toByteArray();
            File destination = new File(Environment.getExternalStorageDirectory(),
                    System.currentTimeMillis() + ".jpg");

            FileOutputStream fo;
            try {
                destination.createNewFile();
                fo = new FileOutputStream(destination);
                fo.write(bytes.toByteArray());
                fo.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

            imPhoto.setImageBitmap(thumbnail);
        }

        @SuppressWarnings("deprecation")
        private void onSelectFromGalleryResult(Intent data) {
            Uri selectedImageUri = data.getData();
            String[] projection = {MediaStore.MediaColumns.DATA};
            Cursor cursor = managedQuery(selectedImageUri, projection, null, null,
                    null);
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
            cursor.moveToFirst();

            selectedImagePath = cursor.getString(column_index);

            Bitmap bm;
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inJustDecodeBounds = true;
            BitmapFactory.decodeFile(selectedImagePath, options);
            final int REQUIRED_SIZE = 200;
            int scale = 1;
            while (options.outWidth / scale / 2 >= REQUIRED_SIZE
                    && options.outHeight / scale / 2 >= REQUIRED_SIZE)
                scale *= 2;
            options.inSampleSize = scale;
            options.inJustDecodeBounds = false;
            bm = BitmapFactory.decodeFile(selectedImagePath, options);

            imPhoto.setImageBitmap(bm);


        }