Android: How to set the photo selected from galler

问题:

I am asking the user for the access to the gallery through the code as a listener here:

Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, SELECT_PHOTO);

However, I am confused as to how I would set a variable to the photo selected.

Where would I put the code to set a variable as the photo selected?

Thanks :)

回答1:

You can do it like this.

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

    // Here we need to check if the activity that was triggers was the Image Gallery.
    // If it is the requestCode will match the LOAD_IMAGE_RESULTS value.
    // If the resultCode is RESULT_OK and there is some data we know that an image was picked.
    if (requestCode == LOAD_IMAGE_RESULTS && resultCode == RESULT_OK && data != null) {
        // Let's read picked image data - its URI
        Uri pickedImage = data.getData();
        // Let's read picked image path using content resolver
        String[] filePath = { MediaStore.Images.Media.DATA };
        Cursor cursor = getContentResolver().query(pickedImage, filePath, null, null, null);
        cursor.moveToFirst();
        String imagePath = cursor.getString(cursor.getColumnIndex(filePath[0]));

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
        Bitmap bitmap = BitmapFactory.decodeFile(imagePath, options);

         // Do something with the bitmap


        // At the end remember to close the cursor or you will end with the RuntimeException!
        cursor.close();
    }
}

回答2:

First you have to override onActivityResult to get the uri of the file selected image

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == SELECT_PHOTO) {

        if (resultCode == RESULT_OK) {
            if (intent != null) {
                // Get the URI of the selected file
                final Uri uri = intent.getData();
                useImage(uri);                   
              }
        }
       super.onActivityResult(requestCode, resultCode, intent);

    }
}

Then define useImage(Uri) to use the image

void useImage(Uri uri)
{
 Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri);
 //use the bitmap as you like
 imageView.setImageBitmap(bitmap);
}

回答3:

Alternative for Akash Kurian Jose answer

Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uri);

I always use

fun getBitmap(file: Uri, cr: ContentResolver): Bitmap?{
            var bitmap: Bitmap ?= null
            try {
                val inputStream = cr.openInputStream(file)
                bitmap = BitmapFactory.decodeStream(inputStream)
                // close stream
                try {
                    inputStream.close()
                } catch (e: IOException) {
                    e.printStackTrace()
                }

            }catch (e: FileNotFoundException){}
            return bitmap
        }

It works both for photos from gallery and photos from camera.

Larger issue about it: Picasso unable to display image from Gallery

Open Gallery using this method:

private void openGallery(){
    if (Build.VERSION.SDK_INT <19){
        Intent intent = new Intent(); 
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent, getResources().getString(R.string.select_picture)),GALLERY_INTENT_CALLED);
    } else {
        Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType("image/*");
        startActivityForResult(intent, GALLERY_KITKAT_INTENT_CALLED);
    }
}

Then you are able to read convert Uri to Bitmap using afromentioned ContentResolver.openInputStream or set image ImageView.setImageUri(Uri)

回答4:

If you want to display the selected image to any particular ImageView. Suppose we have RC_PHOTO_PICKER = 1 then these lines of code should do the magic

private void openPhotoPicker() {
    Intent photoPickerIntent = new Intent(Intent.ACTION_GET_CONTENT);
    photoPickerIntent.setType("image/*");
    photoPickerIntent.putExtra(Intent.EXTRA_LOCAL_ONLY, false);
    startActivityForResult(Intent.createChooser(photoPickerIntent,"Complete Action Using"), RC_PHOTO_PICKER);
}

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

    if (requestCode == RC_PHOTO_PICKER && resultCode == RESULT_OK && data != null) {
        Uri pickedImage = data.getData();
        //set the selected image to ImageView
        mImageView.setImageURI(pickedImage);
    }
}

And simply call the openPhotoPicker() method afterwards