creating a drawable from sd card to set as a background in android

Question

I am trying to use an image from the sd card and set it as the background for a relativelayout. I have tried other solutions that i have found here and elsewhere but they h

Answer 1

I suggest checking that the drawable is being loaded correctly. Some things to try:

• Try using a different image on the sd card
• Put pic.png in R.drawable and make sure mRoot.setBackgroundResource() does what you expect
• After loading the drawable, check d.getBounds() to make sure it is what you expect

Answer 2

File file = new File( url.getAbsolutePath(), imageUrl);

                if (file.exists()) {

                    mDrawable = Drawable.createFromPath(file.getAbsolutePath());

                }

Answer 3

You do not load a drawable from SD card but a bitmap. Here is a method to load it with the reduced sampling (quality) so the program will not complain if the image is too large. Then I guess you need to process this bitmap i.e. crop it and resize for the background.

         // Read bitmap from Uri
     public Bitmap readBitmap(Uri selectedImage) {
         Bitmap bm = null;
         BitmapFactory.Options options = new BitmapFactory.Options();
         options.inSampleSize = 2; //reduce quality 
         AssetFileDescriptor fileDescriptor =null;
         try {
             fileDescriptor = this.getContentResolver().openAssetFileDescriptor(selectedImage,"r");
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         }
         finally{
             try {
                 bm = BitmapFactory.decodeFileDescriptor(fileDescriptor.getFileDescriptor(), null, options);
                 fileDescriptor.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
         return bm;
     }

The Uri here can be supplied from a gallery picker activity.

The image then can be saved into application resources and loaded into an imageView

        private void saveBackground(Bitmap Background) {
        String strBackgroundFilename = "background_custom.jpg";
        try {
            Background.compress(CompressFormat.JPEG, 80, openFileOutput(strBackgroundFilename, MODE_PRIVATE));
        } catch (Exception e) {
            Log.e(DEBUG_TAG, "Background compression and save failed.", e);
        }

        Uri imageUriToSaveCameraImageTo = Uri.fromFile(new File(BackgroundSettings.this.getFilesDir(), strBackgroundFilename));

        // Load this image
        Bitmap bitmapImage = BitmapFactory.decodeFile(imageUriToSaveCameraImageTo.getPath());
        Drawable bgrImage = new BitmapDrawable(bitmapImage);

        //show it in a view
        ImageView backgroundView = (ImageView) findViewById(R.id.BackgroundImageView);
        backgroundView.setImageURI(null); 
        backgroundView.setImageDrawable(bgrImage);
    }