Android - 从图库应用程序获取图像？

Question

I need to be able to get an image from the gallery when the user clicks on a button.

Since there are heaps of answers to this, my question is how can I do this, set the selected image to a RelativeLayout and this RelativeLayout is in another Class.

My project is set out like this: I have my SettingsActivity which is where the button is, and my MainActivity where the wallpaper is located. I need the image to set to the RelativeLayout when the user navigates back to the MainActivity.

Code I have tried:

SettingsActivity:

changeWallpaper.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view1)
        {
            Intent i = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            startActivityForResult(i, RESULT_LOAD_IMAGE);
        }
    });
....
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == RESULT_LOAD_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();

        editor.putBoolean(SETWALLPAPER, wallpaperSelection);
        editor.commit();
    }
}

MainActivity:

isWallpaper = prefs.getBoolean(SETWALLPAPER, false);
...
if(isWallpaper == true)
    {
        Toast.makeText(MainActivity.this, "Setting BG", Toast.LENGTH_LONG).show();
        wallpaperView.setBackgroundDrawable(new BitmapDrawable(bitmap));
    }

Thanks

Answer 1

Looks like you are not setting your picture on selecting the picture but inside onCreate()

Put your if(..){} inside the onActivityResult() method and see.

Let me know if it works. Use else and try to see result. See if the if code runs?

Answer 2

MainActivity do nothing is because the activity doesn't know what user selected

on SettingActivity onActivityResult , you may store picturePath in SharedPreferences

on MainActivity onResume , try to get the path of image and convert it to Bitmap and set it as backgroud drawable