Access pictures from Pictures app in my android app

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You can usestartActivityForResult, passing in an Intent that describes an action you want completed and and data source to perform the action on.

Luckily for you, Android includes an Action for picking things: Intent.ACTION__PICK and a data source containing pictures:
android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI for images on the local device or
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI for images on the SD card.

Call startActivityForResult passing in the pick action and the images you want the user to select from like this:

startActivityForResult(new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI), SELECT_IMAGE);

Then override onActivityResult to listen for the user having made a selection.

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  if (requestCode == SELECT_IMAGE)
    if (resultCode == Activity.RESULT_OK) {
      Uri selectedImage = data.getData();
      // TODO Do something with the select image URI
    } 
}

Once you have the image Uri you can use it to access the image and do whatever you need to do with it.

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