How to open file save dialog in android?

Question

I have a web service which give me a byte[] array according to image id . I want to convert these byte[] to file and store a file on android where user want like save file dialog box with file same format exactly it has.

Answer 1

Since this is the top result in google when you search for that topic and it confused me a lot when I researched it, I thought I add an update to this question. Since Android 19 there IS a built in save dialog. You dont event need any permission to do it (not even WRITE_EXTERNAL_STORAGE). The way it works is pretty simple:

//send an ACTION_CREATE_DOCUMENT intent to the system. It will open a dialog where the user can choose a location and a filename

Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("YOUR FILETYPE"); //not needed, but maybe usefull
intent.putExtra(Intent.EXTRA_TITLE, "YOUR FILENAME"); //not needed, but maybe usefull
startActivityForResult(intent, SOME_INTEGER);

...

//after the user has selected a location you get an uri where you can write your data to:

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
  if(requestCode == SOME_INTEGER && resultCode == Activity.RESULT_OK) {
    Uri uri = data.getData();

    //just as an example, I am writing a String to the Uri I received from the user:

    try {
      OutputStream output = getContext().getContentResolver().openOutputStream(uri);

      output.write(SOME_CONTENT.getBytes());
      output.flush();
      output.close();
    }
    catch(IOException e) {
      Toast.makeText(context, "Error", Toast.LENGTH_SHORT).show();
    }
  }
}

More here: https://developer.android.com/guide/topics/providers/document-provider