code: public static Intent newPickFileIntent() {
          Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
          intent.setType("file/*");
          return intent;
      }
docs: Pick file from sdcard with file manager. Chosen file can be obtained from Intent in onActivityResult.
  See code below for example:
  <p/>
  <pre><code>
  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  Uri file = data.getData();
  }
  </code></pre>