Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, 1);

Intent intent = new Intent(
  Intent.ACTION_PICK,
  android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
  intent.setType("image/*");
  PackageManager manager = getPackageManager();
  List<ResolveInfo> apps = manager.queryIntentActivities(intent,
   0);
  if (apps.size() > 0) {
   startActivityForResult(intent, 0x2001);
  }