Intent intent = new Intent();

if (Build.VERSION.SDK_INT < 19) {
    intent.setAction(Intent.ACTION_GET_CONTENT);
    intent.setType("image/*");
} else {
    intent = new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,"image/*");
}
activity.startActivityForResult(intent,1);