FragmentDemoInteraction.java 文件源码

/**
 * Append results on the main thread.
 */
private void appendText(@Nullable final String words) {

    if (getActivity() != null) {
        new Handler(Looper.getMainLooper()).post(new Runnable() {
            @Override
            public void run() {
                if (words != null) {
                    tvResults.append("\n" + words);
                } else {
                    tvResults.setText("");
                }
            }
        });
    }
}