MainActivity.java 文件源码

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    final TextView textview = view.findViewById(R.id.text1);
    textview.setMovementMethod(ScrollingMovementMethod.getInstance());
    textview.setText(buildText());
    view.findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (v.getTag() == "") {
                textview.setText(buildText());
                v.setTag(null);
            } else {
                textview.setText(buildText2());
                v.setTag("");
            }
        }
    });
}