Android：如何保存活动中的更改？

Question

我有一个编辑器活动，用户可以在编辑文本和单选按钮中进行更改。我已经在编辑器活动中放置了FAB按钮＆＃34;当用户点击fab时，所有更改都应该保存＆＃34;但我不知道我怎么做到这一点。我从POJO得到的数据。提前谢谢。

    btnSave = (FloatingActionButton) findViewById(R.id.fab);
            radioGroup1 = (RadioGroup) findViewById(R.id.radio_group_broadcast);
            rbPub = (RadioButton)findViewById(R.id.radio_button_public);
            rbPri = (RadioButton)findViewById(R.id.radio_button_private);
            rbUnl = (RadioButton)findViewById(R.id.radio_button_unlisted);
            rbOnl = (RadioButton)findViewById(R.id.radio_button_logged_only);

    if (videoDetail.getBroadcast().contains("public")) {
                radioGroup1.check(R.id.radio_button_public);
            }
            else if (videoDetail.getBroadcast().contains("private")) {
                radioGroup1.check(R.id.radio_button_private);
            }
            else if (videoDetail.getBroadcast().contains("unlisted")) {
                radioGroup1.check(R.id.radio_button_unlisted);
            }
            else if (videoDetail.getBroadcast().contains("loggedin")) {
                radioGroup1.check(R.id.radio_button_logged_only);
            }

    radioGroup1.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(RadioGroup group, int checkedId) {

                    int selectedId = radioGroup1.getCheckedRadioButtonId();
                    rbPub = (RadioButton)findViewById(selectedId);
                    Toast.makeText(VideoEditorActivity.this, "Broadcast " + rbPub.getText().toString()
                    ,Toast.LENGTH_SHORT).show();
                }
           });

btnSave.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                //i think something need to do here
            }
        });