[移动开发]android ViewModel存储实例savedInstanceState

public class MainActivity extends AppCompatActivity {
    MyViewModel myViewModel;
    TextView textView;
    Button button1,button2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
      
  super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myViewModel= ViewModelProviders.of(this).get(MyViewModel.class);
        textView=findViewById(R.id.textView);
        textView.setText(String.valueOf(myViewModel.nuber));
        if (savedInstanceState!=null){
            String s=savedInstanceState.getString("MS");
            textView.setText(s);
        }
        button1=findViewById(R.id.button);
        button2=findViewById(R.id.button2);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                myViewModel.nuber++;
                textView.setText(myViewModel.nuber);
            }
        });
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                myViewModel.nuber+=2;
                textView.setText(myViewModel.nuber);
            }
        });
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putString("MS",textView.getText().toString());
    }
}