小编Joe*_*Joe的帖子

这只是一个基本的问答应用.当我试图radiobutton在应用程序界面上按下时,我收到错误.这是我的主要课程:

public class Balance extends AppCompatActivity {

private int score = 0; //answer score
private int PreviousScore;
private int i = 0;
private Vibrator myVib;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_balance);

    final TextView Score = (TextView) findViewById(R.id.Score);
    Button b = (Button)findViewById(R.id.button); //button

    myVib = (Vibrator) this.getSystemService(VIBRATOR_SERVICE);


    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


    question(); //call params for question

    //button listener, when button clicked, produce output on textfield "Score"
    b.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) { …