为什么 android 中没有显示时间选择器？

Question

时间选择器没有显示，我不知道出了什么问题。我认为问题在于 case 语句，我不知道我应该在 case 语句中写什么来显示时间选择器，这是我的源代码。请告诉我这里缺少什么？

public class MainActivity extends ActionBarActivity implements OnClickListener{
private Button btnStart,btnCalculate,btnTime;
static final int DATE_START_DIALOG_ID = 0;

private int mhourOfDay=0;
private int mminute=0;
boolean is24HourView2;


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    btnTime=(Button) findViewById(R.id.button2);
    btnTime.setOnClickListener(this);

}

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
        case TIME_START_DIALOG_ID:

    }


    return null;
}


//Time picker
private TimePickerDialog.OnTimeSetListener mTimeSetListener
        =new TimePickerDialog.OnTimeSetListener() {
    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {


        mhourOfDay=hourOfDay;
        mminute=minute;

         Toast.makeText(MainActivity.this,"hourOfDay is="+mhourOfDay+"minute="+mminute,Toast.LENGTH_LONG).show();

    }
};


public void onClick(View v) {
    // TODO Auto-generated method stub
    switch (v.getId()) {

        case R.id.button2:
            showDialog(TIME_START_DIALOG_ID);
            break;
       default:
            break;
   }
 }
}

Answer 1

您需要 return TimePickerDialog.OnTimeSetListener inside Switch 语句：

    @Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
        case TIME_START_DIALOG_ID:
            return new TimePickerDialog(this,mTimeSetListener, mHour, mMinute, false);
    }

    return null;
}

为什么 android 中没有显示时间选择器？

Why Time Picker is not showing in android?

android

datetimepicker