Question

我想要的是：按钮文字现在是“08:00”。单击按钮时，它会显示一个时间戳。所选时间设置为按钮文本。（报警应用程序）。我已经阅读了一些关于此的教程和问题答案，但还没有找到答案。按下时钟按钮后，应用程序崩溃。如果我把onCreateView部分放在评论中就行了。它说：android.util.AndroidRuntimeException：在添加内容之前必须调用requestFeature（）。

public class TimeSet extends DialogFragment implements TimePickerDialog.OnTimeSetListener {

    private Button clock;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current time as the default values for the picker
        final Calendar c = Calendar.getInstance();
        int hour = c.get(Calendar.HOUR_OF_DAY);
        int minute = c.get(Calendar.MINUTE);

        // Create a new instance of TimePickerDialog and return it
        return new TimePickerDialog(getActivity(), this, hour, minute,
                DateFormat.is24HourFormat(getActivity()));
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

        // R.layout.my_layout - that's the layout where your textview is placed
        View view = inflater.inflate(R.layout.listview_item_row, container, false);
        clock = (Button)view.findViewById(R.id.ora);
        // you can use your textview.
        return view;
    }

    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        // Do something with the time chosen by the user
        clock.setText(new StringBuilder().append(hourOfDay).append(":").append(minute));
    }

}

Answer 1

来自评论

When clicks the button it shows a timepicker. The user select the time and the time chosen is showed as the buttons text (alarm app).

无需夸大布局。

http://developer.android.com/guide/topics/ui/controls/pickers.html

使用界面作为对活动的回电。

在按钮上单击显示DialogFragment。使用界面。在Activity中实现相同的操作并将时间设置为按钮

public class TimePickerFragment extends DialogFragment
implements TimePickerDialog.OnTimeSetListener {
    public interface PickTime
    {
        public void returnTime(String value);

    }

    PickTime mCallback;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current time as the default values for the picker
    mCallback = (PickTime) getActivity();
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);

// Create a new instance of TimePickerDialog and return it
return new TimePickerDialog(getActivity(), this, hour, minute,
DateFormat.is24HourFormat(getActivity()));
}

public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
// Do something with the time chosen by the user

    if(mCallback!=null)
    {
        StringBuilder sb = new StringBuilder();
        sb.append(hourOfDay);
        sb.append(":");
        sb.append(minute);
        mCallback.returnTime(sb.toString());
    }
}
}

在您的活动中

public class MainActivity extends ActionBarActivity implements PickTime{

    Button button;
    TimePickerFragment newFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) findViewById(R.id.button1)
        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                  newFragment = new TimePickerFragment();
                  newFragment.show(getSupportFragmentManager(), "timePicker");

               }
            });
    }
    @Override
    public void returnTime(String value) {
        // TODO Auto-generated method stub
        button.setText(value);

    }

}

Android，通过DialogFragment到达按钮？

1 个答案: