android - TimePickerDialog 未显示/显示

Question

我有一个 TimePickerDialog，我想在用户按下按钮时向其显示，以便她可以选择一个时间来设置显示(当前时间以外的某个时间)。当前，当按下按钮时，当前时间显示在 TextView 和 Toast 中。屏幕也会变暗，屏幕中央会出现一个小框。 TimePickerDialog 不向用户显示。

这是代码；

import java.util.Calendar;
import android.os.Bundle;
import android.app.Activity;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentActivity;
import android.text.format.DateFormat;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.Toast;

public class AddAlarmActivity extends FragmentActivity implements TimePickerDialog.OnTimeSetListener, TimePickerDialog.OnDismissListener {

Button setTime;
public int hour_local;
public int minute_local;
public Dialog onCreateDialog;
public TimePicker timePicker;
public TextView displayAlarm;

static final int TIME_DIALOG_ID = 999;

@Override
public void onCreate(final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_add_alarm);
    //add a TextView thing to this part

    setTime = (Button) findViewById(R.id.button_set_time);
    displayAlarm = (TextView) findViewById(R.id.tvDisplayTime);

    setTime.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            onCreateDialog(savedInstanceState);
            showTimePickerDialog(timePicker);
            displayAlarm.setText(hour_local + ":" + minute_local);
        }
    }); 


}

public Dialog onCreateDialog(Bundle savedInstanceState) {
    // Use the current time as the default values for the picker

    final Calendar c = Calendar.getInstance();
    hour_local = c.get(Calendar.HOUR_OF_DAY);
    minute_local = c.get(Calendar.MINUTE);

    Context context = getApplicationContext();
    CharSequence text = hour_local + ":" + minute_local;
    int duration = Toast.LENGTH_LONG;

    Toast toast = Toast.makeText(context, text, duration);
    toast.show();

    // Create a new instance of TimePickerDialog and return it
    return new TimePickerDialog(getApplicationContext(), this, hour_local, minute_local,
            DateFormat.is24HourFormat(getApplicationContext()));
}

public void showTimePickerDialog(View v) {
    DialogFragment newFragment = new DialogFragment();
    newFragment.show(getSupportFragmentManager(), "timePicker");
}


public void onDismiss(DialogInterface dialog){

    System.out.println("oui c'est très bon !");

}

public void onTimeSet(TimePicker view, int hour_l, int minute_l) {
   hour_local = hour_l;
   minute_local = minute_l;
    System.out.println("voila");
}
}

Answer 1

我建议您遵循开发者网站的做法:

• 创建一个处理对话 fragment 的静态类

  public static class TimePickerFragment extends DialogFragment
                          implements TimePickerDialog.OnTimeSetListener {
  
  @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()));
  }
  
  public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
      // Do something with the time chosen by the user
  }
  }
  

• 在点击监听器的按钮中调用此方法:

  public void showTimePickerDialog(View v) {
      DialogFragment newFragment = new TimePickerFragment();
      newFragment.show(getSupportFragmentManager(), "timePicker");
  }
  

来源here .