四个类中不带Dialog的都是对应的控件，带Dialog是相应的弹出的对话框，比如完成设置闹钟或者选择生日等应用中会用到。下面以TimePickerDialog为例介绍2中设置时间的方法：

1、谷歌sdk文档piker中介绍的一种方法：

　　<1>构建自己的Dilog类：　　　　

package com.example.user.spinnertest2;import android.app.Dialog;import android.app.TimePickerDialog;import android.os.Bundle;import android.support.v4.app.DialogFragment;import android.text.format.DateFormat;import android.widget.TimePicker;import java.util.Calendar;/** * Created by user on 2016/10/12. *///千万别导错了包public  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()));    }    @Override//执行选择时间后的操作    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {        // Do something with the time chosen by the user        System.out.println("成功"+hourOfDay+"haha"+minute);    }}

　　需要注意继承导入的包必须是import android.support.v4.app.DialogFragment;之前导入错误导致后面的主函数

timePickerFragment.show(getSupportFragmentManager(), "af")显示dialog时候总是出错，这主要是要兼容3.0前的设置

/要修改相应的activity继承android.support.v4.app.FragmentActivity;public class MainActivity extends FragmentActivity {// AppCompatActivity    private TimePickerFragment timePickerFragment;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        timePickerFragment = new TimePickerFragment();        //显示dialog        timePickerFragment.show(getSupportFragmentManager(), "af");            }    }

　　这里需要注意的是：修改显示dialog的activity继承android.support.v4.app.FragmentActivity;

2、直接创建dialog

 

TimePickerDialog timePickerDialog =new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener(){            @Override            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {                System.out.println("成功"+hourOfDay+"haha"+minute);            }        },  6, 60 ,        true); //构造设置的时间为默认的时间        timePickerDialog.show();