android中 dialog显示TimePickerDialog

package com.dialog;import android.app.Activity;import android.app.Dialog;import android.app.TimePickerDialog;import android.os.Bundle;import android.widget.TimePicker;import android.widget.Toast;public class dialogdatetume extends Activity {int hour, minute1;    static final int TIME_DIALOG_ID = 0;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.datetimepicker);        showDialog(TIME_DIALOG_ID);    }@Overrideprotected Dialog onCreateDialog(int id) {// TODO Auto-generated method stub//return super.onCreateDialog(id);switch (id) {        case TIME_DIALOG_ID:             return new TimePickerDialog( this, mTimeSetListener, hour, minute1, false);    }    return null; }   private TimePickerDialog.OnTimeSetListener mTimeSetListener =    new TimePickerDialog.OnTimeSetListener()    {@Overridepublic void onTimeSet(TimePicker view, int hourOfDay, int minute) {// TODO Auto-generated method stub hour = hourOfDay;           minute1 = minute;              Toast.makeText(getBaseContext(),                 "You have selected : " + hour + ":" + minute1,                Toast.LENGTH_SHORT).show();}    };}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    >     <TimePicker        android:layout_width="wrap_content"        android:layout_height="wrap_content" />             </LinearLayout>

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