<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".MainActivity" >
 
 <Switch
  android:id="@+id/swOnOfOff"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_alignParentTop="true"
  android:layout_centerHorizontal="true"
  android:layout_marginTop="30dp"
  android:textOn="開(kāi)啟"
  android:textOff="關(guān)閉"
  android:text="定時(shí)" />
 
 <LinearLayout
  android:id="@+id/llSelectTime"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_marginTop="50dp"
  android:padding="40dp"
  android:visibility="gone"
  android:orientation="horizontal" >
 
  <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_weight="2"
   android:gravity="right"
   android:text="時(shí)間  " />
 
  <TextView
   android:id="@+id/tvSelectTime"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_weight="3"
   android:gravity="left"
   android:text="00：00" />
 </LinearLayout>
</RelativeLayout>

package com.example.time;
 
import java.util.TimerTask;
 
import android.util.Log;
 
public class Task extends TimerTask{
 
 @Override
 public void run() {
 Log.i("wxy", "提示");
 
 }
 
}

package com.example.time;
 
import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
 
import android.os.Bundle;
import android.app.Activity;
import android.app.TimePickerDialog;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.CompoundButton;
import android.widget.LinearLayout;
import android.widget.Switch;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.CompoundButton.OnCheckedChangeListener;
 
public class MainActivity extends Activity implements OnClickListener {
 
 private LinearLayout llSelectTime; // 顯示選擇時(shí)間的一層
 private Switch swOnOfOff; // 開(kāi)關(guān)
 private TextView tvSelectTime;
 
 private Timer timer; // 定時(shí)器
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 
 llSelectTime = (LinearLayout) findViewById(R.id.llSelectTime);
 tvSelectTime = (TextView) findViewById(R.id.tvSelectTime);
 tvSelectTime.setOnClickListener(this);
 // 開(kāi)關(guān)點(diǎn)擊事件
 swOnOfOff = (Switch) findViewById(R.id.swOnOfOff);
 swOnOfOff.setOnCheckedChangeListener(new OnCheckedChangeListener() {
 
 @Override
 public void onCheckedChanged(CompoundButton compoundButton,
  boolean checked) {
 if (checked) {
  llSelectTime.setVisibility(View.VISIBLE); // 設(shè)置可見(jiàn)
 } else {
  llSelectTime.setVisibility(View.GONE); // 設(shè)置不可見(jiàn)，留了位置
  timer.cancel();// 關(guān)閉定時(shí)器
 }
 }
 });
 }
 
 @Override
 public void onClick(View view) {
 switch (view.getId()) {
 case R.id.tvSelectTime:
 // 顯示選擇時(shí)間對(duì)話框
 showSelectDailog();
 break;
 
 default:
 break;
 }
 }
 
 // 定時(shí)觸發(fā)事件
 private void timeTrigger(int hour, int minute) {
 Calendar calendar = Calendar.getInstance();
 calendar.set(Calendar.HOUR_OF_DAY, hour);
 calendar.set(Calendar.MINUTE, minute);
 calendar.set(Calendar.SECOND, 0);
 Date date = calendar.getTime(); // 第一次執(zhí)行任務(wù)的時(shí)間
 if (date.before(new Date())) { // 如果第一次執(zhí)行任務(wù)的時(shí)間小于當(dāng)前時(shí)間，那么要在執(zhí)行任務(wù)的時(shí)間加一天，否則會(huì)立即執(zhí)行
 date = this.addDay(date, 1);
 }
 Log.i("wxy", "date:" + date);
 timer = new Timer(true);
 timer.schedule(new Task(), date, 1000);//第一個(gè)參數(shù)為定時(shí)調(diào)用的方法，注意是一次性的，如果關(guān)閉Timer得重新實(shí)例化， 第二個(gè)參數(shù)為第一次調(diào)用的時(shí)間，第三個(gè)參數(shù)為兩次調(diào)用方法的間隔毫秒數(shù)
 
 }
 
 // 日期加一天
 public Date addDay(Date date, int num) {
 Calendar calendar = Calendar.getInstance();
 calendar.setTime(date);
 calendar.add(Calendar.DAY_OF_MONTH, num);
 return calendar.getTime();
 }
 
 // 顯示選擇時(shí)間對(duì)話框
 private void showSelectDailog() {
 OnTimeSetListener listener = new OnTimeSetListener() {
 // 選擇后返回的數(shù)據(jù)
 @Override
 public void onTimeSet(TimePicker arg0, int hour, int minute) {
 String time = "";// 時(shí)間字符串
 if (hour < 10) { // 如果小時(shí)小于10，在前邊添加0
  String h = "0" + hour;
  time += h;
 } else
  time += hour;
 time += ":";
 if (minute < 10) {
  String m = "0" + minute;
  time += m;
 } else {
  time += minute;
 }
 tvSelectTime.setText(time);
 // 定時(shí)觸發(fā)事件
 timeTrigger(hour, minute); // 觸發(fā)并傳遞獲取到的選擇的小時(shí)和分鐘，最為每天定時(shí)調(diào)用的時(shí)間
 }
 };
 TimePickerDialog dialog = new TimePickerDialog(this, listener, 0, 0,
 true); // 第三個(gè)參數(shù)為默認(rèn)時(shí)間，最后一個(gè)參數(shù)為是否24小時(shí)形式
 dialog.show();
 
 }
 
}