現在普遍的手機都會有一個鬧鐘的功能，如果使用Android來實現一個鬧鐘可以使用AtarmManager來實現。AtarmManager提供了一種系統級的提示服務，允許你安排在將來的某個時間執行一個服務。AlarmManager對象一般不直接實例化，而是通過Context.getsystemservice(Context.ALARM_SERVICE）方法獲得。
下面是我們運用之前用到的TimePickerDialog結合AlarmManager，實現一個可以設定任意時間而且可以重復的鬧鐘，演示效果如下（大概每晚23:48會有鬧鐘通知）：
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout 3 xmlns:android="http://schemas.android.com/apk/res/android" 4 xmlns:tools="http://schemas.android.com/tools" 5 android:id="@+id/activity_main" 6 android:layout_width="match_parent" 7 android:layout_height="match_parent" 8 android:orientation="vertical" 9 tools:context="com.example.administrator.alarmdemo.MainActivity"> 10 <TextView 11 android:id="@+id/time_tv" 12 android:layout_width="match_parent" 13 android:layout_height="wrap_content" 14 android:hint="請設置鬧鈴時間" 15 android:clickable="true" 16 android:onClick="setTime" 17 android:gravity="center"/> 18 <TextView 19 android:id="@+id/time_tv2" 20 android:layout_width="match_parent" 21 android:layout_height="wrap_content" 22 android:hint="請設置響鈴間隔時間" 23 android:clickable="true" 24 android:onClick="setIntervalTime" 25 android:gravity="center"/> 26 <Button 27 android:layout_width="match_parent" 28 android:layout_height="wrap_content" 29 android:onClick="open" 30 android:text="開啟鬧鐘"/> 31 <Button 32 android:layout_width="match_parent" 33 android:layout_height="wrap_content" 34 android:onClick="stop" 35 android:text="結束鬧鐘"/> 36 </LinearLayout>
1 <?xml version="1.0" encoding="utf-8"?> 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android" 3 package="com.example.administrator.alarmdemo"> 4 <application 5 android:allowBackup="true" 6 android:icon="@mipmap/ic_launcher" 7 android:label="@string/app_name" 8 android:supportsRtl="true" 9 android:theme="@style/AppTheme"> 10 <activity android:name=".MainActivity"> 11 <intent-filter> 12 <action android:name="android.intent.action.MAIN" /> 13 14 <category android:name="android.intent.category.LAUNCHER" /> 15 </intent-filter> 16 </activity> 17 <receiver 18 android:name=".RepeatAlarmReceiver" 19 android:enabled="true" 20 android:exported="true"> 21 <intent-filter> 22 <action android:name="repeatAlarm" /> 23 </intent-filter> 24 </receiver> 25 <activity android:name=".Main2Activity"></activity> 26 </application> 27 28 </manifest>
1 import android.content.BroadcastReceiver;
2 import android.content.Context;
3 import android.content.Intent;
4 import android.widget.Toast;
5
6 public class RepeatAlarmReceiver extends BroadcastReceiver {
7 public RepeatAlarmReceiver() {
8 }
9 @Override
10 public void onReceive(Context context, Intent intent) {
11 Toast.makeText(context, "重復鬧鐘", Toast.LENGTH_SHORT).show();
12 }
13 }
1 import android.app.AlarmManager;
2 import android.app.PendingIntent;
3 import android.app.TimePickerDialog;
4 import android.content.Intent;
5 import android.provider.Settings;
6 import android.support.v7.app.AppCompatActivity;
7 import android.os.Bundle;
8 import android.view.View;
9 import android.widget.TextView;
10 import android.widget.TimePicker;
11 import java.util.Calendar;
12 public class MainActivity extends AppCompatActivity {
13 AlarmManager alarmManagerSet;
14 PendingIntent pendingIntentSet;
15 int myHour,myMinute;//聲明響鈴時間
16 int intervalHour,intervalMinute,intervalSecond;//聲明間隔時間（響鈴周期）
17 Calendar calendar;//聲明日歷
18 TextView time_tv,time_tv2;
19
20 @Override
21 protected void onCreate(Bundle savedInstanceState) {
22 super.onCreate(savedInstanceState);
23 setContentView(R.layout.activity_main);
24 alarmManagerSet= (AlarmManager) getSystemService(ALARM_SERVICE);
25 //設置聲明時間格式
26 calendar = Calendar.getInstance();
27 myHour=calendar.get(Calendar.HOUR_OF_DAY);
28 myMinute=calendar.get(Calendar.MINUTE);
29 intervalHour=calendar.get(Calendar.HOUR_OF_DAY);
30 intervalMinute=calendar.get(Calendar.MINUTE);
31 //獲取時間設置的TextView
32 time_tv= (TextView) findViewById(R.id.time_tv);
33 time_tv2= (TextView) findViewById(R.id.time_tv2);
34 }
35 //使用timePickerDialog設置鬧鈴響鈴時間
36 public void setTime(View view){
37 TimePickerDialog timePickerDialog =new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
38 @Override
39 public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
40 myHour=hourOfDay;
41 myMinute=minute;
42 time_tv.setText(myHour+":"+myMinute);
43 }
44 },myHour,myMinute,true);
45 timePickerDialog.show();
46 }
47 //使用timePickerDialog設置鬧鈴響鈴周期（間隔）
48 public void setIntervalTime(View view){
49 TimePickerDialog timePickerDialog =new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() {
50 @Override
51 public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
52 intervalHour=hourOfDay;
53 intervalMinute=minute;
54 time_tv2.setText(intervalHour+":"+intervalMinute);
55 }
56 },intervalHour,intervalMinute,true);
57 timePickerDialog.show();
58 }
59 public void open(View view){
60 //分別獲取鬧鈴響鈴時間以及鬧鈴間隔時間（用冒號分割存儲於數組中）
61 String[] triggerTime=time_tv.getText().toString().split(":");
62 String[] intervalTime=time_tv2.getText().toString().split(":");
63 //通過Calendar分別獲取對應的小時和分鐘（需要將String轉換為int）
64 Calendar calendar1 = Calendar.getInstance();
65 calendar1.set(Calendar.HOUR_OF_DAY,Integer.parseInt(triggerTime[0]));
66 calendar1.set(Calendar.MINUTE,Integer.parseInt(triggerTime[1]));
67 //得到點擊觸發的毫秒值（即鬧鐘提醒時間）
68 long triggerAtMillis= calendar1.getTimeInMillis();
69 //設定pendinngIntent接受自定義鬧鈴廣播
70 pendingIntentSet = PendingIntent.getBroadcast(this,0,new Intent("repeatAlarm"),0);
71 //判斷如果當前系統時間大於設置的鬧鈴時間，則在第二天開始啟用該鬧鈴
72 if(System.currentTimeMillis()>triggerAtMillis){
73 triggerAtMillis=triggerAtMillis+24*60*60*1000;
74 }
75 //使用.setRepeating設置重復鬧鈴
76 alarmManagerSet.setRepeating(AlarmManager.RTC_WAKEUP,triggerAtMillis,intervalMillis,pendingIntentSet);
77 }
78 public void stop(View v){
79 alarmManagerSet.cancel(pendingIntentSet);
80 }
81 }
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