Java 设置报警的时间选择器不工作，是否有其他修复方法？

目标是在从计时器中拾取时间并按下用于确认的ImageButton时设置报警。但是，当按下按钮设置报警时，什么也没有发生

该活动的Java代码为：

public class Time_Date extends FragmentActivity {

private PendingIntent pendingIntent;
private TimePicker alarmPicker;
AlarmManager alarmManager;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_time__date);
    alarmPicker = (TimePicker)findViewById(R.id.time);
    alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);



}



public void fireAlarm (View view)
{
    ImageButton alarmPower = (ImageButton)findViewById(R.id.setAlarm);
    alarmPower.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Calendar calendar = Calendar.getInstance();
            calendar.set(Calendar.HOUR_OF_DAY, 
alarmPicker.getCurrentHour());
            calendar.set(Calendar.MINUTE, 
alarmPicker.getCurrentMinute());
            Intent myIntent = new Intent(Time_Date.this, 
AlarmReceiver.class);
            pendingIntent = PendingIntent.getBroadcast(Time_Date.this, 
0, myIntent, 0);
            alarmManager.set(AlarmManager.RTC, 
calendar.getTimeInMillis(), pendingIntent);
        }
    });


}

XML布局代码是：

<LinearLayout 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"
android:orientation="vertical"
android:background="#FFFFFF"
tools:context="zyia.alarm.zyia.zyia.Time_Date">
<ImageView
    android:background="@drawable/top_bar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

<TimePicker
    android:id="@+id/time"
    android:layout_gravity="center"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"/>



<ImageButton
    android:layout_marginTop="15dp"
    android:id="@+id/setAlarm"
    android:onClick="fireAlarm"
    android:layout_gravity="center"
    android:layout_width="200dp"
    android:layout_height="150dp" />


</LinearLayout>

所用服务的代码为：

public class AlarmService extends IntentService {
private NotificationManager alarmNotificationManager;

public AlarmService() {
    super("AlarmService");
}

@Override
public void onHandleIntent(Intent intent) {
    sendNotification("Wake Up! Wake Up!");
}

private void sendNotification(String msg) {
    Log.d("AlarmService", "Preparing to send notification...: " + msg);
    alarmNotificationManager = (NotificationManager) this
            .getSystemService(Context.NOTIFICATION_SERVICE);

    PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
            new Intent(this, Time_Date.class), 0);

    NotificationCompat.Builder alamNotificationBuilder = new 
NotificationCompat.Builder(

this).setContentTitle("Alarm").setSmallIcon(R.drawable.ic_launcher)
            .setStyle(new NotificationCompat.BigTextStyle().bigText(msg))
            .setContentText(msg);


    alamNotificationBuilder.setContentIntent(contentIntent);
    alarmNotificationManager.notify(1, alamNotificationBuilder.build());
    Log.d("AlarmService", "Notification sent.");
}
}

---

我已经试了差不多一天了，找到了这个bug！任何帮助都将不胜感激

有两件事会成为潜在的问题：

设置闹钟时，请使用

AlarmManager.RTC_WAKEUP

，否则设备将无法从睡眠状态唤醒以触发闹钟

如果选择的时间早于一天中的当前时间，请确保适当调整日历对象。调用

Calendar.getInstance（）

时，您将得到一个

Calendar

对象，该对象被设置为设备的区域设置和时区的当前TOD。如果您在选择器中选择了当前TOD之前的时间，则不会触发警报，因为它将已经超过今天

---

还有一件事你需要注意：从KitKat开始，默认情况下警报是不精确的。因此，如果您需要在指定的确切时间发出警报，那么对于KK或更高版本的设备，您需要使用方法

AlarmManager.setExact（）

。

第一件事是可以的，但是如何适当调整日历对象？您必须查看选择器的时间是否在当前TOD之前。如果是，您需要在设置闹钟之前在

日历

对象中添加一天（使闹钟在明天选定的时间响起）

public class AlarmService extends IntentService {
private NotificationManager alarmNotificationManager;

public AlarmService() {
    super("AlarmService");
}

@Override
public void onHandleIntent(Intent intent) {
    sendNotification("Wake Up! Wake Up!");
}

private void sendNotification(String msg) {
    Log.d("AlarmService", "Preparing to send notification...: " + msg);
    alarmNotificationManager = (NotificationManager) this
            .getSystemService(Context.NOTIFICATION_SERVICE);

    PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
            new Intent(this, Time_Date.class), 0);

    NotificationCompat.Builder alamNotificationBuilder = new 
NotificationCompat.Builder(

this).setContentTitle("Alarm").setSmallIcon(R.drawable.ic_launcher)
            .setStyle(new NotificationCompat.BigTextStyle().bigText(msg))
            .setContentText(msg);


    alamNotificationBuilder.setContentIntent(contentIntent);
    alarmNotificationManager.notify(1, alamNotificationBuilder.build());
    Log.d("AlarmService", "Notification sent.");
}
}