Question

大家好，我正在尝试了解如何在Android中使用AlarmManager和BroadcastReceiver。我在使用AlarmManager时遇到了一些问题：我在1分钟的距离设置两个警报，但只有一个发出警报，并且延迟了几分钟（我猜不可预测）。

这是我的主要活动（我通过点击按钮设置警报）

public class MainActivity extends AppCompatActivity {
    AlarmManager alarmManager;
    Intent intent;
    PendingIntent pendingIntent;
    AtomicInteger atomicInteger;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        intent = new Intent(Constants.EXTENDED_DATA_STATUS);
        atomicInteger = new AtomicInteger();
        setContentView(R.layout.activity_main);

        Button startButton = (Button) findViewById(R.id.start_button);

        startButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int id = atomicInteger.incrementAndGet();
                pendingIntent = PendingIntent.getBroadcast(getApplicationContext(),id,intent,0);
                Calendar firstLullo = Calendar.getInstance();
                Calendar secondLullo = Calendar.getInstance();
                firstLullo.set(Calendar.HOUR_OF_DAY,10);
                firstLullo.set(Calendar.MINUTE,55);
                secondLullo.set(Calendar.HOUR_OF_DAY,10);
                secondLullo.set(Calendar.MINUTE,56);
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                    alarmManager.setExact(AlarmManager.RTC_WAKEUP,firstLullo.getTimeInMillis(),pendingIntent);
                    alarmManager.setExact(AlarmManager.RTC_WAKEUP,secondLullo.getTimeInMillis(),pendingIntent);
                }
                Log.d("ALARM","settato con id " + String.valueOf(id));
            }
        });
    }
}

我的接收器只显示一个Toast并使手机振动。 Constants.EXTENDED_DATA_STATUS是来自Constants类的字符串，并且已添加到Android Manifest中我的Reveiver的intent-filter。

我缺少什么？我google了很多，发现我必须使用setExact()，但没有运气..

提前致谢

Answer 1

只有一次火灾的原因是你的取消你的第一个总是

来自文档：如果已经为同一个IntentSender安排了警报，那么先前的警报将被取消。

要解决此问题，请对两个警报使用不同的PendingIntents。

- 要让您的接收方激活多次次，请在{//export firstgrid Response.ClearContent(); Response.ClearHeaders(); DataTable dtGetReportBank = new DataTable(); dtGetReportBank = objPO.GetReportBank(id); gridData1.DataSource = dtGetReportBank; gridData1.DataBind(); Response.ClearContent(); Response.Buffer = true; Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "BankCMS" + ".xls")); Response.ContentType = "application/ms-excel"; StringWriter sw1 = new StringWriter(); HtmlTextWriter htw1 = new HtmlTextWriter(sw1); gridData1.AllowPaging = false; dvContent.RenderControl(htw1); Response.Write(sw1.ToString()); Response.End(); Btn.Visible = false; } //export second grid { Response.ClearContent(); Response.ClearHeaders(); DataTable dtGetReportBank = new DataTable(); dtGetReportBank = objPO.GetReportBank(id); gridData.DataSource = dtGetReportBank; gridData.DataBind(); Response.ClearContent(); Response.Buffer = true; Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "BankCMS" + ".xls")); Response.ContentType = "application/ms-excel"; StringWriter sw1 = new StringWriter(); HtmlTextWriter htw1 = new HtmlTextWriter(sw1); gridData.AllowPaging = false; dvContent.RenderControl(htw1); Response.Write(sw1.ToString()); Response.End(); Btn.Visible = false; }

中重新安排

示例： 只有你想要两个接收器彼此分开！

onReceive()

在 Manifest.XML ：
中注册闹钟
//Declare AlarmManager AlarmManager am = (AlarmManager) LayoutActivity.this.getSystemService(ALARM_SERVICE); //create new calendar instance for your first alarm Calendar startTime= Calendar.getInstance(); //set the time of your first alarm firstLullo.set(Calendar.HOUR_OF_DAY,10); firstLullo.set(Calendar.MINUTE, 55); firstLullo.set(Calendar.SECOND, 0); //create a pending intent PendingIntent firstPI = PendingIntent.getBroadcast(yourActivity.this, 0, new Intent("yourFirstAlarmReceiver"), PendingIntent.FLAG_UPDATE_CURRENT); //schedule time for pending intent, and set the interval to day so that this event will repeat at the selected time every day am.setRepeating(AlarmManager.RTC_WAKEUP, firstAlarm.getTimeInMillis(), firstPI); //---------------------------------------------------- //create new calendar instance for your second alarm Calendar endCalender = Calendar.getInstance(); //Set the time alarm of your second alarm secondLullo.set(Calendar.HOUR_OF_DAY,10); secondLullo.set(Calendar.MINUTE,56); secondLullo.set(Calendar.SECOND, 0); //create a pending intent to be PendingIntent secondPI= PendingIntent.getBroadcast(yourActivity.this, 0, new Intent("yourSecondAlarmReceiver"), PendingIntent.FLAG_UPDATE_CURRENT); //schedule time for pending intent, and set the interval to day so that this event will repeat at the selected time every day am.setRepeating(AlarmManager.RTC_WAKEUP, secondLullo.getTimeInMillis(), secondPI);

现在，您可以通过以下方式拨打闹钟：

第一次警报：

<receiver android:name="firstAlarm" > <intent-filter> <action android:name="yourFirstAlarmReceiver" > </action> </intent-filter> </receiver> <receiver android:name="secondAlarm" > <intent-filter> <action android:name="yourSecondAlarmReceiver" > </action> </intent-filter> </receiver>

第二次警报：

public class yourFirstAlarmReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { //Do something when first alarm goes off } }

应该帮助你。

Answer 2

是的，当然上面的代码只会触发一个警报，因为你为两个警报设置相同的id。

警报由pendingintent中的id识别和区分。

为不同的警报使用不同的ID

更新代码：

pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 1234 ,intent,0);
alarmManager.setExact(AlarmManager.RTC_WAKEUP,firstLullo.getTimeInMillis(),pendingIntent);

pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 5678, intent,0);
alarmManager.setExact(AlarmManager.RTC_WAKEUP,secondLullo.getTimeInMillis(),pendingIntent);

AlarmManager触发较晚或根本不触发

2 个答案: