如何在 android 中制作重启时不关闭的警报通知

Question

我想在 android 开始 3 天
发出通知警报在设定的日期和时间之后
我知道该怎么做，但是 phone 重启后通知不起作用
我想要闹钟管理器在 phone 重新启动之前记住设置的日期和时间
我该怎么做？我搜索了很多教程，但找不到一个，而且大多数教程都说将 boot_completed 放入广播接收器中，这不是解决方案。
有没有源码解释清楚的教程link？

我当前的应用代码如下

"manifest"

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.ynwa.finalalert"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="16"
        android:targetSdkVersion="22" />

    <!-- Permission to use AlarmManager -->
    <uses-permission android:name="com.android.alarm.permission.SET_ALARM" />
    <!-- Permission to Send SMS -->
    <uses-permission android:name="android.permission.SEND_SMS" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.ynwa.finalalert.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver
            android:name="com.ynwa.finalalert.AlertReceiver"
            android:enabled="true" />
    </application>

</manifest>

"MainActivity"

public class MainActivity extends AppCompatActivity {
Calendar calendar = Calendar.getInstance();
TextView display;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    display = (TextView) findViewById(R.id.textView);

    Button dateButton = (Button) findViewById(R.id.button);
    dateButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            new DatePickerDialog(MainActivity.this, listener, calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH)).show();

        }
    });
}
DatePickerDialog.OnDateSetListener listener = new DatePickerDialog.OnDateSetListener(){

    @Override
    public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {

        display.setText("Selected date is: " + dayOfMonth + "/" + (monthOfYear + 1) + "/" + year);

        calendar.set(Calendar.MONTH, monthOfYear);
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);

        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.AM_PM,Calendar.AM);

        Long alertTime = calendar.getTimeInMillis()+259200*1000;
        // Define a time value of 3 days after set date

        Intent alertIntent = new Intent(MainActivity.this, AlertReceiver.class);

        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

        alarmManager.set(AlarmManager.RTC_WAKEUP, alertTime,
                PendingIntent.getBroadcast(MainActivity.this, 1, alertIntent,
                        PendingIntent.FLAG_UPDATE_CURRENT));

    }
};}

"AlertReceiver"

public class AlertReceiver extends BroadcastReceiver{

@Override
public void onReceive(Context context, Intent intent) {

    createNotification(context, "Donation App", "You can donate now!", "Alert");

}

public void createNotification(Context context, String msg, String msgText, String msgAlert){

    PendingIntent notificIntent = PendingIntent.getActivity(context, 0,
            new Intent(context, MainActivity.class), 0);

    NotificationCompat.Builder mBuilder =
            new NotificationCompat.Builder(context)
                    .setSmallIcon(R.mipmap.ic_launcher)
                    .setContentTitle(msg)
                    .setTicker(msgAlert)
                    .setContentText(msgText);

    mBuilder.setContentIntent(notificIntent);

    mBuilder.setDefaults(Notification.DEFAULT_SOUND);

    mBuilder.setAutoCancel(true);

    NotificationManager mNotificationManager =
            (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

    mNotificationManager.notify(1, mBuilder.build());
}
}

Answer 1

您应该注册一个具有启动意图的接收器，并且start/restart您的闹钟在其中

<receiver android:name="BootIntentReceiver">  
        <intent-filter>  
            <action android:name="android.intent.action.BOOT_COMPLETED" />
        </intent-filter>  
</receiver>

你也需要添加这个权限

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

编辑：这里是官方参考

https://developer.android.com/training/scheduling/alarms.html#boot

By default, all alarms are canceled when a device shuts down. To prevent this from happening, you can design your application to automatically restart a repeating alarm if the user reboots the device. This ensures that the AlarmManager will continue doing its task without the user needing to manually restart the alarm.

如何在 android 中制作重启时不关闭的警报通知

how to make alarm notification that doesn't dismiss upon restart in android

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