Question

我正在尝试使用Calendar和AlarmManager在特定时间发送推送通知，但是一旦到达指定时间，就不会发送任何通知。

我看过其他有关如何执行此操作的教程，我已经直接关注了它们，但似乎都没有用。

我也试图将我的NotificationReceiver类包含在AndroidManifest.xml文件中，但是我收到一条错误消息，指出该类不可分配给android.app.Activity。

但是，我无需使用AlarmManager就可以使它正常工作。

RepeatingActivity是在单击通知后重定向用户的位置，它是一个琐碎的活动，上面带有一个简单的文本框。

MainActivity.java

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

}

public void sendNotification(View view) {
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY, 13);
    calendar.set(Calendar.MINUTE, 14);
    calendar.set(Calendar.SECOND, 0);

    Intent intent = new Intent(getApplicationContext(), 
        NotificationReceiver.class);
    PendingIntent pendingIntent = 
        PendingIntent.getBroadcast(getApplicationContext(),
                100, intent, PendingIntent.FLAG_UPDATE_CURRENT);

    AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, 
        calendar.getTimeInMillis(),
        AlarmManager.INTERVAL_DAY, pendingIntent);

}

NotificationReceiver.java

public class NotificationReceiver extends BroadcastReceiver {

    // Called when class gets triggered
    @Override
    public void onReceive(Context context, Intent intent) {
        NotificationManager notificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);

        Intent repeatIntent = new Intent(context, RepeatingActivity.class);
        repeatIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 

        PendingIntent pendingIntent = PendingIntent.getActivity(context,
                100, repeatIntent, PendingIntent.FLAG_UPDATE_CURRENT);

        NotificationCompat.Builder builder = new 
            NotificationCompat.Builder(context)
                .setContentIntent(pendingIntent)
                .setSmallIcon(android.R.drawable.arrow_up_float)
                .setContentTitle("Notification Title")
                .setContentText("Notification Text")
                .setAutoCancel(true); 

        // Create channel for notification
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel channel = new NotificationChannel("channelID", 
                "name", importance);
            notificationManager.createNotificationChannel(channel);
            builder.setChannelId("channelID");
        }

        notificationManager.notify(100, builder.build());
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <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"
        tools:context="com.jessicathornsby.myapplication.MainActivity">

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="sendNotification"
            android:text="Do it!" />
    </LinearLayout>

</android.support.constraint.ConstraintLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.family.lagoc.myapplication">

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

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

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

        <activity android:name=".RepeatingActivity"></activity>
    </application>

</manifest>

当我加入这一行时： <activity android:name=".NotificationReceiver"></activity>，我收到此错误： com.family.lagoc.myapplication.NotificationReceiver is not assignable to android.app.Activity

用户单击activity_main.xml文件上的按钮，然后在指定的时间设置警报（我将其硬编码在其中，仅用于测试目的）。但是，我希望那时能收到通知，但什么也没收到。

尝试在特定时间发送推送通知时遇到问题

0 个答案: