java - 广播接收器不起作用

Question

我正在尝试根据手册创建一些简单的BroadcastReceiver，但我无法使其工作。我在 MainActivity 的 onCreate 函数中调用过程 setAlarm，如下所示:

private void setAlarm() {
Intent intent = new Intent(MainActivity.this, AlarmReceiver.class);
AlarmManager manager = (AlarmManager) getSystemService(ALARM_SERVICE);
PendingIntent pendingIntent = PendingIntent.getService(this, 0, intent, 0);
manager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+1000, pendingIntent);
}

它应该激活 AlarmReceiver，它应该执行一些操作，但不执行任何操作。它看起来像这样:

public class AlarmReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
    Toast.makeText(context, "I'm running", Toast.LENGTH_LONG).show();
    notifikace(context);
    }

public void notifikace(Context context) {
    NotificationCompat.Builder mBuilder = new     NotificationCompat.Builder(context);
    mBuilder.setSmallIcon(R.drawable.notifikace);
    mBuilder.setContentTitle("Notification Alert, Click Me!");
    mBuilder.setContentText("aaa");
    NotificationManager mNotificationManager = (NotificationManager)  context.getSystemService(context.NOTIFICATION_SERVICE);
    mNotificationManager.notify(2, mBuilder.build());
    }
}

我怀疑我在 AndroidManifest 中遗漏了一些东西，但我不知道是什么。 AndroidManifest 看起来像这样:

<?xml version="1.0" encoding="utf-8"?>

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

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">

    <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".Nastaveni"
        android:label="@string/title_activity_nastaveni"
        android:theme="@style/AppTheme.NoActionBar" />
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />

    <activity
        android:name=".Tyden"
        android:label="@string/title_activity_tyden"
        android:theme="@style/AppTheme.NoActionBar"></activity>
    <receiver android:name=".AlarmReceiver" >
    </receiver>
</application>

最终，即使应用程序当前未运行，应用程序也应该能够每天在特定时间发送通知。 (我将不得不更换

manager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+1000, pendingIntent);

与 setRepeating 函数一致，但到目前为止，出于测试目的，我需要首先让它运行。)但到目前为止 AlarmReceiver 类没有做任何事情。当我尝试运行它时遇到一些错误(但应用程序不会崩溃):

04-14 11:52:54.592 1300-1354/? I/ActivityManager: START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.example.xxx.myapplication3/com.example.xxx.myapplication.MainActivity (has extras)} from uid 10014 on display 0
04-14 11:52:54.673 1300-1635/? I/ActivityManager: START u0 {act=android.content.pm.action.REQUEST_PERMISSIONS pkg=com.android.packageinstaller cmp=com.android.packageinstaller/.permission.ui.GrantPermissionsActivity (has extras)} from uid 10057 on display 0

我不确定错误日志是否与此相关或项目中的其他内容相关。我究竟做错了什么？预先感谢您的回答。

Answer 1

抱歉，我后来在 list 中看到了您的接收器，您的错误是您使用 getService 而不是 getBroadcast 获取待处理的 Intent 。

只需将其更改为:

PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);

我刚刚尝试过:)

--已编辑，我将将此作为引用--

您必须以某种方式注册接收器，无论是通过代码还是通过 xml。

The alarm is an Intent broadcast that goes to a broadcast receiver that you registered with registerReceiver(BroadcastReceiver, IntentFilter) or through the tag in an AndroidManifest.xml file.

引用:

-Pending intent - getBroadcast

-AlarmManager

-Triggering alarm and issues