BroadcastReceiver 不起作用，没有通知

Question

我尝试做一个简单的应用程序（或者，更具体地说，是一个 Receiver）：
当用户按下 "Camera button" 或 "Dealer button" - 应用会发出通知。

没有错误，但应用程序无法运行。

我尝试添加权限，但还是不行。

MyDownloadBroadcastReceiver.java:

package elyahsiv.raisenotificationwhendownloadfile;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.NotificationCompat;
import android.util.Log;
public class MyDownloadBroadcastReceiver extends BroadcastReceiver{
    @Override
    public void onReceive (Context context, Intent intent) {
        Log.d("NOTES:", intent.getAction());
        if (intent.getAction() == "android.intent.action.PACKAGE_ADDED")
            showNotification(context);
        else if (intent.getAction() == "android.intent.action.CAMERA_BUTTON")
            showNotification(context);
    }
    private void showNotification(Context context) {
        PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
                new Intent(context, MainActivity.class), 0);
        NotificationCompat.Builder mBuilder =
                (NotificationCompat.Builder) new NotificationCompat.Builder(context)
                        .setSmallIcon(android.R.drawable.stat_notify_error)
                        .setContentTitle("My notification")
                        .setContentText("Hello World!");
        mBuilder.setContentIntent(contentIntent);
        mBuilder.setDefaults(Notification.DEFAULT_SOUND);
        mBuilder.setAutoCancel(true);
        NotificationManager mNotificationManager =
                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        mNotificationManager.notify(1, mBuilder.build());
    }
}

AndroidManifest.xml:

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

    <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">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".MyDownloadBroadcastReceiver" android:enabled="true" android:exported="false">
            <uses-permission android:name="android.permission.CAMERA" />
            <uses-feature android:name="android.hardware.telephony" android:required="false" />
            <intent-filter>
                <action android:name="android.intent.action.PACKAGE_ADDED"></action>
                <action android:name="android.intent.action.CAMERA_BUTTON"></action>
                <action android:name="android.intent.action.CALL_BUTTON"></action>
            </intent-filter>
        </receiver>
    </application>
</manifest>

Answer 1

必须在应用程序标记之前声明权限。您必须拥有 android.permission.CAMERA 甚至更多。在 Intent 过滤器中你必须有

<data android:scheme="package" />

考虑将接收器分成三个不同的接收器。还有

Due to a broadcast behavior change since Android 3.1, your app must be started before it can receive the app installation/removal intents. See kabuko's answer in this thread.

检查此 answer。

尝试在 activity 或创建服务时注册您的接收器。您还应该考虑以下几点：

Apps that target Android 8.0 or higher can no longer register broadcast receivers for implicit broadcasts in their manifest.

例如：

MyDownloadBroadcastReceiver receiver = new MyDownloadBroadcastReceiver(); 
IntentFilter receiverFilterCameraButton = new IntentFilter("android.intent.action.CAMERA_BUTTON");
registerReceiver( receiver, receiverFilterCameraButton );

BroadcastReceiver 不起作用，没有通知

BroadcastReceiver does not work, no notification

android

broadcastreceiver