广播接收机中未显示通知

Question

即使打开或关闭应用程序，也不会收到通知。但是吐司只有在应用程序打开时才会出现。我有一个主要活动，另一个是扩展广播侦听器的类。在活动中，我正在请求权限，而在课堂上，我编写了用于通知来电的代码。请帮助我提供一些代码片段。下面是我的活动课。

public class PhoneActivity extends AppCompatActivity {
  private static final int REQUEST_READ_PHONE_STATE = 1;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_phone);

    int readContactsPermissionLog = ContextCompat.checkSelfPermission(this,Manifest.permission.READ_CALL_LOG);
    if(readContactsPermissionLog != PackageManager.PERMISSION_GRANTED) {
      ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_CALL_LOG}, REQUEST_READ_PHONE_STATE);
    }
    int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE);
    if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
      ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_PHONE_STATE}, REQUEST_READ_PHONE_STATE);
    }
  }
}

这是我的扩展广播接收器的课程。

public class PhoneState extends BroadcastReceiver {
  public static final String NOTIFICATION_CHANNEL_ID = "10001" ;
  private final static String default_notification_channel_id = "default" ;
  boolean connected  = true;
  @RequiresApi(api = Build.VERSION_CODES.O)
  @Override
  public void onReceive(Context context, Intent intent) {
    if (intent.getAction().equals("android.intent.action.PHONE_STATE")) {
      String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);
      if (state != null) {
        if (state.equals(TelephonyManager.EXTRA_STATE_RINGING)) {
          if (!intent.getExtras().containsKey(TelephonyManager.EXTRA_INCOMING_NUMBER)) {
            Log.i("Call receiver", "skipping intent=" + intent + ", extras=" + intent.getExtras() + " - no number was supplied");
            return;
          }
          String number = intent.getExtras().getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
          System.out.println("incoming number is " + number);
          if (number != null) {
            if (number.equals("some number i have given for testing")) {
              System.out.println("number matched");
              showNotification(context);
              // Toast.makeText(context, "number is " + number, Toast.LENGTH_SHORT).show();
            } else {
              showNotification(context);
            //  Toast.makeText(context, "number is " + number, Toast.LENGTH_LONG).show();
              System.out.println("not matched");
            }
          } else {
            System.out.println("number is null");
          }
        }
      }
    }
  }
  public void showNotification(Context context){
    Intent testIntent = new Intent("com.example.gridlist.Activity.PhoneActivity");
    PendingIntent contentIntent = PendingIntent.getBroadcast(context, 0,testIntent,PendingIntent.FLAG_UPDATE_CURRENT);
    NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context)
        .setSmallIcon(R.drawable.ic_menu_black_24dp)
        .setContentTitle("My notification")
        .setContentText("Hello World!")
        .setWhen(System.currentTimeMillis())
        .setAutoCancel(false)
        .setOngoing(true)
        .setPriority(Notification.PRIORITY_HIGH)
        .setContentIntent(contentIntent)
        .setDefaults(Notification.DEFAULT_SOUND);
    NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    mNotificationManager.notify(1, mBuilder.build());
  }
}

我已经在清单文件中添加了它。

 <receiver android:name=".PhoneState"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.PHONE_STATE" />
            </intent-filter>
        </receiver>

这是我的布局活动。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".Activity.PhoneActivity">
</LinearLayout>

Answer 1

请确保您的Android版本小于8，否则应使用通知频道创建通知https://developer.android.com/training/notify-user/channels