我在我的应用程序中包含了奥利奥支持。现在编译和目标 SDK 版本是 27。我创建了一个通道来获取我的通知。我正在从应用程序类调用创建通道方法。当应用程序处于前台时，通知看起来很好。但是，当我在应用程序处于后台时收到通知时，会创建默认通道，以便在通知托盘中显示 1 个默认通知和 1 个自定义通知。我正在使用广播接收器来获取通知。下面给出的是我的代码。
清单.xml
<receiver
android:name=".receiver.PushMessageReceiver"
android:exported="true"
android:permission="com.google.android.c2dm.permission.SEND">
<intent-filter android:priority="999">
<action android:name="com.google.android.c2dm.intent.RECEIVE" />
<category android:name="com.caps" />
</intent-filter>
</receiver>
<meta-data
android:name="com.google.firebase.messaging.default_notification_channel_id"
android:value="com.caps" />
广播接收器.java
public class PushMessageReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
abortBroadcast();
Logger.d(Logger.TAG, "notification received");
if (intent != null) {
NotificationHandler.handleNotification(context, formNotificationObject(intent));
}
}
private Notification formNotificationObject(Intent intent) {
Notification notification = new Notification();
notification.setMessageId(TextUtils.isEmpty(intent.getStringExtra("messageid")) ?
0 : Integer.parseInt(intent.getStringExtra("messageid")));
notification.setTitle(intent.getStringExtra("title"));
notification.setBody(intent.getStringExtra("body"));
notification.setImage(intent.getStringExtra("image"));
notification.setType(intent.getStringExtra("type"));
notification.setUrl(intent.getStringExtra("url"));
notification.setExpiry(intent.getStringExtra("expiry"));
if (intent.hasExtra("param")) {
String data = intent.getStringExtra("param");
ObjectMapper mapper = new ObjectMapper();
try {
CFLProduct product = mapper.readValue(data, CFLProduct.class);
notification.setParam(product);
} catch (IOException e) {
e.printStackTrace();
}
}
return notification;
}
}
NotificationHandler.java
public class NotificationHandler {
private static final CharSequence ANDROID_CHANNEL_NAME = "Promotions";
private static final String ANDROID_CHANNEL_ID = "com.caps";
private static NotificationManager mNotificationManager;
public static void handleNotification(Context context, Notification notification) {
if (notification != null) {
Logger.d(Logger.TAG, notification.toString());
showNotification(context, notification);
} else {
Logger.e(Logger.TAG, "notification is null");
}
}
private static NotificationCompat.Builder getNotificationBuilder(Context context) {
if (CommonUtils.isOreoOrAbove()) {
return new NotificationCompat.Builder(context, ANDROID_CHANNEL_ID);
} else {
return new NotificationCompat.Builder(context);
}
}
private static void showNotification(final Context context, final Notification notification) {
final NotificationCompat.Builder builder = getNotificationBuilder(context);
builder.setContentTitle(notification.getTitle());
builder.setContentText(notification.getBody());
NotificationCompat.BigTextStyle bigTextStyle = new NotificationCompat.BigTextStyle();
bigTextStyle.setBigContentTitle(notification.getTitle());
bigTextStyle.bigText(notification.getBody());
builder.setStyle(bigTextStyle);
// Playing notification sound
builder.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION));
getNotificationIcon(context, builder);
builder.setLargeIcon(BitmapFactory.decodeResource(context.getResources(),
R.mipmap.ic_launcher));
builder.setAutoCancel(true);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
Intent resultIntent = new Intent(context, HomeActivity.class);
resultIntent.putExtra(AppConstants.BundleKeys.NOTIFICATION, notification);
stackBuilder.addParentStack(HomeActivity.class);
final int id = new Random().nextInt(1000);
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(id, PendingIntent.FLAG_UPDATE_CURRENT);
builder.setContentIntent(resultPendingIntent);
if (CommonUtils.isValidUrl(notification.getImage())) {
/* DownLoadBitMap downLoadBitMap = new DownLoadBitMap(context, builder, id, notification);
downLoadBitMap.execute(notification.getImage());*/
DownLoadBitmap downLoadBitmap = new DownLoadBitmap(context, builder, id, notification);
downLoadBitmap.loadFromGlide();
} else {
showSmallNotification(context, builder, id);
}
}
private static void getNotificationIcon(Context context, NotificationCompat.Builder notificationBuilder) {
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
notificationBuilder.setSmallIcon(R.drawable.ic_notification_small_icon);
notificationBuilder.setColor(ContextCompat.getColor(context, R.color.colorPrimary));
} else {
notificationBuilder.setSmallIcon(R.mipmap.ic_launcher);
}
}
private static void showSmallNotification(Context context, NotificationCompat.Builder builder, int id) {
if (AppData.getInstance().getNotificationCount() == 0) {
AppData.getInstance().setNotificationCount(1);
}
getManager(context).notify(id, builder.build());
}
private static void showBigNotification(Context context, NotificationCompat.Builder builder, Bitmap bitmap, int id, Notification notification) {
if (AppData.getInstance().getNotificationCount() == 0) {
AppData.getInstance().setNotificationCount(1);
}
NotificationCompat.BigPictureStyle bigPictureStyle = new NotificationCompat.BigPictureStyle();
bigPictureStyle.bigPicture(bitmap);
bigPictureStyle.setBigContentTitle(notification.getTitle());
bigPictureStyle.setSummaryText(notification.getBody());
builder.setStyle(bigPictureStyle);
getManager(context).notify(id, builder.build());
}
@RequiresApi(api = Build.VERSION_CODES.O)
public static void createChannels(Context context) {
// create android channel
NotificationChannel androidChannel = new NotificationChannel(ANDROID_CHANNEL_ID,
ANDROID_CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
// Sets whether notifications posted to this channel should display notification lights
androidChannel.enableLights(true);
// Sets whether notification posted to this channel should vibrate.
androidChannel.enableVibration(true);
// Sets the notification light color for notifications posted to this channel
androidChannel.setLightColor(android.app.Notification.DEFAULT_LIGHTS);
// Sets whether notifications posted to this channel appear on the lockscreen or not
androidChannel.setLockscreenVisibility(android.app.Notification.VISIBILITY_PRIVATE);
getManager(context).createNotificationChannel(androidChannel);
}
private static NotificationManager getManager(Context context) {
if (mNotificationManager == null) {
mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
}
return mNotificationManager;
}
/**
* Downloading push notification image before displaying it in
* the notification tray
*/
private static class DownLoadBitmap {
private Context mContext;
private NotificationCompat.Builder mBuilder;
private int mId;
private Notification mNotification;
private SimpleTarget target = new SimpleTarget<Bitmap>(1024, 512) {
@Override
public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
Logger.d(Logger.TAG, "I got the bitmap");
showBigNotification(mContext, mBuilder, resource, mId, mNotification);
}
@Override
public void onLoadFailed(Exception e, Drawable errorDrawable) {
super.onLoadFailed(e, errorDrawable);
Logger.d(Logger.TAG, "FAILED TO DOWNLOAD RESOURCE"+e.getMessage());
}
};
private DownLoadBitmap(final Context context, final NotificationCompat.Builder builder, final int id, final Notification notification) {
mContext = context;
mBuilder = builder;
mId = id;
mNotification = notification;
}
public void loadFromGlide() {
Glide.with(mContext)
.load(mNotification.getImage())
.asBitmap()
.into(target);
}
}
}
当我已经创建频道并将其设置为默认频道时，我不明白为什么它会创建默认频道。只有当应用程序在后台时才会发生这种情况。可能是什么问题？我该如何解决？