奥利奥里没有显示通知

普通的 NotificationBuilder 不会在 AndroidO 上显示通知。

我怎样才能在安卓8奥利奥上显示通知？

有没有什么新的代码可以用来在 Android O 上显示通知？

164708 次浏览
小开
最佳答案

在 Android O 中，它是带有通知生成器的 使用频道的必要条件

下面是一个示例代码:

// Sets an ID for the notification, so it can be updated.
int notifyID = 1;
String CHANNEL_ID = "my_channel_01";// The id of the channel.
CharSequence name = getString(R.string.channel_name);// The user-visible name of the channel.
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel mChannel = new NotificationChannel(CHANNEL_ID, name, importance);
// Create a notification and set the notification channel.
Notification notification = new Notification.Builder(MainActivity.this)
.setContentTitle("New Message")
.setContentText("You've received new messages.")
.setSmallIcon(R.drawable.ic_notify_status)
.setChannelId(CHANNEL_ID)
.build();

或与处理兼容性:

NotificationCompat notification =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.notification_icon)
.setContentTitle("My notification")
.setContentText("Hello World!")
.setChannelId(CHANNEL_ID).build();

现在通知他们

NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.createNotificationChannel(mChannel);


// Issue the notification.
mNotificationManager.notify(notifyID , notification);

或者，如果你想要一个简单的解决方案，那么使用以下代码:

NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
mNotificationManager.createNotificationChannel(mChannel);
}

NotificationCompat. Builder 引用

NotificationCompat.Builder(Context context)

此构造函数在 API 级别26.0.0中不推荐使用 所以你应该用

Builder(Context context, String channelId)

所以不需要使用 setChannelId和新的构造函数。

您应该使用当前最新的 AppCompat 库26.0.2

compile "com.android.support:appcompat-v7:26.0.+"

来自 Youtube 上的 Android 开发者频道

另外，你可以检查 官方 Android 文档

小开

除了 这个答案之外，您还需要在使用通知通道之前创建通知通道。

  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {


/* Create or update. */
NotificationChannel channel = new NotificationChannel("my_channel_01",
"Channel human readable title",
NotificationManager.IMPORTANCE_DEFAULT);
mNotificationManager.createNotificationChannel(channel);
}

此外，只有在 targetSdkVersion 为26或更高版本时，才需要使用通道。

如果您正在使用 NotificationCompat。Builder，您还需要更新到支持库的 beta 版本: https://developer.android.com/topic/libraries/support-library/revisions.html#26-0-0-beta2(以便能够在 compat Builder 上调用 setChannelId)。

当这个库更新将 minSdkLevel 提升到14时，要小心。

小开 
    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, "CHANNEL_ID")
........


NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);


if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
CharSequence name = "Hello";// The user-visible name of the channel.
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel mChannel = new NotificationChannel(CHANNEL_ID, name, importance);
mNotificationManager.createNotificationChannel(mChannel);
}
mNotificationManager.notify(notificationId, notificationBuilder.build());
小开

在这里我张贴了一些快速解决方案的意图处理功能

public void showNotification(Context context, String title, String body, Intent intent) {
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);


int notificationId = 1;
String channelId = "channel-01";
String channelName = "Channel Name";
int importance = NotificationManager.IMPORTANCE_HIGH;


if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
NotificationChannel mChannel = new NotificationChannel(
channelId, channelName, importance);
notificationManager.createNotificationChannel(mChannel);
}


NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context, channelId)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(title)
.setContentText(body);


TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
stackBuilder.addNextIntent(intent);
PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(
0,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);


notificationManager.notify(notificationId, mBuilder.build());
}
小开 
public class MyFirebaseMessagingServices extends FirebaseMessagingService {
private NotificationChannel mChannel;
private NotificationManager notifManager;
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
if (remoteMessage.getData().size() > 0) {
try {
JSONObject jsonObject = new JSONObject(remoteMessage.getData());
displayCustomNotificationForOrders(jsonObject.getString("title"), jsonObject.getString("description"));
} catch (JSONException e) {
e.printStackTrace();
}
}
}


private void displayCustomNotificationForOrders(String title, String description) {
if (notifManager == null) {
notifManager = (NotificationManager) getSystemService
(Context.NOTIFICATION_SERVICE);
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationCompat.Builder builder;
Intent intent = new Intent(this, Dashboard.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent;
int importance = NotificationManager.IMPORTANCE_HIGH;
if (mChannel == null) {
mChannel = new NotificationChannel
("0", title, importance);
mChannel.setDescription(description);
mChannel.enableVibration(true);
notifManager.createNotificationChannel(mChannel);
}
builder = new NotificationCompat.Builder(this, "0");


intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |
Intent.FLAG_ACTIVITY_SINGLE_TOP);
pendingIntent = PendingIntent.getActivity(this, 1251, intent, PendingIntent.FLAG_ONE_SHOT);
builder.setContentTitle(title)
.setSmallIcon(getNotificationIcon()) // required
.setContentText(description)  // required
.setDefaults(Notification.DEFAULT_ALL)
.setAutoCancel(true)
.setLargeIcon(BitmapFactory.decodeResource
(getResources(), R.mipmap.logo))
.setBadgeIconType(R.mipmap.logo)
.setContentIntent(pendingIntent)
.setSound(RingtoneManager.getDefaultUri
(RingtoneManager.TYPE_NOTIFICATION));
Notification notification = builder.build();
notifManager.notify(0, notification);
} else {


Intent intent = new Intent(this, Dashboard.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = null;


pendingIntent = PendingIntent.getActivity(this, 1251, intent, PendingIntent.FLAG_ONE_SHOT);


Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setContentTitle(title)
.setContentText(description)
.setAutoCancel(true)
.setColor(ContextCompat.getColor(getBaseContext(), R.color.colorPrimary))
.setSound(defaultSoundUri)
.setSmallIcon(getNotificationIcon())
.setContentIntent(pendingIntent)
.setStyle(new NotificationCompat.BigTextStyle().setBigContentTitle(title).bigText(description));


NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(1251, notificationBuilder.build());
}
}


private int getNotificationIcon() {
boolean useWhiteIcon = (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP);
return useWhiteIcon ? R.mipmap.logo : R.mipmap.logo;
}
}
小开

这是11.8.0版本中的 bug，所以如果你减少 API 版本，你将不会面临这个问题。

小开

对于在尝试上述解决方案之后仍在纠结于此的任何人，请确保在创建通知通道时使用的通道 ID 是您在 Notification 构建器中设置的通道 ID 的 一模一样。

const val CHANNEL_ID = "EXAMPLE_CHANNEL_ID"


// create notification channel
val notificationChannel = NotificationChannel(CHANNEL_ID,
NOTIFICATION_NAME, NotificationManager.IMPORTANCE_HIGH)


// building notification
NotificationCompat.Builder(context)
.setSmallIcon(android.R.drawable.ic_input_add)
.setContentTitle("Title")
.setContentText("Subtitle")
.setPriority(NotificationCompat.PRIORITY_MAX)
.setChannelId(CHANNEL_ID)
小开

你要这么做

private fun sendNotification() {
val notificationId = 100
val chanelid = "chanelid"
val intent = Intent(this, MainActivity::class.java)
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)
val pendingIntent = PendingIntent.getActivity(this, 0, intent, 0)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { // you must create a notification channel for API 26 and Above
val name = "my channel"
val description = "channel description"
val importance = NotificationManager.IMPORTANCE_DEFAULT
val channel = NotificationChannel(chanelid, name, importance);
channel.setDescription(description);
// Register the channel with the system; you can't change the importance
// or other notification behaviors after this
val notificationManager = getSystemService(NotificationManager::class.java)
notificationManager.createNotificationChannel(channel)
}


val mBuilder = NotificationCompat.Builder(this, chanelid)
.setSmallIcon(R.drawable.ic_notification)
.setContentTitle("Want to Open My App?")
.setContentText("Open my app and see good things")
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.setContentIntent(pendingIntent)
.setAutoCancel(true) // cancel the notification when clicked
.addAction(R.drawable.ic_check, "YES", pendingIntent) //add a btn to the Notification with a corresponding intent


val notificationManager = NotificationManagerCompat.from(this);
notificationManager.notify(notificationId, mBuilder.build());
}

阅读完整的教程 at = > https://developer.android.com/training/notify-user/build-notification

小开

Android 通知演示应用程序的 Android O 以及较低的 API 版本。 这里是 GitHub-Demo 1和 GitHub-Demo 2上最好的演示应用程序。

enter image description here

小开 
private void addNotification() {
NotificationCompat.Builder builder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher_background)
.setContentTitle("Notifications Example")
.setContentText("This is a test notification");
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
builder.setContentIntent(contentIntent);
// Add as notification
NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O)
{
NotificationChannel nChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "NOTIFICATION_CHANNEL_NAME", NotificationManager.IMPORTANCE_HIGH);
nChannel.enableLights(true);
assert manager != null;
builder.setChannelId(NOTIFICATION_CHANNEL_ID);
manager.createNotificationChannel(nChannel);
}
assert manager != null;
manager.notify(0, builder.build());
}
小开

在安卓系统 Oreo 中，通知应用程序是通过使用通道和 NotificationHelper 类完成的。它应该有一个通道 ID 和通道名称。

首先，您必须创建 NotificationHelper 类

public class NotificationHelper extends ContextWrapper {


private static final String EDMT_CHANNEL_ID="com.example.safna.notifier1.EDMTDEV";
private static final String EDMT_CHANNEL_NAME="EDMTDEV Channel";
private NotificationManager manager;


public  NotificationHelper(Context base)
{
super(base);
createChannels();
}
private void createChannels()
{
NotificationChannel edmtChannel=new NotificationChannel(EDMT_CHANNEL_ID,EDMT_CHANNEL_NAME,NotificationManager.IMPORTANCE_DEFAULT);
edmtChannel.enableLights(true);
edmtChannel.enableVibration(true);
edmtChannel.setLightColor(Color.GREEN);
edmtChannel.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);


getManager().createNotificationChannel(edmtChannel);


}
public NotificationManager getManager()
{
if (manager==null)
manager=(NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
return manager;


}
public NotificationCompat.Builder getEDMTChannelNotification(String title,String body)
{
return new NotificationCompat.Builder(getApplicationContext(),EDMT_CHANNEL_ID)
.setContentText(body)
.setContentTitle(title)
.setSmallIcon(R.mipmap.ic_launcher_round)
.setAutoCancel(true);
}
}

在活动 xml 文件中创建一个按钮，然后在主活动中创建一个按钮

protected void onCreate(Bundle savedInstanceState) {


super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);


helper=new NotificationHelper(this);


btnSend=(Button)findViewById(R.id.btnSend);


btnSend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String title="Title";
String content="Content";
Notification.Builder builder=helper.getEDMTChannelNotification(title,content);
helper.getManager().notify(new Random().nextInt(),builder.build());
}
});


}

那就运行你的项目

小开

如果你不能得到26 + SDK 版本的推送通知？

你的解决办法在这里:

public static void showNotification(Context context, String title, String messageBody) {


boolean isLoggedIn = SessionManager.getInstance().isLoggedIn();
Log.e(TAG, "User logged in state: " + isLoggedIn);


Intent intent = null;
if (isLoggedIn) {
//goto notification screen
intent = new Intent(context, MainActivity.class);
intent.putExtra(Extras.EXTRA_JUMP_TO, DrawerItems.ITEM_NOTIFICATION);
} else {
//goto login screen
intent = new Intent(context, LandingActivity.class);
}


intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0 /* Request code */, intent, PendingIntent.FLAG_ONE_SHOT);


//Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
//Bitmap largeIcon = BitmapFactory.decodeResource(getResources(), R.drawable.ic_app_notification_icon);


String channel_id = createNotificationChannel(context);


NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, channel_id)
.setContentTitle(title)
.setContentText(messageBody)
.setStyle(new NotificationCompat.BigTextStyle().bigText(messageBody))
/*.setLargeIcon(largeIcon)*/
.setSmallIcon(R.drawable.app_logo_color) //needs white icon with transparent BG (For all platforms)
.setColor(ContextCompat.getColor(context, R.color.colorPrimaryDark))
.setVibrate(new long[]{1000, 1000})
.setSound(Settings.System.DEFAULT_NOTIFICATION_URI)
.setContentIntent(pendingIntent)
.setPriority(Notification.PRIORITY_HIGH)
.setAutoCancel(true);


NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify((int) ((new Date(System.currentTimeMillis()).getTime() / 1000L) % Integer.MAX_VALUE) /* ID of notification */, notificationBuilder.build());
}


public static String createNotificationChannel(Context context) {


// NotificationChannels are required for Notifications on O (API 26) and above.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {


// The id of the channel.
String channelId = "Channel_id";


// The user-visible name of the channel.
CharSequence channelName = "Application_name";
// The user-visible description of the channel.
String channelDescription = "Application_name Alert";
int channelImportance = NotificationManager.IMPORTANCE_DEFAULT;
boolean channelEnableVibrate = true;
//            int channelLockscreenVisibility = Notification.;


// Initializes NotificationChannel.
NotificationChannel notificationChannel = new NotificationChannel(channelId, channelName, channelImportance);
notificationChannel.setDescription(channelDescription);
notificationChannel.enableVibration(channelEnableVibrate);
//            notificationChannel.setLockscreenVisibility(channelLockscreenVisibility);


// Adds NotificationChannel to system. Attempting to create an existing notification
// channel with its original values performs no operation, so it's safe to perform the
// below sequence.
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
assert notificationManager != null;
notificationManager.createNotificationChannel(notificationChannel);


return channelId;
} else {
// Returns null for pre-O (26) devices.
return null;
}
}

NotificationCompat.Builder notificationBuilder = new NotificationCompat. Builder (context，channel _ id)

在这里你会得到推送通知使用 channel_id在您的设备是包含26 + SDK 版本。

- > ，因为 NotificationCompat.Builder(context)是不推荐的方法，现在您将使用一个更新的版本，它有两个参数，一个是 context，另一个是 channel _ id。

- > NotificationCompat.Builder(context, channel_id)更新方法，试试看。

在26 + SDK 版本的设备中，每次都会创建 channel _ id。

小开

下面的方法将 显示通知，有大文本和冻结启用(通知将不会被删除，即使在用户刷新)。我们需要 NotificationManager 服务

public static void showNotificationOngoing(Context context,String title) {
NotificationManager notificationManager =
(NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);


PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
new Intent(context, MainActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);


Notification.Builder notificationBuilder = new Notification.Builder(context)
.setContentTitle(title + DateFormat.getDateTimeInstance().format(new Date()) + ":" + accuracy)
.setContentText(addressFragments.toString())
.setSmallIcon(R.mipmap.ic_launcher)
.setContentIntent(contentIntent)
.setOngoing(true)
.setStyle(new Notification.BigTextStyle().bigText(addressFragments.toString()))
.setAutoCancel(true);
notificationManager.notify(3, notificationBuilder.build());
}

方法到 删除通知

public static void removeNotification(Context context){
NotificationManager notificationManager =
(NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
notificationManager.cancelAll();
}

来源 林克

小开

试试这个代码: 

public class FirebaseMessagingServices extends com.google.firebase.messaging.FirebaseMessagingService {
private static final String TAG = "MY Channel";
Bitmap bitmap;


@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
Utility.printMessage(remoteMessage.getNotification().getBody());


// Check if message contains a data payload.
if (remoteMessage.getData().size() > 0) {
Log.d(TAG, "Message data payload: " + remoteMessage.getData());


String title = remoteMessage.getData().get("title");
String body = remoteMessage.getData().get("body");
String message = remoteMessage.getData().get("message");
String imageUri = remoteMessage.getData().get("image");
String msg_id = remoteMessage.getData().get("msg-id");
          



Log.d(TAG, "1: " + title);
Log.d(TAG, "2: " + body);
Log.d(TAG, "3: " + message);
Log.d(TAG, "4: " + imageUri);
          



if (imageUri != null)
bitmap = getBitmapfromUrl(imageUri);


}


sendNotification(message, bitmap, title, msg_id);
                    

}




}


private void sendNotification(String message, Bitmap image, String title,String msg_id) {
int notifyID = 0;
try {
notifyID = Integer.parseInt(msg_id);
} catch (NumberFormatException e) {
e.printStackTrace();
}


String CHANNEL_ID = "my_channel_01";            // The id of the channel.
Intent intent = new Intent(this, HomeActivity.class);
intent.putExtra("title", title);
intent.putExtra("message", message);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);




PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
PendingIntent.FLAG_ONE_SHOT);


Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, "01")
.setContentTitle(title)
.setSmallIcon(R.mipmap.ic_notification)
.setStyle(new NotificationCompat.BigTextStyle()
.bigText(message))
.setContentText(message)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setChannelId(CHANNEL_ID)
.setContentIntent(pendingIntent);


if (image != null) {
notificationBuilder.setStyle(new NotificationCompat.BigPictureStyle()   //Set the Image in Big picture Style with text.
.bigPicture(image)
.setSummaryText(message)
.bigLargeIcon(null));
}




NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);


if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {       // For Oreo and greater than it, we required Notification Channel.
CharSequence name = "My New Channel";                   // The user-visible name of the channel.
int importance = NotificationManager.IMPORTANCE_HIGH;


NotificationChannel channel = new NotificationChannel(CHANNEL_ID,name, importance); //Create Notification Channel
notificationManager.createNotificationChannel(channel);
}


notificationManager.notify(notifyID /* ID of notification */, notificationBuilder.build());
}


public Bitmap getBitmapfromUrl(String imageUrl) {     //This method returns the Bitmap from Url;
try {
URL url = new URL(imageUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(input);
return bitmap;


} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;


}


}


}

小开 
NotificationCompat.Builder(Context context)

对于大于或等于机器人奥利奥的版本，已经不推荐使用。您可以将实现更改为使用

NotificationCompat.Builder(Context context, String channelId)
小开

将此类用于 Android8通知

public class NotificationHelper {


private Context mContext;
private NotificationManager mNotificationManager;
private NotificationCompat.Builder mBuilder;
public static final String NOTIFICATION_CHANNEL_ID = "10001";


public NotificationHelper(Context context) {
mContext = context;
}


/**
* Create and push the notification
*/
public void createNotification(String title, String message)
{
/**Creates an explicit intent for an Activity in your app**/
Intent resultIntent = new Intent(mContext , SomeOtherActivity.class);
resultIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);


PendingIntent resultPendingIntent = PendingIntent.getActivity(mContext,
0 /* Request code */, resultIntent,
PendingIntent.FLAG_UPDATE_CURRENT);


mBuilder = new NotificationCompat.Builder(mContext);
mBuilder.setSmallIcon(R.mipmap.ic_launcher);
mBuilder.setContentTitle(title)
.setContentText(message)
.setAutoCancel(false)
.setSound(Settings.System.DEFAULT_NOTIFICATION_URI)
.setContentIntent(resultPendingIntent);


mNotificationManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);


if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O)
{
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "NOTIFICATION_CHANNEL_NAME", importance);
notificationChannel.enableLights(true);
notificationChannel.setLightColor(Color.RED);
notificationChannel.enableVibration(true);
notificationChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
assert mNotificationManager != null;
mBuilder.setChannelId(NOTIFICATION_CHANNEL_ID);
mNotificationManager.createNotificationChannel(notificationChannel);
}
assert mNotificationManager != null;
mNotificationManager.notify(0 /* Request Code */, mBuilder.build());
}
}
小开 
fun pushNotification(message: String?, clickAtion: String?) {
val ii = Intent(clickAtion)
ii.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
val pendingIntent = PendingIntent.getActivity(this, REQUEST_CODE, ii, PendingIntent.FLAG_ONE_SHOT)


val soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)


val largIcon = BitmapFactory.decodeResource(applicationContext.resources,
R.mipmap.ic_launcher)




val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager


val channelId = "default_channel_id"
val channelDescription = "Default Channel"
// Since android Oreo notification channel is needed.
//Check if notification channel exists and if not create one
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
var notificationChannel = notificationManager.getNotificationChannel(channelId)
if (notificationChannel != null) {
val importance = NotificationManager.IMPORTANCE_HIGH //Set the importance level
notificationChannel = NotificationChannel(channelId, channelDescription, importance)
// notificationChannel.lightColor = Color.GREEN //Set if it is necesssary
notificationChannel.enableVibration(true) //Set if it is necesssary
notificationManager.createNotificationChannel(notificationChannel)




val noti_builder = NotificationCompat.Builder(this)
.setContentTitle("MMH")
.setContentText(message)
.setSmallIcon(R.drawable.ic_launcher_background)
.setChannelId(channelId)
.build()
val random = Random()
val id = random.nextInt()
notificationManager.notify(id,noti_builder)


}


}
else
{
val notificationBuilder = NotificationCompat.Builder(this)
.setSmallIcon(R.mipmap.ic_launcher).setColor(resources.getColor(R.color.colorPrimary))
.setVibrate(longArrayOf(200, 200, 0, 0, 0))
.setContentTitle(getString(R.string.app_name))


.setLargeIcon(largIcon)
.setContentText(message)
.setAutoCancel(true)
.setStyle(NotificationCompat.BigTextStyle().bigText(message))
.setSound(soundUri)
.setContentIntent(pendingIntent)




val random = Random()
val id = random.nextInt()
notificationManager.notify(id, notificationBuilder.build())


}






}
小开

通知频道和 通知，建造者中的 CHANNEL_ID必须相同，请尝试以下代码:

String CHANNEL_ID = "my_channel_01";
NotificationChannel channel = new NotificationChannel(CHANNEL_ID, "Solveta Unread", NotificationManager.IMPORTANCE_DEFAULT);




Notification.Builder notification = new Notification.Builder(getApplicationContext(), CHANNEL_ID);
小开

下面的代码片段是工作为我在奥利奥，你可以尝试这一点。希望对你有用

Private void sendNotification (上下文 ctx、字符串标题、 int notificationNumber、字符串消息、字符串子文本、意图){
尝试{

            PendingIntent pendingIntent = PendingIntent.getActivity(ctx, notificationNumber, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
Uri url = null;
NotificationCompat.Builder notificationBuilder = null;
try {
if (Build.VERSION.SDK_INT >= 26) {


try{
NotificationManager notificationManager = (NotificationManager)getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.deleteNotificationChannel(CHANNEL_ID_1);
notificationManager.deleteNotificationChannel(CHANNEL_ID_2);


if(!intent.getStringExtra("type").equalsIgnoreCase(""+TYPE_REQUEST)){
NotificationChannel breaking = new NotificationChannel(CHANNEL_ID_1, CHANNEL_ID_1_NAME, NotificationManager.IMPORTANCE_HIGH);
breaking.setShowBadge(false);
breaking.enableLights(true);
breaking.enableVibration(true);
breaking.setLightColor(Color.WHITE);
breaking.setVibrationPattern(new long[]{100, 200, 100, 200, 100, 200, 100});
breaking.setSound(url,new AudioAttributes.Builder().build());


notificationBuilder = new NotificationCompat.Builder(this,CHANNEL_ID_1)
.setSmallIcon(R.mipmap.ic_launcher);
notificationManager.createNotificationChannel(breaking);


}else{


NotificationChannel politics = new NotificationChannel(CHANNEL_ID_2,CHANNEL_ID_2_NAME, NotificationManager.IMPORTANCE_DEFAULT);
politics.setShowBadge(false);
politics.enableLights(true);
politics.enableVibration(true);
politics.setLightColor(Color.BLUE);
politics.setVibrationPattern(new long[]{100, 200, 100, 200, 100});
politics.setSound(url,new AudioAttributes.Builder().build());


notificationBuilder = new NotificationCompat.Builder(this,CHANNEL_ID_2)
.setSmallIcon(R.mipmap.ic_launcher);
notificationManager.createNotificationChannel(politics);
}
}catch (Exception e){
e.printStackTrace();
}


} else {
notificationBuilder = new NotificationCompat.Builder(ctx)
.setSmallIcon(R.mipmap.ic_launcher);
}
} catch (Exception e) {
e.printStackTrace();
}


if (notificationBuilder == null) {
notificationBuilder = new NotificationCompat.Builder(ctx)
.setSmallIcon(R.mipmap.ic_launcher);
}




notificationBuilder.setContentTitle(title);
notificationBuilder.setSubText(subtext);
notificationBuilder.setAutoCancel(true);


notificationBuilder.setContentIntent(pendingIntent);
notificationBuilder.setNumber(notificationNumber);
NotificationManager notificationManager =
(NotificationManager) ctx.getSystemService(Context.NOTIFICATION_SERVICE);


notificationManager.notify(notificationNumber, notificationBuilder.build());


} catch (Exception e) {
e.printStackTrace();
}


}
小开

我在奥利奥上遇到了同样的问题，并且发现如果你首先用 NotificationManager.IMPORTANCE _ NONE 创建你的频道，然后再更新它，频道将保持原来的重要性级别。

这得到了 Google 通知培训文档的支持，它指出:

创建通知通道后，不能更改通知行为ーー此时用户拥有完全的控制权。

删除和重新安装应用程序将允许您重置通道行为。

最好避免使用 IMPORTANCE _ NONE，除非您想要禁止该通道的通知，即使用静默通知。

小开

在我的案例中，我有 Android 8.1.0和型号 Vivo1811，我已经尝试了上述所有的解决方案，但没有工作。

所以最后，我写到 Firebase 支持然后在进一步调试，我得到了这个- “未能向已停止的应用程序广播”: 确保应用程序未被强制停止“ 。

这是来自 Firebase 团队的回复

这是一个由电池优化引起的已知问题 当一个应用程序在应用程序中被滑走时 交换机，应用程序被视为如果它是强制停止，其中 不是 Android 的默认行为 这是它可以导致 FCM 服务为您的应用程序停止 我们正在努力从我们的角度改进这种行为，但是 实际修复必须来自 OEM 方。

这里 OEM 代表 原始设备制造商。

小开

您需要为 API 级别高于26(oreo)的用户创建一个通知通道。

`NotificationChannel channel = new NotificationChannel(STRING_ID,CHANNEL_NAME,NotificationManager.IMPORTANCE_HIGH);

STRING _ ID = STRING 通知通道 id 与 Notification.Builder 中的通知通知通道 id 相同，如下所示

`Notification notification = new Notification.Builder(this,STRING_ID)
.setSmallIcon(android.R.drawable.ic_menu_help)
.setContentTitle("Hello Notification")
.setContentText("It is Working")
.setContentIntent(pendingIntent)
.build();`

通知中的通道 ID 和通知中的通道 ID 应该相同 整个代码是这样的. 。 `

@RequiresApi(api = Build.VERSION_CODES.O)
private void callNotification2() {


Intent intent = new Intent(getApplicationContext(),MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this,11,
intent,PendingIntent.FLAG_UPDATE_CURRENT);
Notification notification = new Notification.Builder(this,"22")
.setSmallIcon(android.R.drawable.ic_menu_help)
.setContentTitle("Hello Notification")
.setContentText("It is Working")
.setContentIntent(pendingIntent)
.build();
NotificationChannel channel = new
NotificationChannel("22","newName",NotificationManager.IMPORTANCE_HIGH);
NotificationManager manager = (NotificationManager)
getSystemService(NOTIFICATION_SERVICE);
manager.createNotificationChannel(channel);
manager.notify(11,notification);


}'
小开

首先，如果你不知道，从 Android Oreo 也就是 API 26级，通知必须通过一个通道注册。

在这种情况下，许多教程可能会使您感到困惑，因为它们显示了不同的例子通知上述奥利奥和下面。

因此，这里有一个共同的代码，运行在上面和下面的奥利奥:

String CHANNEL_ID = "MESSAGE";
String CHANNEL_NAME = "MESSAGE";


NotificationManagerCompat manager = NotificationManagerCompat.from(MainActivity.this);


if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME,
NotificationManager.IMPORTANCE_DEFAULT);
manager.createNotificationChannel(channel);
}


Notification notification = new NotificationCompat.Builder(MainActivity.this,CHANNEL_ID)
.setSmallIcon(R.drawable.ic_android_black_24dp)
.setContentTitle(TitleTB.getText().toString())
.setContentText(MessageTB.getText().toString())
.build();
manager.notify(getRandomNumber(), notification); // In case you pass a number instead of getRandoNumber() then the new notification will override old one and you wont have more then one notification so to do so u need to pass unique number every time so here is how we can do it by "getRandoNumber()"

private static int getRandomNumber() {
Date dd= new Date();
SimpleDateFormat ft =new SimpleDateFormat ("mmssSS");
String s=ft.format(dd);
return Integer.parseInt(s);
}

视频教程: YouTube 视频

如果你想下载这个演示: GitHub Link GitHub 链接

小开

我面对过这个问题，但找到了一个独特的解决方案。
对我来说，这是老规矩

String NOTIFICATION_CHANNEL_ID = "com.codedevtech.emplitrack";

工作代码是

String NOTIFICATION_CHANNEL_ID = "emplitrack_channel";

可能是频道 ID 不应该包含点’


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