Why my android-notification doesn't appear?

Question

i create an android notification with a compiled sdk version of 28 with min sdk version of 26, i actually developing android that need a notification so 1st i create an android notification separated from my FirstApplication, it works fine but when i add this notification in my FirstApplication the notification doesn't appear.

App.java

import android.app.Application; import android.app.NotificationChannel; import android.app.NotificationManager; import android.os.Build; public class App extends Application { public static final String CHANNEL_1_ID = "channel1"; public static final String CHANNEL_2_ID = "channel2"; @Override public void onCreate() { super.onCreate(); createNotificationChannels(); } private void createNotificationChannels() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { NotificationChannel channel1 = new NotificationChannel( CHANNEL_1_ID, "Channel 1", NotificationManager.IMPORTANCE_HIGH ); channel1.setDescription("This is Channel 1"); NotificationChannel channel2 = new NotificationChannel( CHANNEL_2_ID, "Channel 2", NotificationManager.IMPORTANCE_LOW ); channel2.setDescription("This is Channel 2"); NotificationManager manager = getSystemService(NotificationManager.class); manager.createNotificationChannel(channel1); manager.createNotificationChannel(channel2); } } }

MainActivity.java

import android.app.Notification; import android.support.v4.app.NotificationCompat; import android.support.v4.app.NotificationManagerCompat; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.EditText; import static com.project.cms.App.CHANNEL_1_ID; import static com.project.cms.App.CHANNEL_2_ID; public class MainActivity extends AppCompatActivity { private NotificationManagerCompat notificationManager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_home); notificationManager = NotificationManagerCompat.from(this); sendchannel() sendchannel2() } public void sendchannel(){ Notification notification = new NotificationCompat.Builder(this, CHANNEL_1_ID) .setSmallIcon(R.drawable.ic_one) .setContentTitle("Appointment Request") .setContentText("ACCEPTED") .setPriority(NotificationCompat.PRIORITY_HIGH) .setCategory(NotificationCompat.CATEGORY_MESSAGE) .build(); notificationManager.notify(1, notification); } public void sendchannel2(){ Notification notification = new NotificationCompat.Builder(this, CHANNEL_2_ID) .setSmallIcon(R.drawable.ic_one) .setContentTitle("Appointment Request") .setContentText("DECLINED") .setPriority(NotificationCompat.PRIORITY_LOW) .build(); notificationManager.notify(2, notification); } }

when i open the app, the notification should appear but it doesn't work. So im asking you guys to help me and check my code if im missing something or what.

i think you are not added your app class in manifest

Vipul Chauhan
– Vipul Chauhan

2019-03-30 11:01:05 +00:00
Commented Mar 30, 2019 at 11:01 — Vipul Chauhan
– Vipul Chauhan, Commented Mar 30, 2019 at 11:01

Vipul Chauhan · Accepted Answer · 2019-06-15 12:00:24Z

look at this what i am trying to say:-

In your application tag add name="App" which is your class name of creating channels and also extends the Application class

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

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.SET_WALLPAPER"/> <permission android:name="android.permission.MEDIA_CONTENT_CONTROL" /> <application android:name=".notification" android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" 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> <activity android:name=".Main2Activity" /> <activity android:name=".Main3Activity"/> <service android:name=".MyService" android:enabled="true"/> <service android:name=".Service" android:enabled="true"/> <provider android:authorities="${applicationId}.provider" android:name="android.support.v4.content.FileProvider" android:exported="false" android:grantUriPermissions="true"> <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/provider_paths"/> </provider> </application>

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