Android Oreo tweaks (#217)

* display notifications on Android 8.0 Oreo and higher using required notification channels
* fix daemon background service implementation for Android Oreo

Vagrantfile

@@ -65,7 +65,7 @@ Vagrant.configure("2") do |config|
 	mkdir -p cd $HOME/.buildozer/android/platform/
 	wget -q 'https://dl.google.com/android/repository/android-ndk-r13b-linux-x86_64.zip' -P $HOME/.buildozer/android/platform/
 	wget -q 'https://dl.google.com/android/android-sdk_r23-linux.tgz' -P $HOME/.buildozer/android/platform/
-	wget -q 'https://dl.google.com/android/repository/android-23_r02.zip' -P $HOME/.buildozer/android/platform/
+	wget -q 'https://dl.google.com/android/repository/platform-26_r02.zip' -P $HOME/.buildozer/android/platform/
 	wget -q 'https://dl.google.com/android/repository/build-tools_r26.0.1-linux.zip' -P $HOME/.buildozer/android/platform/
 	unzip -qq $HOME/.buildozer/android/platform/android-ndk-r13b-linux-x86_64.zip -d $HOME/.buildozer/android/platform/
 	rm $HOME/.buildozer/android/platform/android-ndk-r13b-linux-x86_64.zip
@@ -73,8 +73,8 @@ Vagrant.configure("2") do |config|
 	rm $HOME/.buildozer/android/platform/android-sdk_r23-linux.tgz
 	mv $HOME/.buildozer/android/platform/android-sdk-linux $HOME/.buildozer/android/platform/android-sdk-23
 	unzip -qq $HOME/.buildozer/android/platform/android-23_r02.zip -d $HOME/.buildozer/android/platform/android-sdk-23/platforms
-	rm $HOME/.buildozer/android/platform/android-23_r02.zip
+	rm $HOME/.buildozer/android/platform/platform-26_r02.zip
-	mv $HOME/.buildozer/android/platform/android-sdk-23/platforms/android-6.0 $HOME/.buildozer/android/platform/android-sdk-23/platforms/android-23
+	mv $HOME/.buildozer/android/platform/android-sdk-23/platforms/android-8.0.0 $HOME/.buildozer/android/platform/android-sdk-23/platforms/android-26
 	mkdir -p $HOME/.buildozer/android/platform/android-sdk-23/build-tools
 	unzip -qq $HOME/.buildozer/android/platform/build-tools_r26.0.1-linux.zip -d $HOME/.buildozer/android/platform/android-sdk-23/build-tools
 	rm $HOME/.buildozer/android/platform/build-tools_r26.0.1-linux.zip

app/src/page/settings/view.js

@@ -1,6 +1,6 @@
 import React from 'react';
 import { SETTINGS } from 'lbry-redux';
-import { Text, View, ScrollView, Switch } from 'react-native';
+import { Text, View, ScrollView, Switch, NativeModules } from 'react-native';
 import PageHeader from '../../component/pageHeader';
 import settingsStyle from '../../styles/settings';
 
@@ -17,9 +17,6 @@ class SettingsPage extends React.PureComponent {
       setClientSetting
     } = this.props;
 
-    // If no true / false value set, default to true
-    const actualKeepDaemonRunning = (keepDaemonRunning === undefined || keepDaemonRunning === null) ? true : keepDaemonRunning;
-    
     return (
       <View>
         <PageHeader title={"Settings"}
@@ -50,7 +47,12 @@ class SettingsPage extends React.PureComponent {
               <Text style={settingsStyle.description}>Enable this option for quicker app launch and to keep the synchronisation with the blockchain up to date.</Text>
             </View>
             <View style={settingsStyle.switchContainer}>
-              <Switch value={actualKeepDaemonRunning} onValueChange={(value) => setClientSetting(SETTINGS.KEEP_DAEMON_RUNNING, value)} />
+              <Switch value={keepDaemonRunning} onValueChange={(value) => {
+                setClientSetting(SETTINGS.KEEP_DAEMON_RUNNING, value);
+                if (NativeModules.DaemonServiceControl) {
+                  NativeModules.DaemonServiceControl.setKeepDaemonRunning(value);
+                }
+              }} />
             </View>
           </View>
         </ScrollView>

app/src/redux/reducers/settings.js

@@ -1,8 +1,22 @@
-import { ACTIONS } from 'lbry-redux';
+import { AsyncStorage } from 'react-native';
+import { ACTIONS, SETTINGS } from 'lbry-redux';
+
+getAsyncStorageItem = key => {
+  return AsyncStorage.getItem(key).then(value => {
+    if (['true', 'false'].indexOf(value) > -1) {
+      return value === 'true';
+    }
+    return value;
+  });
+};
 
 const reducers = {};
 const defaultState = {
-  clientSettings: {}
+  clientSettings: {
+    backgroundPlayEnabled: getAsyncStorageItem(SETTINGS.BACKGROUND_PLAY_ENABLED),
+    keepDaemonRunning: getAsyncStorageItem(SETTINGS.KEEP_DAEMON_RUNNING),
+    showNsfw: getAsyncStorageItem(SETTINGS.SHOW_NSFW)
+  }
 };
 
 reducers[ACTIONS.CLIENT_SETTING_CHANGED] = (state, action) => {
@@ -10,6 +24,7 @@ reducers[ACTIONS.CLIENT_SETTING_CHANGED] = (state, action) => {
   const clientSettings = Object.assign({}, state.clientSettings);
 
   clientSettings[key] = value;
+  AsyncStorage.setItem(key, String(value));
 
   return Object.assign({}, state, {
     clientSettings,

buildozer.spec.sample

@@ -36,7 +36,7 @@ version.filename = %(source.dir)s/main.py
 
 # (list) Application requirements
 # comma seperated e.g. requirements = sqlite3,kivy
-requirements = openssl, sqlite3, hostpython2, android, distro, pyjnius, certifi==2018.4.16, constantly, incremental, functools32, miniupnpc==1.9, gmpy==1.17, twisted==16.6.0, appdirs==1.4.3, argparse==1.2.1, docopt==0.6.2, base58==0.2.2, colorama==0.3.7, dnspython==1.12.0, ecdsa==0.13, envparse==0.2.0, jsonrpc==1.2, jsonrpclib==0.1.7, jsonschema==2.5.1, pbkdf2==1.3, pyyaml==3.12, qrcode==5.2.2, requests==2.9.1, seccure==0.3.1.3, attrs==18.1.0, pyasn1, pyasn1-modules, service_identity==16.0.0, six==1.9.0, slowaes==0.1a1, txJSON-RPC==0.5, wsgiref==0.1.2, zope.interface==4.3.3, protobuf==3.2.0, keyring==10.4.0, git+https://github.com/lbryio/lbryschema.git@v0.0.15#egg=lbryschema, git+https://github.com/lbryio/lbryum.git#egg=lbryum, git+https://github.com/lbryio/lbry.git#egg=lbrynet, asn1crypto, cryptography==2.2.2, pyopenssl==17.4.0, treq==17.8.0, funcsigs, mock, pbr, unqlite
+requirements = openssl, sqlite3, hostpython2, android, distro, pyjnius, certifi==2018.4.16, constantly, incremental, functools32, miniupnpc==1.9, gmpy==1.17, twisted==16.6.0, appdirs==1.4.3, argparse==1.2.1, docopt==0.6.2, base58==0.2.2, colorama==0.3.7, dnspython==1.12.0, ecdsa==0.13, envparse==0.2.0, jsonrpc==1.2, jsonrpclib==0.1.7, jsonschema==2.5.1, pbkdf2==1.3, pyyaml==3.12, qrcode==5.2.2, requests==2.9.1, seccure==0.3.1.3, attrs==18.1.0, pyasn1, pyasn1-modules, service_identity==16.0.0, six==1.9.0, slowaes==0.1a1, txJSON-RPC==0.5, wsgiref==0.1.2, zope.interface==4.3.3, protobuf==3.2.0, keyring==10.4.0, git+https://github.com/lbryio/lbryschema.git@v0.0.16#egg=lbryschema, git+https://github.com/lbryio/lbryum.git#egg=lbryum, git+https://github.com/lbryio/lbry.git@v0.20.4#egg=lbrynet, asn1crypto, cryptography==2.2.2, pyopenssl==17.4.0, treq==17.8.0, funcsigs, mock, pbr, unqlite
 
 # (str) Custom source folders for requirements
 # Sets custom source for any requirements with recipes
@@ -148,7 +148,7 @@ android.react_src = ./app
 
 # (list) Gradle dependencies to add (currently works only with sdl2_gradle
 # bootstrap)
-android.gradle_dependencies = com.android.support:appcompat-v7:23.4.0, com.facebook.react:react-native:0.55.3, com.mixpanel.android:mixpanel-android:5+, com.google.android.gms:play-services-gcm:11.0.4+
+android.gradle_dependencies = com.android.support:appcompat-v7:26.0.1, com.facebook.react:react-native:0.55.3, com.mixpanel.android:mixpanel-android:5+, com.google.android.gms:play-services-gcm:11.0.4+
 
 # (str) python-for-android branch to use, defaults to master
 #p4a.branch = stable

buildozer.spec.travis

@@ -36,7 +36,7 @@ version.filename = %(source.dir)s/main.py
 
 # (list) Application requirements
 # comma seperated e.g. requirements = sqlite3,kivy
-requirements = openssl, sqlite3, hostpython2, android, distro, pyjnius, certifi==2018.4.16, constantly, incremental, functools32, miniupnpc==1.9, gmpy==1.17, twisted==16.6.0, appdirs==1.4.3, argparse==1.2.1, docopt==0.6.2, base58==0.2.2, colorama==0.3.7, dnspython==1.12.0, ecdsa==0.13, envparse==0.2.0, jsonrpc==1.2, jsonrpclib==0.1.7, jsonschema==2.5.1, pbkdf2==1.3, pyyaml==3.12, qrcode==5.2.2, requests==2.9.1, seccure==0.3.1.3, attrs==18.1.0, pyasn1, pyasn1-modules, service_identity==16.0.0, six==1.9.0, slowaes==0.1a1, txJSON-RPC==0.5, wsgiref==0.1.2, zope.interface==4.3.3, protobuf==3.2.0, keyring==10.4.0, git+https://github.com/lbryio/lbryschema.git@v0.0.15#egg=lbryschema, git+https://github.com/lbryio/lbryum.git#egg=lbryum, git+https://github.com/lbryio/lbry.git#egg=lbrynet, asn1crypto, cryptography==2.2.2, pyopenssl==17.4.0, treq==17.8.0, funcsigs, mock, pbr, unqlite
+requirements = openssl, sqlite3, hostpython2, android, distro, pyjnius, certifi==2018.4.16, constantly, incremental, functools32, miniupnpc==1.9, gmpy==1.17, twisted==16.6.0, appdirs==1.4.3, argparse==1.2.1, docopt==0.6.2, base58==0.2.2, colorama==0.3.7, dnspython==1.12.0, ecdsa==0.13, envparse==0.2.0, jsonrpc==1.2, jsonrpclib==0.1.7, jsonschema==2.5.1, pbkdf2==1.3, pyyaml==3.12, qrcode==5.2.2, requests==2.9.1, seccure==0.3.1.3, attrs==18.1.0, pyasn1, pyasn1-modules, service_identity==16.0.0, six==1.9.0, slowaes==0.1a1, txJSON-RPC==0.5, wsgiref==0.1.2, zope.interface==4.3.3, protobuf==3.2.0, keyring==10.4.0, git+https://github.com/lbryio/lbryschema.git@v0.0.16#egg=lbryschema, git+https://github.com/lbryio/lbryum.git#egg=lbryum, git+https://github.com/lbryio/lbry.git@v0.20.4#egg=lbrynet, asn1crypto, cryptography==2.2.2, pyopenssl==17.4.0, treq==17.8.0, funcsigs, mock, pbr, unqlite
 
 # (str) Custom source folders for requirements
 # Sets custom source for any requirements with recipes
@@ -148,7 +148,7 @@ android.react_src = ./app
 
 # (list) Gradle dependencies to add (currently works only with sdl2_gradle
 # bootstrap)
-android.gradle_dependencies = com.android.support:appcompat-v7:23.4.0, com.facebook.react:react-native:0.55.3, com.mixpanel.android:mixpanel-android:5+, com.google.android.gms:play-services-gcm:11.0.4+
+android.gradle_dependencies = com.android.support:appcompat-v7:26.0.1, com.facebook.react:react-native:0.55.3, com.mixpanel.android:mixpanel-android:5+, com.google.android.gms:play-services-gcm:11.0.4+
 
 # (str) python-for-android branch to use, defaults to master
 #p4a.branch = stable

buildozer.spec.vagrant

@@ -36,7 +36,7 @@ version.filename = %(source.dir)s/main.py
 
 # (list) Application requirements
 # comma seperated e.g. requirements = sqlite3,kivy
-requirements = openssl, sqlite3, hostpython2, android, pyjnius, certifi==2018.4.16, constantly, incremental, functools32, miniupnpc==1.9, gmpy==1.17, twisted==16.6.0, appdirs==1.4.3, argparse==1.2.1, docopt==0.6.2, base58==0.2.2, colorama==0.3.7, dnspython==1.12.0, ecdsa==0.13, envparse==0.2.0, jsonrpc==1.2, jsonrpclib==0.1.7, jsonschema==2.5.1, pbkdf2==1.3, pyyaml==3.12, qrcode==5.2.2, requests==2.9.1, seccure==0.3.1.3, attrs==18.1.0, pyasn1, pyasn1-modules, service_identity==16.0.0, six==1.9.0, slowaes==0.1a1, txJSON-RPC==0.5, wsgiref==0.1.2, zope.interface==4.3.3, protobuf==3.2.0, keyring==10.4.0, git+https://github.com/lbryio/lbryschema.git@v0.0.15#egg=lbryschema, git+https://github.com/lbryio/lbryum.git#egg=lbryum, git+https://github.com/lbryio/lbry.git#egg=lbrynet, asn1crypto, cryptography==2.2.2, pyopenssl==17.4.0, treq==17.8.0, funcsigs, mock, pbr, unqlite
+requirements = openssl, sqlite3, hostpython2, android, distro, pyjnius, certifi==2018.4.16, constantly, incremental, functools32, miniupnpc==1.9, gmpy==1.17, twisted==16.6.0, appdirs==1.4.3, argparse==1.2.1, docopt==0.6.2, base58==0.2.2, colorama==0.3.7, dnspython==1.12.0, ecdsa==0.13, envparse==0.2.0, jsonrpc==1.2, jsonrpclib==0.1.7, jsonschema==2.5.1, pbkdf2==1.3, pyyaml==3.12, qrcode==5.2.2, requests==2.9.1, seccure==0.3.1.3, attrs==18.1.0, pyasn1, pyasn1-modules, service_identity==16.0.0, six==1.9.0, slowaes==0.1a1, txJSON-RPC==0.5, wsgiref==0.1.2, zope.interface==4.3.3, protobuf==3.2.0, keyring==10.4.0, git+https://github.com/lbryio/lbryschema.git@v0.0.16#egg=lbryschema, git+https://github.com/lbryio/lbryum.git#egg=lbryum, git+https://github.com/lbryio/lbry.git@v0.20.4#egg=lbrynet, asn1crypto, cryptography==2.2.2, pyopenssl==17.4.0, treq==17.8.0, funcsigs, mock, pbr, unqlite
 
 # (str) Custom source folders for requirements
 # Sets custom source for any requirements with recipes
@@ -86,10 +86,10 @@ fullscreen = 0
 #android.presplash_color = #FFFFFF
 
 # (list) Permissions
-android.permissions = ACCESS_NETWORK_STATE,BLUETOOTH,INTERNET,READ_EXTERNAL_STORAGE,WRITE_EXTERNAL_STORAGE
+android.permissions = ACCESS_NETWORK_STATE,BLUETOOTH,INTERNET,READ_EXTERNAL_STORAGE,READ_PHONE_STATE,WRITE_EXTERNAL_STORAGE
 
 # (int) Android API to use
-android.api = 23
+android.api = 26
 
 # (int) Minimum API required
 android.minapi = 21

p4a/pythonforandroid/bootstraps/lbry/build/templates/build.tmpl.gradle

@@ -11,6 +11,9 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
+        maven {
+            url 'https://maven.google.com'
+        }
         maven {
             // All of React Native (JS, Android binaries) is installed from npm
             url "$rootDir/react/node_modules/react-native/android"

src/main/java/io/lbry/browser/LbrynetService.java

@@ -2,12 +2,15 @@ package io.lbry.browser;
 
 import android.app.Activity;
 import android.app.Notification;
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.Intent;
 import android.content.Context;
 import android.os.Bundle;
 import android.os.Binder;
 import android.os.IBinder;
+import android.support.v4.app.NotificationCompat;
 import android.util.Log;
 
 import java.io.File;
@@ -30,13 +33,43 @@ import org.renpy.android.ResourceManager;
  */
 public class LbrynetService extends PythonService {
 
+    private static final String NOTIFICATION_CHANNEL_ID = "io.lbry.browser.DAEMON_NOTIFICATION_CHANNEL";
+
     public static String TAG = "LbrynetService";
 
     public static LbrynetService serviceInstance;
 
     @Override
     public boolean canDisplayNotification() {
-        return false;
+        return true;
+    }
+
+    @Override
+    protected void doStartForeground(Bundle extras) {
+        String serviceTitle = extras.getString("serviceTitle");
+        String serviceDescription = "The LBRY Browser daemon service is running in the background.";
+
+        Context context = getApplicationContext();
+
+        NotificationManager notificationManager =
+            (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
+        NotificationChannel channel = new NotificationChannel(
+            NOTIFICATION_CHANNEL_ID, "LBRY Browser", NotificationManager.IMPORTANCE_LOW);
+        channel.setDescription("LBRY Broswer daemon service notification channel");
+        channel.setShowBadge(false);
+        notificationManager.createNotificationChannel(channel);
+
+        Intent contextIntent = new Intent(context, MainActivity.class);
+        PendingIntent pIntent = PendingIntent.getActivity(context, 0, contextIntent, PendingIntent.FLAG_UPDATE_CURRENT);
+        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL_ID);
+        Notification notification = builder.setContentTitle(serviceTitle)
+                                           .setContentText(serviceDescription)
+                                           .setContentIntent(pIntent)
+                                           .setWhen(System.currentTimeMillis())
+                                           .setSmallIcon(R.drawable.ic_lbry)
+                                           .setOngoing(true)
+                                           .build();
+        startForeground(1, notification);
     }
 
     @Override

src/main/java/io/lbry/browser/MainActivity.java

@@ -51,6 +51,8 @@ public class MainActivity extends Activity implements DefaultHardwareBackBtnHand
 
     public static final String DEVICE_ID_KEY = "deviceId";
 
+    public static final String SETTING_KEEP_DAEMON_RUNNING = "keepDaemonRunning";
+
     /**
      * Flag which indicates whether or not the service is running. Will be updated in the
      * onResume method.
@@ -218,7 +220,7 @@ public class MainActivity extends Activity implements DefaultHardwareBackBtnHand
     protected void onDestroy() {
         // check service running setting and end it here
         SharedPreferences sp = getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE);
-        boolean shouldKeepDaemonRunning = sp.getBoolean("keepDaemonRunning", true);
+        boolean shouldKeepDaemonRunning = sp.getBoolean(SETTING_KEEP_DAEMON_RUNNING, true);
         if (!shouldKeepDaemonRunning) {
             serviceRunning = isServiceRunning(LbrynetService.class);
             if (serviceRunning) {

src/main/java/io/lbry/browser/reactmodules/DaemonServiceControlModule.java

@@ -3,12 +3,14 @@ package io.lbry.browser.reactmodules;
 import android.app.Activity;
 import android.content.Context;
 import android.content.pm.ActivityInfo;
+import android.content.SharedPreferences;
 
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReactContextBaseJavaModule;
 import com.facebook.react.bridge.ReactMethod;
 
 import io.lbry.browser.LbrynetService;
+import io.lbry.browser.MainActivity;
 import io.lbry.browser.ServiceHelper;
 
 public class DaemonServiceControlModule extends ReactContextBaseJavaModule {
@@ -33,4 +35,14 @@ public class DaemonServiceControlModule extends ReactContextBaseJavaModule {
     public void stopService() {
         ServiceHelper.stop(context, LbrynetService.class);
     }
+
+    @ReactMethod
+    public void setKeepDaemonRunning(boolean value) {
+        if (context != null) {
+            SharedPreferences sp = context.getSharedPreferences(MainActivity.SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE);
+            SharedPreferences.Editor editor = sp.edit();
+            editor.putBoolean(MainActivity.SETTING_KEEP_DAEMON_RUNNING, value);
+            editor.commit();
+        }
+    }
 }

src/main/java/io/lbry/browser/reactmodules/DownloadManagerModule.java

@@ -1,10 +1,13 @@
 package io.lbry.browser.reactmodules;
 
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
+import android.os.Build;
 import android.support.v4.app.NotificationCompat;
 import android.support.v4.app.NotificationManagerCompat;
 
@@ -34,6 +37,10 @@ public class DownloadManagerModule extends ReactContextBaseJavaModule {
 
     private static final String GROUP_DOWNLOADS = "io.lbry.browser.GROUP_DOWNLOADS";
 
+    private static final String NOTIFICATION_CHANNEL_ID = "io.lbry.browser.DOWNLOADS_NOTIFICATION_CHANNEL";
+
+    private static boolean channelCreated = false;
+
     public static final String NOTIFICATION_ID_KEY = "io.lbry.browser.notificationId";
 
     public static final int GROUP_ID = 0;
@@ -54,6 +61,18 @@ public class DownloadManagerModule extends ReactContextBaseJavaModule {
         return "LbryDownloadManager";
     }
 
+    private void createNotificationChannel() {
+        // Only applies to Android 8.0 Oreo (API Level 26) or higher
+        if (!channelCreated && Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            NotificationManager notificationManager =
+                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
+            NotificationChannel channel = new NotificationChannel(
+                NOTIFICATION_CHANNEL_ID, "LBRY Downloads", NotificationManager.IMPORTANCE_LOW);
+            channel.setDescription("LBRY file downloads");
+            notificationManager.createNotificationChannel(channel);
+        }
+    }
+
     private void createNotificationGroup() {
         if (!groupCreated) {
             Intent intent = new Intent(context, NotificationDeletedReceiver.class);
@@ -61,7 +80,7 @@ public class DownloadManagerModule extends ReactContextBaseJavaModule {
 
             PendingIntent pendingIntent = PendingIntent.getBroadcast(context, GROUP_ID, intent, 0);
             NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
-            NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
+            NotificationCompat.Builder builder = new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL_ID);
             builder.setContentTitle("Active downloads")
                    .setContentText("Active downloads")
                    .setSmallIcon(R.drawable.ic_file_download_black_24dp)
@@ -84,10 +103,11 @@ public class DownloadManagerModule extends ReactContextBaseJavaModule {
 
     @ReactMethod
     public void startDownload(String id, String fileName) {
+        createNotificationChannel();
         createNotificationGroup();
 
         NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
-        NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
+        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL_ID);
         // The file URI is used as the unique ID
         builder.setContentIntent(getLaunchPendingIntent(id))
                .setContentTitle(String.format("Downloading %s...", fileName))
@@ -114,6 +134,7 @@ public class DownloadManagerModule extends ReactContextBaseJavaModule {
             return;
         }
 
+        createNotificationChannel();
         createNotificationGroup();
         NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
         NotificationCompat.Builder builder = builders.get(notificationId);