通知がオレオに表示されない
通常の通知ビルダーはAndroid Oに通知を表示しません。
Android 8 Oreoに通知を表示する方法を教えてください。
Android Oで通知を表示するために追加する新しいコードはありますか？
Android Oでは チャンネルを使用する必要があります あなたのNotification Builderで
以下はサンプルコードです。
// 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();
またはHandlingとの互換性あり：
NotificationCompat notification =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.notification_icon)
.setContentTitle("My notification")
.setContentText("Hello World!")
.setChannelId(CHANNEL_ID).build();
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.createNotificationChannel(mChannel);
// Issue the notification.
mNotificationManager.notify(notifyID , notification);
簡単な修正が必要な場合は、次のコードを使用します。
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
mNotificationManager.createNotificationChannel(mChannel);
}
更新： NotificationCompat.Builderリファレンス
NotificationCompat.Builder(Context context)
このコンストラクタはAPIレベル26.0.0で非推奨になりました。
Builder(Context context, String channelId)
新しいコンストラクタでsetChannelIdする必要はありません。
そして、あなたは現在26.0.2の最新のAppCompatライブラリを使うべきです。
compile "com.Android.support:appcompat-v7:26.0.+"
YouTube上のAndroid開発者チャネル からのソース
また、 公式のAndroid Docs もチェックできます。
この回答 に加えて、使用する前に通知チャネルを作成する必要があります。
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);
}
また、targetSdkVersionが26以上の場合にのみチャンネルを使用する必要があります。
NotificationCompat.Builderを使用している場合は、サポートライブラリのベータ版に更新する必要もあります。 https://developer.Android.com/topic/libraries/support-library/revisions.html#26- 0-0-beta2 （compat BuilderでsetChannelIdを呼び出すことができるように）。
このライブラリの更新によりminSdkLevelが14に上がるので注意してください。
ここで私はインテントハンドリングを用いていくつかのクイックソリューション関数を投稿します
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());
}
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;
}
}
Android O用のAndroid Notification Demo App、およびそれより低いAPIバージョン。これが GitHub-Demo 1 および GitHub-Demo 2 に最適なデモアプリです。
このコードを試してください：
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;
}
}
}26以降のSDKバージョンでプッシュ通知を受け取れない場合
あなたの解決策はここにあります：
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）
- >ここでは、26以降のSDKバージョンで構成されているあなたのデバイスでchannel_idを使用してプッシュ通知を取得します。
- > NotificationCompat.Builder(context)は廃止予定のメソッドであるため、2つのパラメータを持つ更新版を使用します。1つはcontext、もう1つはchannel_idです。
- > NotificationCompat.Builder(context, channel_id)更新メソッドそれを試してみてください。
- > 26+ SDKバージョンのデバイスでは、毎回channel_idを作成します。
これはfirebase apiバージョン11.8.0のバグです。ですから、APIバージョンを減らしても、この問題には直面しません。
このクラスをAndroid 8 Notificationに使用します
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());
}
}
これがあなたのやり方です
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());
}
完全なチュートリアルを=> https://developer.Android.com/training/notify-user/build-notification
通知チャネル機能は、APIレベル26（オレオ）から追加されています。以下のコードは私の側ではうまく機能しています。
private void sendNotification(Context ctx, String title, int notificationNumber, String message, String subtext, Intent intent) {
try {
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_RIDE_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();
}
}
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())
}
}
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());
}
上記の解決策を試した後でこれに苦しんでいる人のために、通知チャンネルを作成するときに使われるチャンネルIDがNotificationビルダーで設定したチャンネルIDと 同一 であることを確認してください。
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)
CHANNEL_ID in NotificationChannelおよびNotification.Builderは同じでなければなりません。次のコードを試してください。
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);
Android Oreoでは、通知アプリはチャンネルとNotificationHelperクラスを使用して行われます。チャンネルIDとチャンネル名が必要です。
まず、NotificationHelperクラスを作成しなければなりません
パブリッククラスNotificationHelperはContextWrapperを拡張します。
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 Notification.Builder getEDMTChannelNotification(String title,String body)
{
return new Notification.Builder(getApplicationContext(),EDMT_CHANNEL_ID)
.setContentText(body)
.setContentTitle(title)
.setSmallIcon(R.mipmap.ic_launcher_round)
.setAutoCancel(true);
}
}
アクティビティxmlファイルにボタンを作成してから、メインアクティビティに
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());
}
});
}
その後、urプロジェクトを実行してください
次のメソッドは show Notification を表示し、ビッグテキストとフリーズを有効にします（通知はユーザーがスワイプした後も削除されません）。 NotificationManagerサービスが必要です
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());
}
通知を削除する方法
public static void removeNotification(Context context){
NotificationManager notificationManager =
(NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
notificationManager.cancelAll();
}
ソース リンク
NotificationCompat.Builder(Context context)
android Oreo以上のバージョンではすでに非推奨です。あなたはを使用するように実装を変更することができます
NotificationCompat.Builder(Context context, String channelId)