如何在Oreo上显示通知

Question

在上述V26 API上未显示通知。v25上的通知CSHOWN，但是当我在v27上检查它时，它比通知不会出现。我的代码启动服务并创建通知。

内部主流((

  Intent intent1 = new Intent(this, NotificationService.class);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                ContextCompat.startForegroundService(this, intent1);
            } else {
                startService(intent1);
            }

notificationationservice扩展服务

我称之为示范化的方法，该方法将调用广播媒体。

 @Override
public void onCreate() {
    super.onCreate();
    session = SessionManager.getInstance(getApplicationContext());
    showNotification();
}
private void showNotification() {
    if (session.isNotificationOn() && session.isLogged()) {
        Intent notificationIntent = new Intent(this, NotificationReceiver.class);
        notificationIntent.putExtra(NotificationReceiver.CODE, NotificationReceiver.TYPE_START_CODE);
        sendBroadcast(notificationIntent);
    }
}

NotificationReceiver类

在此类中，我构建通知并通知显示的通知。

 @Override
    public void onReceive(Context context, Intent intent) {
        buildNotification(context);
    }

内部buildNotification((方法

     private void buildNotification(Context context) {
            NotificationCompat.Builder builder = new NotificationCompat.Builder(context,NOTIFICATION_CHANNEL_ID)
                .setSmallIcon(R.drawable.notification)
                .setAutoCancel(false)
                .setOngoing(true)
                .setPriority(NotificationCompat.PRIORITY_MAX)
                .setContentTitle(context.getString(R.string.app_name))  .setContentText(context.getString(R.string.notification_pull_down_information))
                .setShowWhen(false)
                .setColor(Color.BLACK);
        String CHANNEL_ID = "my_channel_01";// The id of the channel.
        CharSequence name = context.getString(R.string.app_name);// The user-visible name of the channel.
        int importance = NotificationManager.IMPORTANCE_HIGH;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            mChannel = new NotificationChannel(CHANNEL_ID, name, importance);
        }
        NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            manager.createNotificationChannel(mChannel);
        }
        manager.notify(notificatioCode, builder.build());
        }

，但在上面的V26上没有出现。请帮助我。

Answer 1

创建一个新类并命名 NotificationUtils ，扩展 ContextWrapper 。

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.content.ContextWrapper;
import android.graphics.Color;
public class NotificationUtils extends ContextWrapper {
    private NotificationManager mManager;
    public static final String ANDROID_CHANNEL_ID = "com.testandroid.pushnotifications.ANDROID";
    public static final String ANDROID_CHANNEL_NAME = "ANDROID CHANNEL";
    public NotificationUtils(Context base) {
        super(base);
        createChannels();
    }
    public void createChannels() {
        // create android channel
        NotificationChannel androidChannel = new NotificationChannel(ANDROID_CHANNEL_ID,
                ANDROID_CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
        // 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(Color.GREEN);
        // Sets whether notifications posted to this channel appear on the lockscreen or not
        androidChannel.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
        getManager().createNotificationChannel(androidChannel);

    private NotificationManager getManager() {
        if (mManager == null) {
            mManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        }
        return mManager;
    }
}

我们指定应将哪些通知发送到 Notification.Builder (Android API 25(构造函数中的频道，在其中我们将其传递给通道ID作为第二个参数。

public Notification.Builder getAndroidChannelNotification(String title, String body) {
    return new Notification.Builder(getApplicationContext(), ANDROID_CHANNEL_ID)
            .setContentTitle(title)
            .setContentText(body)
            .setSmallIcon(android.R.drawable.stat_notify_more)
            .setAutoCancel(true);
}

让我们从任何活动中创建推送通知进行测试，

放入全局范围：

private NotificationUtils mNotificationUtils;

onCreate

初始化

mNotificationUtils = new NotificationUtils(this);

在按钮上单击"测试：

"生成通知：

buttonSend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String title = "Test Notification";
                String text= "Oreo Device Push Notification is here";
                if(!TextUtils.isEmpty(title) && !TextUtils.isEmpty(text)) {
                    Notification.Builder nb = mNotificationUtils.
                            getAndroidChannelNotification(title, text);
                    mNotificationUtils.getManager().notify(101, nb.build());
                }
            }
        });