如何使其工作NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder（this，NOTIFICATION_CHANNEL_ID）;

Question

NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);

显示错误：

无法将Builder中的Builder（上下文）应用于（FirebaseMessagingService，java.lang.String）

帮我解决这个问题。

我 尝试了 Notification.Builder notificationBuilder = new Notification.Builder(this, NOTIFICATION_CHANNEL_ID); 和

NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this);

但是它在API 23和API 27中均不起作用。

这是代码

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.graphics.Color;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v7.app.NotificationCompat;

import com.google.firebase.messaging.RemoteMessage;


public class FirebaseMessagingService extends com.google.firebase.messaging.FirebaseMessagingService {
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);

        String notification_title = remoteMessage.getData().get("title");
        String notification_msg = remoteMessage.getData().get("body");
        String from_user_id = remoteMessage.getData().get("from_user_id");
        String click_action = remoteMessage.getData().get("click_action");

        NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        String NOTIFICATION_CHANNEL_ID = "channel_id_01";

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "My Notifications", NotificationManager.IMPORTANCE_HIGH);

            // Configure the notification channel.
            notificationChannel.setDescription("Channel description");
            notificationChannel.enableLights(true);
            notificationChannel.setLightColor(Color.BLUE);
            notificationChannel.setVibrationPattern(new long[]{0, 1000, 500, 1000});
            notificationChannel.enableVibration(true);

            notificationManager.createNotificationChannel(notificationChannel);
        }


        Intent intent = new Intent(click_action);
        intent.putExtra("user_id", from_user_id);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);

        notificationBuilder.setAutoCancel(true).setDefaults(Notification.DEFAULT_ALL).setWhen(System.currentTimeMillis()).setSmallIcon(R.drawable.logo1).setPriority(Notification.PRIORITY_MAX).setContentTitle(notification_title).setContentText(notification_msg).setContentInfo("Info").setContentIntent(pendingIntent);


        int mNotificationId = (int) System.currentTimeMillis();
        notificationManager.notify(mNotificationId, notificationBuilder.build());
    }
}

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.example.android.gabwithus"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
    implementation 'com.android.support:design:28.0.0-alpha3'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    implementation 'com.google.firebase:firebase-auth:16.0.2'
    implementation 'com.google.firebase:firebase-core:16.0.1'
    implementation 'com.google.firebase:firebase-database:16.0.1'
    implementation 'com.google.firebase:firebase-messaging:17.1.0'
    implementation 'com.android.support:support-v4:28.0.0-alpha3'
    implementation 'com.google.firebase:firebase-storage:15.0.0'
    implementation 'com.theartofdev.edmodo:android-image-cropper:2.7.0'
    testImplementation 'junit:junit:4.12'
    implementation 'com.squareup.picasso:picasso:2.5.2'
    implementation 'com.firebaseui:firebase-ui-database:2.0.1'
    implementation 'com.squareup.okhttp:okhttp:2.5.0'
    implementation 'id.zelory:compressor:2.1.0'
    implementation 'com.android.support:support-media-compat:28.0.0-alpha3'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'de.hdodenhof:circleimageview:2.2.0'
    implementation 'com.theartofdev.edmodo:android-image-cropper:2.5.1'
    implementation 'com.facebook.fresco:fresco:1.5.0'

}

apply plugin: 'com.google.gms.google-services'
configurations.all {
    resolutionStrategy.eachDependency { DependencyResolveDetails details ->
        def requested = details.requested
        if (requested.group == 'com.android.support') {
            if (!requested.name.startsWith("multidex")) {
                details.useVersion '25.3.0'
            }
        }
    }
}

Answer 1

问题是您正在使用import android.support.v7.app.NotificationCompat 。 v7.app.NotificationCompat实际上已在版本27.0.0中删除，并且从未更新为支持通知通道。

您应该删除该行，而导入不支持通知通道的android.support.v4.app.NotificationCompat 。

Answer 2

尝试使用此功能，我认为您的问题在这里： details.useVersion '25.3.0'

     configurations.all {
        resolutionStrategy.eachDependency { DependencyResolveDetails details ->
        def requested = details.requested
        if (requested.group == 'com.android.support') {
            if (!requested.name.startsWith("multidex")) {
                details.useVersion '27.1.0'
            }
        }
    }

}

Answer 3

它在所有API中的工作请尝试以下操作：

 public void sendNotification(String messageBody) {
    NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    NotificationCompat.Builder builder =
            new NotificationCompat.Builder(this)
                    .setSmallIcon(R.drawable.ic_enable_notification_icon)
                    .setColor(Color.parseColor("#5878f2"))
                    .setContentTitle(getString(R.string.app_name))
                    .setContentText(messageBody)               
                    .setAutoCancel(true);

    Intent notificationIntent = new Intent(this, MainActivity.class);
    notificationIntent.putExtra("message",messageBody);
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);
    builder.setContentIntent(contentIntent);

    if(Build.VERSION_CODES.O <= Build.VERSION.SDK_INT) {
        builder.setChannelId(createNotificationChannel());
    }

    Notification notification = builder.build();
    notificationManager.notify(211, notification);
}

 @RequiresApi(api = Build.VERSION_CODES.O)
private String createNotificationChannel(){
    String channelId = "demo";
    String channelName = "My demo";
    NotificationChannel mChannel = new NotificationChannel(channelId,channelName, NotificationManager.IMPORTANCE_NONE);
    mChannel.setImportance(NotificationManager.IMPORTANCE_HIGH);

    NotificationManager mNotificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    if (mNotificationManager != null) {
        mNotificationManager.createNotificationChannel(mChannel);
    }
    return channelId;
}

Answer 4

Android O及更高版本需要通知通道。 这是您的一个有效示例。getRequestCode方法用于不同的通知，因此它们不会被替换。 您也可以使用任何数字。 如果您使用相同的数字，通知将自动替换，因此我使用随机数生成器。

  private static int getRequestCode() {
    Random rnd = new Random();
    return 100 + rnd.nextInt(900000);
}


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

    Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setLargeIcon(BitmapFactory.decodeResource(this.getResources(),
                    R.mipmap.ic_launcher))
            .setContentTitle(neplaiTile) // use your own title
            .setContentText(message)    // use your own message
            .setAutoCancel(true)
            .setSound(defaultSoundUri)
            .setContentIntent(pendingIntent)
            .setPriority(Notification.PRIORITY_MAX)
            .setBadgeIconType(Notification.BADGE_ICON_SMALL);


    NotificationManager notificationManager =
            (NotificationManager) 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 notificationManager != null;
        notificationBuilder.setChannelId(NOTIFICATION_CHANNEL_ID);
        notificationManager.createNotificationChannel(notificationChannel);
    }
    assert notificationManager != null;
    notificationManager.notify(getRequestCode() /* Request Code */, notificationBuilder.build());