java - Android 8.0 Oreo 上不显示通知

Question

我读过有关 Android 8.0 Oreo 上未出现通知的其他 Stackoverflow 文章，但该代码仍然无法在 Android Android api 26 上运行。

代码如下:

    public void notification()
{

    //Create Notification Channel
    String channelId = "";
    String name = "volume";
    int id = 0;
    int importance = NotificationManager.IMPORTANCE_HIGH;

    NotificationChannel mChannel = new NotificationChannel(channelId, name, 
importance);
    mChannel.setShowBadge(true);

    //Create Notification Manager
    Intent resultIntent = new Intent(this, MainActivity.class);

    PendingIntent resultPendingIntent =
            PendingIntent.getActivity(
                    this,
                    0,
                    resultIntent,
                    PendingIntent.FLAG_CANCEL_CURRENT
            );

    NotificationCompat.Builder mBuilder = new 
NotificationCompat.Builder(this, channelId)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setContentTitle("My notification")
            .setContentText("Hello World!")
            .setContentIntent(resultPendingIntent)
            ;

    // Gets an instance of the NotificationManager service
    NotificationManager mNotifyMgr =
            (NotificationManager) 
getSystemService(Context.NOTIFICATION_SERVICE);
    mNotifyMgr.createNotificationChannel(mChannel);

    // Builds the notification and issues it.
    mNotifyMgr.notify(id, mBuilder.build());

}

更新1:

我已经更改了 String channelId = "name"，但它仍然不起作用。我什至尝试了下面的另一组代码，但仍然不起作用:

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

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

    NotificationCompat.Builder builder = new 
NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)
            .setVibrate(new long[]{0, 100, 100, 100, 100, 100})

.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
            .setSmallIcon(R.mipmap.ic_launcher)
            .setContentTitle("Content Title")
            .setContentText("Content Text");

    notificationManager.notify(NOTIFICATION_ID, builder.build());

更新2:

我的build.gradle(项目:测试)如下:

// Top-level build file where you can add configuration options common to 
all sub-projects/modules.

buildscript {

repositories {
    google()
    jcenter()
}
dependencies {
    classpath 'com.android.tools.build:gradle:3.0.0'


    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}
}

allprojects {
repositories {
    google()
    jcenter()
}
}

task clean(type: Delete) {
delete rootProject.buildDir
}

我的build.gradle(模块:app)如下:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "com.example.a0064274652969.test"
        minSdkVersion 26
        targetSdkVersion 26
        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-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}

Answer 1

所以我复制并粘贴了您的原始代码，它运行良好(在模拟器中)，这意味着 channel ID 的空字符串很好，通知 ID 的值为零。

您的错误在其他地方，可能在您设备的 android 设置中)。尝试发布你的 build.gradle 吗？

<小时/>

If you target Android O and post a notification without specifying a valid notifications channel, the notification fails to post and the system logs an error.

对于您的新代码，您不再设置 contentIntent...另外，请务必收到“提醒通知”，您需要将重要性设置为“HIGH”或“MAX”。