Question

我需要在Android上显示一个通知，但我找不到合适的解决方案。似乎一切都很完美。

主类的XML （只是ImageButton）： **

<ImageButton
        android:id="@+id/notification"
        android:layout_width="55dp"
        android:layout_height="55dp"
        android:layout_marginBottom="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="8dp"
        android:backgroundTint="@color/colorPrimaryDark"
        android:visibility="invisible"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.35"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.695"
        app:srcCompat="@android:drawable/btn_star_big_on" />

**

初始化按钮：

private void addelement(){
notify = (ImageButton) findViewById(R.id.notification);
}

Notification（）方法：

public void notification (View view){
        Intent intent = new Intent(this, notification.class);
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    NotificationCompat.Builder b = new NotificationCompat.Builder(this);

    b.setAutoCancel(true)
            .setDefaults(Notification.DEFAULT_ALL)
            .setWhen(System.currentTimeMillis())
            .setTicker("Hearty365")
            .setSmallIcon(R.mipmap.ic_launcher_round)
            .setContentTitle("Default notification")
            .setContentText("Lorem ipsum dolor sit amet, consectetur adipiscing elit.")
            .setDefaults(Notification.DEFAULT_LIGHTS| Notification.DEFAULT_SOUND)
            .setContentIntent(contentIntent)
            .setContentInfo("Info");


    NotificationManager notificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.notify(1, b.build());
}

我在ImageButton上调用 notifiction（）方法

notify.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                notification(view);
            }  
        });

现在这是我的通知活动：

public class notification extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_notification);
    }
}

我的通知XML：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.carlosroldan.merlinminerapp.notification">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Info on the notification"
            android:id="@+id/Texto"
            android:textSize="16sp"
            />

</android.support.constraint.ConstraintLayout>

我调试了这个项目，并且它被卡在这个：

上

public boolean performClick() {
        throw new RuntimeException("Stub!");
    }

主要LogCat错误：

07-28 11:17:08.595 1487-2742/? E/NotificationService: No Channel found for pkg=com.example.carlosroldan.merlinminerapp, channelId=null, opPkg=com.example.carlosroldan.merlinminerapp, callingUid=10084, userId=0, incomingUserId=0, notificationUid=10084, notification=Notification(channel=null pri=0 contentView=null vibrate=null sound=default defaults=0x1 flags=0x10 color=0x00000000 vis=PRIVATE)

这是我的LogCat 在运行并尝试执行该方法时：

07-28 11:13:45.062 7553-7553/? I/zygote: Not late-enabling -Xcheck:jni (already on)
07-28 11:13:45.122 7553-7553/? W/zygote: Unexpected CPU variant for X86 using defaults: x86
07-28 11:13:45.779 7553-7553/com.example.carlosroldan.merlinminerapp I/InstantRun: starting instant run server: is main process
07-28 11:13:46.576 7553-7598/com.example.carlosroldan.merlinminerapp D/OpenGLRenderer: HWUI GL Pipeline
07-28 11:13:46.695 7553-7598/com.example.carlosroldan.merlinminerapp I/OpenGLRenderer: Initialized EGL, version 1.4
07-28 11:13:46.695 7553-7598/com.example.carlosroldan.merlinminerapp D/OpenGLRenderer: Swap behavior 1
07-28 11:13:46.695 7553-7598/com.example.carlosroldan.merlinminerapp W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
07-28 11:13:46.695 7553-7598/com.example.carlosroldan.merlinminerapp D/OpenGLRenderer: Swap behavior 0
07-28 11:13:46.705 7553-7598/com.example.carlosroldan.merlinminerapp D/EGL_emulation: eglCreateContext: 0xa39fd3c0: maj 2 min 0 rcv 2
07-28 11:13:46.755 7553-7598/com.example.carlosroldan.merlinminerapp D/EGL_emulation: eglMakeCurrent: 0xa39fd3c0: ver 2 0 (tinfo 0xa4bf2d40)
07-28 11:13:46.803 7553-7598/com.example.carlosroldan.merlinminerapp W/android.hardware.graphics.mapper@2.0::Mapper: getService: found null hwbinder interface
07-28 11:13:46.847 7553-7598/com.example.carlosroldan.merlinminerapp I/vndksupport: sphal namespace is not configured for this process. Loading /system/lib/hw/gralloc.ranchu.so from the current namespace instead.
07-28 11:13:46.972 7553-7598/com.example.carlosroldan.merlinminerapp D/EGL_emulation: eglMakeCurrent: 0xa39fd3c0: ver 2 0 (tinfo 0xa4bf2d40)
07-28 11:13:48.891 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: Do partial code cache collection, code=19KB, data=25KB
07-28 11:13:48.939 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: After code cache collection, code=19KB, data=26KB
07-28 11:13:48.939 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: Increasing code cache capacity to 128KB
07-28 11:13:48.945 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: Do partial code cache collection, code=19KB, data=43KB
07-28 11:13:48.946 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: After code cache collection, code=19KB, data=43KB
07-28 11:13:48.946 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: Increasing code cache capacity to 256KB
07-28 11:13:48.947 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: JIT allocated 72KB for compiled code of void android.widget.TextView.<init>(android.content.Context, android.util.AttributeSet, int, int)
07-28 11:13:48.947 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: Compiler allocated 4MB to compile void android.widget.TextView.<init>(android.content.Context, android.util.AttributeSet, int, int)
07-28 11:13:49.098 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: Do full code cache collection, code=100KB, data=60KB
07-28 11:13:49.101 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: After code cache collection, code=97KB, data=45KB
07-28 11:13:49.891 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: Do partial code cache collection, code=125KB, data=57KB
07-28 11:13:49.896 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: After code cache collection, code=121KB, data=56KB
07-28 11:13:49.896 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: Increasing code cache capacity to 512KB
07-28 11:13:50.904 7553-7598/com.example.carlosroldan.merlinminerapp D/EGL_emulation: eglMakeCurrent: 0xa39fd3c0: ver 2 0 (tinfo 0xa4bf2d40)
07-28 11:13:56.008 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: Do full code cache collection, code=240KB, data=163KB
07-28 11:13:56.009 7553-7558/com.example.carlosroldan.merlinminerapp I/zygote: After code cache collection, code=162KB, data=113KB

由于

Answer 1

尝试使用以下代码，它有效：

public void showNotification(Context context, String title, String message) {
        Intent notifyIntent = new Intent(context, notification.class);
        notifyIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivities(context, 0,
                new Intent[]{notifyIntent}, PendingIntent.FLAG_UPDATE_CURRENT);
        Notification notification = new Notification.Builder(context)
                .setSmallIcon(android.R.drawable.ic_dialog_info)
                .setContentTitle(title)
                .setContentText(message)
                .setAutoCancel(true)
                .setContentIntent(pendingIntent)
                .build();
        notification.defaults |= Notification.DEFAULT_SOUND;
        NotificationManager notificationManager =
                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(1, notification);
    }

Answer 2

来自Android 8 documentation：

Android O引入了通知渠道以提供统一的系统帮助用户管理通知。当你定位Android O时，你必须实现一个或多个通知渠道才能显示通知给您的用户。如果您没有针对Android O，您的应用在Android O上运行时，其行为与在Android 7.0上的行为相同设备

因此，请按照上述文档链接了解如何（1）创建通知频道和（2）在显示通知时使用频道。

Answer 3

自API 26（Android 8.0）起，您需要注册并设置NotificationChannel才能显示通知。

注册NotificationChannel，例如在您的MainActivity中：

// Register NotificationChannels needed for API 26+ to display notification messages
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    NotificationManager mNotificationManager = (NotificationManager)getSystemService(
            Context.NOTIFICATION_SERVICE);
    NotificationChannel infoChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID_INFO,
            getString(R.string.notification_channel_name_info), NotificationManager.IMPORTANCE_DEFAULT);
    infoChannel.setDescription(getString(R.string.notification_channel_description_info));
    infoChannel.enableLights(false);
    infoChannel.enableVibration(false);
    mNotificationManager.createNotificationChannel(infoChannel);
}

为通知定义NotificationChannel：

Notification notification = new NotificationCompat.Builder(getContext())
        (...)
        .setChannelId(NOTIFICATION_CHANNEL_ID_INFO)
        .build();
NotificationManager notificationManager = (NotificationManager)getContext().getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(CAPTURING_ONGOING_NOTIFICATION_ID, notification);

Answer 4

您的活动名称和方法名称相同。重命名任何一个。让我们像这样重命名方法，

showMyNotification方法：

public void showMyNotification (View view){
        Intent intent = new Intent(this, notification.class);
        PendingIntent contentIntent = P

并通过通知（YourActivity）进行调用，

notify.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                showMyNotification(view);
            }  
        });

通知正在显示！

Android 8上未显示通知

4 个答案: