[英]android custom notification not work with constraint layout
I spend the whole day to figure out why my custom notifications are not being displayed. 我花了一整天的时间弄清楚为什么未显示我的自定义通知。 At the end, it was the problem with constraint layout.
最后,这是约束布局的问题。 When I try to build custom_notification.xml with constraint layout the notification does not show up but if I change to linear layout the notification works.
当我尝试使用约束布局构建custom_notification.xml时,通知不会显示,但是如果我更改为线性布局,则该通知有效。 Can anybody tell me why this is happening?
谁能告诉我为什么会这样吗?
custom_notitication.xml with linear layout (This layout works) 具有线性布局的custom_notitication.xml(此布局有效)
<LinearLayout 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:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="8dp">
<Button
android:id="@+id/button"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Button"
<Button
android:layout_weight="1"
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Button"
/>
</LinearLayout>
custom_notitication.xml with Constraint Layout(this is not working) 具有约束布局的custom_notitication.xml(不起作用)
<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:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="8dp">
<Button
android:id="@+id/button"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Button"
app:layout_constraintEnd_toStartOf="@+id/button2"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent" />
<Button
android:layout_weight="1"
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Button"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toEndOf="@+id/button"
/>
</android.support.constraint.ConstraintLayout>
and kotlin code 和科特林代码
fun getNotification(context: Context): Notification {
val mNotificationManager1: NotificationManager?
val notification: Notification
mNotificationManager1 = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
createChannel(mNotificationManager1)
val contentView = RemoteViews(applicationContext.packageName, R.layout.custom_notifaction)
val mBuilder = NotificationCompat.Builder(applicationContext,"LockScreenTouch")
.setSmallIcon(R.mipmap.ic_launcher)
.setCustomBigContentView(contentView)
notification = mBuilder.build()
mNotificationManager1.notify(PostNotifactionActivity.ONGOING_NOTIFICATION_ID, notification)
return notification
}
@TargetApi(26)
@Synchronized
private fun createChannel(notificationManager: NotificationManager?) {
val name = "lockScreen"
val importance = NotificationManager.IMPORTANCE_DEFAULT
val mChannel = NotificationChannel("LockScreenTouch", name, importance)
mChannel.enableLights(true)
mChannel.lightColor = Color.BLUE
notificationManager!!.createNotificationChannel(mChannel)
}
and my buid.gradle 和我的buid.gradle
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.android.support:support-v4:28.0.0'
Notification layouts use the RemoteViews implementation—the same as widgets. 通知布局使用RemoteViews实现-与小部件相同。
There are very few Views that are compatible with RemoteViews. 与RemoteView兼容的视图很少。 It's only a subset of the native/framework Views (ie no support Views, no library Views, no custom Views), and that subset isn't exhaustive:
它只是本机/框架视图的一个子集(即,不支持视图,没有库视图,没有自定义视图),并且该子集并不详尽:
No other Views will work. 没有其他视图将起作用。
https://developer.android.com/reference/android/widget/RemoteViews https://developer.android.com/reference/android/widget/RemoteViews
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