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When i created TextClock widget in layout Android Studio layout preview cahsed and didn't show the changes. But on debug devise widget work perfectly. If I commented it layout preview work successfuly. Another PC Android Studio work successfuly and show TextClock.
Error Layout preview
java.lang.NullPointerException
at android.content.ContentResolver.registerContentObserver(ContentResolver.java:2263)
at android.widget.TextClock.registerObserver(TextClock.java:626)
at android.widget.TextClock.onAttachedToWindow(TextClock.java:545)
at android.view.View.dispatchAttachedToWindow(View.java:19575)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.AttachInfo_Accessor.setAttachInfo(AttachInfo_Accessor.java:44)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:355)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:404)
at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:141)
at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:657)
at com.android.tools.idea.rendering.RenderTask.lambda$inflate$7(RenderTask.java:788)
at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1590)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
TextClock XML code
<TextClock
android:layout_width="120dp"
android:layout_height="35dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginEnd="16dp"
android:format24Hour="dd.MMMyyyy, HH:mm"
android:format12Hour="dd.MMM.yyyy, hh:mm a"
android:textColor="#d0ffffff"
android:textSize="30sp" />
Changing minSdkVersion to 17 and creating layout v17 didn't give any results.
Problem found in Android Studio 3.6, 3.6.1 and 4.0
746
After upgrading to version 1.2.0-alpha03 the layout preview window does not render Chip elements. They are drawn completely blank without any background, stroke, text or icons. This is solely a visual issue with the preview window as Chips are properly rendered when running on a device.
In android, we can create TextClock in XML layout file using <TextClock> element with different attributes like as shown below. If you observe above code snippet, we used android:format12Hour attribute to set the 12 Hours time format based on our requirements.
In android, TextClock is a UI control that is used to show the current date or time as a formatted string. The TextClock provides a date/time in two formats, one is to show the date/time in 24 Hours format and another one is to show the date / time in 12-hour format.
If your layout preview ends up being too different from how the layout will actually look on devices, it can be very confusing. If, for example, you have a bunch of invisible views of which only one at a time can be visible, showing them all in the preview might be chaotic.
Comment your TextClock and refresh your preview, and then uncomment your TextClock. This will fix your issue.
I encountered this problem when I upgraded to AS 3.6.1
163
A fix/workraound is to create a subclass of TextClock
and add this into the created subclass:
@Override
protected void onAttachedToWindow() {
try {
super.onAttachedToWindow();
} catch(Exception e) {
}
}
Source
31
I had the same problem; my workaround was to convert the TextClock to a TextView via rightclick -> convert view as TextClock extends TextView, then the Layout renders, and after the Layout rendered I converted it back to a TextClock.
It's an ugly workaround - not a fix (you have to repeat it after closing Android Studio) - but at least I can see the layout now.
I will report it to Android Studio as a bug and hopefully they fix it
3
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