i started android studio 3.2 recently and when i create a new project it fails syncing and gives error that content is not allowed in prolog and the error was in xml file where it gives an error that attribute android layout is not allowed. i tried many solution provided here but it didn't workout.
<?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=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
Slightly confused about the question, however I faced an issue where I couldn't type in anything in .xml files, so I updated my target SDK in my gradle.build (Module:app) and it worked.
EDIT: SDK version was 28 - Android Studio recommended this version to avoid 'compatibility issues'.
Related
I added a new android wear module based on this Google doc
but I am getting the error described in the title. Here is my layout.
<?xml version="1.0" encoding="utf-8"?>
<android.support.wear.widget.BoxInsetLayout 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"
android:background="#color/dark_grey"
android:padding="#dimen/box_inset_layout_padding"
tools:context=".MainWearActivity"
tools:deviceIds="wear">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="#dimen/inner_frame_layout_padding"
app:boxedEdges="all"> <---this is the offending line
<android.support.v7.widget.AppCompatTextView
android:id="#+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
</FrameLayout>
</android.support.wear.widget.BoxInsetLayout>
Anyone know what's going on? I appreciate explanation as to why I am getting this error.
UPDATE: I removed the redundant android prefix. Android studio requires me to change the app prefix to change to android but even after doing so the error remains. Is it safe time to assume it is a bug?
Based on what Mike M suggested, I right clicked on the error and I selected suppress in Android studio. My Framelayout now looks like this. I do not however currently know what caused the warning.
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="#dimen/inner_frame_layout_padding"
app:boxedEdges="all"
tools:ignore="MissingPrefix">
This seems to work for now.
I searched a lot for this error but ended up seeing that everyone is suggesting of uninstalling android studio and reinstalling it with all sdk work which is not feasible to me. How can we remove this error in a decent way, please refer me to the answer if anyone has already given the right one.
Please use app instead of android.
app:layout_constraintWidth_percent="0.5"
Also, Add one constraint property like below:
app:layout_constraintStart_toStartOf="parent"
or
app:layout_constraintTop_toTopOf="parent"
your_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".MainActivity">
<Button
android:id="#+id/btn_temp"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintWidth_percent="0.5"
android:text="Hello World!"
app:layout_constraintTop_toTopOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
XML CODE:
<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:layout_width="34dp"
android:layout_height="53dp"
android:text="Hello World!"
android:textAppearance="#style/TextAppearance.AppCompat"
android:visibility="visible" />
</LinearLayout
Need help asap.What to do??
I had the same problem yesterday after updating android studio,
Go to Gradle Scripts -> Build.Gradle(Module:app)
change alpha3 to alpha1
implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
to
implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'
Note: [Edit] This solution doesn't work anymore as version codes have been updated, stable version has been released
Just building the project: Build -> Make Project
If that doesn't work try cleaning the project: Build -> Rebuild and Clean Project
That happened to me as well and all I had to do was build the project. Then it was able to render it.
Use this code, it's working fine:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:layout_width="34dp"
android:layout_height="53dp"
android:text="Hello World!"
android:textAppearance="#style/TextAppearance.AppCompat"
android:visibility="visible" />
</LinearLayout>
Here's the entirity of my XML file. The imporant part is the map fragment at the end that gives me this error: "Unexpected namespace prefix found for tag fragment" It doesn't seem to impact the code but I'm curious if anyone knows what's up. I've seen posts saying it's a Lint issue or an Eclipse problem but I'm using the latest version of Android Studio.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:map="http://schemas.android.com/apk/res-auto"
android:background="#FFFFFF"
android:orientation="vertical">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:orientation="horizontal">
<Button
android:id="#+id/button_lakeside_webview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Lakeside"/>
<Button
android:id="#+id/button_spinner_webview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Spinner"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<View
android:id="#+id/colored_bar"
android:layout_width="48dp"
android:layout_height="3dp"
android:background="" />
</LinearLayout>
<!-- Unsure why it complains about the map namespace, the below code is recommended by Google -->
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
map:cameraBearing="0"
map:cameraTilt="30"
map:cameraZoom="16"
map:mapType="normal"
map:uiCompass="false"
map:uiRotateGestures="false"
map:uiScrollGestures="false"
map:uiTiltGestures="false"
map:uiZoomControls="false"
map:uiZoomGestures="false"/>
</LinearLayout>
As you say there is a known bug in the Android Lint. There are a couple of issues filed:
Issue 5002: Bug: Options can't be set on MapFragments included in other layouts
Issue 159039: Custom XML attributes doesn't work on tag in layout XMLs
Issue 53283: Library project namespace only working on root element
The last one updated on Jul 14 2016 states that "Please try again on a newer version of Android Studio (2.2 or greater). If the issue still occurs file a new bug."
As a workaround you can add this property to the fragment to ignore the error (I have tested it and the map:properties work as expected):
tools:ignore="MissingPrefix"
I just updated my Android Studio and Android SDK, and now I can't do anything in my XMLs. It shows the same thing as previous, but I can't add anything and something got messed up.
Example:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="#+id/bocterAppLogo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:src="#drawable/bocterapp"
android:contentDescription=""/>
</LinearLayout>
It error says: "Element ImageView is not allowed here".
Do you have any idea why this has happened?
Cheers!
I had the same problem. Try to exchange the ImageView with the android.support.v7.widget.AppCompatImageView! That solved it for me.
I also had the same problem. In my case, I was using a container from the old support library. So changing
<android.support.constraint.ConstraintLayout ... />
to
<androidx.constraintlayout.widget.ConstraintLayout ... />
solved it for me - with no change to the ImageView.