Develop Reference

No resource identifier found for attribute '' in package Android Layout

I have the following layout in Android Studio 2.1
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:mapbox="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.kea.trimetrail.MainActivityFragment"
tools:showIn="#layout/activity_main">
<com.mapbox.mapboxsdk.maps.MapView
android:id="#+id/mapview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
mapbox:accessToken="#string/mapbox_access_token"/>
</RelativeLayout>
It displays the following error:
No resource identifier found for attribute 'accessToken' in package 'com.example.myapp'
In this case, the error is generated building a simple Mapbox application. I'm developing mapbox from source (yes, I need the source build, not the pre-built).
See:
https://github.com/mapbox/mapbox-gl-native/blob/master/INSTALL.md
The source tree is for multiple platforms, I'm using:
https://github.com/mapbox/mapbox-gl-native/tree/master/platform/android
The source build is located as a dependent library located at:
myapp/app/libs/mapbox-gl-native/platform/android
I've tried importing the module and more using other similar posts, but nothing helps.
While a solution to my particular issue would be awesome, simply understanding the cause of the message might help too. Everything I read is about specific solutions to similar messages, but I can't find any information about the message itself.
Thx

Not sure, but looks like they changed the name from accessToken to access_token. I can't tell for sure because this just brings up a new error. I'll assume the new error is something beyond the old error and not instead of.

Error:(9) Error: Suspicious namespace and prefix combination [NamespaceTypo] when building signed apk release

I've checked online for a solution tried solutions from this page: Error: Suspicious namespace and prefix combination [NamespaceTypo] when I try create Signed APK and also errors in hello world xml but there's no solution. The funny thing is when I try to build a debug of the app or a release for tv and wear everything works well. Error:
(9) Error: Suspicious namespace and prefix combination [NamespaceTypo]
xmlns:app="http://schemas.android.com/tools"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Explanation for issues of type "NamespaceTypo":
Accidental misspellings in namespace declarations can lead to some very
obscure error messages. This check looks for potential misspellings to help track these down.
1 errors, 0 warnings
Layout file part of the code:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:materialdesign="http://schemas.android.com/apk/res-auto"
xmlns:app="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal">
A solution to this is very helpful

Instead of what you have on line 3:
xmlns:app="http://schemas.android.com/tools"
Use:
xmlns:tools="http://schemas.android.com/tools"

Please change your namespace
xmlns:app="http://schemas.android.com/tools"
to
xmlns:app="http://schemas.android.com/apk/res-auto"

Fixed the problem...I had been working on the project using Android Studio version 1.0 and got the problem when I updated to version 1.5.1 So all I did is just getting back to the old version and things were okay, I have no idea why this is the case...

You can reproduce those errors by using the tool Analyse->Inspect code in android studio.
in the xml make sure that
xmlns:app="http://schemas.android.com/apk/res-auto"
and
xmlns:tools="http://schemas.android.com/tools".
If you can write like xmlns:app="http://schemas.android.com/tools" ,you will get an error.

Android: importing projects/libraries?

I am trying to use code from a project that I downloaded from Github, however I am consistently getting errors.
Is there more steps needed to use a project than importing it into eclipse?
I am currently just copying and pasting code from the downloaded project to mine.
Attempting to use the following:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res/com.mikhaellopez.circularimageviewsample"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:orientation="vertical" >
<com.mikhaellopez.circularimageview.CircularImageView
android:layout_width="250dp"
android:layout_height="250dp"
android:src="#drawable/image"
app:border="true"
app:border_color="#color/GrayLight"
app:border_width="4dp"
app:shadow="true" />
</LinearLayout>
But getting the error:
Multiple annotations found at this line:
- error: No resource identifier found for attribute 'border_color' in package
'com.mikhaellopez.circularimageviewsample'
- error: No resource identifier found for attribute 'shadow' in package
'com.mikhaellopez.circularimageviewsample'
- error: No resource identifier found for attribute 'border' in package
'com.mikhaellopez.circularimageviewsample'
- error: No resource identifier found for attribute 'border_width' in package
'com.mikhaellopez.circularimageviewsample'

Is there more steps needed to use a project than importing it into eclipse?
Well, that depends.
I am currently just copying and pasting code from the downloaded project to mine.
Depending upon how that code is written, that may not work well.
But getting the error:
Change:
xmlns:app="http://schemas.android.com/apk/res/com.mikhaellopez.circularimageviewsample"
to:
xmlns:app="http://schemas.android.com/apk/res-auto"
as your app does not have the package name of com.mikhaellopez.circularimageviewsample, apparently.

Custom XML error with Android Build Tools (0.4.2) -- No resource identifier found for attribute 'gapWidth' in package 'xxx.xxxx.'

Updated to the latest Android Build tools (0.4.2) and ran into the following when attempting to assemble:
/AndroidApp/App/build/res/all/flavor/debug/layout/fragment.xml:84:
error: No resource identifier found for attribute 'gapWidth' in package 'com.viewpagerindicator'
RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/build/res/com.viewpagerindicator"
android:layout_width="match_parent"
android:layout_height="match_parent" >

Since flavors may use a different packagename, instead of specifying the package name in the custom namespace, use: 'http://schemas.android.com/apk/res-auto'.

Update your custom XML link paths to use build instead of apk.
Was, in the fragment.xml file
xmlns:app="http://schemas.android.com/apk/res/com.viewpagerindicator"
Now, to this:
xmlns:app="http://schemas.android.com/build/res/com.viewpagerindicator"

How to get "?android:attr/actionBarSize" with Compatibility Library

I'm trying to use Fragments and ActionBar in a Android 2.2 project. There is some error when using "?android:attr/actionBarSize", how to get and set that value correctly?
Example:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/frags">
<fragment class="com.example.android.hcgallery.TitlesFragment"
android:id="#+id/frag_title"
android:visibility="gone"
android:layout_marginTop="?android:attr/actionBarSize"
android:layout_width="#dimen/titles_size"
android:layout_height="match_parent" />
<fragment class="com.example.android.hcgallery.ContentFragment"
android:id="#+id/frag_content"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
Error: No resource found that matches the given name (at 'layout_marginTop' with value '?android:attr/actionBarSize').

You should just use:
android:layout_marginTop="?attr/actionBarSize"
See http://developer.android.com/training/basics/actionbar/overlaying.html
"...The one with the android: prefix is for versions of Android that
include the style in the platform and the one without the prefix is
for older versions that read the style from the Support Library..."
For me replacing
android:layout_marginTop="?android:attr/actionBarSize"
with
android:layout_marginTop="?attr/actionBarSize"
helped to launch app on Android 2.2 and Android 4.3 without any issues.

I think the problem is that actionbar comes with android 3.0 and you are using 2.2. But there is a way to skip this by a extension called "actionbarsherlock".