Develop Reference

Nutiteq in Android Studio 0.8.14

I was trying to use Nutiteq SDK 3.0 with android studio but I can't get it to work.
All libraries are added, but in layout file when using:
<?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"
android:orientation="vertical" >
<com.nutiteq.ui.MapView
android:id="#+id/mapView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
it throws an error:
> Rendering problems:
The following classes could not be instantiated:
- com.nutiteq.ui.MapView
java.lang.UnsatisfiedLinkError: no nutiteq_maps_sdk in java.library.path
If i import in some class file, it works well and don't give any error
any help?

No resource identifier found for attribute 'indicator_gravity' in package

I was trying to porting the Tree-View-List-Android into my project recently. I have created a project called com.dotnetideas.treeview and added everything in. I can run the demo without any issue. But when I use it in another project, I kept getting “No resource identifier found for attribute 'indicator_gravity' in package com.dotnetideas.treeview” in main_demo.xml.
Here is the xml looks like.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:treeView="http://schemas.android.com/apk/res/com.dotnetideas.treeview"
android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent">
<ListView android:layout_width="0dip" android:layout_height="0dip" android:scrollbars="vertical"
android:visibility="gone"> <!-- Just to test some attributes in IDE -->
</ListView>
<pl.polidea.treeview.TreeViewList android:id="#+id/mainTreeView" android:layout_width="fill_parent"
android:layout_height="fill_parent" treeView:indicator_gravity="right|center_vertical"
android:scrollbars="vertical" android:smoothScrollbar="true"/>
Although I followed the old code to changed the xml namespace from
xmlns:treeView=http://schemas.android.com/apk/res/pl.polidea.treeview
to
xmlns:treeView=http://schemas.android.com/apk/res/com.dotnetideas.treeview.
It doesn’t seem like valid xml namespace.
It turned out that the namespace needs to be
xmlns:treeView="http://schemas.android.com/apk/res-auto"
if we reference as a library project.
This answer from stackoverflow too didnt help.

Android xml layout blank space

Iam developing a HTML5 Android app, and Iam stucked at basic xml layout of Android app. When I run my app in emulator and on my Android smartphone I have unexpected blank space on the right side.
http://i.stack.imgur.com/c3emH.png
Here is code form activity_main.xml file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<WebView android:id="#+id/web_engine"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</LinearLayout>

Android following class could not be found

I'am trying to load a spinner to my layout and keep geting this error:
The following classes could not be found:
- Spinner (Change to android.widget.Spinner, Fix Build Path, Edit XML)
heres my xml:
<?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="match_parent"
android:orientation="vertical" >
<Spinner
android:id="#+id/spn_dates"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="displayDatesToSpiner" />
<ListView
android:id="#+id/LST_bought_products"
android:layout_width="match_parent"
android:layout_height="302dp" >
</ListView>
</LinearLayout>
Thanks

This sometimes happens when you rename the standard AppTheme in your android manifest. It will build and deploy just fine, but the xml design editor won't render it.

This is usually because there's an invalid attribute somewhere.
Remove the onClick and it will work.

Custom elements and package name

When creating a custom element with attributes in Android I need to put the namespace of the application in the layout.
For example:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:whatever="http://schemas.android.com/apk/res/org.example.mypackage"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<org.example.mypackage.MyCustomView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
whatever:my_custom_attribute="Hello, world!" />
</LinearLayout>
Does this also requires that the structure of my project in Eclipse be the same as the name of the Android package as definied in the Manifest - as per the example?
Would this work too:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:whatever="http://schemas.android.com/apk/res/org.mycompany.myproduct"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<org.example.mypackage.MyCustomView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
whatever:my_custom_attribute="Hello, world!" />
</LinearLayout>

Its the package name of your application that should be reflected. So its correct to use it as you are doing.
For example:
In xmlns:whatever="http://schemas.android.com/apk/res/org.mycompany.myproduct the last part org.mycompany.myproduct should be the same as your package name. And you may change xmlns:whatever to anything like xmlns:theblitz but then make sure you do use theblitz as a prefix for your attributes in the xml.
For more info, read this