title: android custom view obtainStyledAttributes
body: <p>I'm pretty new to Android and to Java so forgive me if i'm missing something obvious.</p>
  
  <p>I want to write a custom View, and i have problems getting the custom attributes via otainStyledAttributes.
  I have a very simple testcase.
  In Eclipse i create an empty project (package com.example.customview) with the default activity.
  Then i added  an "attrs.xml" file under res/values with the following content:</p>
  
  <pre><code>  &lt;resources&gt;
      &lt;declare-styleable name="testview"&gt;
         &lt;attr name="test" format="string"/&gt;
      &lt;/declare-styleable&gt;
    &lt;/resources&gt;
  </code></pre>
  
  <p>then i add a new class "testview.java" in a new package "com.example.views".</p>
  
  <pre><code>package com.example.views;
  
  import android.content.Context;
  import android.content.res.TypedArray;
  import android.util.AttributeSet;
  import android.widget.LinearLayout;
  import android.widget.TextView;
  
  import com.example.customview.R;
  
  public class testview extends LinearLayout{
  
    public testview(Context context,AttributeSet attrs){
      super(context,attrs);
  
      TextView tv = new TextView(context);
      this.addView(tv);
      TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.testview, 0, 0);
  
      tv.setText(a.getString(R.styleable.testview_test));
  
      a.recycle();
  
  }
  }
  </code></pre>
  
  <p>and finally in activity_main.xml i have:</p>
  
  <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      xmlns:my="http://schemas.android.com/apk/res/com.example.customview"
      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=".MainActivity" &gt;
  
      &lt;com.example.views.testview
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="@string/hello_world" 
          my:test="test"
          /&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>i am able to get the my:test attribute with </p>
  
  <pre><code>attrs.getAttributeValue("http://schemas.android.com/apk/res/com.example.customview","test")
  </code></pre>
  
  <p>but that also works if i put the attribute in any random namespace.</p>
  
  <p>but a.getString(R.styleable.testview_test) is allways null.</p>