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POandroid custom view obtainStyledAttributes
 

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  1. POandroid custom view obtainStyledAttributes
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    <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>
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    1. USHolger Will
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    1. COSorry, i just realised that a.getString(R.styleable.testview_test) is only null during designtime but works great in runtime.
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      1. USHolger Will
    2. COand remove this also android:text="@string/hello_world"
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      1. USUnknown
 

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