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    <p>The library project has a Customview <code>Spinnerbutton</code> which extends TextView (in you case it may be different. For testing i extended TextView).</p> <p>Now if i understand correctly this view is used in android project and you need to set the style to that custom view which can be done as below. </p> <p>Use the style in android library project as the parent style and then customize the style in android project <code>styles.xml</code>. Now set the style to the customview.</p> <pre><code>package com.example.customviewattributes.p1; import com.example.customviewattributes.R; import android.content.Context; import android.content.res.TypedArray; import android.util.AttributeSet; import android.util.Log; import android.widget.TextView; public class Spinnerbutton extends TextView{ public Spinnerbutton(Context context) { this(context, null); } public Spinnerbutton(Context context, AttributeSet attrs) { this(context, attrs, 0); } public Spinnerbutton(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // real work here TypedArray a = context.getTheme().obtainStyledAttributes( attrs, R.styleable.Spinnerbutton, 0, 0 ); try { int textStyleId = a.getResourceId( R.styleable.Spinnerbutton_myTextAppearence, -1); Log.i("................ID is",""+textStyleId); // to make sure i logged the id this.setText("hello"); this.setTextAppearance(context,textStyleId); // set the style to text } finally { // release the TypedArray so that it can be reused. a.recycle(); } } } </code></pre> <p>styles.xml</p> <pre><code>&lt;resources&gt; &lt;style name="AppBaseTheme" parent="android:Theme.Light"&gt; &lt;item name="android:textViewStyle"&gt;@style/QText&lt;/item&gt; &lt;/style&gt; &lt;style name="AppTheme" parent="AppBaseTheme"&gt; &lt;/style&gt; &lt;style name="QText" parent="@android:style/TextAppearance.Medium"&gt; &lt;item name="android:textSize"&gt;20sp&lt;/item&gt; &lt;item name="android:textColor"&gt;@color/ccolor&lt;/item&gt; &lt;item name="android:textStyle"&gt;bold&lt;/item&gt; &lt;item name="android:typeface"&gt;sans&lt;/item&gt; &lt;/style&gt; &lt;/resources&gt; </code></pre> <p>attrs.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;resources&gt; &lt;declare-styleable name="Spinnerbutton"&gt; &lt;attr name="myTextAppearence" format="reference" /&gt; &lt;/declare-styleable&gt; &lt;/resources&gt; </code></pre> <p>colors.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;resources&gt; &lt;color name="ccolor"&gt;#ff3232&lt;/color&gt; &lt;/resources&gt; </code></pre> <p>All the above in library project.</p> <p>Now in Another Android Project</p> <p>activity_main.xml</p> <pre><code>&lt;RelativeLayout 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" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" &gt; &lt;com.example.customviewattributes.p1.Spinnerbutton android:id="@+id/sbp" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="8dp" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>In MainActivity.java</p> <pre><code>setContentView(R.layout.activity_main); com.example.customviewattributes.p1.Spinnerbutton cv = (Spinnerbutton) findViewById(R.id.sbp); cv.setTextAppearance(this,R.style.QText1); cv.setText("hello"); </code></pre> <p>styles.xml</p> <pre><code>&lt;resources&gt; &lt;style name="AppBaseTheme" parent="android:Theme.Light"&gt; &lt;item name="android:textViewStyle"&gt;@style/QText&lt;/item&gt; &lt;/style&gt; &lt;style name="AppTheme" parent="AppBaseTheme"&gt; &lt;/style&gt; &lt;style name="QText1" parent="@style/QText"&gt; &lt;item name="android:textSize"&gt;50sp&lt;/item&gt; &lt;item name="android:textColor"&gt;@color/ccolor&lt;/item&gt; &lt;item name="android:textStyle"&gt;bold&lt;/item&gt; &lt;item name="android:typeface"&gt;sans&lt;/item&gt; &lt;/style&gt; &lt;/resources&gt; </code></pre> <p>colors.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;resources&gt; &lt;color name="ccolor"&gt;#4F47B7&lt;/color&gt; &lt;/resources&gt; </code></pre> <p>Snap</p> <p>This is for android project</p> <p><img src="https://i.stack.imgur.com/OOLbE.png" alt="enter image description here"></p> <p>Now if i run library project as a normal android project</p> <p>Snap</p> <p><img src="https://i.stack.imgur.com/XAEYT.png" alt="enter image description here"></p>
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    1. USValery Viktorovsky
    1. USRaghunandan
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    1. COThank you very much for your effort. The downside I guess of your approach is that in the main app project, I can only use styles that were predefined in the library project, right?
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    2. CO@Ascorbin yes. but i guess there is a solution for what you asked. I am also thinking of alternatives. But the above should work if you want to customize the appearance.
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    3. CO@Ascorbin you can customize the parent style.
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