Using Styles values as custom attributes

attrs.xml

    <declare-styleable name="ButtonProgress">
        <attr name="btnProgressStyle" format="reference|integer" />
    </declare-styleable>

button_progress.xml

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ProgressBar
        android:id="@+id/progress_circular"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />

    <TextView
        android:id="@+id/txt_btn"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clickable="true"/>

</merge>

ButtonProgress.java

package com.zala.widgets;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.Gravity;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.zala.R;
import com.zala.utils.ResourceUtils;
import com.zala.widgets.base.InflatableView;

import butterknife.InjectView;

/**
 * Created by laaptu on 6/9/15.
 */
public class ButtonProgress extends InflatableView {


    @InjectView(R.id.progress_circular)
    ProgressBar progressBar;
    @InjectView(R.id.txt_btn)
    TextView txtBtn;


    private static int DEFAULT_TEXT_SIZE;
    private static int DEFAULT_TEXT_COLOR;
    private static int DEFAULT_BACKGROUND_BG = R.drawable.white_bg;
    private static int DEFAULT_GRAVITY = Gravity.LEFT;

    private static final int[] ATTRS = new int[]{android.R.attr.textSize,
            android.R.attr.textColor,
            android.R.attr.gravity, android.R.attr.background, android.R.attr.text};

    /**
     * Keep in mind these values must be in ascending order i.e from smaller to greater
     * If it is not in ascending order ,your values declared won't be guaranteed to come<br/>
     * So what you can do is just put attributes out there and then do Arrays.sort(ATTRS)
     * and see how value comes, and you must put values in that order
     * http://stackoverflow.com/questions/19034597/get-multiple-style-attributes-with-obtainstyledattributes?lq=1*/

    /**
     * This is similar to
     * <declare-styleable name="ButtonProgress">
     * <attr name="android:textSize" />
     * <attr name="android:textColor" />
     * <attr name="android:background" />
     * </declare-styleable>
     * <p/>
     * which creates an array with following attributes
     */


    @Override
    public int getLayoutId() {
        return R.layout.button_progress;
    }

    public ButtonProgress(Context context) {
        super(context);
    }

    public ButtonProgress(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public ButtonProgress(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void init(Context context, AttributeSet attrs) {
        super.init(context, attrs);
        DEFAULT_TEXT_SIZE = ResourceUtils.getDimension(R.dimen.button_text_size_progress);
        DEFAULT_TEXT_COLOR = ResourceUtils.getColor(R.color.zala_black);
        if (attrs != null) {
            TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.ButtonProgress);
            int styleId = typedArray.getResourceId(R.styleable.ButtonProgress_btnProgressStyle, -1);
            typedArray.recycle();
            if (styleId > 0) {
                typedArray = context.getTheme().obtainStyledAttributes(styleId, ATTRS);
                txtBtn.setTextSize(typedArray.getDimensionPixelSize(0, DEFAULT_TEXT_SIZE));
                txtBtn.setTextColor(typedArray.getColor(1, DEFAULT_TEXT_COLOR));
                txtBtn.setGravity(typedArray.getInt(2, DEFAULT_GRAVITY));
                txtBtn.setBackgroundResource(typedArray.getResourceId(3, DEFAULT_BACKGROUND_BG));
                txtBtn.setText(typedArray.getString(4));
            }

        }
    }
}

layout.xml

  <com.zala.widgets.ButtonProgress
        android:layout_width="match_parent"
        android:layout_height="48dp"
        zala:btnProgressStyle="@style/WhiteButtonStyle" />

styles.xml

 <style name="WhiteButtonStyle">
        <item name="android:textColor">@color/purple</item>
        <item name="android:textSize">@dimen/button_text_size_progress</item>
        <item name="android:gravity">center</item>
        <item name="android:text">@string/go</item>
        <item name="android:background">@drawable/white_bg</item>
</style>