Button com texto e leftDrawable alinhado

DrawableAlignedButton

// http://stackoverflow.com/questions/9968094/android-how-to-create-a-button-with-image-and-text-that-are-both-centred

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.text.TextPaint;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.widget.Button;

public class DrawableAlignedButton extends Button {

    protected int drawableWidth;
    protected DrawablePositions drawablePosition;
    protected int iconPadding = DisplayUtils.dpToPx(getContext(), 5);

    // Cached to prevent allocation during onLayout
    Rect bounds;

    private enum DrawablePositions {
        NONE,
        LEFT,
        RIGHT
    }

    public DrawableAlignedButton(Context context) {
        super(context);
        bounds = new Rect();
    }

    public DrawableAlignedButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        bounds = new Rect();
    }

    public DrawableAlignedButton(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        bounds = new Rect();
    }

    public void setIconPadding(int padding) {
        iconPadding = padding;
        requestLayout();
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);

        Paint textPaint = getPaint();
        String text = getText().toString();
        textPaint.getTextBounds(text, 0, text.length(), bounds);

        int textWidth = bounds.width();
        int contentWidth = drawableWidth + iconPadding + textWidth;

        int contentLeft = (int) ((getWidth() / 2.0) - (contentWidth / 2.0));
        setCompoundDrawablePadding(-contentLeft + iconPadding);
        switch (drawablePosition) {
            case LEFT:
                setPadding(contentLeft, 0, 0, 0);
                break;
            case RIGHT:
                setPadding(0, 0, contentLeft, 0);
                break;
            default:
                setPadding(0, 0, 0, 0);
        }
    }

    @Override
    public void setCompoundDrawablesWithIntrinsicBounds(Drawable left, Drawable top, Drawable right, Drawable bottom) {
        super.setCompoundDrawablesWithIntrinsicBounds(left, top, right, bottom);
        if (null != left) {
            drawableWidth = left.getIntrinsicWidth();
            drawablePosition = DrawablePositions.LEFT;
        } else if (null != right) {
            drawableWidth = right.getIntrinsicWidth();
            drawablePosition = DrawablePositions.RIGHT;
        } else {
            drawablePosition = DrawablePositions.NONE;
        }
        requestLayout();
    }


}