to diplay some price with " ppD°° " 'pp' are the price in integer and 'D' the type of money like "€", and '°°' the decimals

ExponentView

import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.widget.RelativeLayout;
import android.widget.TextView;

import java.text.DecimalFormat;

import butterknife.Bind;
import butterknife.ButterKnife;

public class ExponentView extends RelativeLayout {

    private static final String TAG = ExponentView.class.getSimpleName();

    private static final String decimalPattern = "###0.00";

    private static final String regularExpression = ",";

    @Bind(R.id.tv_base)
    protected TextView mLabel;

    @Bind(R.id.tv_exponent)
    protected TextView mExponent;

    private int mTextSize;

    private ColorStateList mTextColor;

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

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

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

        init(attrs, defStyleAttr);
    }


    private void init(AttributeSet attrs) {
        init(attrs, 0);
    }

    private void init(AttributeSet attrs, int defStyleAttr) {
        final View rootView = inflate(getContext(), R.layout.custom_exponent_layout, this);
        ButterKnife.bind(rootView);
        mTextSize = -1;
        mTextColor = null;
        final TypedArray typedArray = getContext().getTheme().obtainStyledAttributes(attrs, R.styleable.ExponentView, defStyleAttr, 0);
        try {
            mTextSize = typedArray.getDimensionPixelSize(R.styleable.ExponentView_textSize, mTextSize);
            mTextColor = typedArray.getColorStateList(R.styleable.ExponentView_textColor);
        } finally {
            typedArray.recycle();
        }
        if (mTextSize > 0) {
            float labelSize = (mTextSize / Resources.getSystem().getDisplayMetrics().density);
            float exponentSize = (float) ((mTextSize * 0.75) / Resources.getSystem().getDisplayMetrics().density);
            mLabel.setTextSize(labelSize);
            mExponent.setTextSize(exponentSize);
        }
        if (mTextColor != null) {
            mLabel.setTextColor(mTextColor);
            mExponent.setTextColor(mTextColor);
        }
    }


    public void setText(final double number, final String exponentPrefix) {

        final String stringNumber = String.valueOf(new DecimalFormat(decimalPattern).format(number));
        final String[] splittedNumber = stringNumber.split(regularExpression);

        mLabel.setText(splittedNumber[0]);

        if (splittedNumber.length > 1) {
            mExponent.setText(String.format("%s%s", exponentPrefix, splittedNumber[1]));
        }
    }

    public void setLabelText(final String text) {
        mLabel.setText(text);
    }

    public void setExponentText(final String text) {
        mExponent.setText(text);
    }


}

Example of usage :

XML :

<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

     <com.your.package.ExponentView
                android:id="@+id/tv_product_price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                app:textSize="16sp"
                app:textColor="@color/color_pink" />

</LinearLayout>

Java :

mExponentViewProductPrice.setText(10.50, "€"));