Using Custom fonts through XML.

1st Create the custom TextView through java,

package com.example.customfont;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.TextView;
public class CustomTextView extends TextView {
    private static final String TAG = "TextView";
    public CustomTextView(Context context) {
        super(context);
    }
    public CustomTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        setCustomFont(context, attrs);
    }
    public CustomTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        setCustomFont(context, attrs);
    }
    private void setCustomFont(Context ctx, AttributeSet attrs) {
        TypedArray a = ctx.obtainStyledAttributes(attrs, R.styleable.TextViewPlus);
        String customFont = a.getString(R.styleable.CustomTextView_customFont);
        setCustomFont(ctx, customFont);
        a.recycle();
    }
    public boolean setCustomFont(Context ctx, String asset) {
        Typeface tf = null;
        try {
        tf = Typeface.createFromAsset(ctx.getAssets(), asset);  
        } catch (Exception e) {
            Log.e(TAG, "Could not get typeface: "+e.getMessage());
            return false;
        }
        setTypeface(tf);  
        return true;
    }
}

Then Add this lines to attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="TextViewPlus">
        <attr name="customFont" format="string"/>
    </declare-styleable>

</resources>

Then implement in main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:foo="http://schemas.android.com/apk/res/com.example.customfont"
    android:orientation="vertical"    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <com.example.customfont.CustomTextView 
        android:id="@+id/textViewPlus1"
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        android:text="@string/app_name"
        foo:customFont="arial.ttf">
    </com.example.customfont.CustomTextView >

</LinearLayout>