フォント設定可能なTextViewクラス

attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="FontableTextView">
        <attr name="font" format="string"/>
    </declare-styleable>

</resources>

FontableTextView.java

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.widget.TextView;

import apps.ignisamerica.flashlight.R;

/**
 * フォント設定可能なTextViewクラス
 */
public class FontableTextView extends TextView {

    private String mFont;

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

    public FontableTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mFont = readFontFromXml(context, attrs);
        reflectFont(mFont);
    }

    public FontableTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mFont = readFontFromXml(context, attrs);
        reflectFont(mFont);
    }

    public FontableTextView(Context context, String font) {
        super(context);
        mFont = font;
        reflectFont(mFont);
    }

    public FontableTextView(Context context, AttributeSet attrs, String font) {
        super(context, attrs);
        mFont = font;
        reflectFont(mFont);
    }

    public FontableTextView(Context context, AttributeSet attrs, int defStyle, String font) {
        super(context, attrs, defStyle);
        mFont = font;
        reflectFont(mFont);
    }

    /**
     * フォントファイルを読み込む
     *
     * @param context
     * @param attrs
     */
    private String readFontFromXml(Context context, AttributeSet attrs) {
        String font = null;
        try {
            TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FontableTextView);
            font = a.getString(R.styleable.FontableTextView_font);
            a.recycle();
        }catch (Exception e){
            e.printStackTrace();
        }

        return font;
    }

    /**
     * フォントを反映
     */
    private void reflectFont(String font) {
        try {
            Typeface tf = Typeface.createFromAsset(getContext().getAssets(), font);
            setTypeface(tf);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * フォントを取得
     *
     * @return
     */
    public String getFont() {
        return mFont;
    }

    /**
     * フォントを設定
     *
     * @return
     */
    public void setFont(String font) {
        mFont = font;
        reflectFont(font);
    }

}