Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import android.content.Context;
import android.text.TextUtils;
import java.lang.reflect.Field;
import java.util.ArrayList;

public class Main {
    /**
     * a helper to get the string fields from the R class
     *
     * @param ctx
     * @return
     */
    public static String[] getFields(Context ctx) {
        Class rStringClass = resolveRClass(ctx.getPackageName());
        if (rStringClass != null) {
            return getDefinedFonts(ctx, rStringClass.getFields());
        }
        return new String[0];
    }

    /**
     * a helper class to resolve the correct R Class for the package
     *
     * @param packageName
     * @return
     */
    private static Class resolveRClass(String packageName) {
        do {
            try {
                return Class.forName(packageName + ".R$string");
            } catch (ClassNotFoundException e) {
                packageName = packageName.contains(".") ? packageName.substring(0, packageName.lastIndexOf('.'))
                        : "";
            }
        } while (!TextUtils.isEmpty(packageName));

        return null;
    }

    /**
     * A helper method to get a String[] out of a fieldArray
     *
     * @param fields R.strings.class.getFields()
     * @return a String[] with the string ids we need
     */
    private static String[] getDefinedFonts(Context ctx, Field[] fields) {
        ArrayList<String> fieldArray = new ArrayList<String>();
        for (Field field : fields) {
            if (field.getName().contains("define_font_")) {
                fieldArray.add(getStringResourceByName(ctx, field.getName()));
            }
        }
        return fieldArray.toArray(new String[fieldArray.size()]);
    }

    /**
     * helper class to retrieve a string by it's resource name
     *
     * @param ctx
     * @param resourceName
     * @return
     */
    private static String getStringResourceByName(Context ctx, String resourceName) {
        String packageName = ctx.getPackageName();
        int resId = ctx.getResources().getIdentifier(resourceName, "string", packageName);
        if (resId == 0) {
            return "";
        } else {
            return ctx.getString(resId);
        }
    }
}