FileOperation.java

package org.indywidualni.fblite.util;

import android.content.Context;
import android.util.Log;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class FileOperation {

    // read raw files to string (for css files)
    public static String readRawTextFile(Context ctx, int resId) {
        InputStream inputStream = ctx.getResources().openRawResource(resId);
        InputStreamReader inputReader = new InputStreamReader(inputStream);
        BufferedReader buffReader = new BufferedReader(inputReader);
        String line;
        StringBuilder text = new StringBuilder();
        try {
            while ((line = buffReader.readLine()) != null)
                text.append(line);
        } catch (IOException e) {
            return " ";
        }
        return text.toString();
    }

    // method for clearing cache
    public static void deleteCache(Context context) {
        File cache = context.getCacheDir();
        File appDir = new File(cache.getParent());
        if (appDir.exists()) {
            String[] children = appDir.list();
            for (String s : children) {
                if (!s.equals("lib") && !s.equals("shared_prefs") && !s.equals("databases")) {
                    deleteDir(new File(appDir, s));
                    Log.i("TAG", "**************** File /data/data/APP_PACKAGE/" + s + " DELETED *******************");
                }
            }
        }
    }

    // helper method for clearing cache
    private static boolean deleteDir(File dir) {
        if (dir == null)
            return false;
        if (dir.isDirectory()) {
            String[] children = dir.list();
            for (String child : children) {
                boolean success = deleteDir(new File(dir, child));
                if (!success)
                    return false;
            }
        }
        return dir.delete();
    }

}