Miscellany.java

package org.indywidualni.fblite.util;

import android.app.Activity;
import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.DisplayMetrics;
import android.util.Log;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Miscellany {

    // "clean" and decode an url, all in one
    public static String cleanAndDecodeUrl(String url) {
        return decodeUrl(cleanUrl(url));
    }

    // "clean" an url and remove Facebook tracking redirection
    private static String cleanUrl(String url) {
        return url.replace("http://lm.facebook.com/l.php?u=", "")
                .replace("https://lm.facebook.com/l.php?u=", "")
                .replace("http://m.facebook.com/l.php?u=", "")
                .replace("https://m.facebook.com/l.php?u=", "")
                .replace("http://0.facebook.com/l.php?u=", "")
                .replace("https://0.facebook.com/l.php?u=", "")
                .replaceAll("&h=.*", "").replaceAll("\\?acontext=.*", "");
    }

    // url decoder, recreate all the special characters
    private static String decodeUrl(String url) {
        return url.replace("%3C", "<").replace("%3E", ">").replace("%23", "#").replace("%25", "%")
                .replace("%7B", "{").replace("%7D", "}").replace("%7C", "|").replace("%5C", "\\")
                .replace("%5E", "^").replace("%7E", "~").replace("%5B", "[").replace("%5D", "]")
                .replace("%60", "`").replace("%3B", ";").replace("%2F", "/").replace("%3F", "?")
                .replace("%3A", ":").replace("%40", "@").replace("%3D", "=").replace("%26", "&")
                .replace("%24", "$").replace("%2B", "+").replace("%22", "\"").replace("%2C", ",")
                .replace("%20", " ");
    }

    // get some information about the device (needed for e-mail signature)
    public static String getDeviceInfo(Activity activity) {
        StringBuilder sb = new StringBuilder();

        try {
            PackageInfo pInfo = activity.getPackageManager().getPackageInfo(
                    activity.getPackageName(), PackageManager.GET_META_DATA);
            sb.append("\nApp Package Name: ").append(activity.getPackageName());
            sb.append("\nApp Version Name: ").append(pInfo.versionName);
            sb.append("\nApp Version Code: ").append(pInfo.versionCode);
        } catch (PackageManager.NameNotFoundException ex) {
            Log.e("Misc: getDeviceInfo", ex.getMessage());
        }

        sb.append("\nOS Version: ").append(System.getProperty("os.version")).append(" (")
                .append(android.os.Build.VERSION.RELEASE).append(")");
        sb.append("\nOS API Level: ").append(android.os.Build.VERSION.SDK_INT);
        sb.append("\nDevice: ").append(android.os.Build.DEVICE);
        sb.append("\nModel: ").append(android.os.Build.MODEL);
        sb.append("\nManufacturer: ").append(android.os.Build.MANUFACTURER);

        DisplayMetrics metrics = new DisplayMetrics();
        activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);

        sb.append("\nScreen: ").append(metrics.heightPixels).append(" x ").append(metrics.widthPixels);
        sb.append("\nLocale: ").append(Locale.getDefault().toString());

        return sb.toString();
    }

    public static void copyTextToClipboard(Context context, String label, String text) {
        ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
        ClipData clip = ClipData.newPlainText(label, text);
        clipboard.setPrimaryClip(clip);
    }

    /**
     * Extracts URL from a given string
     * @param string Text which may contain an URL
     * @return Extracted URL or empty string if URL not found inside
     */
    public static String extractUrl(String string) {
        final Pattern urlPattern = Pattern.compile(
                "(?:^|[\\W])((ht|f)tp(s?):\\/\\/|www\\.)"
                        + "(([\\w\\-]+\\.){1,}?([\\w\\-.~]+\\/?)*"
                        + "[\\p{Alnum}.,%_=?&#\\-+()\\[\\]\\*$~@!:/{};']*)",
                Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
        Matcher matcher = urlPattern.matcher(string);
        int matchStart = 0;
        int matchEnd = 0;
        while (matcher.find()) {
            matchStart = matcher.start(1);
            matchEnd = matcher.end();
        }
        return string.substring(matchStart, matchEnd);
    }

    /**
     * Download an image as Bitmap object (run always outside the Main Thread)
     */
    public static Bitmap getBitmapFromURL(String src) {
        try {
            URL url = new URL(src);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoInput(true);
            connection.connect();
            InputStream input = connection.getInputStream();
            return BitmapFactory.decodeStream(input);
        } catch (IOException e) {
            return null;
        } catch (Exception e) {
            return null;
        }
    }

}