Utility to share text and url on Facebook, Twitter and Whatsapp

ShareUtils.java

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.text.TextUtils;
import android.util.Log;
import android.widget.Toast;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.List;

/**
 * Author: Mario Velasco Casquero
 * Date: 02/12/2015
 */
public class ShareUtils {

    /**
     * Share on Facebook. Using Facebook app if installed or web link otherwise.
     *
     * @param activity activity which launches the intent
     * @param text     not used/allowed on Facebook
     * @param url      url to share
     */
    public static void shareFacebook(Activity activity, String text, String url) {
        boolean facebookAppFound = false;
        Intent shareIntent = new Intent(android.content.Intent.ACTION_SEND);
        shareIntent.setType("text/plain");
        shareIntent.putExtra(Intent.EXTRA_TEXT, url);
        shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse(url));

        PackageManager pm = activity.getPackageManager();
        List<ResolveInfo> activityList = pm.queryIntentActivities(shareIntent, 0);
        for (final ResolveInfo app : activityList) {
            if ((app.activityInfo.packageName).contains("com.facebook.katana")) {
                final ActivityInfo activityInfo = app.activityInfo;
                final ComponentName name = new ComponentName(activityInfo.applicationInfo.packageName, activityInfo.name);
                shareIntent.addCategory(Intent.CATEGORY_LAUNCHER);
                shareIntent.setComponent(name);
                facebookAppFound = true;
                break;
            }
        }
        if (!facebookAppFound) {
            String sharerUrl = "https://www.facebook.com/sharer/sharer.php?u=" + url;
            shareIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(sharerUrl));
        }
        activity.startActivity(shareIntent);
    }

    /**
     * Share on Twitter. Using Twitter app if installed or web link otherwise.
     *
     * @param activity activity which launches the intent
     * @param text     text to share
     * @param url      url to share
     * @param via      twitter username without '@' who shares
     * @param hashtags hashtags for tweet without '#' and separated by ','
     */
    public static void shareTwitter(Activity activity, String text, String url, String via, String hashtags) {
        StringBuilder tweetUrl = new StringBuilder("https://twitter.com/intent/tweet?text=");
        tweetUrl.append(TextUtils.isEmpty(text) ? urlEncode(" ") : urlEncode(text));
        if (!TextUtils.isEmpty(url)) {
            tweetUrl.append("&url=");
            tweetUrl.append(urlEncode(url));
        }
        if (!TextUtils.isEmpty(via)) {
            tweetUrl.append("&via=");
            tweetUrl.append(urlEncode(via));
        }
        if (!TextUtils.isEmpty(hashtags)) {
            tweetUrl.append("&hastags=");
            tweetUrl.append(urlEncode(hashtags));
        }
        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(tweetUrl.toString()));
        List<ResolveInfo> matches = activity.getPackageManager().queryIntentActivities(intent, 0);
        for (ResolveInfo info : matches) {
            if (info.activityInfo.packageName.toLowerCase().startsWith("com.twitter")) {
                intent.setPackage(info.activityInfo.packageName);
            }
        }
        activity.startActivity(intent);
    }

    /**
     * Share on Whatsapp (if installed)
     *
     * @param activity activity which launches the intent
     * @param text     text to share
     * @param url      url to share
     */
    public static void shareWhatsapp(Activity activity, String text, String url) {
        PackageManager pm = activity.getPackageManager();
        try {

            Intent waIntent = new Intent(Intent.ACTION_SEND);
            waIntent.setType("text/plain");

            PackageInfo info = pm.getPackageInfo("com.whatsapp", PackageManager.GET_META_DATA);
            //Check if package exists or not. If not then code
            //in catch block will be called
            waIntent.setPackage("com.whatsapp");

            waIntent.putExtra(Intent.EXTRA_TEXT, text + " " + url);
            activity.startActivity(Intent
                    .createChooser(waIntent, activity.getString(R.string.share_intent_title)));

        } catch (PackageManager.NameNotFoundException e) {
            Toast.makeText(activity, activity.getString(R.string.share_whatsapp_not_instaled),
                    Toast.LENGTH_SHORT).show();
        }
    }


    /**
     * Convert to UTF-8 text to put it on url format
     *
     * @param s text to be converted
     * @return text on UTF-8 format
     */
    public static String urlEncode(String s) {
        try {
            return URLEncoder.encode(s, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            Log.wtf("wtf", "UTF-8 should always be supported", e);
            throw new RuntimeException("URLEncoder.encode() failed for " + s);
        }
    }
}