How to use

isWhatsappInstalled

method

in

com.mega4tech.whatsappapilibrary.WhatsappApi

public synchronized void getContacts(Context context, final GetContactsListener listener) throws WhatsappNotInstalledException {
  if (isWhatsappInstalled()) {
    new AsyncTask<Void, Void, List<WContact>>() {
      @Override
      protected List<WContact> doInBackground(Void... params) {
        Shell.SU.run("am force-stop com.whatsapp");
        db = SQLiteDatabase.openOrCreateDatabase(new File("/data/data/com.whatsapp/databases/wa.db"), null);
        List<WContact> contactList = new LinkedList<>();
        String selectQuery = "SELECT  jid, display_name FROM wa_contacts where phone_type is not null and is_whatsapp_user = 1";
        Cursor cursor = db.rawQuery(selectQuery, null);
        if (cursor.moveToFirst()) {
          do {
            WContact contact = new WContact(cursor.getString(1), cursor.getString(0));
            contactList.add(contact);
          } while (cursor.moveToNext());
        }
        db.close();
        return contactList;
      }
      @Override
      protected void onPostExecute(List<WContact> contacts) {
        super.onPostExecute(contacts);
        if (listener != null) {
          listener.receiveWhatsappContacts(contacts);
        }
      }
    }.execute();
  } else
    throw new WhatsappNotInstalledException();
}

public synchronized void sendMessage(final List<WContact> contacts, final WMessage message, final Context context, final SendMessageListener listener) throws IOException, WhatsappNotInstalledException {
  if (isWhatsappInstalled()) {
    new AsyncTask<Void, Void, Boolean>() {
      @Override

mReceivers = new LinkedList<>();
if (!WhatsappApi.getInstance().isWhatsappInstalled()) {
  Toast.makeText(this, "Whatsapp not installed", Toast.LENGTH_SHORT).show();
  return;