java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

Question

hi i have a problem with my code..my code is

progressD = ProgressDialog.show(MenuUtama.this, "", "Uploading files to server.....", false);
Thread thread = new Thread(new Runnable(){
       public void run(){
           //doFileUpload();
           try {
            // setiap parameter yang akan dikirim melalui http
            // harus encode agar
            // dapat terbaca dengan baik oleh server
            Cursor c = helper.getAll1(almagId);
            Cursor cr = helper.getUpImage(almagId);
                if(c.moveToFirst()){
                    //progressD = ProgressDialog.show(context, title, message)
                        do{
                            String kdstore = URLEncoder.encode(helper.getKdStore(c).toString(), "utf-8");
                            String nama = URLEncoder.encode(helper.getNama(c).toString(), "utf-8");
                            String alamat = URLEncoder.encode(helper.getAlamat(c).toString(), "utf-8");
                            String kdpos = URLEncoder.encode(helper.getKdPos(c).toString(), "utf-8");
                            String notelp = URLEncoder.encode(helper.getNotel(c).toString(), "utf-8");
                            String lng = URLEncoder.encode(helper.getlng(c).toString(), "utf-8");
                            String lat = URLEncoder.encode(helper.getLat(c).toString(), "utf-8");
                            String perush = URLEncoder.encode(helper.getPerus(c).toString(), "utf-8");
                            //String gambar = URLEncoder.encode(helper.getGamb(c).toString(), "utf-8");

                            //Toast.makeText(this, kdstore, Toast.LENGTH_LONG).show();
                            //System.out.println(gambar);
                            url += "?kode_toko=" + kdstore + "&&nama=" + nama + "&&alamat=" + alamat + 
                            "&&kode_pos=" + kdpos + "&&no_telp=" + notelp + "&&longitude=" + lng + "&&latitude=" + lat +
                            "&&perusahaan=" + perush;
                            getRequest(url);
                            url = "http://10.234.165.232/upload_get.php";
                        }while(c.moveToNext());
            }
            if(cr.moveToFirst()){
                do{
                    String kdstore = URLEncoder.encode(helper.getKdstore1(cr), "utf-8");
                    String gambar = URLEncoder.encode(helper.getGam1(cr), "utf-8");
                    url1 += "?kode_toko1=" + kdstore + "&&gambar1=" + gambar;
                    getRequest1(url1);
                    url1 = "http://10.234.165.232/upload_get2.php";
                }while(cr.moveToNext());
            }

            } catch (UnsupportedEncodingException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
           MenuUtama.this.runOnUiThread(new Runnable(){
               public void run() {
                   if(progressD.isShowing())
                       progressD.dismiss();
               }
           });
       }
});
thread.start();
return(true);

and error like this :

FATAL EXCEPTION: Thread-9
java.lang.RuntimeException: 
Can't create handler inside thread that has not called Looper.prepare()
    at android.os.Handler.<init>(Handler.java:121)
    at android.widget.Toast.<init>(Toast.java:68)
    at android.widget.Toast.makeText(Toast.java:231)
    at com.sat.alfaloc.MenuUtama.getRequest(MenuUtama.java:160)
    at com.sat.alfaloc.MenuUtama$1.run(MenuUtama.java:101)
    at java.lang.Thread.run(Thread.java:1096)

if activity save data in to server I command the progress bar can run,but if not this not worked..what should i do to fix this problem??

Answer 1

Probably you are getting error because of the thread in which you are using the context of the activity.

You should use the AsyncTask instead of a normal thread. In AsyncTask there is a method onPreExecute() and onPostExecute() which are executing on the main thread and there is a method doInBackground() which will execute on background so that you can easily implement the long live process.

You can refer this example

Answer 2

Sometimes you might encounter this problem even when the offending code is inside the Activity (as in my case when using Unity game engine).

The following code has worked for me.

        this.runOnUiThread(new Runnable() {
           public void run() {
              //Your code here
              ...
           }
        });