Question

I have a function that requires a lot of calculation, so I try to call that function inside a thread. This is how I do it:

  submit.setOnClickListener(new OnClickListener() {

        public void onClick(View view) {
            if(!(fromAdress.getText().toString().length() > 0) || !(toAdress.getText().toString().length() > 0)) {
                Toast.makeText(this, "ERROR IN INPUT", Toast.LENGTH_LONG).show();       
            }
            else {
                if(connected) {

                    final ProgressDialog dialog = ProgressDialog.show(this, "Calculating", 
                            "Please wait...", true);
                            final Handler handler = new Handler() {
                               public void handleMessage(Message msg) {
                                  dialog.dismiss();
                                  }
                               };
                            Thread checkUpdate = new Thread() {  
                               public void run() {

                                  measureDistanceAndTime(fromAdress.getText().toString(), toAdress.getText().toString());

                                  handler.sendEmptyMessage(0);
                                  }
                               };
                            checkUpdate.start();
                }

                else
                    Toast.makeText(this, "No network!", Toast.LENGTH_LONG).show(); 
            }

When I open the application, it shows the progressdialog, but after like 4 seconds, it stops responding. I cant figure out this problem, cuz when I remove the code for the thread and progressdialog, it works fine!

Isn’t this the way to do it?

Answer 1

The easiest way to do this is with an AsyncTask. Read this article entitled Painless Threading.