Android Activity Asynctask error

Question

I have an application with two activies. First one is reading serial data from arduino using asynctask. When button is clicked on first activity it should start second activity. But when I click that button it's going to android launcher everytime. Meanwhile second activity also opened in background.

I don't understand why android launcher is opening but not showing second activity on screen. Any suggestions? Thanks.

private class AdkReadTask extends AsyncTask<Void, String, Void> {

    public void pause() {

        degisken = false;
    }

    @Override
    protected Void doInBackground(Void... arg0) {

        while (degisken) {
            publishProgress(mAdkManager.readSerial());
            SystemClock.sleep(50);

        }
        return null;
    }

    protected void onProgressUpdate(String... progress) {
        kapak2 = (int) progress[0].charAt(2);
        kapak1 = (int) progress[0].charAt(1);
        limit = (int) progress[0].charAt(0);
        tx5.setText("kapak1 : " + (int) progress[0].charAt(1)
                + " kapak2 : " + (int) progress[0].charAt(2) + " limit : "
                + (int) progress[0].charAt(0));
    }

}
    public void butonClick(View v) {
                Intent intent = new Intent(UDOOBlinkLEDActivity.this,
                        shortcuts.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                intent.putExtra("dil", dil);
            startActivity(intent);
        }

Answer 1

Change this.

 Intent intent = new Intent(UDOOBlinkLEDActivity.this,
                    shortcuts.class);
 intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
 // startActivity(intent); remove this line
 intent.putExtra("dil", dil);
 startActivity(intent);

Because twice you are calling startActivity(intent); and after that you are sending data and again startActivity. So problem occurs.