//global variable

HandlerThread thd1; //desk

Handler h1; //worker

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//init env

thd1 = new HandlerThread("Thread_ftp");

thd1.start();

h1 = new Handler(thd1.getLooper());

}

private Runnable rab1 = new Runnable() { //wi : work instruction 

@Override

public void run() {

...

...

...

}

};

public void btn_1(View v) {

//worker get work

h1.post(rab1);

}