Question

Consider i have one thread as a separate class , for example SimpleThread.java,

class SimpleThread extends Thread {

  public SimpleThread(String str) {
    super(str);
    }
    public void run() {
    for (int i = 0; i < 10; i++) {
        System.out.println(i + " " + getName());
            try {
        sleep((int)(Math.random() * 1000));
        } catch (InterruptedException e) {}
    }
    System.out.println("DONE! " + getName());
    }
}

from my android home.java i need to start the thread,

new SimpleThread("Jamaica").start();

once the loop end i need to shoe the alert,but when i use

 authalert = new AlertDialog.Builder(this);

it shows null pointer execption, i need a context over here in thread class , is there any other way to do this.

Answer 1

Hey you should use Handler for this
here is the code …

ProgressDialog _progressDialog = ProgressDialog.show(this,"Saving Data","Please wait......");
settintAdater();

 private void settingAdater(){

        Thread _thread = new Thread(){

            public void run() {

                Message _msg = new Message();
                _msg.what = 1; 
                 // Do your task where you want to rerieve data to set in adapet
                YourCalss.this._handle.sendMessage(_msg);
            };
        };
        _thread.start();
    }
 Handler _handle = new Handler(){

        public void handleMessage(Message msg) {

            switch(msg.what){

                case 1:
                    _progressDialog.dismiss();
                     listview.setAdapter();
            }
        }
 }