Set TextView value inside a thread in android

Question

I am getting a crash under the fllowing circumstances. I am running a thread in the following way:

Thread t = new Thread(){
    public void run() {    
            text.setText("hello");    
    }
};
t.start;

The crash occurs if I try to set the value of a TextView in my xml, (the reference to text is already available).

Am I doing something fundamentally wrong? Kindly point out where am going wrong.

Answer 1

You can only access user interface components from the UI thread.

Android has a few things to make this easy, such as the method runOnUiThread and the class AsyncTask .

For more reading see Painless Threading and Processes and Threads in the Android documentation.

Answer 2

You should access android ui toolkit widgets only on the UI thread. Read http://developer.android.com/resources/articles/painless-threading.html .

Answer 3

use Handler class and check it for more relevant methods

Handler mHandler;
 mHandler=new Handler(){
hdandleMessage(Message what){

text.setText("hello");

}

};
Thread t = new Thread(){
    public void run()
    {

           mHandler.sendEmptyMessage(int what)

        }
};
t.start;