Android how to runOnUiThread in other class?

Question

In my application, in MainActivity, there is a thread which works fine. But when I call another class to get data from the server I can't run on a thread. See code example below.

class MainActivity extends Activity implements Runnable {      public void onCreate() {         new Thread(this).start();     }      public void run() {         //here is code for download data from server after completion this and in handler  i m call other class in setdata() method....     }      public void setData() {         new CheckData(this);     } }  class CheckData {     public CheckData(Context context) {         context.runUIonthread(){//cant call as runUIthread............     } } 

Answer 1

Here's a solution if you don't want to pass the context:

new Handler(Looper.getMainLooper()).post(new Runnable() {     public void run() {         // code goes here     } }); 

Answer 2

See the article Communicating with the UI Thread.

With Context in hand, you can create a Handler in any class. Otherwise, you can call Looper.getMainLooper(), either way, you get the Main UI thread.

For example:

class CheckData{     private final Handler handler;      public Checkdata(Context context){        handler = new Handler(context.getMainLooper());     }       public void someMethod() {        // Do work        runOnUiThread(new Runnable() {            @Override            public void run() {                // Code to run on UI thread            }        });     }      private void runOnUiThread(Runnable r) {        handler.post(r);     }   }