Apps data between two class

[gsources75]

Hi, I know to load data from WebService o load other resource i need to creare a separate Thread. Ok i tryed and i't ok but all example show Thread inside the class but i'd like create a system of message between class, a second class load and parse data adn after sen data to firt class.

Sorry for mybad english, there is the code


package com.example;

import android.app.Activity;
import android.os.Bundle;

public class MainClass extends Activity {
    private UtilClass u_load;

	/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        u_load= new UtilClass();
        u_load.loadData("http://www.mysite.com/data.xml");
        
        
    }
}

package com.example;

public class UtilClass {
	public UtilClass() {
		// TODO Auto-generated constructor stub
	}
	
	void loadData(String path){
		
		
		Thread t = new Thread() {
            public void run() {
                mResults = doSomethingExpensive();
                mHandler.post(mUpdateResults);
            }
        };
        t.start();
	}

}

I would have the task of loading data is given to the second class and after send data to MainClass. I don't want create UtilClass as Activity

 

[JamTheMan]

Well... You've already got it almost all the way there. The easiest understandable way to do it, is to give your UtilClass a reference to the caller in either its constructor like this:

public UtilClass(MainClass main){
...
}

or in the method you call to do the heavy lifting like this:

public void loadData(MainClass main){
...
}

Then you can define some public method in the MainClass which your UtilClass can call (in my example by calling main.somePublicMethod() ) whenever it is done crunching data.

 

[JamTheMan]

More Androidy ways of doing it, and better for big applications with many callbacks and stuff, is using the build in classes Intent, Message and Handler

But you'll need to read up on stuff like that here Common tasks and how to do them in Android