CREATE SIMPLE ANDROID APPLICATION

                                                          Open your eclipse

1.File
---->NewProject
------------>Choose Android Application Project
------------------------>Type Your Project Name
----------------------------------->Click Next
------------------------------------------>Click Next
------------------------------------------------>Finish

Now project show like this........ 

                                                                                                                                                                                   



                                                   How to Drag And Drop Button into Display

2.Layout
--------------->Palette
------------------>Button 
---------------------->Drop on Display
Outline Shows Button link

---------------->Button
-------------------->Right Click Propertise
-------------------------->Onclick type Function Name

 See the Following Image




                                                  3.Click mail.xml options .It will Show like this




                                                                  4.Now go to Src file
--------------------------->Java file
--------------------------------->Create a Function as Button Onclick funcction name
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {
    Button but;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        but=(Button)findViewById(R.id.button1);
       
    }

    public void callme(View v)
    {
        but.setText("helloButton");
    }
}





                                                5.Now you are ready to run you project

----------------->Right click the Project
------------------------>Configure
------------------------------>Android
----------------------------------->Target
----------------------------------------->Click Avd
----------------------------------------------->Apply
---------------------------------------------------->Run




                                                 6.Wait Few Seconds Auto open Emulator

----------------------------->Unlock
-------------------------------->Running Your Apps



                                                                       7.Click Button




That it ......