How to get the screen size of a mobile phone in Android

1. Public
   
   
    
   Class
   
   
   Testactivity extends activity {
   
3. 
   Private
   
   
   Textview TV;
4. 
   Private
   
   
   Button BTN;
6. 
   // Get the mobile phone number
   Screen Resolution class
   
   
7. 
   Private
   
   
   Displaymetrics DM;
9. 
   Public
   
   
    
   Void
   
   
   Oncreate (bundle savedinstancestate ){
10. Super. oncreate (savedinstancestate );
11. SetContentView (R. layout. main );
13. TV = (TextView) findViewById (R. id. TV );
14. Btn = (Button) findViewById (R. id. btnOK );
15. Btn. setOnClickListener (
    New
    
    
    View. OnClickListener (){
17. 
    Public
    
    
     
    Void
    
    
    OnClick (View v ){
18. Dm =
    New
    
    
    Displaymetrics ();
19. Getwindowmanager (). getdefaultdisplay (). getmetrics (DM );
20. 
    // Obtain the mobile phone number
    In pixels.
    
    
21. String strpm =
    "Mobile Phone
    Screen Resolution :"
    
    + DM. widthpixels +
    "*"
    
    + DM. heightpixels;
22. TV. settext (strpm );
23. }
24. });
25. }
27. }