title: Get Id of Button in android
body: <p>I have a Button Adapter, i make 9 buttons in a gridview, then i set id for each button. BUt how do i use a button in another class, example: i need to change background of button with id 5. Here's my code </p>
  
  <pre><code>public class ButtonAdapter extends BaseAdapter {  
      static Button btn;  
      private Context mContext;  
  
      // Gets the context so it can be used later  
      public ButtonAdapter(Context c) {  
       mContext = c;  
  
      }  
  
  
  
      // Total number of things contained within the adapter  
      public int getCount() {  
       return somestringarray.length;  
      }  
  
       // Require for structure, not really used in my code.  
      public Object getItem(int position) {  
       return null;  
      }  
  
      // Require for structure, not really used in my code. Can  
      // be used to get the id of an item in the adapter for  
      // manual control.  
      public long getItemId(int position) {  
       return position;  
      }  
  
      public View getView(int position,  
                                View convertView, ViewGroup parent) {  
  
       if (convertView == null) {  
        // if it's not recycled, initialize some attributes  
        btn = new Button(mContext);  
        btn.setLayoutParams(new GridView.LayoutParams(85, 85));  
        btn.setPadding(8, 8, 8, 8);  
        btn.setOnClickListener(new MyOnClickListener(position)); 
        }  
       else {  
        btn = (Button) convertView;  
       }  
  
       btn.setText(somestringarray[position]);  
       // filenames is an array of strings  
       btn.setTextColor(Color.BLACK);  
       btn.setBackgroundResource(INTarraywithpictures[position]);  
  
       btn.setId(position);  //here i set Id
  
       return btn;  
      }  
     }  
  </code></pre>