Android Hide and Show buttons from a condition

Your button is in the XML layout, so you can hide it or show it by just changing its visibility

NB: You only need do these operations once:

1. Get a reference to your button, with findViewById()
2. Set the OnClickListener of the button

    

   <Button
   android:id="@+id/admin_new_questions"        
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="See Asked Questions"
   
   android:visibility="invisible" //Initially hide the button
   
   />

   Activity code:

   Button admin_see_questions = (Button)findViewById(R.id.admin_new_questions);   
   admin_see_questions.setOnClickListener(new Button.OnClickListener() 
   {  
       public void onClick(View v) 
       {
           ....       
       }
   });  
   
   if ( clause )
   {
       admin_see_questions.setVisibility(View.VISIBLE); //SHOW the button
   }

   Or Chec this one:

   if(Cars.payment) {
       btnDone.setVisibility(View.GONE);
       btnPaid.setVisibility(View.VISIBLE);
    } else {
       btnPaid.setVisibility(View.GONE);
       btnDone.setVisibility(View.VISIBLE);
    }