android - Adding button makes camera preview not display -

i have app has camera preview view. i've added button overlays framelayout camera preview inside. before added button camera preview worked fine; however, after addition of button, camera preview not display.

here xml layout using:

    > </framelayout> <linearlayout     android:orientation="horizontal"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:layout_gravity="center_horizontal|bottom"     > <button         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="freeze"         android:id="@+id/buttonfreeze"         android:background="@null"         android:clickable="true" /> </linearlayout> 

my onclick listener , corresponding methods:

public void onclick(view v) {     if(v == buttonfreeze) {         if(buttonfreeze.gettext().equals("freeze")) {             mirrorview.freezepreview();             buttonfreeze.settext("unfreeze");         } else {             mirrorview.unfreezepreview();             buttonfreeze.settext("freeze");         }     }  }  public void freezepreview() {     mcamera.stoppreview(); }  public void unfreezepreview() {     mcamera.startpreview(); } 

is addition of button causing this? or else?

replace

if(v == buttonfreeze) { 

with

if(v.getid() == r.id.buttonfreeze) {