android - How to prevent others from removing my admob Ads? -

i've published application google appmarket.

and using admob gain profit. find downloaded app , removed ads, , published other market, not want @ all.

here code put in layout.xml

<com.admob.android.ads.adview     android:id="@+id/admob_view"     android:visibility="visible"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     app:backgroundcolor="#000000"     app:primarytextcolor="#ffffff"     app:secondarytextcolor="#cccccc"     app:keywords=""/> 

can guys give me advises on how prevents happening. appreciated, thanks

to make harder add view in java instead of xml , obfuscate code.