Facebook share button for Android not enabled, stays faded -

i trying add facebook share in android. have added button in xml this

<com.facebook.share.widget.sharebutton             android:id="@+id/ivshare"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_gravity="center_horizontal"             android:layout_margintop="5dp" /> 

in java have tried implement this

@onclick(r.id.ivshare) public void onshareclick() {      sharelinkcontent linkcontent = new sharelinkcontent.builder()             .setcontenttitle("hello there")             .setcontentdescription(                     "the 'hello facebook' sample  showcases simple facebook integration")             .setcontenturl(uri.parse("market://details?id=" + getpackagename()))             .build();      sharebutton.setsharecontent(linkcontent);     sharebutton.registercallback(callbackmanager, new facebookcallback<sharer.result>() {         @override         public void onsuccess(sharer.result result) {             timber.d("share result %s", result);         }          @override         public void oncancel() {          }          @override         public void onerror(facebookexception error) {             error.printstacktrace();         }     }); } 

but thing faded, unclickable share button. have made app on developers.facebook.com, added release key hash , made app live there.