我想在一个片段中得到一个FloatingButton
。为什么我的应用程序因为ImageView而崩溃?
XML:
<?xml version="1.0" encoding="utf-8"?>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Demand"
android:id="@+id/frag_demand"
android:layout_gravity="center_horizontal|top"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<ImageView
android:layout_width="65dp"
android:layout_height="65dp"
android:id="@+id/imageButton"
android:background="@drawable/oval"
android:elevation="10dp"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
android:layout_marginBottom="20dp"
android:layout_marginRight="15dp"
android:src="@drawable/ic_menu_add"/>
JAVA:
public class DemandFragment extends Fragment {
MenuItem fav;
ImageButton floatButton;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_demand, container, false);
floatButton = (ImageButton) rootView.findViewById(R.id.imageButton);
floatButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Snackbar.make(v, "Replace with your own action", Snackbar.LENGTH_LONG);
}
});
return rootView;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
}
logcat中给出了:
java.lang.ClassCastException:android.widget.ImageView不能转换到android.widget.ImageButton
这是为什么不工作?
消息非常明确:'android.widget.ImageView不能转换为android.widget.ImageButton' –