CODEWITHSUNDEEP
javaandroideclipseandroid-layoutlistview
marko kurt
marko kurt

Reputation: 205

ClassCastException in android application

I have a little problem. I want to create navigation drawer with titles, but eclipse throws me a class cast exception. The problem is in adapter, but I can't find it. Can you please help me. Here is code for my adapter

public class NavDrawerAdapter extends ArrayAdapter<NavDrawerItem>{

private LayoutInflater inflater;

public NavDrawerAdapter(Context context, int textViewResourceId, NavDrawerItem[] objects ) {
    super(context, textViewResourceId, objects);
    this.inflater = LayoutInflater.from(context);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View view = null ;
    NavDrawerItem menuItem = this.getItem(position);
    if ( menuItem.getType() == NavMenuItem.ITEM_TYPE ) {
        view = getItemView(convertView, parent, menuItem );
    }
    else {
        view = getSectionView(convertView, parent, menuItem);
    }
    return view ;
}

public View getItemView( View convertView, ViewGroup parentView, NavDrawerItem navDrawerItem ) {

    NavMenuItem menuItem = (NavMenuItem) navDrawerItem ;
    NavMenuItemHolder navMenuItemHolder = null;

    if (convertView == null) {
        convertView = inflater.inflate( R.layout.navdrawer_item, parentView, false);
        TextView labelView = (TextView) convertView
                .findViewById( R.id.navmenuitem_label );
        ImageView i = (ImageView) convertView.findViewById(R.id.navmenuitem_icon);

        navMenuItemHolder = new NavMenuItemHolder();
        navMenuItemHolder.labelView = labelView ;
        navMenuItemHolder.image = i;

        convertView.setTag(navMenuItemHolder);
    }

    if ( navMenuItemHolder == null ) {
        navMenuItemHolder = (NavMenuItemHolder) convertView.getTag();
    }

    navMenuItemHolder.labelView.setText(menuItem.getLabel().toString());

    return convertView ;
}

public View getSectionView(View convertView, ViewGroup parentView,
        NavDrawerItem navDrawerItem) {

    NavMenuSection menuSection = (NavMenuSection) navDrawerItem ;
    NavMenuSectionHolder navMenuItemHolder = null;

    if (convertView == null) {
        convertView = inflater.inflate( R.layout.navdrawer_section, parentView, false);
        TextView labelView = (TextView) convertView
                .findViewById( R.id.navmenusection_label );

        navMenuItemHolder = new NavMenuSectionHolder();
        navMenuItemHolder.labelView = labelView ;
        convertView.setTag(navMenuItemHolder);
    }

    if ( navMenuItemHolder == null ) {
        navMenuItemHolder = (NavMenuSectionHolder) convertView.getTag();
    }

    navMenuItemHolder.labelView.setText(menuSection.getLabel().toString());

    return convertView ;
}

private static class NavMenuItemHolder {
    private TextView labelView;
    private ImageView image;
}

private static class NavMenuSectionHolder {
    private TextView labelView;
}

}

and here is code for my main activity

public class MainActivity extends Activity{

private DrawerLayout drawerLayout;
private NavDrawerAdapter adapter;
private ListView mDrawerList;
private ImageView menu;
private RelativeLayout rightRL;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerList = (ListView) findViewById(R.id.left_drawer);
    menu = (ImageView) findViewById(R.id.imageView1);
    rightRL = (RelativeLayout) findViewById(R.id.whatYouWantInRightDrawerProfil);

    NavDrawerItem[] m = new NavDrawerItem[]{
            NavMenuSection.create(100, "Demos"),
            NavMenuItem.create(101, "kako si", false, this),
            NavMenuSection.create(200, "General"),
            NavMenuItem.create(202, "Rate this app", false, this)
    };
    adapter = new NavDrawerAdapter(this, R.layout.navdrawer_item, m);
    mDrawerList.setAdapter(adapter);


}

public void onRight(View view) {
    drawerLayout.openDrawer(rightRL);
}

}

This is my logcat from eclipse

FATAL EXCEPTION: main java.lang.ClassCastException: com.markoKurt.zeljko.NavDrawerAdapter$NavMenuSectionHolder cannot be cast to com.markoKurt.zeljko.NavDrawerAdapter$NavMenuItemHolder at com.markoKurt.zeljko.NavDrawerAdapter.getItemView(NavDrawerAdapter.java:52) at com.markoKurt.zeljko.NavDrawerAdapter.getView(NavDrawerAdapter.java:25) at android.widget.AbsListView.obtainView(AbsListView.java:2449) at android.widget.ListView.measureHeightOfChildren(ListView.java:1250) at android.widget.ListView.onMeasure(ListView.java:1162) at android.view.View.measure(View.java:15504) at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:617) at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:399) at android.view.View.measure(View.java:15504) at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:866) at android.view.View.measure(View.java:15504) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5059) at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) at android.view.View.measure(View.java:15504) at android.widget.LinearLayout.measureVertical(LinearLayout.java:833) at android.widget.LinearLayout.onMeasure(LinearLayout.java:574) at android.view.View.measure(View.java:15504) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5059) at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2385) at android.view.View.measure(View.java:15504) at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1979) at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1222) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1395) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1115) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4526) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725) at android.view.Choreographer.doCallbacks(Choreographer.java:555) at android.view.Choreographer.doFrame(Choreographer.java:525) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711) at android.os.Handler.handleCallback(Handler.java:615) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4921) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794) at dalvik.system.NativeStart.main(Native Method)

Please help me, and thanks in advance

Upvotes: 1

Views: 202

Answers (5)

marko kurt
marko kurt

Reputation: 205

I solved the problem. I just needed to add 

@Override
public int getViewTypeCount() {
    return 2;
}

@Override
public int getItemViewType(int position) {
    return this.getItem(position).getType();
}

@Override
public boolean isEnabled(int position) {
    return getItem(position).isEnabled();
}

Upvotes: 2

QArea
QArea

Reputation: 4981

In getItemView and getSectionView you can get different views, so you need to check class instance.

public View getSectionView(View convertView, ViewGroup parentView,
NavDrawerItem navDrawerItem) {

NavMenuSection menuSection;
if (navDrawerItem !=null)
if (navDrawerItem instanceof NavMenuSection){
menuSection = navDrawerItem}
else {
menuSection = new NavMenuSection()
}else {
menuSection = new NavMenuSection()
}
public View getItemView( View convertView, ViewGroup parentView, NavDrawerItem navDrawerItem ) {

NavMenuItem menuItem = (NavMenuItem) navDrawerItem ;
    NavMenuItemHolder navMenuItemHolder = null;
NavMenuSection menuSection;
if (menuItem!=null)
if (menuItem instanceof  NavMenuItem){
menuItem =  NavMenuItem
else {
menuItem = new  NavMenuItem()
}else {
menuItem= new  NavMenuItem()
}

Upvotes: 0

Krish
Krish

Reputation: 3885

Try to change the logic for different layout like this, http://www.survivingwithandroid.com/2014/08/android-listview-with-multiple-row.html

Upvotes: 1

Blackbelt
Blackbelt

Reputation: 157437

your issue is related to the fact that you get only one null convertView, so the tag content is set just once for NavMenuSectionHolder or NavMenuItemHolder. Usually, when you have to handle more than one convertView you can override getViewTypeCount and getItemViewType. In your case, the two holder classes differ just for ImageView. So I would suggest you to have just one holder class, (inflating one layout), and hiding the ImageView when you don't need it

Upvotes: 2

DjP
DjP

Reputation: 4577

you trying to cast navDrawerItem to navMenuItem 

NavMenuItem menuItem = (NavMenuItem) navDrawerItem;

change it with 

NavDrawerItem drawerItem = (NavDrawerItem ) navDrawerItem;

and do accordingly..

Upvotes: 1

Related Questions