Gridview in Fragmente nicht funktioniert

Question

getItem hier nicht genannt würde mein Code seiner nicht funktioniert, wenn ich Verwendung Tätigkeit bin dann richtig seine Arbeit aber in Fragmente getItem Methode nicht gonna call bitte

helfen, dies mein Fragment ist:

public class HomeFragment extends BaseFragment{ 

    private static final String TAG = "HomeFragment"; 
    private GridView gvMainItems; 
    private HomeFragmentGridAdapter homeFragmentGridAdapter; 
    private ArrayList<HashMap<String, String>> arrayList; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 

     View view=inflater.inflate(R.layout.fragment_home,container,false); 
     gvMainItems = (GridView) view.findViewById(R.id.gvMainItems); 

     arrayList = new ArrayList<>(); 
     for(int i = 1; i < 100; i++){ 
      HashMap<String, String> map = new HashMap<>(); 
      map.put("item", String.valueOf(i)); 
      arrayList.add(map); 
     } 

     homeFragmentGridAdapter = new HomeFragmentGridAdapter(getActivity(), arrayList); 
     gvMainItems.setAdapter(homeFragmentGridAdapter); 

     return view; 
    } 
    @Override 
    public void onClick(View view) { 

    } 
} 

Das ist mein Adapter:

public class HomeFragmentGridAdapter extends BaseAdapter { 
    private final Context context; 
    private final ArrayList<HashMap<String, String>> arrayList; 
    private ViewHolder holder; 

    public HomeFragmentGridAdapter(Context context, ArrayList<HashMap<String,String>> arrayList){ 
     this.context = context; 
     this.arrayList = arrayList; 
    } 

    @Override 
    public int getCount() { 
     return arrayList.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return arrayList.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View cinvertview, ViewGroup viewGroup) { 

     if(cinvertview == null) { 
      holder = new ViewHolder(); 
      LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      cinvertview = inflater.inflate(R.layout.fragment_home_grid_raw, null, true); 
      holder.textView = (TextView) cinvertview.findViewById(R.id.textView); 
      cinvertview.setTag(holder); 
     }else{ 
      holder = (ViewHolder) cinvertview.getTag(); 
     } 
     Log.d(TAG, "getItem: "+arrayList.get(position).get("item")); 

     holder.textView.setText(arrayList.get(position).get("item")); 
     return cinvertview; 
    } 
    public class ViewHolder{ 

     public ImageView ivGridItem; 
     public TextView textView; 
    } 
} 

diese xml ist

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
android:id="@+id/content_main" 
xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="vertical" 
app:layout_behavior="@string/appbar_scrolling_view_behavior" 
tools:context="com.neodocto.activity.MainActivity" 
tools:showIn="@layout/app_bar_main"> 



<GridView android:id="@+id/gvMainItems" 
xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:columnWidth="90dp" 
android:gravity="center" 
android:horizontalSpacing="10dp" 
android:numColumns="auto_fit" 
android:stretchMode="columnWidth" 
android:verticalSpacing="10dp" 
/> 
</LinearLayout> 

Answer 1

ich meine Gridview dies ändern und es funktioniert

<GridView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/gvMainItems" 
     android:layout_alignParentTop="true" 
     android:layout_alignParentLeft="true" 
     android:numColumns="4" /> 

Answer 2

Ändern Sie diesen Code in Ihre HomeFragment:

homeFragmentGridAdapter = new HomeFragmentGridAdapter(getActivity().getApplicationContext(), arrayList); 

Weil Ihr Konstrukt verwendet einen Kontext statt eines FragmentActivity (von der getActivity() zurückgegeben.

Answer 3

Bitte versuchen Sie es auf diese Weise arbeite ich haben feine ändern auf Ihrem Adapter wie

private final Context context; 
private final ArrayList<HashMap<String, String>> arrayList; 
private ViewHolder holder; 
LayoutInflater inflater; 

public HomeFragmentGridAdapter(Context context, ArrayList<HashMap<String, String>> arrayList) { 
    this.context = context; 
    this.arrayList = arrayList; 
    inflater = LayoutInflater.from(this.context); 
} 

@Override 
public int getCount() { 
    return arrayList.size(); 
} 

@Override 
public Object getItem(int position) { 
    return position; 
} 

@Override 
public long getItemId(int position) { 
    return position; 
} 

@Override 
public View getView(int position, View cinvertview, ViewGroup viewGroup) { 

    if (cinvertview == null) { 
     holder = new ViewHolder(); 
     cinvertview = inflater.inflate(R.layout.list_purchase_items, null); 

     holder.textView = (TextView) cinvertview.findViewById(R.id.textView); 
     cinvertview.setTag(holder); 
    } else { 
     holder = (ViewHolder) cinvertview.getTag(); 
    } 
    Log.d(TAG, "getItem: " + arrayList.get(position).get("item")); 

    holder.textView.setText(arrayList.get(position).get("item")); 
    return cinvertview; 
} 

public class ViewHolder { 

    public ImageView ivGridItem; 
    public TextView textView; 
}