[英]Can`t Pass a Model Class to my BaseAdapter
顯示的錯誤:
嘗試在空對象引用上調用虛擬方法'void android.widget.GridView.setAdapter(android.widget.ListAdapter)'。
gridView.setAdapter(adapter);
處的錯誤表面 但只能從API打印響應,然后將其傳遞給適配器以進行布局以處理顯示。
我建議將模型類轉換為數組列表,這實際上並非我所願。
嘗試過modelName.toArray()等。
謝謝您,我等待您的答復 。
我的模特班
public class MensWear {
private int id, user_id;
private String first_wear;
public MensWear(int id,int user_id,String first_wear) {
this.id = id;
this.user_id = user_id;
this.first_wear = first_wear;
}
public int getId() {
return id;
}
public int getUser_id() {
return user_id;
}
public String getFirst_wear() {
return first_wear;
}
}
我的基本適配器類
public class PhoneAdapter extends BaseAdapter {
private Context context;
private List<MensWear> mensWears;
public String imageUrlFromServer = "http:/10.0.2.2:5757/api/public/images/";
public PhoneAdapter(Context context, List<MensWear> mensWears) {
this.context = context;
this.mensWears = mensWears;
}
@Override
public int getCount() {
return mensWears.size();
}
@Override
public Object getItem(int i) {
return null;
}
@Override
public long getItemId(int i) {
return 0;
}
@Override
public View getView(int i,View view,ViewGroup viewGroup) {
final MensWear mensWear = mensWears.get(i);
if (view == null) {
final LayoutInflater layoutInflater = LayoutInflater.from(context);
view = layoutInflater.inflate(R.layout.phone_list, null);
}
//For text
TextView prdId = view.findViewById(R.id.mensWearIdForHompePage);
prdId.setText(prdId.toString());
//For images
final ImageView imageView = view.findViewById(R.id.phoneImages);
if(!TextUtils.isEmpty(mensWear.getFirst_wear())){
Picasso.with(context).load(imageUrlFromServer+mensWear.getFirst_wear())
.into(imageView);
}
return view;
}
}
我的班級延伸片段
public class Phones extends Fragment {
private GridView gridView;
private List<MensWear> mensWears;
private PhoneAdapter adapter;
public Phones() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_phones,container,false);
}
@Override
public void onViewCreated(@NonNull View view,@Nullable Bundle savedInstanceState) {
super.onViewCreated(view,savedInstanceState);
gridView = view.findViewById(R.id.gridHolder);
gridView = view.findViewById(R.id.gridHolder);
Call<MensWearResponse> wearResponseCall =
Service.getInstance().getApi().getAllMensWears();
wearResponseCall.enqueue(new Callback<MensWearResponse>() {
@Override
public void onResponse(Call<MensWearResponse> call,Response<MensWearResponse> response) {
mensWears = response.body().getMensWears();
for (MensWear mwr : mensWears){
Log.d("Name", mwr.getFirst_wear());
}
adapter = new PhoneAdapter(getActivity(), mensWears);
gridView.setAdapter(adapter);
}
@Override
public void onFailure(Call<MensWearResponse> call,Throwable t) {
}
});
}
}
我的布局文件網格布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
tools:context="com.nelbuc.nelbuc.goodWears"
>
<Grid
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:columnWidth="100dp"
android:numColumns="2"
android:verticalSpacing="24dp"
android:horizontalSpacing="10dp"
android:stretchMode="spacingWidthUniform"
android:id="@+id/gridHolder"
>
</Grid>
</RelativeLayout>
列表布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:id="@+id/phoneList"
android:layout_width="190dp"
android:background="#fff"
android:layout_height="180dp"
>
<TextView
android:id="@+id/mensWearIdForHompePage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="Apple"
android:textStyle="normal|italic"
android:textSize="25dp" />
<ImageView
android:id="@+id/phoneImages"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
/>
</RelativeLayout>
</RelativeLayout>
錯誤消息明確指出GridView為空。 您的布局中沒有GridView
,只有Grid
。 將Grid
更改為GridView
。
在您的布局中,您僅使用Grid
。 從Grid
更改為GridView
創建ArrayList
並將模型MensWear添加到該列表中,如下所示,然后將該列表傳遞到您的adpater
:
ArrayList<MensWear > arrayList_mens = new ArrayList<MensWear>();
for (MensWear mwr : mensWears)
{
Log.d("Name", mwr.getFirst_wear());
arrayList_mens.add(mwr);
}
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