Question

我在Fragment类中的Adapter类如下：

更新

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-controller="myController">
  <input type="checkbox" ng-model="isTrue" > <tt>isTrue</tt>
  <p>Main solution</p>
  <p ng-class="{ true: 'bg-green', false: 'bg-red' }[!!isTrue]">{ true: 'bg-green', false: 'bg-red' }[!!isTrue]</p>
  <p>Alternative solutions</p>
  <p ng-class="isTrue ? 'bg-green' : 'bg-red'">isTrue ? 'bg-green' : 'bg-red'</p>
  <p ng-class="{ 'bg-green': isTrue, 'bg-red': !isTrue }" >{ 'bg-green': isTrue, 'bg-red': !isTrue }</p>
</div>

Item.java

public class FeedBackFragment extends Fragment {

ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();


MyAdapter adapter;
ArrayList<Item> manufacturersList = new ArrayList<>();
JSONArray manufacturers = null;

// manufacturers JSON url
private static final String URL_MANUFACTURERS = "URL";

public FeedBackFragment() {
    // Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.feedback_gridview_manufacturer, container, false);

    GridView gridView = (GridView) view.findViewById(R.id.gridview);
    // gridView.setAdapter(new MyAdapter(getActivity(), manufacturersList));

    adapter = new MyAdapter(getActivity(), manufacturersList);
    gridView.setAdapter(adapter);


    gridView.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> arg0, View view, int arg2, long arg3) {
            // on selecting a single manufacturer
            // CategoryCarActivity will be launched to show category car inside the manufacturer
            Intent i = new Intent(getActivity(), CategoryCarActivity.class);

            // send manufacturer id to activity to get list of cars under that manufacturer
            String manufacturer_id = ((TextView) view.findViewById(R.id.manufacturer_id)).getText().toString();
            i.putExtra("manufacturer_id", manufacturer_id);

            startActivity(i);
        }
    });

    return view;
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onActivityCreated(savedInstanceState);

    // manufacturersList = new ArrayList<>();
    new LoadAllManufacturers().execute();
}


class LoadAllManufacturers extends AsyncTask<String, String, String> {
    /**
     * Before starting background thread Show Progress Dialog
     * */
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(getActivity());
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(false);
        pDialog.show();
    }

    /**
     * After completing background task Dismiss the progress dialog
     * **/
    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);

        adapter.notifyDataSetChanged();
        // dismiss the dialog after getting all manufacturers
        if (pDialog.isShowing())
            pDialog.dismiss();
    }
}

private class MyAdapter extends BaseAdapter
{
    private LayoutInflater inflater;

    public MyAdapter(Context context, ArrayList<Item> arrayList)
    {
        this.manufacturersList = arrayList;
        inflater = LayoutInflater.from(context);
    }

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

    @Override
    public Object getItem(int i)
    {
        return manufacturersList.get(i);
    }

    @Override
    public long getItemId(int i)
    {
        return manufacturersList.get(i).drawableId;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup)
    {
        View v = view;
        ImageView picture;
        TextView name;

        if(v == null)
        {
            v = inflater.inflate(R.layout.gridview_item, viewGroup, false);
            v.setTag(R.id.picture, v.findViewById(R.id.picture));
            v.setTag(R.id.text, v.findViewById(R.id.text));
        }

        picture = (ImageView)v.getTag(R.id.picture);
        name = (TextView)v.getTag(R.id.text);

        picture.setImageResource(item.drawableId);
        name.setText(item.name);

        return v;
    }
  }
}

}

我的gridview_item.xml：

public class Item
{
    final String name;
    final int drawableId;
Item(String name, int drawableId)
{
    this.name = name;
    this.drawableId = drawableId;
}

我无法在POJO类中填充Adapter类中的数据？我不知道如何将ArrayList manufacturerList改为POJO，我需要大家的帮助。我已经搜索并尝试了很多方法但是没有成功

已更新，导致错误行：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

<com.totoroads.android.app.SquareImageView
    android:id="@+id/picture"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:scaleType="centerCrop"
    />
<TextView
    android:id="@+id/text"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingLeft="10dp"
    android:paddingRight="10dp"
    android:paddingTop="15dp"
    android:paddingBottom="15dp"
    android:layout_gravity="bottom"
    android:textColor="@android:color/white"
    android:background="#55000000"
    />

Answer 1

您应该更改Adapter的构造函数并接收Item对象的List而不是HashMap。

ArrayList manufacturersList;

private LayoutInflater inflater;

public MyAdapter(Context context, ArrayList<Item> arrayList)
{
    this.manufacturersList = arrayList;
    inflater = LayoutInflater.from(context);
}

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

@Override
public Object getItem(int i)
{
    return manufacturersList.get(i);
}

@Override
public long getItemId(int i)
{
    return manufacturersList.get(i).drawableId;
}

将您的Item类设为全局，以便Activity也可以访问它。

在AsyncTast中，而不是将数据添加到HashMap，将其添加到ArrayList

ArrayList<Item> manufacturersList = new ArrayList<>(); // declare outside your AsyncTask


//Inside AsyncTask loop

Item item = new Item(name,id);  // I hope id is your drawableID
manufacturersList.add(item );

无法将数据从适配器填充到Fragment中的GridView

1 个答案: