gridview中的onItemClicklistener不起作用

Question

我制作了一个标签，其中我使用了gridview来显示图像，textviews ...我想让听众...当用户点击gridview中的照片时...它转移到下一个活动，即image_description活动。

这是活动代码。

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class HomeFragment extends Fragment implements AdapterView.OnItemClickListener {

    public HomeFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_home, container, false);
       View vew= inflater.inflate(R.layout.activity_art_dic,container,false);
        final GridView gridview = (GridView)view.findViewById(R.id.gridview);
        gridview.setOnItemClickListener(this);
        gridview.setDrawSelectorOnTop(true);

        List<ItemObject> allItems = getAllItemObject();
        CustomAdapter customAdapter = new CustomAdapter(getActivity(), allItems);
        gridview.setAdapter(customAdapter);


        gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                Toast.makeText(getActivity(), "Position: " + position, Toast.LENGTH_SHORT).show();

            }
        });
        return view;
    }

    private List<ItemObject> getAllItemObject(){
        List<ItemObject> items = new ArrayList<>();
        items.add(new ItemObject(R.drawable.painting,"Dip It Low", "Christina Milian"));
        items.add(new ItemObject(R.drawable.paintingo,"Someone like you", "Adele Adkins"));
        items.add(new ItemObject(R.drawable.drawing,"Ride", "Ciara"));
        items.add(new ItemObject(R.drawable.sketchbook,"Paparazzi", "Lady Gaga"));
        items.add(new ItemObject(R.drawable.drawing,"Forever", "Chris Brown"));
        items.add(new ItemObject(R.drawable.paintingo,"Stay", "Rihanna"));
        items.add(new ItemObject(R.drawable.sketchbook,"Marry me", "Jason Derulo"));
        items.add(new ItemObject(R.drawable.painting,"Waka Waka", "Shakira"));
        items.add(new ItemObject(R.drawable.drawing,"Dark Horse", "Katy Perry"));
        items.add(new ItemObject(R.drawable.paintingo,"Dip It Low", "Christina Milian"));
        items.add(new ItemObject(R.drawable.painting,"Dip It Low", "Christina Milian"));
        items.add(new ItemObject(R.drawable.sketchbook,"Dip It Low", "Christina Milian"));
        return items;
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
     ItemObject image= (ItemObject) parent.getItemAtPosition(position);
        Intent intent=new Intent(getActivity(),photo_description.class);
        startActivity(intent);

    }
}

以下是它的样子

Answer 1

这是因为你设置了多个itemClickListeners。 从onCreateView中删除以下代码。

 gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                Toast.makeText(getActivity(), "Position: " + position, Toast.LENGTH_SHORT).show();

            }
        });

Answer 2

  

onItemClicklistner无效

因为为同一个GridView设置了onItemClicklistner两次，所以onItemClicklistner的最后一次调用将起作用并在点击GridView项目时显示Toast消息。

要点击项目移至下一个活动，请移除setOnItemClickListener方法

的第二次调用

Answer 3

从您的代码中移除此部分。

gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

    Toast.makeText(getActivity(), "Position: " + position, Toast.LENGTH_SHORT).show();

      }
 });

  

因为这是你已经定义的并且已经两次。

gridview.setOnItemClickListener(this);

  

然后添加onClickListener方法并执行您想要的操作。

@Override
public void onClick(View v) {
 //do what you want to do when button is clicked
    switch (v.getId()) {
        case R.id.gridview:
            // Switch Activity here
            break;
        case default:
            break; 
    }
}