Question

活动代码：

package com.example.tayyab.myapplication;

import android.content.Intent;
import android.graphics.Typeface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MyProfile extends AppCompatActivity {

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

        populateListView();
    }

    private void populateListView() {

        String[] myItems = {"Missions","Messages","Camera","Gallery","Temprature","Humidity"};
        int[] img = {R.drawable.target,R.drawable.chat,R.drawable.camera,R.drawable.gallery,R.drawable.temp,R.drawable.humidity};
        //ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.list_item,myItems);
        //ArrayAdapter<Integer> ad = new ArrayAdapter<Integer>(this,R.layout.list_item,img);

        final ProfileAdapter adapter = new ProfileAdapter(getApplicationContext(),R.layout.list_item);
        int i=0;
        for(String Name : myItems){
            Profile obj = new Profile(Name,img[i]);
            adapter.add(obj);
            i++;
        }

        ListView list = (ListView) findViewById(R.id.listViewMain);
        list.setAdapter(adapter);
        list.setClickable(true);
        ImageButton b3 = (ImageButton)findViewById(R.id.imageButton);
        b3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent= new Intent(MyProfile.this,MainMission.class);
                startActivity(intent);
            }
        });

        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Log.i("Log ","Inside Click Listener");
                String myItems = (String) adapterView.getItemAtPosition(i);
                Toast.makeText(view.getContext(),myItems,Toast.LENGTH_SHORT).show();
                if(i==1) {
                    Log.i("Message Event", "Inside Message Activity");
                    Intent a = new Intent(MyProfile.this, MainMission.class);
                    startActivity(a);
                }
            }
        });
    }   
}

适配器类：

package com.example.tayyab.myapplication;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

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

public class ProfileAdapter extends ArrayAdapter {

    private List list = new ArrayList();

    public ProfileAdapter(Context context, int resource) {
        super(context, resource);
    }

    public void add(Profile object) {
        list.add(object);
        super.add(object);
    }

    static class ImageHolder {
        ImageView img;
        TextView txt;
    }

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row;
        row = convertView;
        ImageHolder holder;
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            row = inflater.inflate(R.layout.list_item, parent, false);
            holder = new ImageHolder();
            holder.img = (ImageView) row.findViewById(R.id.profile_images);
            holder.txt = (TextView) row.findViewById(R.id.profile_names);
            row.setTag(holder);
        }
        else {        
            holder = (ImageHolder) row.getTag();
        }

        Profile pr = (Profile) getItem(position);
        holder.img.setImageResource(pr.getImg_names());
        holder.txt.setText(pr.getItem_names());

        return row;
    }
}

Answer 1

也许你想让监听器监听ListView项目的点击。你在那里做的不是一个正确的方法。

您需要将onItemClickListener添加到ListView

listView.setOnItemClickListener(new OnItemClickListener()
{
    @Override 
    public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3)
    { 
        Toast.makeText(getContext(), "Item #" + position, Toast.LENGTH_SHORT).show();
    }
});

你有一个基本的监听器，可以告诉你你点击了什么项目。您可以在onItemClick方法中执行逻辑。

另外，如果您为ListView的行使用自定义布局，则需要添加

android:descendantFocusability="blocksDescendants"

在列表中的第一个父布局上。

另外，请考虑使用RecyclerView而不是ListView。

itemClickListener。如何点击listView中的项目？

1 个答案: