所以，现在我有一个自定义适配器类，它接受一个 Locations 数组并将它们添加到 ListView。这一切都很好，但我想在初始化后将位置添加到此 ListView 。例如，某人可以“添加一个位置”，它会将其添加到此 ListView 中。这是我的主要 Activity :

package com.example.listviewtest;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;

public class MainActivity extends Activity {

private ListView listView1;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Location location_data[] = new Location[]
    {
        new Location(R.drawable.ic_launcher, "Location 1", "Fruit!", "2 miles", "8-4 mon-fri\nclosed sun"),
        new Location(R.drawable.ic_launcher, "Location 2", "Veggies!", "2 miles", "8-5"),
        new Location(R.drawable.ic_launcher, "Location 3", "Plants!", "2 miles", "8-5"),
        new Location(R.drawable.ic_launcher, "Location 4", "Flowers!", "2 miles", "8-5"),
        new Location(R.drawable.ic_launcher, "Location 5", "Baked Goods!", "2 miles", "8-5")
    };

   LocationAdapter adapter = new LocationAdapter(this, 
            R.layout.listview_item_row, location_data);

   //adapter.add(new Location(R.drawable.ic_launcher, "Location 6", "Veggies!", "2 miles", "8-5"));


    listView1 = (ListView)findViewById(R.id.listView1);

    View header = (View)getLayoutInflater().inflate(R.layout.listview_header_row, null);
    listView1.addHeaderView(header);

    listView1.setAdapter(adapter);
}
}

这行得通。我现在想做一些像 adapter.add(new Location(R.drawable.ic_launcher, "Location 6", "Veggies!", "2 miles", "8-5"));用数组填充它之后。

这是我的 LocationAdapter 类:

package com.example.listviewtest;

import android.app.Activity;
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;

public class LocationAdapter extends ArrayAdapter<Location>{

Context context; 
int layoutResourceId;    
Location data[] = null;

public LocationAdapter(Context context, int layoutResourceId, Location[] data) {
    super(context, layoutResourceId, data);
    this.layoutResourceId = layoutResourceId;
    this.context = context;
    this.data = data;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View row = convertView;
    LocationHolder holder = null;

    if(row == null)
    {
        LayoutInflater inflater = ((Activity)context).getLayoutInflater();
        row = inflater.inflate(layoutResourceId, parent, false);

        holder = new LocationHolder();
        holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
        holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle);
        holder.details = (TextView)row.findViewById(R.id.details);
        holder.distance = (TextView)row.findViewById(R.id.distance);
        holder.hours = (TextView)row.findViewById(R.id.hours);

        row.setTag(holder);
    }
    else
    {
        holder = (LocationHolder)row.getTag();
    }

    Location location = data[position];
    holder.txtTitle.setText(location.title);
    holder.imgIcon.setImageResource(location.icon);
    holder.details.setText(location.details);
    holder.distance.setText(location.distance);
    holder.hours.setText(location.hours);

    return row;
}

static class LocationHolder
{
    ImageView imgIcon;
    TextView txtTitle;
    TextView details;
    TextView distance;
    TextView hours;
}
}

关于如何实现这个的任何想法？谢谢。

最佳答案

1. 在你的适配器中改变Locations data[]从数组到 ArrayList<Location>并覆盖适当的构造函数
2. 在你的 Activity 中，让你的变量data一个字段(类型 ArrayList<Location> )
3. 添加位置时，您可以使用 data.add(location)
4. 然后您可以调用notifyDatasetChanged()在你的适配器上

Example code .

关于java - 使用适用于 Android 应用程序的自定义适配器将项目动态添加到 ListView ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23939800/