如何将自定义布局添加到 Arrayadapter？

Question

我正在尝试创建具有自定义布局的ListView。 listView 中的每个项目应如下面的item.xml 所示。

在代码中，我使用了

adapter = new ArrayAdapter<T>(getApplicationContext(), R.layout.listi_tems_layout, topicsList);

但它不起作用，因为ArrayAdapter<T> 的构造函数接受第二个参数为int 类似

android.R.layout.simple_list_item_1

，在我的例子中，它是自定义布局，即

R.layout.listi_tems_layout

我应该使用哪个适配器或如何解决这个问题。谢谢

物品：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="3">

<TextView 
    android:id="@+id/tvlist_topic"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_weight="1"/>
<ImageView 
    android:id="@+id/ivList_delete"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:clickable="true"
    android:src="@drawable/delete_icon"
    android:contentDescription="icon to delete item from the Listview"
    android:layout_weight="1"/>
<CheckBox 
    android:id="@+id/cbList_hook"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:checked="false"
    android:layout_weight="1"/>

主布局：

<RelativeLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="${relativePackage}.${activityClass}" >
....
....
....

<ListView 
    android:id="@+id/lvEco_topics"
    android:layout_width="match_parent"
    android:layout_height="470dp"
    android:layout_below="@id/tvEco_topic"
    android:layout_marginTop="30dp"
    android:scrollbars="vertical"
    android:divider="@android:drawable/alert_light_frame"></ListView>
<Button 
    android:id="@+id/btEco_save"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@id/lvEco_topics"
    android:gravity="center"
    android:text="Save"/>

代码：

public class MainActivity extends Activity {

private ArrayList<String> topicsList;
private ListAdapter adapter;

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

    topicsList = new ArrayList<String>();
    topicsList.add("topic1");
    topicsList.add("topic2");
    topicsList.add("topic3");
    topicsList.add("topic4");
    topicsList.add("topic5");
    topicsList.add("topic6");

    adapter = new ArrayAdapter<T>(getApplicationContext(), R.layout.listi_tems_layout, topicsList);

Answer 1

我不确定它是否仍然相关， 从源 ArrayAdapter 似乎有在第三个参数中接受 textview 资源的构造函数，不确定它是否是 2017 年新添加的：D，

ArrayAdapter adapter = new ArrayAdapter<>(context,YourCustomLayoutID,TextViewIDinYourLayout,ListData);

从源头来看，如果您没有提供 textview 布局 id，它将假定整个视图是一个 textview，所以我认为可以在不扩展/创建新适配器的情况下使用自定义视图（我知道，我讨厌自己创建一个），但您需要提供用于文本的文本视图

Answer 2

创建一个类并像这样使用基本适配器进行扩展，然后设置此适配器

import java.util.ArrayList;

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

import com.example.test.R;
import com.itoks.model.ClientDetails;

public class ClientListAdapter extends BaseAdapter {
    // ArrayList<String> name, company, email, id, status;
    ArrayList<ClientDetails> clientArrayList;
    Context c;

    public ClientListAdapter(Context c, ArrayList<ClientDetails> list) {
        clientArrayList = list;
        this.c = c;

    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return clientArrayList.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return clientArrayList.get(position);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        View row = null;
        LayoutInflater inflater = (LayoutInflater) c
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if (convertView == null) {
            row = inflater.inflate(R.layout.listview_item_clients, parent,
                    false);
        } else {
            row = convertView;
        }
        ClientDetails detail = clientArrayList.get(position);
        TextView name = (TextView) row.findViewById(R.id.tvClientFullName);
        name.setText(detail.name);
        TextView email = (TextView) row.findViewById(R.id.tvClientEmail);
        email.setText(detail.email);
        TextView id = (TextView) row.findViewById(R.id.tvClientID);
        id.setText("ID : " + detail.id);
        TextView company = (TextView) row
                .findViewById(R.id.tvClientCompanyName);
        company.setText(detail.company);
        TextView status = (TextView) row.findViewById(R.id.tvClientStatus);
        status.setText("Status:" + detail.status);
        return row;
    }

}

Answer 3

请创建您自己的扩展 ArrayAdapter.

的 ItemAdapter

public class ItemAdapter extends ArrayAdapter<Item> {
private int resource;
private List<Item> items;

public ItemAdapter(Context context, int resource, List<Item> items) {
    super(context, resource, items);
    this.resource = resource;
    this.items = items;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    LinearLayout itemView;
    final Item item = getItem(position);

    if (convertView == null) {
        itemView = new LinearLayout(getContext());

        LayoutInflater layoutInflater = LayoutInflater.from(getContext());
        layoutInflater.inflate(resource, itemView, true);
    }
    else {
        itemView = (LinearLayout) convertView;
    }

然后在 MainActivity onCreate() 中加载你的 item.xml

public class MainActivity{
    private List<Item> items;
    private ItemAdapter itemAdapter;
    @Override
      protected void onCreate(Bundle savedInstanceState) {
      itemAdapter = new ItemAdapter(this, R.layout.item, items);

Answer 4

据我了解。您正在尝试在 ArrayAdapter 中进行自定义布局。这是不可能的。您需要编写自己的自定义适配器扩展 arrayAdapter 类，您可以在其中定义如何使用您的主题列表处理自定义布局。像这样的：

public class ChatUserAdapter extends ArrayAdapter<UserChat> {

private Activity context;
private List<UserChat> userList;
private int ilayout;

public ChatUserAdapter(Activity context, int layout, List<UserChat> userList) {
    super(context, layout, userList);
    this.context = context;
    this.userList = userList;
    this.ilayout = layout;
}

public long getItemId(int position) {
    return position;
}

static class ViewHolder {
    public TextView tvEmail;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder viewHolder;
    View rowView = convertView;
    if (rowView == null) {

        LayoutInflater layoutInflater = context.getLayoutInflater();
        rowView = layoutInflater.inflate(ilayout, null, true);
        viewHolder = new ViewHolder();
        viewHolder.tvEmail = (TextView) rowView.findViewById(R.id.tv_email);
        rowView.setTag(viewHolder);
    } else {
        viewHolder = (ViewHolder) rowView.getTag();
    }

    UserChat item = userList.get(position);
    viewHolder.tvEmail.setText(item.getName() + " " + item.getSurname());
    return rowView;
}
}

Answer 5

ArrayAdapter 接受第二个参数为 int 之类的 android.R.layout.simple_list_item_1

当不自定义ArrayAdapter 的getView 方法时，自定义布局需要一个带有android:id="@android:id/text1" id 的TextView 并在一个TextView 中显示值。

要使用当前代码运行应用程序，请在 R.layout.listi_tems_layout 布局中为 TextView 添加 android:id="@android:id/text1"。

因为R.layout.listi_tems_layout 布局还包含其他带有 TextView 的视图，所以通过扩展 ArrayAdapter 类来创建自定义适配器也可以访问其他视图。

参见以下示例：Custom ArrayAdapter for a ListView (Android)