Question

我有以下代码：

import android.app.ListActivity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
public class MainActivity extends ListActivity {

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

        String[][] from ={{"jonathan","guillaume","gerard"},{"fraise","patate","chocolat"}};

        ArrayAdapter<String[][]> adapter = new ArrayAdapter<String[][]>(getListView().getContext(),android.R.layout.simple_list_item_1, from);

        getListView().setAdapter(adapter);
    }
}

XML如下：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="zathstudio.projetliste.MainActivity">

<ListView
    android:id="@android:id/list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"></ListView>

我试图从＆＃34;中获取＃34;使用arrayAdapter在listView中显示的数组。如果数组是单维的，它可以工作，但我怎么能用2D数组呢？

Answer 1

您需要创建一个继承自ArrayAdapter类的自定义ArrayAdapter。我发现这对于你自己的类中的对象的ArrayList而不是数组也是最容易的，但我假设两者都是可能的。我只用ArrayList结构实现了这个。

public class CustomArrayAdapter extends ArrayAdapter<String> {

    private Context context;
    private ArrayList<YourClass> objects;
    //or with 2d array this might work:
    private String [][] strings2d;

    public CustomArrayAdapter (Context context, ArrayList<YourClass> objects) {
        super(context, -1, objects);
        this.context = context;
        this.objects = objects;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        //Get individual object to be displayed
        YourClass object = this.objects.get(position);
        //or with 2d array
        String[] strings1d = this.strings2d[position];

        String string1 = object.strings[1];  //Your class has array of strings as class var
        String string2 = object.strings[2];
        String string3 = object.strings[3];

        //Inflate view and get (custom) layout for each item in list 
        LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View customView = layoutInflater.inflate(R.layout.your_custom_list_item_layout, parent, false);

        //Get textView to display each String
        TextView textView1 = (TextView) customView.findViewById(R.id.text_field_1);
        TextView textView2 = (TextView) customView.findViewById(R.id.text_field_2);
        TextView textView3 = (TextView) customView.findViewById(R.id.text_field_2);

        //Set text of each textView
        textView1.setText(string1);
        textView1.setText(string2);
        textView1.setText(string3);

        //Or with 2d arrays
        textView1.setText(strings1d[0]);
        textView1.setText(strings1d[1]);
        textView1.setText(strings1d[2]);

        return customView;
    }

}

我没有对此进行测试，看它是否运行，显然你需要创建一个自定义类来保存字符串和自定义布局来显示ListView中的每个项目。

如何在同一水平线下的列表视图中显示2D <string>数组的内容？

1 个答案: