java - 如何将 ArrayAdapter 添加到 ArrayList>()？

Question

我遇到了 Android 问题我不知道如何添加 ArrayAdapter或 ListAdapter显示我的 2 dim Array。

我得到了:

 ArrayList<ArrayList<String>> laktoseList;
laktoseList = new ArrayList<ArrayList<String>>();

    laktoseList.add(new ArrayList<String>());
    laktoseList.get(0).add("Milch");
    laktoseList.get(0).add("15");
    laktoseList.add(new ArrayList<String>());
    laktoseList.get(1).add("Jogurht");
    laktoseList.get(1).add("11");
    laktoseList.add(new ArrayList<String>());
    laktoseList.get(2).add("Woot");
    laktoseList.get(2).add("19.5");


    ListView listViewName = (ListView) findViewById(R.id.listName);
    ListView listViewGramm = (ListView) findViewById(R.id.listGramm);


    MyCustomArrayAdapter nameAdapter = new MyCustomArrayAdapter(this, R.id.listName, laktoseList.get(0));
    MyCustomArrayAdapter grammAdapter = new MyCustomArrayAdapter(this, R.id.listGramm, laktoseList.get(1));

到现在为止是这样吗？我得到了项目名称和语法的 2 个昏暗数组。我有 2 ListViews在 ADT 中创建，这应该进去。

但我不知道如何为 ArrayList<ArrayList> 编写适配器. :(

将值设置到列表。

谢谢

编辑

但我需要 2 个值。这是一张图片 pic-upload.de/view-23169548/app.jpg.html 我需要说的是第一个列出名称，第二个列出其中的语法

Answer 1

你应该使用一个 ListView ，你应该为你的列表创建 pojo。我为你写的:)

你的 Activity (你可以使用 fragment ):

public class YourActivity extends Activity {
    ArrayList<Item> laktoseList = new ArrayList<Item>();

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

        //add your objects to list
        laktoseList.add(new Item("Milch", "15"));
        laktoseList.add(new Item("Jogurht", "11"));
        laktoseList.add(new Item("Woot", "19.5"));

        ListView listView = (ListView) findViewById(R.id.your_listview);

        ItemListAdapter adapter = new ItemListAdapter(this, list_item_laktose, laktoseList);
        listView.setAdapter(adapter);
    }
}

自定义适配器:

public class ItemListAdapter extends ArrayAdapter<Item> {

    private ArrayList<Item> mDatas;
    private Context mContext;
    private LayoutInflater mInflater;
    private int mListItemResourceID;

    public ItemListAdapter(
            Context context, int listItemResourceId, ArrayList<Item> items) {
        super(context, listItemResourceId, items);
        mDatas = items;
        mContext = context;
        mInflater = LayoutInflater.from(mContext);
        mListItemResourceID = listItemResourceId;
    }

    class ViewHolder {
        TextView mNameTextView;
        TextView mGrammTextView;
    }

    @Override
    public View getView(final int position, View convertView, final ViewGroup parent) {
        final Item item = mDatas.get(position);
        final ViewHolder holder;

        if (convertView == null) {
            convertView = mInflater.inflate(mListItemResourceID, parent, false);

            holder = new ViewHolder();
            holder.mNameTextView = (TextView) convertView.findViewById(R.id.textview_name);
            holder.mGrammTextView = (TextView) convertView.findViewById(R.id.textview_gramm);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        if (item != null) {
            holder.mNameTextView.setText(item.getName());
            holder.mGrammTextView.setText(item.getGramm());
        }

        return convertView;
    }
}

POJO:

public class Item {
    private String name;
    private String gramm;
    //you can also add different variables

    public Item(String name, String gramm) {
        this.name = name;
        this.gramm = gramm;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGramm() {
        return gramm;
    }

    public void setGramm(String gramm) {
        this.gramm = gramm;
    }
}

list_item_laktose:

<?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="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textview_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/textview_gramm"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>