从ListArray填充自定义ListView

Question

我有以下课程:

public class Person {

    public String name;
    public String description;

    public Board(String name, String description) {
        this.name = name;
        this.description = description;
    }

    public String getName()
    {
        return this.name;
    }

    public String getDescription()
    {
        return this.description;
    }
}

然后,我有ArrayList<Person>一些这些数据.

我想要做的是填充我的ListView,我做了一个(坏)模型,我希望它看起来像:

在看了一些关于这个在线的信息之后,我做了一个新的布局,我在其中放了一个Medium TextView,下面有一个Small TextView,但现在我很困惑,我怎么能用我的MainActivity上的ListView链接它然后用我的数据填充它ArrayList<Person>.

Answer 1

首先,您需要为您的行设置自定义布局:

/res/layout/my_row_layout.xml

<?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"
    android:text="Medium Text"
    android:textAppearance="?android:attr/textAppearanceMedium" />

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

之后,您将需要一个ArrayAdapter:

public class MyListAdapter extends ArrayAdapter<Person> {

private Context context;
private ArrayList<Person> allPersons;

private LayoutInflater mInflater;
private boolean mNotifyOnChange = true;

public MyListAdapter(Context context, ArrayList<Person> mPersons) {
    super(context, R.layout.my_row_layout);
    this.context = context;
    this.allPersons = new ArrayList<Person>(mPersons);
    this.mInflater = LayoutInflater.from(context);
}

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

@Override
public Person getItem(int position) {
    return allPersons .get(position);
}

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

@Override
public int getPosition(Person item) {
    return allPersons .indexOf(item);
}

@Override
public int getViewTypeCount() {
    return 1; //Number of types + 1 !!!!!!!!
}

@Override
public int getItemViewType(int position) {
    return 1;
}


@Override
public View getView(int position, View convertView, ViewGroup parent) {
    final ViewHolder holder;
    int type = getItemViewType(position);
    if (convertView == null) {
        holder = new ViewHolder();
        switch (type) {
        case 1:
            convertView = mInflater.inflate(R.layout.my_row_layout,parent, false);
            holder.name = (TextView) convertView.findViewById(R.id.textview_name);
            holder.description = (TextView) convertView.findViewById(R.id.textview_description);
            break;
        }
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }
    holder.name.setText(allPersons.get(position).getName());
    holder.description.setText(allPersons.get(position).getDescription());
    holder.pos = position;
    return convertView;
}

@Override
public void notifyDataSetChanged() {
    super.notifyDataSetChanged();
    mNotifyOnChange = true;
}

public void setNotifyOnChange(boolean notifyOnChange) {
    mNotifyOnChange = notifyOnChange;
}


//---------------static views for each row-----------//
     static class ViewHolder {

         TextView name;
         TextView description;
         int pos; //to store the position of the item within the list
     }
}

在您的活动中,您可以这样做:

public class SecondActivity extends ListActivity {

    private ArrayList<Person> persons;
    private MyListAdapter mAdapter;

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

        //fill the arraylist of persons

        this.mAdapter = new MyListAdapter(this, persons);
        setListAdapter(mAdapter);

    }

}

最后:

/res/layout/activity_main.xml

<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" >

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

注意ListView的id:如果要将活动扩展为ListActivity,则列表的id必须是@android:id/list.

希望这对你有所帮助!