ListView的常用方式

方式一：加载简单的文本

注意：ListView也是一个控件，所以像button一样加载即可，它不能直接接受数组数据，而是要通过一个适配器Adapter，常用ArrayAdapter

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        ListView listView = (ListView) findViewById(R.id.list_view);
        String[] data = {"1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18"};
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, data);
        listView.setAdapter(adapter);
    }

}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </ListView>

</LinearLayout>

方式二：自定义承载项，可以加图片文字。主要关注Adapter的写法！

MainActivity

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        
        ListView listView = (ListView) findViewById(R.id.list_view);
        List<Item> data = new ArrayList<Item>();
        // 简单设置数据项目
        for(int i=0;i<18;i++){
            data.add(new Item(R.drawable.ic_launcher, i+""));
        }
        MyAdapter adapter = new MyAdapter(this, R.layout.list_view_item, data);
        listView.setAdapter(adapter);
    }

}

<?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" >

    <ImageView
        android:id="@+id/item_img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/item_text"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:layout_weight="1" />

</LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
     >

    <ListView 
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        ></ListView>

</LinearLayout>

MyAdapter.java自定义适配器，继承自ArrayAdapter

public class MyAdapter extends ArrayAdapter<Item> {
    private int resourceId;
    public MyAdapter(Context context,int textViewResourceId,
            List<Item> objects) {
        super(context,textViewResourceId, objects);
        // 这里传入承载子项，即R.layout.list_view_item
        resourceId = textViewResourceId;
    }
    // 所有的子项滚入屏幕内都会执行的方法,这里执行加载图片和文本的操作即可
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // 得到Item对象
        Item item = getItem(position);
        View view;
        ViewHolder viewHolder;
        if(convertView == null){
            // 为空才加载布局
            view = LayoutInflater.from(getContext()).inflate(resourceId, null);
            viewHolder = new ViewHolder();
            // 设置holder标签
            viewHolder.img = (ImageView) view.findViewById(R.id.item_img);
            viewHolder.text = (TextView) view.findViewById(R.id.item_text);
            view.setTag(viewHolder);
        }else {
            view = convertView;
            viewHolder = (ViewHolder) view.getTag();
        }
        
        // 显示图片和文本
        viewHolder.img.setImageResource(item.getImgSouceId());
        viewHolder.text.setText(item.getText());
        
        return view;
    }
    /**
     * 定义一个ViewHolder，用来提升ListView的效率，避免大量的解析xml文件，即:findViewById 
     */
    private class ViewHolder{
        ImageView img;
        TextView text;
    }
    
}