列表ListView和ListActivity以及使用SimpleAdapter

素颜马尾好姑娘i 2023-10-10 05:26 47阅读 0赞

创建listview有2种方式

1>直接使用ListView进行创建

2>让Activity继承ListActivity

下面是listview常用的一些属性

![17160911-2068d2456973458da458d1a2541ac846.jpg][]

案例:

这里使用ArrayAdapter指定了一个textViewResourceId,它代表listview中每个item的外观形式

![17162146-f55391be3a1c4b74b04d5684f62428a2.jpg][]

基于ListActivity实现的列表

如果一个窗口仅仅要显示一个列表,可以直接让activity继承ListActivity,并且无需调用setContentView()来指定某个界面,而是通过传入一个Adapter显示列表信息

也就是说它可以没有布局文件

public class MainActivity2 extends ListActivity {
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
    
            String[] names = new String[] { "张三", "李四", "wangwu", "赵六" };
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                    android.R.layout.simple_list_item_multiple_choice, names);
            setListAdapter(adapter);
        }
    }

当然也可以给他指定一个布局setContentView(R.layout.xxx),但是listview属性必须指定一个id:  android:id="@+id/android:list"; 否则运行报错

使用SimpleAdapter创建ListVIew

public class MainActivity extends Activity {
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.list);
    
            ListView lv = (ListView) findViewById(R.id.lv);
    
            String[] names = new String[] { "张三", "李四", "wangwu", "赵六" };
            List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();
            for (int i = 0; i < names.length; i++) {
                Map<String, Object> hashMap = new HashMap<String, Object>();
                hashMap.put("name", names[i]);
                data.add(hashMap);
            }
    
            lv.setAdapter(new SimpleAdapter(this, data, R.layout.list,
                    new String[] { "name" }, new int[] {R.id.tv}));
        }
    
    }

xml

转载于:https://www.cnblogs.com/android-zcq/p/3140575.html

[17160911-2068d2456973458da458d1a2541ac846.jpg]: https://images0.cnblogs.com/blog/538831/201306/17160911-2068d2456973458da458d1a2541ac846.jpg
[17162146-f55391be3a1c4b74b04d5684f62428a2.jpg]: https://images0.cnblogs.com/blog/538831/201306/17162146-f55391be3a1c4b74b04d5684f62428a2.jpg