spinner

———————————spinner

第一步： 添加一个下拉列表项，添加

private List<String > list = enew aRRAYlIST<String>();

list.add("北京")；《数据源》

list.add("北京")；

list.add("北京")；

list.add("北京")；

list.add("北京")；

第二步：为下拉列表定义一个数据适配器，（ArrayAdapter）,

adapter = new  ArrayAdapter<String>(this,adnroid,R.layout.simple_spinner_item,list);

《定时适配器数据源》

第三步：为适配器设置下拉列表时的菜单样式

adapter.setDropDwonViewResource(android.R.layout.simple_spinner_dropdown_item);

第四步：将适配器添加到下拉列表上；

myDpinner.setAdapter(adapter);`这里写代码片`

第五步： 为下拉列表设置各种时间的响应，这个事件响应菜单被选中

mySpinner.setOnItenSelectedListener(new Spinner.OnItemSelectedListener(){....});

public class MainActivity extends Activity {

    private TextView myTextView;
    private Spinner mySpinner;
    private SimpleAdapter adapter;
    private List<Map<String, Object>> dataList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        // 第一步：添加一个下拉列表项的list，这里添加的项就是下拉列表的菜单项
        dataList = new ArrayList<Map<String, Object>>();
        getData();
        myTextView = (TextView) findViewById(R.id.textView);
        mySpinner = (Spinner) findViewById(R.id.spinner);
        // 第二步：为下拉列表定义一个适配器，这里就用到里前面定义的list。
        adapter=new SimpleAdapter(this, dataList, R.layout.item, new String[]{"image","text"}, new int[]{R.id.image,R.id.text});

        // 第三步：为适配器设置下拉列表下拉时的菜单样式。
        adapter.setDropDownViewResource(R.layout.item);
        // 第四步：将适配器添加到下拉列表上
        mySpinner.setAdapter(adapter);
        // 第五步：为下拉列表设置各种事件的响应，这个事响应菜单被选中

        mySpinner
                .setOnItemSelectedListener(new Spinner.OnItemSelectedListener() {
                    public void onItemSelected(AdapterView<?> arg0, View arg1,
                            int arg2, long arg3) {
                        // TODO Auto-generated method stub
                        /* 将所选mySpinner 的值带入myTextView 中 */
                        myTextView.setText("您选择的是：" + adapter.getItem(arg2));
                    }

                    public void onNothingSelected(AdapterView<?> arg0) {
                        // TODO Auto-generated method stub
                        myTextView.setText("NONE");
                    }
                });

    }

    private void getData() {
        // TODO Auto-generated method stub
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("image", R.drawable.ic_launcher);
        map.put("text", "北京");
        Map<String, Object> map2 = new HashMap<String, Object>();
        map2.put("image", R.drawable.ic_launcher);
        map2.put("text", "上海");
        Map<String, Object> map3 = new HashMap<String, Object>();
        map3.put("image", R.drawable.ic_launcher);
        map3.put("text", "广州");
        Map<String, Object> map4 = new HashMap<String, Object>();
        map4.put("image", R.drawable.ic_launcher);
        map4.put("text", "深圳");
        dataList.add(map);
        dataList.add(map2);
        dataList.add(map3);
        dataList.add(map4);
    }

}

<Spinner android:id="@+id/spinner" android:layout_width="fill_parent" android:layout_height="wrap_content"></Spinner>

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

<ImageView android:id="@+id/image" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:layout_alignParentLeft="true"
 android:layout_centerVertical="true" 
 android:layout_marginLeft="10dp" android:src="@drawable/ic_launcher"/>

<TextView android:id="@+id/text" android:layout_width="wrap_content"
 android:layout_height="wrap_content"
  android:layout_centerVertical="true" android:layout_marginLeft="20dp" 
  android:layout_toRightOf="@id/image" 
  android:text="None"/>
</RelativeLayout>

================================

MainActivity.java

public class MainActivity extends Activity {
    private EditText input;
    private ImageView downArrow;
    private List<String> msgList;
    private PopupWindow popWin;
    private ListView listView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        input = (EditText) findViewById(R.id.input);
        downArrow = (ImageView) findViewById(R.id.down_arrow);

        msgList = new ArrayList<String>();
        for (int i = 0; i < 20; i++) {
            msgList.add("1000000000"+i);
        }

        initListView();
        downArrow.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {   
                //定义 popupWindow
                popWin = new PopupWindow(MainActivity.this);
                popWin.setWidth(input.getWidth());      //设置宽度
                popWin.setHeight(200);                  //设置popWin 高度

                popWin.setContentView(listView);         //为popWindow填充内容
                popWin.setOutsideTouchable(true);        // 点击popWin 以处的区域，自动关闭 popWin

                popWin.showAsDropDown(input, 0, 0);      //设置 弹出窗口，显示的位置

            }
        });     
    }

    private void initListView() {
        listView = new ListView(this);
        listView.setBackgroundResource(R.drawable.listview_background); //设置listView 背景
        listView.setDivider(null);                                      //设置条目之间的分隔线为null
        listView.setVerticalScrollBarEnabled(false);                    // 关闭水平横线
        listView.setAdapter(new MyListAdapter());           
    }

    private class MyListAdapter extends BaseAdapter{

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

        @Override
        public Object getItem(int position) {
            return position;
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            ViewHolder holder;
            if(convertView == null){
                convertView = View.inflate(getApplicationContext(), R.layout.list_item, null);
                holder = new ViewHolder();

                holder.delete = (ImageView) convertView.findViewById(R.id.delete);
                holder.tv_msg =(TextView) convertView.findViewById(R.id.tv_list_item);
                convertView.setTag(holder);
            }else{
                holder = (ViewHolder) convertView.getTag();
            }

            holder.tv_msg.setText(msgList.get(position));

            holder.delete.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                //删除对应的条目
                    msgList.remove(position);

                    //刷新listView
                    MyListAdapter.this.notifyDataSetChanged();
                }
            });
            convertView.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    //设置输入框 
                    input.setText(msgList.get(position));

                    popWin.dismiss();
                }
            });

            return convertView;
        }
        }

    private class ViewHolder{
        TextView tv_msg;
        ImageView delete;
    }

}

activity_main.xml

    <EditText
        android:id="@+id/input"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp"
        android:text="@string/hello_world" />


    <ImageView 
        android:id="@+id/down_arrow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/down_arrow"
        android:layout_alignRight="@id/input"
        android:clickable="true"
        android:layout_marginTop="20dp"
        />

list_item.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:orientation="horizontal"
    tools:context=".MainActivity" >

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/user" />

    <TextView
        android:id="@+id/tv_list_item"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="center_horizontal"
        android:text="@string/hello_world" />

    <ImageView
        android:id="@+id/delete"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/delete" />

</LinearLayout>