自定义spinner下拉框

本文出自：http://blog.csdn.net/dt235201314/article/details/52372609

一丶简介

一直觉得自定义View该加强学习，自定义spinner下拉框就作为一个开始，网上一找一大把例子，前段时间找了一个还用到了工作中

二丶演示图

三丶代码实现

分析spinner组成：1.带边框的TextView   2.TextView右边显示上下箭头  3.TextView下显示装ListView显示item得Popupwindow。

SpinerPopWindow.java  自定义Popupwindow类 初始化PopupWindow显示的布局,以及一些参数,并且给listView设置适配器

public class SpinerPopWindow<T> extends PopupWindow {   private LayoutInflater inflater;   private ListView mListView;   private List<T> list;   private MyAdapter  mAdapter;      public SpinerPopWindow(Context context,List<T> list,OnItemClickListener clickListener) {      super(context);      inflater=LayoutInflater.from(context);      this.list=list;      init(clickListener);   }      private void init(OnItemClickListener clickListener){      View view = inflater.inflate(R.layout.spiner_window_layout, null);      setContentView(view);           setWidth(LayoutParams.WRAP_CONTENT);      setHeight(LayoutParams.WRAP_CONTENT);      setFocusable(true);          ColorDrawable dw = new ColorDrawable(0x00);      setBackgroundDrawable(dw);      mListView = (ListView) view.findViewById(R.id.listview);      mListView.setAdapter(mAdapter=new MyAdapter());      mListView.setOnItemClickListener(clickListener);   }      private class MyAdapter extends BaseAdapter{      @Override      public int getCount() {         return list.size();      }      @Override      public Object getItem(int position) {         return list.get(position);      }      @Override      public long getItemId(int position) {         return position;      }      @Override      public View getView(int position, View convertView, ViewGroup parent) {         ViewHolder holder=null;         if(convertView==null){            holder=new ViewHolder();            convertView=inflater.inflate(R.layout.spiner_item_layout, null);            holder.tvName=(TextView) convertView.findViewById(R.id.tv_name);            convertView.setTag(holder);         }else{            holder=(ViewHolder) convertView.getTag();         }         holder.tvName.setText(getItem(position).toString());         return convertView;      }   }      private class ViewHolder{      private TextView tvName;   }}

MainActivity.java  程序入口,初始化数据,初始化自定义PopupWIndow,TextView点击之后显示PopupWIndow,处理ListView的点击事件.

public class MainActivity extends Activity {   private SpinerPopWindow<String> mSpinerPopWindow;   private List<String> list;   private TextView tvValue;   @Override   protected void onCreate(Bundle savedInstanceState) {      super.onCreate(savedInstanceState);      setContentView(R.layout.activity_main);      initData();      tvValue = (TextView) findViewById(R.id.tv_value);      tvValue.setOnClickListener(clickListener);      mSpinerPopWindow = new SpinerPopWindow<String>(this, list,itemClickListener);      mSpinerPopWindow.setOnDismissListener(dismissListener);   }      private OnDismissListener  dismissListener=new OnDismissListener() {      @Override      public void onDismiss() {         setTextImage(R.drawable.icon_down);      }   };   private OnItemClickListener itemClickListener = new OnItemClickListener() {      @Override      public void onItemClick(AdapterView<?> parent, View view, int position,long id) {         mSpinerPopWindow.dismiss();         tvValue.setText(list.get(position));         Toast.makeText(MainActivity.this, "�����:" + list.get(position),Toast.LENGTH_LONG).show();      }   };   private OnClickListener clickListener = new OnClickListener() {      @Override      public void onClick(View v) {         switch (v.getId()) {         case R.id.tv_value:            mSpinerPopWindow.setWidth(tvValue.getWidth());            mSpinerPopWindow.showAsDropDown(tvValue);            setTextImage(R.drawable.icon_up);            break;         }      }   };   private void initData() {      list = new ArrayList<String>();      for (int i = 0; i < 5; i++) {         list.add("test:" + i);      }   }   private void setTextImage(int resId) {      Drawable drawable = getResources().getDrawable(resId);      drawable.setBounds(0, 0, drawable.getMinimumWidth(),drawable.getMinimumHeight());      tvValue.setCompoundDrawables(null, null, drawable, null);   }}

spiner_item_layout.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:gravity="center_vertical">    <TextView        android:id="@+id/tv_name"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:padding="10dp"        android:text="fdsfdsfdsf"        android:textColor="@color/content_color"        android:textSize="20sp"/></LinearLayout>

spiner_window_layout.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:layout_alignParentRight="true"    android:orientation="vertical">    <ListView        android:id="@+id/listview"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:cacheColorHint="#00000000"        android:background="@drawable/shape_popupwindow_list_bg"        android:scrollbars="none" >    </ListView></LinearLayout>

主页面就一个TextView（略）

四丶总结

1.这是上周得事情，压倒现在，很多事情需要规划

2.项目进入写P层，M层，调接口后台取数据得阶段，正是不擅长的地方，要学的很多