Android开发自定义下拉框下拉列表

开发中难免有各种需求，近期项目中需要自定义下拉框的使用。实现效果如图，展开状态箭头向上，收起的时候箭头向下，选中状态选中条目颜色可变，可设置下拉框高度。效果如下

自定义CustomSpinner.java

public class CustomSpinner extends LinearLayout{private View view;
     private TextView tv_name;
     private ImageView ib;
 
     //界面控件
     private ImageView spinner;
     //构造qq号用到的集合
     private List list = new ArrayList();
     //布局加载器
     //自定义适配器
     private MyAdapter mAdapter;
     //PopupWindow
     private PopupWindow pop;
     //是否显示PopupWindow，默认不显示
     private boolean isPopShow = true;
     private ListView listView;
     private LayoutInflater mInflater;
     private OnItemSelectedListenerSpinner onItemSelectedListener;
     private int heiht;
     private int postion = 0;
 
     public CustomSpinner(Context context) {super(context);
         initView(context);
     }public CustomSpinner(Context context, @Nullable AttributeSet attrs) {super(context, attrs);
         initView(context);
     }public CustomSpinner(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);
         initView(context);
     }public CustomSpinner(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {super(context, attrs, defStyleAttr, defStyleRes);
         initView(context);
     }private void initView(final Context context) {mInflater = LayoutInflater.from(context);
         view = mInflater.inflate(R.layout.layout_customspinner, null);
 
         mAdapter = new MyAdapter();
         tv_name = (TextView) view.findViewById(R.id.et_name);
         ib = (ImageView) view.findViewById(R.id.spinner);
         tv_name.setOnClickListener(new OnClickListener() {@Override
             public void onClick(View view) {L.e("isshow--"+isPopShow);
                 if (null != list){if(pop == null){listView = new ListView(context);
                         listView.setCacheColorHint(0x00000000);
                         listView.setDividerHeight(0);
                         listView.setBackgroundColor(Color.rgb(255,255,255));
                         listView.setAdapter(mAdapter);
                         listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Override
                             public void onItemClick(AdapterView adapterView, View view, int i, long l) {postion = i;
                                 mAdapter.notifyDataSetChanged();
                                 tv_name.setText(list.get(i));
                                 ib.setImageResource(R.drawable.ic_arrow_drop_down_black_24dp);
                                 pop.dismiss();
                                 isPopShow = true;
                                 CustomSpinner.this.view.setTag(getId());
                                 onItemSelectedListener.onItemSelected(CustomSpinner.this.view,view,i,l);
                             }});
 
                         if (heiht == 0){int hei = setListViewHeightBasedOnChildren(listView);
                             //这里设置下拉框的高度
                             if (hei >= 550){pop = new PopupWindow(listView, CustomSpinner.this.view.getWidth(), 550, true);
                             }else{pop = new PopupWindow(listView, CustomSpinner.this.view.getWidth(), hei, true);
                             }}else{pop = new PopupWindow(listView, CustomSpinner.this.view.getWidth(),heiht, true);
                         }pop.setBackgroundDrawable(new ColorDrawable(0x00000000));
                         pop.setFocusable(true);
                         pop.setOnDismissListener(new PopupWindow.OnDismissListener() {@Override
                             public void onDismiss() {isPopShow = true;
                                 ib.setImageResource(R.drawable.ic_arrow_drop_down_black_24dp);
                             }});
                         ib.setImageResource(R.drawable.ic_arrow_drop_down_black_24dp_right);
                         pop.showAsDropDown(view,0, 0);
                         isPopShow = false;
                     }else{if(isPopShow){ib.setImageResource(R.drawable.ic_arrow_drop_down_black_24dp_right); //向上的箭头
                             pop.showAsDropDown(view, 0, 0);
                             isPopShow = false;
                         }else{ib.setImageResource(R.drawable.ic_arrow_drop_down_black_24dp); //向下的箭头
                             pop.dismiss();
                             isPopShow = true;
                         }}}onClickCustom();
             }});
         if (list == null || list.size() == 0){tv_name.setText("");
         }else{tv_name.setText(list.get(0));
         }addView(view);
     }public static int setListViewHeightBasedOnChildren(ListView listView) {// 获取ListView对应的Adapter
         ListAdapter listAdapter = listView.getAdapter();
         if (listAdapter == null) {return 0;
         }int totalHeight = 0;
         for (int i = 0; i < listAdapter.getCount(); i++) { // listAdapter.getCount()返回数据项的数目
             View listItem = listAdapter.getView(i, null, listView);
             listItem.measure(0, 0); // 计算子项View 的宽高
             totalHeight += listItem.getMeasuredHeight(); // 统计所有子项的总高度
         }int ff = totalHeight+ (listView.getDividerHeight() * (listAdapter.getCount() - 1));
         return ff;
     }public void onClickCustom(){}public void attachDataSource(List list){this.list = list;
         tv_name.setText(list.get(0));
     }public void setOnItemSelectedListener(OnItemSelectedListenerSpinner onItemSelectedListener){this.onItemSelectedListener = onItemSelectedListener;
         Log.e("www","走了");
     }public void setSpinnerHeiht(int heiht){this.heiht = heiht;
     }public void setSelectedIndex(int index){tv_name.setText(list.get(index));
 
         onItemSelectedListener.onItemSelected(null,null,index,index);
     }private class MyAdapter extends BaseAdapter {@Override
         public int getCount() {// TODO Auto-generated method stub
             return list.size();
         }@Override
         public Object getItem(int position) {// TODO Auto-generated method stub
             return list.get(position);
         }@Override
         public long getItemId(int position) {// TODO Auto-generated method stub
             return position;
         }@Override
         public View getView(final int position, View convertView, ViewGroup parent) {View view = mInflater.inflate(R.layout.item, null);
             if (position == CustomSpinner.this.postion){//选中条目的背景色
                 view.setBackgroundColor(Color.rgb(26,208,189));
             }final TextView tv_name = (TextView) view.findViewById(R.id.tv_name);
             tv_name.setText(list.get(position));
             //设置按钮的监听事件
             view.setTag(tv_name);
             return view;
         }}@Override
     public void destroyDrawingCache() {if (pop != null && pop.isShowing()){pop.dismiss();
         }super.destroyDrawingCache();
     }
 }
 

//布局文件layout_customspinner

//布局item.xml