1500字范文 > Android开发自定义下拉框下拉列表

Android开发自定义下拉框下拉列表

时间：2022-11-17 12:18:30

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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<String> list = new ArrayList<String>(); //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<String> 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

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" android:gravity="center"> <TextView android:id="@+id/tv_name" android:layout_width="match_parent" android:layout_height="30dp" android:textSize="14sp" android:gravity="center" android:layout_marginRight="14dp" android:text="aaaaa" /></LinearLayout>

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