说到android下拉框spineer，框架中虽有现成的控件，但实际效果可能并不是我们所需要的那种，如下图：
其实我们更需要的是像WEB那种风格，如图所示：
其实实现也很简单，就是自定义个popwindow就可以了
下面贴上代码片段：
1. public class SpinerPopWindow extends PopupWindow implements OnItemClickListener{
2.
3. private Context mContext;
4. private ListView mListView;
5. private NormalSpinerAdapter mAdapter;
6. private IOnItemSelectListener mItemSelectListener;
7.
8.
9. public SpinerPopWindow(Context context)
10. {
11. super(context);
12.
13. mContext = context;
14. init();
15. }
16.
17.
18. public void setItemListener(IOnItemSelectListener listener){
19. mItemSelectListener = listener;
20. }
21.
22.
23. private void init()
24. {
25. null);
26. setContentView(view);
27. setWidth(LayoutParams.WRAP_CONTENT);
28. setHeight(LayoutParams.WRAP_CONTENT);
29.
30. true);
31. new ColorDrawable(0x00);
32. setBackgroundDrawable(dw);
33.
34.
35. mListView = (ListView) view.findViewById(R.id.listview);
36.
37.
38. new NormalSpinerAdapter(mContext);
39. mListView.setAdapter(mAdapter);
40. this);
41. }
42.
43.
44. public void refreshData(List<String> list, int selIndex)
45. {
46. if (list != null && selIndex != -1)
47. {
48. mAdapter.refreshData(list, selIndex);
49. }
50. }
51.
52.
53. @Override
54. public void onItemClick(AdapterView<?> arg0, View view, int pos, long arg3) {
55. dismiss();
56. if (mItemSelectListener != null){
57. mItemSelectListener.onItemClick(pos);
58. }
59. }
60.
61.
62.
63. }主界面调用代码：
1. public class SpinerWindowDemoActivity extends Activity implements OnClickListener, AbstractSpinerAdapter.IOnItemSelectListener{
2. /** Called when the activity is first created. */
3.
4. private View mRootView;
5. private TextView mTView;
6. private ImageButton mBtnDropDown;
7. private List<String> nameList = new ArrayList<String>();
8.
9.
10. @Override
11. public void onCreate(Bundle savedInstanceState) {
12. super.onCreate(savedInstanceState);
13. setContentView(R.layout.main);
14.
15. setupViews();
16. }
17.
18.
19. private void setupViews(){
20. mRootView = findViewById(R.id.rootView);
21.
22. mTView = (TextView) findViewById(R.id.tv_value);
23. mBtnDropDown = (ImageButton) findViewById(R.id.bt_dropdown);
24. this);
25.
26.
27. String[] names = getResources().getStringArray(R.array.hero_name);
28. for(int i = 0; i < names.length; i++){
29. nameList.add(names[i]);
30. }
31.
32.
33. new SpinerPopWindow(this);
34. 0);
35. this);
36. }
37.
38.
39. @Override
40. public void onClick(View view) {
41. switch(view.getId()){
42. case R.id.bt_dropdown:
43. showSpinWindow();
44. break;
45. }
46. }
47.
48.
49. private void setHero(int pos){
50. if (pos >= 0 && pos <= nameList.size()){
51. String value = nameList.get(pos);
52.
53. mTView.setText(value);
54. }
55. }
56.
57.
58. private SpinerPopWindow mSpinerPopWindow;
59. private void showSpinWindow(){
60. "", "showSpinWindow");
61. mSpinerPopWindow.setWidth(mTView.getWidth());
62. mSpinerPopWindow.showAsDropDown(mTView);
63. }
64.
65.
66. @Override
67. public void onItemClick(int pos) {
68. setHero(pos);
69. }
70.
71. }就这么简单，具体UI美化大家再修改下xml就可以了
下面附上工程链接：
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/*=============================================================================*/
为使SpinerPopWindow更为通用，特修改或增加以下几个类
AbstractSpinerAdapter
1. public abstract class AbstractSpinerAdapter<T> extends BaseAdapter {
2.
3. public static interface IOnItemSelectListener{
4. public void onItemClick(int pos);
5. };
6.
7. private Context mContext;
8. private List<T> mObjects = new ArrayList<T>();
9. private int mSelectItem = 0;
10.
11. private LayoutInflater mInflater;
12.
13. public AbstractSpinerAdapter(Context context){
14. init(context);
15. }
16.
17. public void refreshData(List<T> objects, int selIndex){
18. mObjects = objects;
19. if (selIndex < 0){
20. 0;
21. }
22. if (selIndex >= mObjects.size()){
23. 1;
24. }
25.
26. mSelectItem = selIndex;
27. }
28.
29. private void init(Context context) {
30. mContext = context;
31. mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
32. }
33.
34.
35. @Override
36. public int getCount() {
37.
38. return mObjects.size();
39. }
40.
41. @Override
42. public Object getItem(int pos) {
43. return mObjects.get(pos).toString();
44. }
45.
46. @Override
47. public long getItemId(int pos) {
48. return pos;
49. }
50.
51. @Override
52. public View getView(int pos, View convertView, ViewGroup arg2) {
53. ViewHolder viewHolder;
54.
55. if (convertView == null) {
56. null);
57. new ViewHolder();
58. viewHolder.mTextView = (TextView) convertView.findViewById(R.id.textView);
59. convertView.setTag(viewHolder);
60. else {
61. viewHolder = (ViewHolder) convertView.getTag();
62. }
63.
64.
65. Object item = getItem(pos);
66. viewHolder.mTextView.setText(item.toString());
67.
68. return convertView;
69. }
70.
71. public static class ViewHolder
72. {
73. public TextView mTextView;
74. }
75.
76.
77. }
SpinerPopWindow
1. public class SpinerPopWindow extends PopupWindow implements OnItemClickListener{
2.
3. private Context mContext;
4. private ListView mListView;
5. private AbstractSpinerAdapter mAdapter;
6. private IOnItemSelectListener mItemSelectListener;
7.
8.
9. public SpinerPopWindow(Context context)
10. {
11. super(context);
12.
13. mContext = context;
14. init();
15. }
16.
17.
18. public void setItemListener(IOnItemSelectListener listener){
19. mItemSelectListener = listener;
20. }
21.
22. public void setAdatper(AbstractSpinerAdapter adapter){
23. mAdapter = adapter;
24. mListView.setAdapter(mAdapter);
25. }
26.
27.
28. private void init()
29. {
30. null);
31. setContentView(view);
32. setWidth(LayoutParams.WRAP_CONTENT);
33. setHeight(LayoutParams.WRAP_CONTENT);
34.
35. true);
36. new ColorDrawable(0x00);
37. setBackgroundDrawable(dw);
38.
39.
40. mListView = (ListView) view.findViewById(R.id.listview);
41. this);
42. }
43.
44.
45. public <T> void refreshData(List<T> list, int selIndex)
46. {
47. if (list != null && selIndex != -1)
48. {
49. if (mAdapter != null){
50. mAdapter.refreshData(list, selIndex);
51. }
52. }
53. }
54.
55.
56. @Override
57. public void onItemClick(AdapterView<?> arg0, View view, int pos, long arg3) {
58. dismiss();
59. if (mItemSelectListener != null){
60. mItemSelectListener.onItemClick(pos);
61. }
62. }
63.
64.
65.
66. }CustemObject
1. <span style="color:#3366ff;">public class CustemObject {
2.
3. public String data = "";
4.
5. @Override
6. public String toString() {
7. // TODO Auto-generated method stub
8. return data;
9. }
10.
11.
12. }</span>
CustemSpinerAdapter
1. public class CustemSpinerAdapter extends AbstractSpinerAdapter<CustemObject>{
2.
3. public CustemSpinerAdapter(Context context) {
4. super(context);
5. }
6.
7. }SpinerWindowDemoActivity
1. public class SpinerWindowDemoActivity extends Activity implements OnClickListener, AbstractSpinerAdapter.IOnItemSelectListener{
2. /** Called when the activity is first created. */
3.
4. private View mRootView;
5. private TextView mTView;
6. private ImageButton mBtnDropDown;
7. private List<CustemObject> nameList = new ArrayList<CustemObject>();
8. private AbstractSpinerAdapter mAdapter;
9.
10. @Override
11. public void onCreate(Bundle savedInstanceState) {
12. super.onCreate(savedInstanceState);
13. setContentView(R.layout.main);
14.
15. setupViews();
16. }
17.
18.
19. private void setupViews(){
20. mRootView = findViewById(R.id.rootView);
21.
22. mTView = (TextView) findViewById(R.id.tv_value);
23. mBtnDropDown = (ImageButton) findViewById(R.id.bt_dropdown);
24. this);
25.
26.
27. String[] names = getResources().getStringArray(R.array.hero_name);
28. for(int i = 0; i < names.length; i++){
29. new CustemObject();
30. object.data = names[i];
31. nameList.add(object);
32. }
33.
34.
35. new CustemSpinerAdapter(this);
36. 0);
37.
38. new SpinerPopWindow(this);
39. mSpinerPopWindow.setAdatper(mAdapter);
40. this);
41. }
42.
43.
44. @Override
45. public void onClick(View view) {
46. switch(view.getId()){
47. case R.id.bt_dropdown:
48. showSpinWindow();
49. break;
50. }
51. }
52.
53.
54. private void setHero(int pos){
55. if (pos >= 0 && pos <= nameList.size()){
56. CustemObject value = nameList.get(pos);
57.
58. mTView.setText(value.toString());
59. }
60. }
61.
62.
63. private SpinerPopWindow mSpinerPopWindow;
64. private void showSpinWindow(){
65. "", "showSpinWindow");
66. mSpinerPopWindow.setWidth(mTView.getWidth());
67. mSpinerPopWindow.showAsDropDown(mTView);
68. }
69.
70.
71. @Override
72. public void onItemClick(int pos) {
73. setHero(pos);
74. }
75.
76. }自定义一个类重写toString方法（CustemObject），自定义一个继承自AbstractSpinerAdapter的类确定对象类型（CustemSpinerAdapter）
构造具体的AbstractSpinerAdapter类对象（CustemSpinerAdapter）
通过refreshData填充数据，然后调用SpinerPopWindow的setAdatper设置数据源，OK大功告成！
