Android 自定义spinner下拉框实现的实现

请支持原创：http://blog.csdn.NET/geniuseoe2012/article/details/8723702

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：

public class SpinerPopWindow extends PopupWindow implements OnItemClickListener{

    private Context mContext;
    private ListView mListView;
    private NormalSpinerAdapter mAdapter;
    private IOnItemSelectListener mItemSelectListener;

    public SpinerPopWindow(Context context)
    {
        super(context);

        mContext = context;
        init();
    }

    public void setItemListener(IOnItemSelectListener listener){
        mItemSelectListener = listener;
    }

    private void init()
    {
        View view = LayoutInflater.from(mContext).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);

        mAdapter = new NormalSpinerAdapter(mContext);
        mListView.setAdapter(mAdapter);
        mListView.setOnItemClickListener(this);
    }

    public void refreshData(List<String> list, int selIndex)
    {
        if (list != null && selIndex  != -)
        {
            mAdapter.refreshData(list, selIndex);
        }
    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View view, int pos, long arg3) {
        dismiss();
        if (mItemSelectListener != null){
            mItemSelectListener.onItemClick(pos);
        }
    }

}

主界面调用代码：

public class SpinerWindowDemoActivity extends Activity implements OnClickListener, AbstractSpinerAdapter.IOnItemSelectListener{
    /** Called when the activity is first created. */

    private View mRootView;
    private TextView mTView;
    private ImageButton mBtnDropDown;
    private List<String> nameList = new ArrayList<String>();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        setupViews();
    }

    private void setupViews(){
        mRootView = findViewById(R.id.rootView);

        mTView = (TextView) findViewById(R.id.tv_value);
        mBtnDropDown = (ImageButton) findViewById(R.id.bt_dropdown);
        mBtnDropDown.setOnClickListener(this);

        String[] names = getResources().getStringArray(R.array.hero_name);
        for(int i = ; i < names.length; i++){
            nameList.add(names[i]);
        }

        mSpinerPopWindow = new SpinerPopWindow(this);
        mSpinerPopWindow.refreshData(nameList, );
        mSpinerPopWindow.setItemListener(this);
    }

    @Override
    public void onClick(View view) {
        switch(view.getId()){
        case R.id.bt_dropdown:
            showSpinWindow();
            break;
        }
    }

    private void setHero(int pos){
        if (pos >=  && pos <= nameList.size()){
            String value = nameList.get(pos);

            mTView.setText(value);
        }
    }

    private SpinerPopWindow mSpinerPopWindow;
    private void showSpinWindow(){
        Log.e("", "showSpinWindow");
        mSpinerPopWindow.setWidth(mTView.getWidth());
        mSpinerPopWindow.showAsDropDown(mTView);
    }

    @Override
    public void onItemClick(int pos) {
        setHero(pos);
    }

}

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：

http://download.csdn.net/detail/geniuseoe2012/5184664

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/*=============================================================================*/

为使SpinerPopWindow更为通用，特修改或增加以下几个类

AbstractSpinerAdapter

　public abstract class AbstractSpinerAdapter<T> extends BaseAdapter {

    public static interface IOnItemSelectListener{
        public void onItemClick(int pos);
    };

     private Context mContext;
     private List<T> mObjects = new ArrayList<T>();
     private int mSelectItem = ;

     private LayoutInflater mInflater;

     public  AbstractSpinerAdapter(Context context){
         init(context);
     }

     public void refreshData(List<T> objects, int selIndex){
         mObjects = objects;
         if (selIndex < ){
             selIndex = ;
         }
         if (selIndex >= mObjects.size()){
             selIndex = mObjects.size() - ;
         }

         mSelectItem = selIndex;
     }

     private void init(Context context) {
            mContext = context;
            mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     }

    @Override
    public int getCount() {

        return mObjects.size();
    }

    @Override
    public Object getItem(int pos) {
        return mObjects.get(pos).toString();
    }

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

    @Override
    public View getView(int pos, View convertView, ViewGroup arg2) {
         ViewHolder viewHolder;

         if (convertView == null) {
             convertView = mInflater.inflate(R.layout.spiner_item_layout, null);
             viewHolder = new ViewHolder();
             viewHolder.mTextView = (TextView) convertView.findViewById(R.id.textView);
             convertView.setTag(viewHolder);
         } else {
             viewHolder = (ViewHolder) convertView.getTag();
         }

         Object item =  getItem(pos);
         viewHolder.mTextView.setText(item.toString());

         return convertView;
    }

    public static class ViewHolder
    {
        public TextView mTextView;
    }

}

SpinerPopWindow

public class SpinerPopWindow extends PopupWindow implements OnItemClickListener{

    private Context mContext;
    private ListView mListView;
    private AbstractSpinerAdapter mAdapter;
    private IOnItemSelectListener mItemSelectListener;

    public SpinerPopWindow(Context context)
    {
        super(context);

        mContext = context;
        init();
    }

    public void setItemListener(IOnItemSelectListener listener){
        mItemSelectListener = listener;
    }

    public void setAdatper(AbstractSpinerAdapter adapter){
        mAdapter = adapter;
        mListView.setAdapter(mAdapter);
    }

    private void init()
    {
        View view = LayoutInflater.from(mContext).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.setOnItemClickListener(this);
    }

    public <T> void refreshData(List<T> list, int selIndex)
    {
        if (list != null && selIndex  != -)
        {
            if (mAdapter != null){
                mAdapter.refreshData(list, selIndex);
            }
        }
    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View view, int pos, long arg3) {
        dismiss();
        if (mItemSelectListener != null){
            mItemSelectListener.onItemClick(pos);
        }
    }

}

CustemObject

public class CustemObject {

    public String data = "";

    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return data;
    }

}

CustemSpinerAdapter

public class CustemSpinerAdapter extends AbstractSpinerAdapter<CustemObject>{

    public CustemSpinerAdapter(Context context) {
        super(context);
    }

}

SpinerWindowDemoActivity

public class SpinerWindowDemoActivity extends Activity implements OnClickListener, AbstractSpinerAdapter.IOnItemSelectListener{
    /** Called when the activity is first created. */

    private View mRootView;
    private TextView mTView;
    private ImageButton mBtnDropDown;
    private List<CustemObject> nameList = new ArrayList<CustemObject>();
    private AbstractSpinerAdapter mAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        setupViews();
    }

    private void setupViews(){
        mRootView = findViewById(R.id.rootView);

        mTView = (TextView) findViewById(R.id.tv_value);
        mBtnDropDown = (ImageButton) findViewById(R.id.bt_dropdown);
        mBtnDropDown.setOnClickListener(this);

        String[] names = getResources().getStringArray(R.array.hero_name);
        for(int i = ; i < names.length; i++){
            CustemObject object = new CustemObject();
            object.data = names[i];
            nameList.add(object);
        }

        mAdapter = new CustemSpinerAdapter(this);
        mAdapter.refreshData(nameList, );

        mSpinerPopWindow = new SpinerPopWindow(this);
        mSpinerPopWindow.setAdatper(mAdapter);
        mSpinerPopWindow.setItemListener(this);
    }

    @Override
    public void onClick(View view) {
        switch(view.getId()){
        case R.id.bt_dropdown:
            showSpinWindow();
            break;
        }
    }

    private void setHero(int pos){
        if (pos >=  && pos <= nameList.size()){
            CustemObject value = nameList.get(pos);

            mTView.setText(value.toString());
        }
    }

    private SpinerPopWindow mSpinerPopWindow;
    private void showSpinWindow(){
        Log.e("", "showSpinWindow");
        mSpinerPopWindow.setWidth(mTView.getWidth());
        mSpinerPopWindow.showAsDropDown(mTView);
    }

    @Override
    public void onItemClick(int pos) {
        setHero(pos);
    }

}

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！

新工程链接如下：http://download.csdn.net/detail/geniuseoe2012/5412647

OK，本节课到此为止！欲知更多Android-UI技巧，请关注窝的下一堂课~

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