Android很nice的Spinner(NiceSpinner)

import android.content.Context;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.PopupWindow;import android.widget.RelativeLayout;import android.widget.TextView;import java.util.ArrayList;/**  * Created by seven on 2016/4/28.  */ public class NiceSpinner extends RelativeLayout implements View.OnClickListener {    private static final int DEFAULT_MORE_COUNT = 5;    private Context mContext;    //PopupWindow对象声明  private PopupWindow mPopupWindow;    private ArrayList<String> mList;    private View mPopView;    //当前选中的列表项位置  private int clickPsition = 0;    private TextView spinnerText;    private ImageView arrowImg;    private NiceSpinnerCallBack mCallBack;    private ListViewAdapter mAdapter;    private int moreCount;//加载更多数据  private int mRowNum;//最多显示多少条数据  private int mDefaultCount;//最多显示多少条数据   public NiceSpinner(Context context) {        super(context);        mContext = context;        init();    }    public NiceSpinner(Context context, AttributeSet attrs) {        super(context, attrs);        mContext = context;        init();    }    public void init() {        DisplayMetrics dm = mContext.getResources().getDisplayMetrics();        int screenWidth = dm.widthPixels;        int screenHeigh = dm.heightPixels;        this.setOnClickListener(this);        spinnerText = new TextView(mContext);        spinnerText.setId(R.id.spinner_text);        RelativeLayout.LayoutParams textParams = new RelativeLayout.LayoutParams(screenWidth / 6  , LayoutParams.WRAP_CONTENT);        textParams.addRule(RelativeLayout.CENTER_IN_PARENT);        arrowImg = new ImageView(mContext);        arrowImg.setImageResource(R.drawable.icon_spinner_arrow);        RelativeLayout.LayoutParams imageParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT  , RelativeLayout.LayoutParams.WRAP_CONTENT);        imageParams.addRule(RelativeLayout.CENTER_VERTICAL);        imageParams.addRule(RelativeLayout.RIGHT_OF, spinnerText.getId());        this.addView(spinnerText, textParams);        this.addView(arrowImg, imageParams);        //通过布局注入器，注入布局给View对象  mPopView = LayoutInflater.from(mContext).inflate(R.layout.layout_nice_spinner, null);        //通过view 和宽·高，构造PopopWindow  mPopupWindow = new PopupWindow(mPopView, ViewGroup.LayoutParams.MATCH_PARENT,                screenHeigh / 3, true);        //此处为popwindow 设置背景，同事做到点击外部区域，popwindow消失  mPopupWindow.setBackgroundDrawable(getResources().getDrawable(R.drawable.bg_white));    }    public void setText(String text) {        spinnerText.setText(text);    }    public void setDataList(ArrayList<String> list) {        this.mList = list;        if (spinnerText.getText().toString() == null ||                spinnerText.getText().toString().equals(""))            spinnerText.setText(this.mList.get(0));    }    @Override  public void onClick(View v) {        //设置焦点为可点击  mPopupWindow.setFocusable(true);//可以试试设为false的结果  //将window视图显示在NiceSpinner下面  mPopupWindow.showAsDropDown(this);        ListView lv = (ListView) mPopView.findViewById(R.id.list_nice_spinner);        mAdapter = new ListViewAdapter(mContext, mList);        lv.setAdapter(mAdapter);        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override  public void onItemClick(AdapterView<?> parent, View view,                                    int position, long id) {                if (clickPsition != position) {                    clickPsition = position;                }                mPopupWindow.dismiss();                moreCount = 0;                if (mCallBack != null) {                    mCallBack.setText(mList.get(position));                }            }        });        lv.setOnScrollListener(new AbsListView.OnScrollListener() {            @Override  public void onScrollStateChanged(AbsListView view, int scrollState) {                // 判断滚动到底部  if (view.getLastVisiblePosition() == view.getCount() - 1) {                    if (mCallBack != null && moreCount < mRowNum - mDefaultCount) {                        moreCount += DEFAULT_MORE_COUNT;                        mCallBack.loadData(moreCount, NiceSpinner.this);                    }                }            }            @Override  public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {            }        });        lv.setSelection(clickPsition);    }    public int getCurrentPosition() {        return clickPsition;    }    public void setDataCount(int rowNum, int defaultCount) {        mRowNum = rowNum;        mDefaultCount = defaultCount;    }    public void refresh(ArrayList<String> list) {        if (mAdapter != null) {            this.mList = list;            mAdapter.setDataList(list);            mAdapter.notifyDataSetChanged();        }    }    private class ListViewAdapter extends BaseAdapter {        private LayoutInflater inflater;        private ArrayList<String> list;        public ListViewAdapter(Context context, ArrayList<String> list) {            super();            this.inflater = LayoutInflater.from(context);            this.list = list;        }        public void setDataList(ArrayList<String> list) {            this.list = list;        }        @Override  public int getCount() {            return list.size();        }        @Override  public Object getItem(int position) {            // TODO Auto-generated method stub  return null;        }        @Override  public long getItemId(int position) {            // TODO Auto-generated method stub  return 0;        }        @Override  public View getView(int position, View convertView, ViewGroup parent) {            if (convertView == null) {                convertView = inflater.inflate(R.layout.item_nice_spinner, null);            }            TextView tv = (TextView) convertView.findViewById(R.id.spinner_text);            tv.setText(list.get(position));            ImageView imgView = (ImageView) convertView.findViewById(R.id.spinner_select);            if (clickPsition == position) {                imgView.setVisibility(View.VISIBLE);            } else {                imgView.setVisibility(View.INVISIBLE);            }            return convertView;        }    }    /**  * listView回调接口  */  public interface NiceSpinnerCallBack {        void loadData(int moreCount,View view);        void setText(String text);    }    public void addCallBack(NiceSpinnerCallBack callBack) {        this.mCallBack = callBack;    }}

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