Android很nice的Spinner(NiceSpinner)

释放双眼,带上耳机,听听看~!
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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