android spinner获取焦点,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 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 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 list) {

if (mAdapter != null) {

this.mList = list;

mAdapter.setDataList(list);

mAdapter.notifyDataSetChanged();

}

}

private class ListViewAdapter extends BaseAdapter {

private LayoutInflater inflater;

private ArrayList list;

public ListViewAdapter(Context context, ArrayList list) {

super();

this.inflater = LayoutInflater.from(context);

this.list = list;

}

public void setDataList(ArrayList 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;

}

}