Android 自定义spinner下拉选框

spinner下拉选框：其实原理很简单，PopupWindow(ListView)+layout(textView,imageView)这样自定义更能适应需求，layout onClick时间监听PopupWindow show or dismiss

同时，dismiss时，update textView，下面我这里找了个开源的Spinner：

package com.example.widget;import android.annotation.SuppressLint;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Path;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.graphics.drawable.ShapeDrawable;import android.graphics.drawable.shapes.PathShape;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.widget.AbsListView;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.Button;import android.widget.ListAdapter;import android.widget.ListView;import android.widget.PopupWindow;import com.example.ui.R;public class SpinnerWidget extends Button {protected PopupWindow popup = null;private SpinnerWidget topButton;/** * 自定义listView 实现圆角功能 */protected CornerListView mListView;private ArrowView arrow;private OnItemSeletedListener changListener;private Context mContext;/** * Button topButton to addView * @param context * @param attrs */@SuppressLint({ "NewApi", "Recycle" })public SpinnerWidget(Context context, AttributeSet attrs) {super(context, attrs);this.mContext = context;topButton = this;initView(mContext);}private void initView(final Context c){arrow = new ArrowView(c, null, topButton);topButton.setCompoundDrawables(null, null, arrow.getDrawable(), null);topButton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {initPopupWindow(c);}});mListView = new CornerListView(c);mListView.setScrollbarFadingEnabled(false);mListView.setBackgroundResource(R.drawable.shape_bg_listview);mListView.setCacheColorHint(0);mListView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {Object obj = parent.getItemAtPosition(position);topButton.setText(obj.toString());dismiss();changListener.onItemSeleted(parent, view, position, id);}});}@SuppressWarnings("deprecation")@SuppressLint("NewApi")protected void initPopupWindow(Context context) {if (popup == null) {popup = new PopupWindow(mContext);popup.setWidth(topButton.getWidth());popup.setBackgroundDrawable(new BitmapDrawable());popup.setFocusable(true);popup.setHeight(500);popup.setOutsideTouchable(true);popup.setContentView(mListView);}if (!popup.isShowing()) {popup.showAsDropDown(topButton);}}protected void dismiss() {if (popup.isShowing()) {popup.dismiss();}}private void setTopText(ListAdapter adapter) {ListAdapter mAdapter = adapter;String text = "";if(mAdapter.getCount() <= 0){text = "select";topButton.setText(text);return;}else if (topButton.getText().toString().equals("")) {text = (String) mAdapter.getItem(0);topButton.setText(text);}text = null;}public void setAdapter(ListAdapter adapter) {if (mListView == null) {throw new NullPointerException("Listview null");}mListView.setAdapter(adapter);setTopText(adapter);}public void setOnItemSeletedListener(OnItemSeletedListener listener) {this.changListener = listener;}public interface OnItemSeletedListener {abstract void onItemSeleted(AdapterView<?> parent, View view,int position, long id);}private final class CornerListView extends ListView {public CornerListView(Context context) {super(context);}public CornerListView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}public CornerListView(Context context, AttributeSet attrs) {super(context, attrs);}@Overridepublic boolean onInterceptTouchEvent(MotionEvent ev) {final int action = ev.getAction();switch (action) {case MotionEvent.ACTION_DOWN:int x = (int) ev.getX();int y = (int) ev.getY();final int itemNum = pointToPosition(x, y);if (itemNum == AbsListView.INVALID_POSITION) {break;} else {if (itemNum == 0) {if (itemNum == (getAdapter().getCount() - 1)) {setSelector(R.drawable.app_list_corner_round);} else {setSelector(R.drawable.app_list_corner_round_top);}} else if (itemNum == (getAdapter().getCount() - 1)) {setSelector(R.drawable.app_list_corner_round_bottom);} else {setSelector(R.drawable.app_list_corner_shape);}}break;}return super.onInterceptTouchEvent(ev);}}@SuppressLint("WrongCall")protected final class ArrowView extends View {private int width;private int height;protected ShapeDrawable shape;public ArrowView(Context context, AttributeSet set, View v) {super(context, set);width = 30;height = 20;Path p = new Path();p.moveTo(0, 0);p.lineTo(width, 0);p.lineTo(width / 2, height);p.lineTo(0, 0);shape = new ShapeDrawable(new PathShape(p, width, height));shape.getPaint().setColor(Color.BLACK);shape.setBounds(0, 0, width, height);}public void setColor(int color) {shape.getPaint().setColor(color);}protected Drawable getDrawable() {Canvas canvas = new Canvas();shape.draw(canvas);this.onDraw(canvas);return shape;}}}