Android实现简单下拉筛选框

public class ExpandTabView extends LinearLayout implements OnDismissListener {
 private ToggleButton selectedButton;
 private ArrayList<String> mTextArray = new ArrayList<String>();
 private ArrayList<RelativeLayout> mViewArray = new ArrayList<RelativeLayout>();
 private ArrayList<ToggleButton> mToggleButton = new ArrayList<ToggleButton>();
 private Context mContext;
 private final int SMALL = 0;
 private int displayWidth;
 private int displayHeight;
 private PopupWindow popupWindow;
 private int selectPosition;
 public ExpandTabView(Context context) {
 super(context);
 init(context);
 }
 public ExpandTabView(Context context, AttributeSet attrs) {
 super(context, attrs);
 init(context);
 }
 /**
 * 根据选择的位置设置tabitem显示的值
 */
 public void setTitle(String valueText, int position) {
 if (position < mToggleButton.size()) {
 mToggleButton.get(position).setText(valueText);
 }
 }
 public void setTitle(String title){
 }
 /**
 * 根据选择的位置获取tabitem显示的值
 */
 public String getTitle(int position) {
 if (position < mToggleButton.size() && mToggleButton.get(position).getText() != null) {
 return mToggleButton.get(position).getText().toString();
 }
 return "";
 }
 /**
 * 设置tabitem的个数和初始值
 */
 public void setValue(ArrayList<String> textArray, ArrayList<View> viewArray) {
 if (mContext == null) {
 return;
 }
 LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
 mTextArray = textArray;
 for (int i = 0; i < viewArray.size(); i++) {
 final RelativeLayout r = new RelativeLayout(mContext);
 int maxHeight = (int) (displayHeight * 0.7);
 RelativeLayout.LayoutParams rl = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, maxHeight);
 rl.leftMargin = 10;
 rl.rightMargin = 10;
 r.addView(viewArray.get(i), rl);
 mViewArray.add(r);
 r.setTag(SMALL);
 ToggleButton tButton = (ToggleButton) inflater.inflate(R.layout.toggle_button, this, false);
 addView(tButton);
 View line = new TextView(mContext);
 line.setBackgroundResource(R.drawable.choosebar_line);
 if (i < viewArray.size() - 1) {
 LayoutParams lp = new LayoutParams(2, LayoutParams.FILL_PARENT);
 addView(line, lp);
 }
 mToggleButton.add(tButton);
 tButton.setTag(i);
 tButton.setText(mTextArray.get(i));
 r.setOnClickListener(new OnClickListener() {
 @Override
 public void onClick(View v) {
  onPressBack();
 }
 });
 r.setBackgroundColor(mContext.getResources().getColor(R.color.popup_main_background));
 tButton.setOnClickListener(new OnClickListener() {
 @Override
 public void onClick(View view) {
  // initPopupWindow();
  ToggleButton tButton = (ToggleButton) view;
  if (selectedButton != null && selectedButton != tButton) {
  selectedButton.setChecked(false);
  }
  selectedButton = tButton;
  selectPosition = (Integer) selectedButton.getTag();
  startAnimation();
  if (mOnButtonClickListener != null && tButton.isChecked()) {
  mOnButtonClickListener.onClick(selectPosition);
  }
 }
 });
 }
 }
 private void startAnimation() {
 if (popupWindow == null) {
 popupWindow = new PopupWindow(mViewArray.get(selectPosition), displayWidth, displayHeight);
 popupWindow.setAnimationStyle(R.style.PopupWindowAnimation);
 popupWindow.setFocusable(false);
 popupWindow.setOutsideTouchable(true);
 }
 if (selectedButton.isChecked()) {
 if (!popupWindow.isShowing()) {
 showPopup(selectPosition);
 } else {
 popupWindow.setOnDismissListener(this);
 popupWindow.dismiss();
 hideView();
 }
 } else {
 if (popupWindow.isShowing()) {
 popupWindow.dismiss();
 hideView();
 }
 }
 }
 private void showPopup(int position) {
 View tView = mViewArray.get(selectPosition).getChildAt(0);
 if (tView instanceof ViewBaseAction) {
 ViewBaseAction f = (ViewBaseAction) tView;
 f.show();
 }
 if (popupWindow.getContentView() != mViewArray.get(position)) {
 popupWindow.setContentView(mViewArray.get(position));
 }
 popupWindow.showAsDropDown(this, 0, 0);
 }
 /**
 * 如果菜单成展开状态，则让菜单收回去
 */
 public boolean onPressBack() {
 if (popupWindow != null && popupWindow.isShowing()) {
 popupWindow.dismiss();
 hideView();
 if (selectedButton != null) {
 selectedButton.setChecked(false);
 }
 return true;
 } else {
 return false;
 }
 }
 private void hideView() {
 View tView = mViewArray.get(selectPosition).getChildAt(0);
 if (tView instanceof ViewBaseAction) {
 ViewBaseAction f = (ViewBaseAction) tView;
 f.hide();
 }
 }
 private void init(Context context) {
 mContext = context;
 displayWidth = ((Activity) mContext).getWindowManager().getDefaultDisplay().getWidth();
 displayHeight = ((Activity) mContext).getWindowManager().getDefaultDisplay().getHeight();
 setOrientation(LinearLayout.HORIZONTAL);
 }
 @Override
 public void onDismiss() {
 showPopup(selectPosition);
 popupWindow.setOnDismissListener(null);
 }
 private OnButtonClickListener mOnButtonClickListener;
 /**
 * 设置tabitem的点击监听事件
 */
 public void setOnButtonClickListener(OnButtonClickListener l) {
 mOnButtonClickListener = l;
 }
 /**
 * 自定义tabitem点击回调接口
 */
 public interface OnButtonClickListener {
 public void onClick(int selectPosition);
 }
}

public class MainActivity extends AppCompatActivity {
 private ExpandTabView expandTabView;
 private ArrayList<View> mViewArray = new ArrayList<View>();
 private ViewLeft viewLeft;
 private ViewMiddle viewMiddle;
 private ViewRight viewRight;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  initView();
  initVaule();
  initListener();
 }
 private void initView() {
  expandTabView = (ExpandTabView) findViewById(R.id.expandtab_view);
  viewLeft = new ViewLeft(this);
  viewMiddle = new ViewMiddle(this);
  viewRight = new ViewRight(this);
 }
 private void initVaule() {
  mViewArray.add(viewMiddle);
 mViewArray.add(viewLeft);
 mViewArray.add(viewRight);
  ArrayList<String> mTextArray = new ArrayList<String>();
  mTextArray.add("区域");
 mTextArray.add("距离");
 mTextArray.add("距离");
  expandTabView.setValue(mTextArray, mViewArray);
// expandTabView.setTitle(viewLeft.getShowText(), 0);
// expandTabView.setTitle(viewMiddle.getShowText(), 1);
// expandTabView.setTitle(viewRight.getShowText(), 2);
 }
 private void initListener() {
  viewLeft.setOnSelectListener(new ViewLeft.OnSelectListener() {
   @Override
   public void getValue(String distance, String showText) {
    onRefresh(viewLeft, showText);
   }
  });
  viewMiddle.setOnSelectListener(new ViewMiddle.OnSelectListener() {
   @Override
   public void getValue(String showText) {
    onRefresh(viewMiddle,showText);
   }
  });
  viewRight.setOnSelectListener(new ViewRight.OnSelectListener() {
   @Override
   public void getValue(String distance, String showText) {
    onRefresh(viewRight, showText);
   }
  });
 }
 private void onRefresh(View view, String showText) {
  expandTabView.onPressBack();
  int position = getPositon(view);
  if (position >= 0 && !expandTabView.getTitle(position).equals(showText)) {
   expandTabView.setTitle(showText, position);
  }
//  Toast.makeText(MainActivity.this, showText, Toast.LENGTH_SHORT).show();
 }
 private int getPositon(View tView) {
  for (int i = 0; i < mViewArray.size(); i++) {
   if (mViewArray.get(i) == tView) {
    return i;
   }
  }
  return -1;
 }
 @Override
 public void onBackPressed() {
  if (!expandTabView.onPressBack()) {
   finish();
  }
 }
}

@Override
 public void showAsDropDown(View anchor, int xoff, int yoff) {
  if(Build.VERSION.SDK_INT >= 24) {
   Rect rect = new Rect();
   anchor.getGlobalVisibleRect(rect);
   int h = anchor.getResources().getDisplayMetrics().heightPixels - rect.bottom;
   setHeight(h);
  }
  super.showAsDropDown(anchor, xoff, yoff);
 }