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 set (String valueText, int position) {
 if (position < mToggleButton.size()) {
  mToggleButton.get(position).setText(valueText);
 }
 }
 
 public void set (String  ){
 
 }
 /**
 * 根据选择的位置获取tabitem显示的值
 */
 public String get (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.set Listener(new  Listener() {
  @Override
  public void  (View v) {
   onPressBack();
  }
  });
 
  r.setBackgroundColor(mContext.getResources().getColor(R.color.popup_main_background));
  tButton.set Listener(new  Listener() {
  @Override
  public void  (View view) {
   // initPopupWindow();
   ToggleButton tButton = (ToggleButton) view;
 
   if (selectedButton != null && selectedButton != tButton) {
   selectedButton.setChecked(false);
   }
   selectedButton = tButton;
   selectPosition = (Integer) selectedButton.getTag();
   startAnimation();
   if (mOnButt Listener != null && tButton.isChecked()) {
   mOnButt Listener. (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 View Action) {
  View Action f = (View Action) 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 View Action) {
  View Action f = (View Action) 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 OnButt Listener mOnButt Listener;
 
 /**
 * 设置tabitem的点击监听事件
 */
 public void setOnButt Listener(OnButt Listener l) {
 mOnButt Listener = l;
 }
 
 /**
 * 自定义tabitem点击回调接口
 */
 public interface OnButt Listener {
 public void  (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.set (viewLeft.getShowText(), 0);
// expandTabView.set (viewMiddle.getShowText(), 1);
// expandTabView.set (viewRight.getShowText(), 2);
 
  }
 
  private void initListener() {
 
    viewLeft.set Listener(new ViewLeft. Listener() {
 
      @Override
      public void getValue(String distance, String showText) {
        onRefresh(viewLeft, showText);
      }
    });
 
    viewMiddle.set Listener(new ViewMiddle. Listener() {
 
      @Override
      public void getValue(String showText) {
 
        onRefresh(viewMiddle,showText);
 
      }
    });
 
    viewRight.set Listener(new ViewRight. Listener() {
 
      @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.get (position).equals(showText)) {
      expandTabView.set (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);
  }