最近接到一個新的項目，項目時間比較緊張，有一個功能類似于58同城,京東的一個下拉篩選框，為了節省時間，從網上面拷貝了一份封裝好的代碼，進行的自己的一些修改，感覺靈活性還挺高的，分享出來給大家看一看
大致效果如下，可以自己加入自己的布局
先看一下這個ExpandTabView這個類 代碼比較簡單 我就不做具體介紹了 有不懂的可以私信我
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); } /** * 根據選擇的位置設置tabitem顯示的值 */ public void setTitle(String valueText, int position) { if (position < mToggleButton.size()) { mToggleButton.get(position).setText(valueText); } } public void setTitle(String title){ } /** * 根據選擇的位置獲取tabitem顯示的值 */ public String getTitle(int position) { if (position < mToggleButton.size() && mToggleButton.get(position).getText() != null) { return mToggleButton.get(position).getText().toString(); } return ""; } /** * 設置tabitem的個數和初始值 */ 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); } /** * 如果菜單成展開狀態，則讓菜單收回去 */ 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; /** * 設置tabitem的點擊監聽事件 */ public void setOnButtonClickListener(OnButtonClickListener l) { mOnButtonClickListener = l; } /** * 自定義tabitem點擊回調接口 */ public interface OnButtonClickListener { public void onClick(int selectPosition); } }這個代碼基本就是對popupwindow進行了封裝，通過對ToggleButton按鈕的監聽來實現popupwindow的彈出和收回。
外部設置的話，也特別簡單，只需要將自己定義好的布局傳入到list集合中就可以。
下面是MainActivity中的代碼
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("區域"); mTextArray.add("距離"); mTextArray.add("距離"); 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(); } } }以上就是這個篩選菜單欄的大致用法，個人感覺還是比較簡單的，也比較靈活,修改起來也比較方便。
但是在項目中使用的時候碰到了一個問題，就是popupwindow在7.0的手機上彈出位置異常的問題,，查了一下，是因為手機狀態欄高度的問題
于是重寫了一下popupwindow的showAsDropDown方法就解決了，下面是具體代碼
@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); }通過對SDK版本來進行判斷，大于24的話就執行這個方法，解決了popupwindow在7.0手機上異常彈出的問題。
最后附上Demo地址
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VEVB武林網。
新聞熱點
疑難解答
