?不廢話，需求：做一個好看的省，市，區三級聯動的選擇器，怎么辦？

需要WheelView基礎控件自行擴展實現邏輯，可直接添加基礎控件庫，Gradle 依賴：

compile 'com.contrarywind:wheelview:4.0.9'

布局：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="vertical"><includelayout="@layout/include_pickerview_topbar"android:layout_width="match_parent"android:layout_height="@dimen/pickerview_topbar_height" /><LinearLayoutandroid:id="@+id/optionspicker"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="@android:color/white"android:orientation="horizontal"><com.contrarywind.view.WheelViewandroid:id="@+id/options1"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1" /><com.contrarywind.view.WheelViewandroid:id="@+id/options2"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1" /><com.contrarywind.view.WheelViewandroid:id="@+id/options3"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1" /></LinearLayout></LinearLayout>

初始化PopWindow:

private void initPopwindow() {popupWindow = new PopupWindow(this);LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);View mMenuView = inflater.inflate(R.layout.my_pickerview_options, null);Button btnCancel, btnSubmit;options1 = mMenuView.findViewById(R.id.options1);options2 = mMenuView.findViewById(R.id.options2);options3 = mMenuView.findViewById(R.id.options3);btnCancel = mMenuView.findViewById(R.id.btnCancel);btnSubmit = mMenuView.findViewById(R.id.btnSubmit);btnCancel.setTextColor(ContextCompat.getColor(RegisterShopActivity.this, R.color.colorCancel));btnSubmit.setTextColor(ContextCompat.getColor(RegisterShopActivity.this, R.color.colorSub));btnSubmit.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {String opt1tx = mOptionsItems1.size() > 0 ?mOptionsItems1.get(options1.getCurrentItem()) : "";String opt2tx = mOptionsItems2.size() > 0 ?mOptionsItems2.get(options2.getCurrentItem()) : "";String opt3tx = mOptionsItems3.size() > 0 ?mOptionsItems3.get(options3.getCurrentItem()) : "";String tx = opt1tx + opt2tx + opt3tx;tvShopAddress.setText(tx);tvShopAddress.setTextColor(ContextCompat.getColor(RegisterShopActivity.this, R.color.colorText));isSelectAdress = true;popupWindow.dismiss();}});btnCancel.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {popupWindow.dismiss();}});options1.setCyclic(false);options2.setCyclic(false);options3.setCyclic(false);options1.setDividerColor(Color.BLACK);options2.setDividerColor(Color.BLACK);options3.setDividerColor(Color.BLACK); // options1.setIsOptions(true); // options2.setIsOptions(true); // options3.setIsOptions(true);options1.setAdapter(new ArrayWheelAdapter(mOptionsItems1));options2.setAdapter(new ArrayWheelAdapter(mOptionsItems2));options3.setAdapter(new ArrayWheelAdapter(mOptionsItems3));options1.setTextSize(20);options2.setTextSize(20);options3.setTextSize(20);options1.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(int index) { // Toast.makeText(RegisterShopActivity.this, "" + mOptionsItems1.get(index), Toast.LENGTH_SHORT).show();int province_id = province.get(index).getProvince_id();getCity(province_id + "");}});options2.setOnItemSelectedListener(new OnItemSelectedListener() {@Overridepublic void onItemSelected(int index) { // Toast.makeText(RegisterShopActivity.this, "" + mOptionsItems2.get(index), Toast.LENGTH_SHORT).show();long city_id = city.get(index).getCity_id();getCounty(city_id + "");}});popupWindow.setContentView(mMenuView);popupWindow.setWidth(LinearLayout.LayoutParams.MATCH_PARENT);popupWindow.setHeight(LinearLayout.LayoutParams.WRAP_CONTENT);ColorDrawable dw = new ColorDrawable(0x000000);popupWindow.setBackgroundDrawable(dw);popupWindow.setFocusable(true);popupWindow.setOutsideTouchable(true);popupWindow.setAnimationStyle(R.style.picker_view_slide_anim);// 設置popupWindow取消的點擊事件，即popupWindow消失后，屏幕的透明度，全透明，就回復原狀態popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {@Overridepublic void onDismiss() {WindowUtil.backgroundAlpha(RegisterShopActivity.this, 1f);}});}

?顯示PopWindow:

private void showPopwindow() {popupWindow.showAtLocation(rlBankInfo,Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, 0);WindowUtil.backgroundAlpha(this, 0.4f);llDetailAddress.setVisibility(View.VISIBLE);}

?

設置數據：

activity.options1.setAdapter(new ArrayWheelAdapter(activity.mOptionsItems1));activity.options1.setCurrentItem(0);

這里我的省，市，區的數據都是服務器請求獲取的。獲取省數據時，需要獲取市的數據。獲取市的數據后，需要獲取區的數據。每次滑動省，市時，需要獲取數據。

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總結

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