一般现在很多地址选择器都是仿苹果，三级联动的地址选择器，但给人的感觉缺少点Android精神。为什么不用Popupwindow来展示呢！以前写pop要写很多东西在Activity中，而其他地方要用，又得写重复的，就算复制过来，也会加深当前页面的复杂度！所以这里打算把其提取出来！

首先我们要写个工具类：(里面包含了popwindow布局初始化，数据填充，打开和关闭，背景透明度变化等！)

public class PopBankUtils {    /**     * 初始化银行卡选择器     */    PopupWindow popBank;    int screenHeight;    int popHeight;    PopBankListAdapter bankListAdapter;    private Activity mContext;    String bank_id="0";    onBankSelectListener listener;    public interface onBankSelectListener{        void bankSelect(String bank_id);    }    public void setListener(onBankSelectListener listener) {        this.listener = listener;    }    public PopBankUtils(Activity context, List bankPopList, final TextView tvBankName) {        if (bankPopList == null||bankPopList.size()==0) return;        this.mContext = context;        int screenWidth = ScreenUtils.getScreenWidth(mContext);        screenHeight = ScreenUtils.getScreenHeight(mContext);        View view = LayoutInflater.from(mContext).inflate(R.layout.pop_bank_select_list_layout, null);        popBank = new PopupWindow(view, screenWidth, screenHeight, true);        popHeight = popBank.getContentView().getMeasuredHeight();        popBank.setAnimationStyle(R.style.AnimRightInLeftOut);        popBank.setBackgroundDrawable(new ColorDrawable(0));        popBank.setOutsideTouchable(true);        popBank.setOnDismissListener(new poponDismissListener());        //设置退款原因数据        RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);        bankListAdapter = new PopBankListAdapter();        recyclerView.setLayoutManager(new LinearLayoutManager(mContext));        recyclerView.setAdapter(bankListAdapter);        bankListAdapter.setNewData(bankPopList);        bankListAdapter.setOnItemClickListener(new BaseQuickAdapter.OnItemClickListener() {            @Override            public void onItemClick(BaseQuickAdapter adapter, View view, int position) {                bankListAdapter.setSelectItem(position);                Bank item = (Bank) adapter.getItem(position);                bank_id = item.getId();                tvBankName.setText(item.getName());                closepopBank();            }        });        TextView tvTitle=(TextView) view.findViewById(R.id.tv_title);        tvTitle.setText("选择银行卡");        //关闭pop        ImageView btnClose = (ImageView) view.findViewById(R.id.iv_back);        btnClose.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                closepopBank();            }        });        //设置popwindow的       for (int i = 0; i < bankPopList.size(); i++) {            Bank bank = bankPopList.get(i);            if (bank.getId().equals(bank_id))bankListAdapter.setSelectItem(i);        }    }    class poponDismissListener implements PopupWindow.OnDismissListener {        @Override        public void onDismiss() {            ScreenUtils.setWindowBackgroundAlpha(mContext, 1f);        }    }    public void openPopBank(){        if (popBank==null){            ToastUtil.showLong("没有银行可供选择！");            return;        }        popBank.showAtLocation(mContext.getWindow().getDecorView(), Gravity.NO_GRAVITY, 0, 0);        if (popBank.isShowing()) {            ScreenUtils.setWindowBackgroundAlpha(mContext,0.5f);        } else {            ScreenUtils.setWindowBackgroundAlpha(mContext, 1f);        }    }    private void closepopBank() {        if (null != popBank && popBank.isShowing()){            popBank.dismiss();            listener.bankSelect(bank_id);        }    }}

每个人的pop布局都不一样，这里我的是这样的：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:orientation="vertical"              android:background="@color/white"              android:layout_width="match_parent"              android:layout_height="match_parent">   <include layout="@layout/common_top_bar"/>    <android.support.v7.widget.RecyclerView        android:id="@+id/recycler_view"        android:layout_weight="1"        android:layout_width="match_parent"        android:layout_height="0dp"/>    <Button        android:id="@+id/btn_close"        android:background="@color/textYellow"        android:textSize="18sp"        android:textColor="@color/white"        android:text=""        android:visibility="invisible"        android:layout_width="match_parent"        android:layout_height="48dp"/>LinearLayout>

上面还用到了动画：

popBank.setAnimationStyle(R.style.AnimRightInLeftOut);

<style name="AnimRightInLeftOut">        <item name="android:windowEnterAnimation">@anim/right_initem>        <item name="android:windowExitAnimation">@anim/left_outitem>style>

其中right_in.xml为：

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" > <translate        android:duration="300"        android:fromXDelta="0%"        android:fromYDelta="0%"        android:toXDelta="100%"        android:toYDelta="0%"/>set>

其中left_out.xml为：

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" ><translate    android:duration="300"    android:fromXDelta="0%"    android:fromYDelta="0%"    android:toXDelta="100%"    android:toYDelta="0%"/>set>

在Activity中使用的时候首先通过接口拿到银行卡列表数据，包含了id和name。填充到PopBankUtils中

  PopBankUtils popBankUtils = new PopBankUtils(MerchatRegistrationActivity.this, banks, tvBankName);                    popBankUtils.setListener(new PopBankUtils.onBankSelectListener() {                        @Override                        public void bankSelect(String bank_id) {                            bankId= bank_id;                        }                    });

然后通过点击控件触发：

popBankUtils.openPopBank();

这样就拿到了银行卡id，并把银行名称填充到了控件中,不仅大大减少了Activity复杂度，而且其他页面要用可以复用！最后效果图：

到这里就结束啦.

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