快速集成：自定义Popup

  /**自定义Popup:START**/
    private PopupWindow mPopupWindow;
    private void initPopup() {
        /*生成popup的视图*/
        View popupWindow = createPopupView();
        /*设置popup的宽度和高度*/
        int width = getResources().getDisplayMetrics().widthPixels;//得到当前显示设备的宽度，单位是像素
        int height = getResources().getDisplayMetrics().heightPixels;//得到当前显示设备的宽度，单位是像素
        if(dataSize>5){
            mPopupWindow = new PopupWindow(popupWindow, 540 * width / 645,1 * height / 2, true);
        }else {
            mPopupWindow = new PopupWindow(popupWindow, 540 * width / 645,WindowManager.LayoutParams.WRAP_CONTENT, true);
        }
        /*配置pop*/
        mPopupWindow.setTouchable(true);
        mPopupWindow.setOutsideTouchable(true);//设置是否点击PopupWindow外退出PopupWindow
        mPopupWindow.setBackgroundDrawable(new BitmapDrawable(getResources(), (Bitmap) null));//设置背景为空Drawable对象，如不设置，则无法退出
        mPopupWindow.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);
        mPopupWindow.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
        /*popup的隐藏监听，恢复主界面亮度*/
        mPopupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
            @Override
            public void onDismiss() {
                WindowManager.LayoutParams params = getWindow().getAttributes();
                params.alpha = 1.0f;
                getWindow().setAttributes(params);
            }
        });
    }
    private void showPopup() {
        /*背景变暗*/
        WindowManager.LayoutParams params = getWindow().getAttributes();//创建当前界面的一个参数对象
        params.alpha = 0.7f;
        getWindow().setAttributes(params);
       /*显示popup*/
        mPopupWindow.showAtLocation(mainView, Gravity.CENTER, 0, 0); //参数：父View对象,重心，x轴偏移量,y轴的偏移量
    }
    private View createPopupView() {
         /*加载视图*/
        View popupWindow = LayoutInflater.from(this).inflate(R.layout.popup_borrowreason, null);
        ListView listview = (ListView) popupWindow.findViewById(R.id.listview);
         /*绑定数据*/
        ArrayList<String> list = getBorrowReason();
        ArrayAdapter<String> adapter;
        adapter= new ArrayAdapter(this,R.layout.item_borrowreason,R.id.textView,list);//使用自定义布局
        listview.setAdapter(adapter);
       /*设置监听*/
        listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                AbToastUtil.showToast(context, "你点击了：popup=" + position);
            }
        });
        return popupWindow;
    }
    int dataSize;
    private ArrayList<String> getBorrowReason() {
        ArrayList<String> list = new ArrayList<String>();
        list.add("没钱买吃的");
        list.add("没钱买喝的");
        list.add("没钱买玩的");
        list.add("没钱买乐的");
        dataSize=list.size();
        return list;
    }
    /**自定义Popup:END**/

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="5dp"
    android:background="@drawable/shape_white_bg04"
    android:orientation="vertical">
    <LinearLayout
        android:background="@drawable/shape_white_bg03"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:id="@+id/tv01"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:text="借款原因"
            android:textColor="#0099FF"
            android:textSize="20dp" />
        <View
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="#cdcdcd" />
        <ListView
            android:listSelector="#ffffff"
            android:scrollbars="none"
            android:id="@+id/listview"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"></ListView>
        <View
            android:layout_width="match_parent"
            android:layout_height="5dp"/>
    </LinearLayout>
</LinearLayout>