請(qǐng)問我這個(gè)PopupWindow怎么在這個(gè)底部凸起圖片上面彈出?我這樣寫始終不行

想實(shí)現(xiàn)的效果:

布局:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipChildren="false"
tools:context="com.demaxiya.activity.MainActivity">

<RadioGroup
    android:id="@+id/rg_tabs"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:background="#11000000"
    android:clipChildren="true"
    android:orientation="horizontal">

    <RadioButton
        android:id="@+id/rb_home"
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:layout_weight="1"
        android:button="@null"
        android:drawableTop="@drawable/home_button_selector"
        android:gravity="center"
        android:paddingTop="5dp"
        android:text="首頁"
        android:textColor="@drawable/main_radiobutton_text_color_selector" />

    <RadioButton
        android:id="@+id/rb_channel"
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:layout_weight="1"
        android:button="@null"
        android:drawableTop="@drawable/channel_button_selector"
        android:gravity="center"
        android:paddingTop="5dp"
        android:text="頻道"
        android:textColor="@drawable/main_radiobutton_text_color_selector" />

    <View
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:layout_gravity="bottom"
        android:layout_weight="1" />

    <RadioButton
        android:id="@+id/rb_discovery"
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:layout_weight="1"
        android:button="@null"
        android:drawableTop="@drawable/discovery_button_selector"
        android:gravity="center"
        android:paddingTop="5dp"
        android:text="發(fā)現(xiàn)"
        android:textColor="@drawable/main_radiobutton_text_color_selector" />

    <RadioButton
        android:id="@+id/rb_mine"
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:layout_weight="1"
        android:button="@null"
        android:drawableTop="@drawable/mine_button_selector"
        android:gravity="center"
        android:paddingTop="5dp"
        android:text="我的"
        android:textColor="@drawable/main_radiobutton_text_color_selector" />

</RadioGroup>

<FrameLayout
    android:id="@+id/fl_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_above="@id/rg_tabs">

</FrameLayout>

<ImageView<!--凸起的圖片-->
    android:id="@+id/iv_switch_game_normal"
    android:layout_width="wrap_content"
    android:layout_height="70dp"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:src="@mipmap/radiobutton_switch_game_normal" />

</RelativeLayout>
代碼:
View typeWindow = LayoutInflater.from(MainActivity.this).inflate(R.layout.window_type, null);

    mPopupWindow = new PopupWindow(typeWindow, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
    mPopupWindow.setBackgroundDrawable(new BitmapDrawable());     //點(diǎn)擊空白處popupwindow消失
    mPopupWindow.setFocusable(true);
    //TODO:彈出window顯示在底部button上面
    int[] location = new int[2];
    mSwitchGameNormal.getLocationOnScreen(location);//mSwitchGameNormal為凸起的圖片
    mPopupWindow.showAtLocation(mSwitchGameNormal, Gravity.NO_GRAVITY, location[0], location[1]-mPopupWindow.getHeight());
    mPopupWindow.showAtLocation(MainActivity.this.findViewById(R.id.main), Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, 0); //popupwindow彈出的位置
    WindowManager.LayoutParams lpType = getWindow().getAttributes(); // 設(shè)置背景顏色變暗
    lpType.alpha = 0.7f;
    getWindow().setAttributes(lpType);
    mPopupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
        @Override
        public void onDismiss() {
            WindowManager.LayoutParams lp = getWindow().getAttributes();
            lp.alpha = 1f;
            getWindow().setAttributes(lp);
        }
    });