popupwindow彈出時從下往上，隱藏時從上往下，並且顯示在指定控制元件上方

View inflate = LayoutInflater.from(getContext()).inflate(R.layout.popupwindow_shop, null);
                LinearLayout pop_del = inflate.findViewById(R.id.pop_shop_delete);
                ListView lst = inflate.findViewById(R.id.pop_shop_lst);

                window = new PopupWindow(inflate, LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT, true);
                window.setAnimationStyle(R.style.pop_shop_anim);
                // 例項化一個ColorDrawable顏色為半透明
                ColorDrawable dw = new ColorDrawable(0xb0000000);
                window.setBackgroundDrawable(dw);

                window.setOutsideTouchable(true);
                showUp(inflate);
                window.update();
 

private void showUp(View v) {
        v.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
        int measuredHeight = v.getMeasuredHeight();
        int[] location = new int[2];
        linear.getLocationOnScreen(location);
        window.showAtLocation(linear, Gravity.NO_GRAVITY, 0, location[1] - measuredHeight);
    }
 

<?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:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#bfbfbf"
        android:orientation="horizontal">

        <LinearLayout
            android:id="@+id/pop_shop_delete"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="@dimen/px10_dp"
            android:layout_marginLeft="@dimen/px20_dp"
            android:layout_marginTop="@dimen/px10_dp"
            android:orientation="horizontal">

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:layout_marginRight="@dimen/px10_dp"
                android:src="@drawable/lajixiang" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/qingkong"
                android:textSize="@dimen/px20_sp"
                android:textColor="#000000"/>
        </LinearLayout>
    </LinearLayout>

    <ListView
        android:id="@+id/pop_shop_lst"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"></ListView>
</LinearLayout>
 

動畫：（在res下建立名為anim的資料夾，在anim資料夾下建立檔案）

pop_show

        當值設定為"50"時，表示使用絕對位置定位

        當值設定為"50%"時，表示使用相對於控制元件本身的一半定位

        當值設定為"50%P"時，表示使用相對於父控制元件的一半定位

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="1000"
        android:fromYDelta="100%p"
        android:toYDelta="0" />

    <alpha
        android:duration="1000"
        android:fromAlpha="0.0"
        android:toAlpha="1.0" />
</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="1000"
        android:fromYDelta="0"
        android:toYDelta="50%p" />

    <alpha
        android:duration="1000"
        android:fromAlpha="1.0"
        android:toAlpha="0.0" />
</set>

在values-styles下新增

<style name="pop_shop_anim">
        <!-- 顯示 -->
        <item name="android:windowEnterAnimation">@anim/pop_show</item>
        <!-- 消失 -->
        <item name="android:windowExitAnimation">@anim/pop_hidden</item>
    </style>