BubblePopupWindow leftTopWindow = new BubblePopupWindow(MainActivity.this);

View bubbleView = inflater.inflate(R.layout.layout_popup_view, null);

TextView tvContent = (TextView) bubbleView.findViewById(R.id.tvContent);

tvContent.setText("HelloWorld");

leftTopWindow.setBubbleView(bubbleView); // 设置气泡内容

leftTopWindow.show(view, Gravity.BOTTOM, 0); // 显示弹窗

<?xml version="1.0" encoding="utf-8"?>

<com.yuyh.library.BubbleRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    android:id="@+id/brlBackground"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:background="@android:color/transparent"

    app:cornerRadius="10"

    app:halfBaseOfLeg="18dp"

    app:padding="18dp"

    app:shadowColor="#64000000"

    app:strokeWidth="5">

    <!-- add view  -->

</com.yuyh.library.BubbleRelativeLayout>