Android 实现抖音头像底部弹框效果的实例代码

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.constraintlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  xmlns:app="http://schemas.android.com/apk/res-auto">



  <linearlayout
    android:id="@+id/linearlayout"
    android:orientation="vertical"
    app:layout_constraintstart_tostartof="parent"
    app:layout_constraintbottom_tobottomof="parent"
    android:background="@color/coloraccent"
    android:layout_width="match_parent"
    android:layout_height="300dp">
  </linearlayout>
  <view
    android:layout_width="match_parent"
    android:layout_height="100dp"
    app:layout_constrainttop_totopof="@+id/linearlayout"
    app:layout_constraintbottom_totopof="@+id/linearlayout"
    app:layout_constraintstart_tostartof="parent"
    app:layout_constraintend_toendof="parent"
    android:alpha="0"
    android:background="@android:color/white"
    />
  <imageview
    android:id="@+id/image"
    android:src="@mipmap/ic_launcher"
    app:layout_constrainttop_totopof="@+id/linearlayout"
    app:layout_constraintbottom_totopof="@+id/linearlayout"
    app:layout_constraintstart_tostartof="parent"
    app:layout_constraintend_toendof="parent"
    android:layout_margintop="100dp"
    android:layout_width="100dp"
    android:layout_height="100dp"/>
</androidx.constraintlayout.widget.constraintlayout>

view contentview = layoutinflater.from(mainactivity.this).inflate(r.layout.activity_test, null);
        popupwindow popwnd = new popupwindow(mainactivity.this);
        popwnd.setcontentview(contentview);
        popwnd.setwidth(viewgroup.layoutparams.match_parent);
        popwnd.setheight(viewgroup.layoutparams.wrap_content);
        popwnd.setbackgrounddrawable(new colordrawable(0x00000000));
        popwnd.setoutsidetouchable(false);
        popwnd.setfocusable(true);
        //相对于父控件的底部显示 无任何偏移
        popwnd.showatlocation(v, gravity.bottom, 0, 0);