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);