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);