无法将 android.app.Fragment 转换为 mapping.SupportMapFragment

Question

我从这里的地图文档中添加了这个行标记，它没有编译

mapFragment = (SupportMapFragment) getFragmentManager().findFragmentById(R.id.supportmapfragmentj);

我得到

cannot cast android.app.Fragment to com.here.android.mpa.mapping.SupportMapFragment

知道我的片段xml如下

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MapGuiTestActivityJ">

<fragment
        class="com.here.android.mpa.mapping.SupportMapFragment"
        android:id="@+id/supportmapfragmentj"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</android.support.constraint.ConstraintLayout>

Answer 1

试试这个：

mapFragment = (SupportMapFragment) rootView.findViewById(R.id.supportmapfragmentj);

其中 rootView 是视图容器，您 return 在 onCreateView()

Answer 2

也许使用 'Support Fragment Manager' 可以解决这个问题

尝试替换

mapFragment = (SupportMapFragment) getFragmentManager().findFragmentById(R.id.supportmapfragmentj);

和

mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.supportmapfragmentj);

无法将 android.app.Fragment 转换为 mapping.SupportMapFragment

cannot cast android.app.Fragment to mapping.SupportMapFragment

java

android

here-api