使用Androidx / Android Studio 3.5.3构建附近的地方应用时出错

Question

创建应用程序时，我在Logcat中收到以下错误：

2020-01-27 16:45:34.247 20798-20798/com.example.mtcloseby E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.mtcloseby, PID: 20798
    java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.GoogleMap.clear()' on a null object reference
        at com.example.mtcloseby.MapsActivity.nearByPlace(MapsActivity.java:111)
        at com.example.mtcloseby.MapsActivity.access$000(MapsActivity.java:40)
        at com.example.mtcloseby.MapsActivity$1.onNavigationItemSelected(MapsActivity.java:89)
        at com.google.android.material.bottomnavigation.BottomNavigationView$1.onMenuItemSelected(BottomNavigationView.java:243)
        at androidx.appcompat.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:840)
        at androidx.appcompat.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:158)
        at androidx.appcompat.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:991)
        at com.google.android.material.bottomnavigation.BottomNavigationMenuView$1.onClick(BottomNavigationMenuView.java:127)
        at android.view.View.performClick(View.java:6313)
        at android.view.View$PerformClick.run(View.java:24933)
        at android.os.Handler.handleCallback(Handler.java:790)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:175)
        at android.app.ActivityThread.main(ActivityThread.java:6724)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:810)

Answer 1

我已经设法解决它，问题是我正在使用SupportMapFragment，应该是MapFragment