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我使用 android maps v2 成功构建了一个地图片段，它在我的智能手机上运行良好。现在我插入了我的平板电脑，当我尝试启动地图活动时我得到了一个 NPE。我现在完全一无所知；甚至不知道错误的来源可能是什么。谁能帮忙？谢谢

地图活动的 OnCreate：

FragmentManager myFragmentManager = getSupportFragmentManager();
    SupportMapFragment mySupportMapFragment = (SupportMapFragment)myFragmentManager.findFragmentById(R.id.customer_map_fragment);
    mMap = mySupportMapFragment.getMap();
    mMap.setMyLocationEnabled(true);                 <-- line 103 with the NPE
    mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);

customer_map_activity.xml：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
         android:layout_width="match_parent"
         android:layout_height="match_parent" >
<fragment
        android:id="@+id/customer_map_fragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.SupportMapFragment"/>
</FrameLayout>

日志猫：

08-12 11:08:27.449: E/AndroidRuntime(3562): FATAL EXCEPTION: main
08-12 11:08:27.449: E/AndroidRuntime(3562): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cocus.salesapp/com.cocus.salesapp.TestCustomerMapActivity}: java.lang.NullPointerException
08-12 11:08:27.449: E/AndroidRuntime(3562):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2185)
08-12 11:08:27.449: E/AndroidRuntime(3562):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2210)
08-12 11:08:27.449: E/AndroidRuntime(3562):     at android.app.ActivityThread.access$600(ActivityThread.java:142)
08-12 11:08:27.449: E/AndroidRuntime(3562):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1208)
08-12 11:08:27.449: E/AndroidRuntime(3562):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-12 11:08:27.449: E/AndroidRuntime(3562):     at  android.os.Looper.loop(Looper.java:137)
08-12 11:08:27.449: E/AndroidRuntime(3562):     at android.app.ActivityThread.main(ActivityThread.java:4931)
08-12 11:08:27.449: E/AndroidRuntime(3562):     at java.lang.reflect.Method.invokeNative(Native Method)
08-12 11:08:27.449: E/AndroidRuntime(3562):     at java.lang.reflect.Method.invoke(Method.java:511)
08-12 11:08:27.449: E/AndroidRuntime(3562):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
08-12 11:08:27.449: E/AndroidRuntime(3562):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
08-12 11:08:27.449: E/AndroidRuntime(3562):     at dalvik.system.NativeStart.main(Native Method)
08-12 11:08:27.449: E/AndroidRuntime(3562): Caused by: java.lang.NullPointerException
08-12 11:08:27.449: E/AndroidRuntime(3562):     at com.fghj.salesapp.TestCustomerMapActivity.onCreate(TestCustomerMapActivity.java:103)

编辑： 在手机上它只在纵向上运行。在平板电脑上，它被迫使用横向。

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1 回答 1

1

您可以通过致电了解原因GooglePlayServicesUtil.isGooglePlayServicesAvailable。

它将返回一个 int 值，您可以将其与ConnectionResultconstants进行比较。

于 2013-08-12T09:18:58.270 回答