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嗨，我是想实现谷歌的教程这里后，谷歌地图在我的Android应用程序（Android Studio中）： https://developers.google.com/maps/documentation/android-api/map#mapfragment的Android实现谷歌地图与片段
这是我的布局文件（我已经加入谷歌游戏服务和API密钥，似乎有关于这个没有错误）
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/background1000px"
android:paddingBottom="0dp"
android:paddingLeft="0dp"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.zuercher.zuerchertechnik.Display_product">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/box400x50"
android:id="@+id/title"
android:layout_marginLeft="@dimen/activity_horizontal_margin"
android:adjustViewBounds="true"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="false"
android:layout_alignParentRight="false"
android:text="@string/kontakt"
android:padding="10dp"
android:textColor="@color/black"
android:textSize="24sp"
android:paddingTop="5dp"
/>
<fragment
class="com.google.android.gms.maps.MapFragment"
android:id="@+id/map2"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
这里是为活动我java代码：
package com.zuercher.zuerchertechnik;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMapOptions;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
public class Display_contact extends FragmentActivity implements OnMapReadyCallback {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_contact);
MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.map2);
mapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
}
}
我总是得到almose着名的空指针异常，并且真的尝试了很多不同的组合，但是我在这里变得绝望......（出乎意料的是，在google教程中根本没有帮助......） 我是什么在这里失踪？
感谢
新添加的堆栈跟踪代码
FATAL EXCEPTION: main
Process: com.zuercher.zuerchertechnik, PID: 19745
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.zuercher.zuerchertechnik/com.zuercher.zuerchertechnik.Display_contact}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.MapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2656)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2721)
at android.app.ActivityThread.access$900(ActivityThread.java:168)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5753)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.MapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)' on a null object reference
at com.zuercher.zuerchertechnik.Display_contact.onCreate(Display_contact.java:41)
at android.app.Activity.performCreate(Activity.java:6112)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1117)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2609)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2721)
at android.app.ActivityThread.access$900(ActivityThread.java:168)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5753)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
你能否粘贴你的'NullPointerException'堆栈跟踪呢？ – StuStirling
已添加，对于页面组织中的糟糕对不起，但它只是'跳'到正确的。 – nightslit