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Android Google Maps v2 API:无法启动活动nullpointerexception，代码设置正确

android google-maps

Android Google Maps v2 API:无法启动活动nullpointerexception，代码设置正确,android,google-maps,nullpointerexception,google-maps-android-api-2,Android,Google Maps,Nullpointerexception,Google Maps Android Api 2,我读过无数关于android版Google Maps v2 api的NullPointerException线程，似乎没有一个能回答这个问题 对于我的SupportMapFragment，我不断得到NullPointerException。我几乎什么都试过了，现在我束手无策。每次我尝试启动我的应用程序时，它都会崩溃，如果没有为应用程序实现googlemap，它就可以正常工作 我已经检查过Google Play服务是否缺失，不是。它是google play的服务和软件包名称。我已经检查了我的清单，

我读过无数关于android版Google Maps v2 api的
NullPointerException
线程，似乎没有一个能回答这个问题

对于我的
SupportMapFragment
，我不断得到
NullPointerException
。我几乎什么都试过了，现在我束手无策。每次我尝试启动我的应用程序时，它都会崩溃，如果没有为应用程序实现googlemap，它就可以正常工作

我已经检查过Google Play服务是否缺失，不是。它是google play的服务和软件包名称。我已经检查了我的清单，所有的设置都是正确的（显然我没有向你们展示我的Api密钥）。那是什么呢

是因为我扩展了ActionBarActivity而不是FragmentActivity吗？？？据我所知，这不应该造成问题，因为ActionBarActivity是FragmentActivity的扩展

那怎么了？？？我不明白。我什么都试过了

支持MapFragment类
此类中出现的问题

public class GoogleMapFragment extends SupportMapFragment {

private final String TAG = "GoogleMapFragment";

private GoogleMap mMap;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_map, container, false);
    return rootView;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    /*
     * Test to see if GooglePlayServices is available
     */
    if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(getActivity()) == 9) {
        Log.d(TAG, "Service Invalid");
    } 
    if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(getActivity()) == 3) {
        Log.d(TAG, "Service Disabled");
    }

    // Get a handle to the Map Fragment
    setupMapIfNeeded();
}

@Override
public void onResume() {
    super.onResume();
    setupMapIfNeeded();
}

private void setupMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the map.
    if (mMap == null) {
        // Try to obtain the map from the SupportMapFragment.

        mMap = ((SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.mapView))
                .getMap(); // SAYS PROBLEM IS HERE

        // Check if we were successful in obtaining the map.
        if (mMap != null) {
            setUpMap();
        }
    }
}
private void setUpMap() {
    mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
}
}

main活动

public class MainActivity extends ActionBarActivity  {

//Log TAG
private final String TAG = "MainActivity";

private final static String MAP_TAB = "Map";
};

/*
 * Setup fragments
 */
private Fragment mapFragment;

/*
 * onCreate method which will create the action bar and the tabs undeneath
 * action bar
 */
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    /*
     * Setup Fragments
     */
    mapFragment = new GoogleMapFragment();

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }

    /*
     * Setup tabs underneath actionbar
     */
    ActionBar bar = getSupportActionBar();
    bar.setTitle(R.string.app_name);
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    /*
     * declare tabs
     */
    Tab mapTab = bar.newTab();

    /*
     * Set titles
     */
    mapTab.setText(MAP_TAB);

    /*
     * Set Icons for tabs [ADD IN LATER]
     */
    //mapTab.setIcon(icon);

    /*
     * Setup tab listeners
     */
    mapTab.setTabListener(new MyTabListener<GoogleMapFragment>(this, 
            MAP_TAB, GoogleMapFragment.class));

    /*
     * add to bar
     */
    bar.addTab(mapTab);


}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    // Inflate the menu; this adds items to the action bar if it is present.
    inflater.inflate(R.menu.main, menu);
    return super.onCreateOptionsMenu(menu);
}

...

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container,
                false);
        return rootView;
    }
}

/*
 * When app is on pause retain activity
 */
@Override
public void onPause() {
    super.onPause();
}

...
...

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.app"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="11"
    android:targetSdkVersion="19" />

<uses-permission android:name="com.curio.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />

<!-- Prohibit app only to android devices that have cameras and OpenGL ES v.2 -->
<uses-feature
    android:name="android.hardware.camera"
    android:required="true" />
<uses-feature
    android:glEsVersion="0x00020000"
    android:required="true" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.curio.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
    <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="AI......................" />
</application>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.app.MainActivity"
tools:ignore="MergeRootFrame" />

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

06-07 10:28:49.659: E/AndroidRuntime(1944): FATAL EXCEPTION: main
06-07 10:28:49.659: E/AndroidRuntime(1944): Process: com.app, PID: 1944
06-07 10:28:49.659: E/AndroidRuntime(1944): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.app/com.app.MainActivity}: java.lang.NullPointerException
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.os.Handler.dispatchMessage(Handler.java:102)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.os.Looper.loop(Looper.java:136)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.main(ActivityThread.java:5017)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at java.lang.reflect.Method.invokeNative(Native Method)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at java.lang.reflect.Method.invoke(Method.java:515)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at dalvik.system.NativeStart.main(Native Method)
06-07 10:28:49.659: E/AndroidRuntime(1944): Caused by: java.lang.NullPointerException
06-07 10:28:49.659: E/AndroidRuntime(1944):     at com.curio.GoogleMapFragment.setupMapIfNeeded(GoogleMapFragment.java:72)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at com.curio.GoogleMapFragment.onCreate(GoogleMapFragment.java:42)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.Fragment.performCreate(Fragment.java:1477)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:893)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:570)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1171)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.Activity.performStart(Activity.java:5241)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2168)


活动\u main.xml

public class MainActivity extends ActionBarActivity  {

//Log TAG
private final String TAG = "MainActivity";

private final static String MAP_TAB = "Map";
};

/*
 * Setup fragments
 */
private Fragment mapFragment;

/*
 * onCreate method which will create the action bar and the tabs undeneath
 * action bar
 */
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    /*
     * Setup Fragments
     */
    mapFragment = new GoogleMapFragment();

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }

    /*
     * Setup tabs underneath actionbar
     */
    ActionBar bar = getSupportActionBar();
    bar.setTitle(R.string.app_name);
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    /*
     * declare tabs
     */
    Tab mapTab = bar.newTab();

    /*
     * Set titles
     */
    mapTab.setText(MAP_TAB);

    /*
     * Set Icons for tabs [ADD IN LATER]
     */
    //mapTab.setIcon(icon);

    /*
     * Setup tab listeners
     */
    mapTab.setTabListener(new MyTabListener<GoogleMapFragment>(this, 
            MAP_TAB, GoogleMapFragment.class));

    /*
     * add to bar
     */
    bar.addTab(mapTab);


}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    // Inflate the menu; this adds items to the action bar if it is present.
    inflater.inflate(R.menu.main, menu);
    return super.onCreateOptionsMenu(menu);
}

...

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container,
                false);
        return rootView;
    }
}

/*
 * When app is on pause retain activity
 */
@Override
public void onPause() {
    super.onPause();
}

...
...

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.app"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="11"
    android:targetSdkVersion="19" />

<uses-permission android:name="com.curio.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />

<!-- Prohibit app only to android devices that have cameras and OpenGL ES v.2 -->
<uses-feature
    android:name="android.hardware.camera"
    android:required="true" />
<uses-feature
    android:glEsVersion="0x00020000"
    android:required="true" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.curio.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
    <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="AI......................" />
</application>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.app.MainActivity"
tools:ignore="MergeRootFrame" />

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

06-07 10:28:49.659: E/AndroidRuntime(1944): FATAL EXCEPTION: main
06-07 10:28:49.659: E/AndroidRuntime(1944): Process: com.app, PID: 1944
06-07 10:28:49.659: E/AndroidRuntime(1944): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.app/com.app.MainActivity}: java.lang.NullPointerException
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.os.Handler.dispatchMessage(Handler.java:102)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.os.Looper.loop(Looper.java:136)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.main(ActivityThread.java:5017)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at java.lang.reflect.Method.invokeNative(Native Method)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at java.lang.reflect.Method.invoke(Method.java:515)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at dalvik.system.NativeStart.main(Native Method)
06-07 10:28:49.659: E/AndroidRuntime(1944): Caused by: java.lang.NullPointerException
06-07 10:28:49.659: E/AndroidRuntime(1944):     at com.curio.GoogleMapFragment.setupMapIfNeeded(GoogleMapFragment.java:72)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at com.curio.GoogleMapFragment.onCreate(GoogleMapFragment.java:42)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.Fragment.performCreate(Fragment.java:1477)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:893)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:570)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1171)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.Activity.performStart(Activity.java:5241)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2168)

LogCat

public class MainActivity extends ActionBarActivity  {

//Log TAG
private final String TAG = "MainActivity";

private final static String MAP_TAB = "Map";
};

/*
 * Setup fragments
 */
private Fragment mapFragment;

/*
 * onCreate method which will create the action bar and the tabs undeneath
 * action bar
 */
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    /*
     * Setup Fragments
     */
    mapFragment = new GoogleMapFragment();

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }

    /*
     * Setup tabs underneath actionbar
     */
    ActionBar bar = getSupportActionBar();
    bar.setTitle(R.string.app_name);
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    /*
     * declare tabs
     */
    Tab mapTab = bar.newTab();

    /*
     * Set titles
     */
    mapTab.setText(MAP_TAB);

    /*
     * Set Icons for tabs [ADD IN LATER]
     */
    //mapTab.setIcon(icon);

    /*
     * Setup tab listeners
     */
    mapTab.setTabListener(new MyTabListener<GoogleMapFragment>(this, 
            MAP_TAB, GoogleMapFragment.class));

    /*
     * add to bar
     */
    bar.addTab(mapTab);


}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    // Inflate the menu; this adds items to the action bar if it is present.
    inflater.inflate(R.menu.main, menu);
    return super.onCreateOptionsMenu(menu);
}

...

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container,
                false);
        return rootView;
    }
}

/*
 * When app is on pause retain activity
 */
@Override
public void onPause() {
    super.onPause();
}

...
...

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.app"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="11"
    android:targetSdkVersion="19" />

<uses-permission android:name="com.curio.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />

<!-- Prohibit app only to android devices that have cameras and OpenGL ES v.2 -->
<uses-feature
    android:name="android.hardware.camera"
    android:required="true" />
<uses-feature
    android:glEsVersion="0x00020000"
    android:required="true" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.curio.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
    <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="AI......................" />
</application>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.app.MainActivity"
tools:ignore="MergeRootFrame" />

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

06-07 10:28:49.659: E/AndroidRuntime(1944): FATAL EXCEPTION: main
06-07 10:28:49.659: E/AndroidRuntime(1944): Process: com.app, PID: 1944
06-07 10:28:49.659: E/AndroidRuntime(1944): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.app/com.app.MainActivity}: java.lang.NullPointerException
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.os.Handler.dispatchMessage(Handler.java:102)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.os.Looper.loop(Looper.java:136)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.main(ActivityThread.java:5017)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at java.lang.reflect.Method.invokeNative(Native Method)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at java.lang.reflect.Method.invoke(Method.java:515)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at dalvik.system.NativeStart.main(Native Method)
06-07 10:28:49.659: E/AndroidRuntime(1944): Caused by: java.lang.NullPointerException
06-07 10:28:49.659: E/AndroidRuntime(1944):     at com.curio.GoogleMapFragment.setupMapIfNeeded(GoogleMapFragment.java:72)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at com.curio.GoogleMapFragment.onCreate(GoogleMapFragment.java:42)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.Fragment.performCreate(Fragment.java:1477)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:893)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:570)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1171)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.Activity.performStart(Activity.java:5241)
06-07 10:28:49.659: E/AndroidRuntime(1944):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2168)
这解决了我的问题：

我只是忘了调用
super.onCreateView（）

您嵌套在Fragmet扩展类中。我不太确定，但您只能嵌套扩展片段的类，而不能嵌套在xml中，就像您在错误的布局文件中添加了视图一样。您真的在使用占位符片段吗？或者您在创建项目并自动添加ecllipse时没有研究它？？您可以在片段扩展类中详细说明吗。你是说我的内心世界吗。“是”占位符是自动生成的。查看此帖子检查，我还添加了我的activity_main.xml