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Java 第二次加载google地图片段时，膨胀视图上的空指针

java android google-maps android-fragments

Java 第二次加载google地图片段时，膨胀视图上的空指针,java,android,google-maps,android-fragments,Java,Android,Google Maps,Android Fragments,我正在使用抽屉布局，当我第二次加载google地图片段时，异常将如预期的那样被捕获；然而，当我尝试时，用同样的方法 Button btnShowList = (Button) ui.findViewById(R.id.btnShowList); 我得到一个空指针异常。我想那是因为ui没有被赋值 我该怎么处理 Page2.java: public class Page2 extends Fragment { View ui; final String TAG = "POPE";

我正在使用抽屉布局，当我第二次加载google地图片段时，异常将如预期的那样被捕获；然而，当我尝试时，用同样的方法

Button btnShowList = (Button) ui.findViewById(R.id.btnShowList);
我得到一个空指针异常。我想那是因为
ui
没有被赋值

我该怎么处理

Page2.java:

public class Page2 extends Fragment {

    View ui;
    final String TAG = "POPE";
    final int CODIGO_DE_RESULTADO_1 = 1; // Es para usarlo en onActivityResult();

    private GoogleMap mMap;

    public Page2(){
        // Este es el constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        if (ui != null) {
            ViewGroup parent = (ViewGroup) ui.getParent();
            if (parent != null){
                parent.removeView(ui);
            }
        }

        try {
            ui = inflater.inflate(R.layout.activity_page2,container,false);
        } catch (InflateException e) {
            Log.i(TAG,"HERE COMES THE STACK TRACE");
            e.printStackTrace();
        }

        FragmentManager fm = getFragmentManager();
        mMap = ((MapFragment) fm.findFragmentById(R.id.map)).getMap();
        mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);     
        mMap.setMyLocationEnabled(true);


        Button btnShowList = (Button) ui.findViewById(R.id.btnShowList);
        btnShowList.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                showFileslist();
            }
        });

        return ui;

    }
}

<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">

<fragment
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.MapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<Button
    android:id="@+id/btnShowList"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:text="Load points" />

07-08 22:17:44.203: I/POPE(11859): HERE COMES THE STACK TRACE
07-08 22:17:44.213: W/System.err(11859): android.view.InflateException: Binary XML file line #6: Error inflating class fragment
07-08 22:17:44.213: W/System.err(11859):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:710)
07-08 22:17:44.213: W/System.err(11859):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:752)
07-08 22:17:44.213: W/System.err(11859):    at android.view.LayoutInflater.inflate(LayoutInflater.java:495)
07-08 22:17:44.213: W/System.err(11859):    at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
07-08 22:17:44.213: W/System.err(11859):    at com.jorgeandresserrano.gpstools.Page2.onCreateView(Page2.java:52)
07-08 22:17:44.213: W/System.err(11859):    at android.app.Fragment.performCreateView(Fragment.java:1695)
07-08 22:17:44.213: W/System.err(11859):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:903)
07-08 22:17:44.213: W/System.err(11859):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1075)
07-08 22:17:44.213: W/System.err(11859):    at android.app.BackStackRecord.run(BackStackRecord.java:682)
07-08 22:17:44.213: W/System.err(11859):    at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1455)
07-08 22:17:44.223: W/System.err(11859):    at android.app.FragmentManagerImpl$1.run(FragmentManager.java:441)
07-08 22:17:44.223: W/System.err(11859):    at android.os.Handler.handleCallback(Handler.java:725)
07-08 22:17:44.223: W/System.err(11859):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-08 22:17:44.223: W/System.err(11859):    at android.os.Looper.loop(Looper.java:137)
07-08 22:17:44.223: W/System.err(11859):    at android.app.ActivityThread.main(ActivityThread.java:5293)
07-08 22:17:44.223: W/System.err(11859):    at java.lang.reflect.Method.invokeNative(Native Method)
07-08 22:17:44.223: W/System.err(11859):    at java.lang.reflect.Method.invoke(Method.java:511)
07-08 22:17:44.223: W/System.err(11859):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
07-08 22:17:44.223: W/System.err(11859):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
07-08 22:17:44.223: W/System.err(11859):    at dalvik.system.NativeStart.main(Native Method)
07-08 22:17:44.223: W/System.err(11859): Caused by: java.lang.IllegalArgumentException: Binary XML file line #6: Duplicate id 0x7f05003f, tag null, or parent id 0xffffffff with another fragment for com.google.android.gms.maps.MapFragment
07-08 22:17:44.223: W/System.err(11859):    at android.app.Activity.onCreateView(Activity.java:4863)
07-08 22:17:44.233: W/System.err(11859):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:686)
07-08 22:17:44.233: W/System.err(11859):    ... 19 more
07-08 22:17:44.233: D/AndroidRuntime(11859): Shutting down VM
07-08 22:17:44.233: W/dalvikvm(11859): threadid=1: thread exiting with uncaught exception (group=0x410feac8)
07-08 22:17:44.233: E/AndroidRuntime(11859): FATAL EXCEPTION: main
07-08 22:17:44.233: E/AndroidRuntime(11859): java.lang.NullPointerException
07-08 22:17:44.233: E/AndroidRuntime(11859):    at com.myname.myapp.Page2.onCreateView(Page2.java:66)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.Fragment.performCreateView(Fragment.java:1695)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:903)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1075)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.BackStackRecord.run(BackStackRecord.java:682)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1455)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.FragmentManagerImpl$1.run(FragmentManager.java:441)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.os.Handler.handleCallback(Handler.java:725)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.os.Looper.loop(Looper.java:137)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.ActivityThread.main(ActivityThread.java:5293)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at java.lang.reflect.Method.invokeNative(Native Method)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at java.lang.reflect.Method.invoke(Method.java:511)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at dalvik.system.NativeStart.main(Native Method)

Button btnShowList = (Button) ui.findViewById(R.id.btnShowList);
活动\u page2.xml:

public class Page2 extends Fragment {

    View ui;
    final String TAG = "POPE";
    final int CODIGO_DE_RESULTADO_1 = 1; // Es para usarlo en onActivityResult();

    private GoogleMap mMap;

    public Page2(){
        // Este es el constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        if (ui != null) {
            ViewGroup parent = (ViewGroup) ui.getParent();
            if (parent != null){
                parent.removeView(ui);
            }
        }

        try {
            ui = inflater.inflate(R.layout.activity_page2,container,false);
        } catch (InflateException e) {
            Log.i(TAG,"HERE COMES THE STACK TRACE");
            e.printStackTrace();
        }

        FragmentManager fm = getFragmentManager();
        mMap = ((MapFragment) fm.findFragmentById(R.id.map)).getMap();
        mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);     
        mMap.setMyLocationEnabled(true);


        Button btnShowList = (Button) ui.findViewById(R.id.btnShowList);
        btnShowList.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                showFileslist();
            }
        });

        return ui;

    }
}

<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">

<fragment
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.MapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<Button
    android:id="@+id/btnShowList"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:text="Load points" />

07-08 22:17:44.203: I/POPE(11859): HERE COMES THE STACK TRACE
07-08 22:17:44.213: W/System.err(11859): android.view.InflateException: Binary XML file line #6: Error inflating class fragment
07-08 22:17:44.213: W/System.err(11859):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:710)
07-08 22:17:44.213: W/System.err(11859):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:752)
07-08 22:17:44.213: W/System.err(11859):    at android.view.LayoutInflater.inflate(LayoutInflater.java:495)
07-08 22:17:44.213: W/System.err(11859):    at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
07-08 22:17:44.213: W/System.err(11859):    at com.jorgeandresserrano.gpstools.Page2.onCreateView(Page2.java:52)
07-08 22:17:44.213: W/System.err(11859):    at android.app.Fragment.performCreateView(Fragment.java:1695)
07-08 22:17:44.213: W/System.err(11859):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:903)
07-08 22:17:44.213: W/System.err(11859):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1075)
07-08 22:17:44.213: W/System.err(11859):    at android.app.BackStackRecord.run(BackStackRecord.java:682)
07-08 22:17:44.213: W/System.err(11859):    at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1455)
07-08 22:17:44.223: W/System.err(11859):    at android.app.FragmentManagerImpl$1.run(FragmentManager.java:441)
07-08 22:17:44.223: W/System.err(11859):    at android.os.Handler.handleCallback(Handler.java:725)
07-08 22:17:44.223: W/System.err(11859):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-08 22:17:44.223: W/System.err(11859):    at android.os.Looper.loop(Looper.java:137)
07-08 22:17:44.223: W/System.err(11859):    at android.app.ActivityThread.main(ActivityThread.java:5293)
07-08 22:17:44.223: W/System.err(11859):    at java.lang.reflect.Method.invokeNative(Native Method)
07-08 22:17:44.223: W/System.err(11859):    at java.lang.reflect.Method.invoke(Method.java:511)
07-08 22:17:44.223: W/System.err(11859):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
07-08 22:17:44.223: W/System.err(11859):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
07-08 22:17:44.223: W/System.err(11859):    at dalvik.system.NativeStart.main(Native Method)
07-08 22:17:44.223: W/System.err(11859): Caused by: java.lang.IllegalArgumentException: Binary XML file line #6: Duplicate id 0x7f05003f, tag null, or parent id 0xffffffff with another fragment for com.google.android.gms.maps.MapFragment
07-08 22:17:44.223: W/System.err(11859):    at android.app.Activity.onCreateView(Activity.java:4863)
07-08 22:17:44.233: W/System.err(11859):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:686)
07-08 22:17:44.233: W/System.err(11859):    ... 19 more
07-08 22:17:44.233: D/AndroidRuntime(11859): Shutting down VM
07-08 22:17:44.233: W/dalvikvm(11859): threadid=1: thread exiting with uncaught exception (group=0x410feac8)
07-08 22:17:44.233: E/AndroidRuntime(11859): FATAL EXCEPTION: main
07-08 22:17:44.233: E/AndroidRuntime(11859): java.lang.NullPointerException
07-08 22:17:44.233: E/AndroidRuntime(11859):    at com.myname.myapp.Page2.onCreateView(Page2.java:66)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.Fragment.performCreateView(Fragment.java:1695)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:903)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1075)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.BackStackRecord.run(BackStackRecord.java:682)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1455)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.FragmentManagerImpl$1.run(FragmentManager.java:441)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.os.Handler.handleCallback(Handler.java:725)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.os.Looper.loop(Looper.java:137)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.ActivityThread.main(ActivityThread.java:5293)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at java.lang.reflect.Method.invokeNative(Native Method)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at java.lang.reflect.Method.invoke(Method.java:511)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at dalvik.system.NativeStart.main(Native Method)

Button btnShowList = (Button) ui.findViewById(R.id.btnShowList);
第66行是：

public class Page2 extends Fragment {

    View ui;
    final String TAG = "POPE";
    final int CODIGO_DE_RESULTADO_1 = 1; // Es para usarlo en onActivityResult();

    private GoogleMap mMap;

    public Page2(){
        // Este es el constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        if (ui != null) {
            ViewGroup parent = (ViewGroup) ui.getParent();
            if (parent != null){
                parent.removeView(ui);
            }
        }

        try {
            ui = inflater.inflate(R.layout.activity_page2,container,false);
        } catch (InflateException e) {
            Log.i(TAG,"HERE COMES THE STACK TRACE");
            e.printStackTrace();
        }

        FragmentManager fm = getFragmentManager();
        mMap = ((MapFragment) fm.findFragmentById(R.id.map)).getMap();
        mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);     
        mMap.setMyLocationEnabled(true);


        Button btnShowList = (Button) ui.findViewById(R.id.btnShowList);
        btnShowList.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                showFileslist();
            }
        });

        return ui;

    }
}

<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">

<fragment
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.MapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<Button
    android:id="@+id/btnShowList"
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:text="Load points" />

07-08 22:17:44.203: I/POPE(11859): HERE COMES THE STACK TRACE
07-08 22:17:44.213: W/System.err(11859): android.view.InflateException: Binary XML file line #6: Error inflating class fragment
07-08 22:17:44.213: W/System.err(11859):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:710)
07-08 22:17:44.213: W/System.err(11859):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:752)
07-08 22:17:44.213: W/System.err(11859):    at android.view.LayoutInflater.inflate(LayoutInflater.java:495)
07-08 22:17:44.213: W/System.err(11859):    at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
07-08 22:17:44.213: W/System.err(11859):    at com.jorgeandresserrano.gpstools.Page2.onCreateView(Page2.java:52)
07-08 22:17:44.213: W/System.err(11859):    at android.app.Fragment.performCreateView(Fragment.java:1695)
07-08 22:17:44.213: W/System.err(11859):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:903)
07-08 22:17:44.213: W/System.err(11859):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1075)
07-08 22:17:44.213: W/System.err(11859):    at android.app.BackStackRecord.run(BackStackRecord.java:682)
07-08 22:17:44.213: W/System.err(11859):    at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1455)
07-08 22:17:44.223: W/System.err(11859):    at android.app.FragmentManagerImpl$1.run(FragmentManager.java:441)
07-08 22:17:44.223: W/System.err(11859):    at android.os.Handler.handleCallback(Handler.java:725)
07-08 22:17:44.223: W/System.err(11859):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-08 22:17:44.223: W/System.err(11859):    at android.os.Looper.loop(Looper.java:137)
07-08 22:17:44.223: W/System.err(11859):    at android.app.ActivityThread.main(ActivityThread.java:5293)
07-08 22:17:44.223: W/System.err(11859):    at java.lang.reflect.Method.invokeNative(Native Method)
07-08 22:17:44.223: W/System.err(11859):    at java.lang.reflect.Method.invoke(Method.java:511)
07-08 22:17:44.223: W/System.err(11859):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
07-08 22:17:44.223: W/System.err(11859):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
07-08 22:17:44.223: W/System.err(11859):    at dalvik.system.NativeStart.main(Native Method)
07-08 22:17:44.223: W/System.err(11859): Caused by: java.lang.IllegalArgumentException: Binary XML file line #6: Duplicate id 0x7f05003f, tag null, or parent id 0xffffffff with another fragment for com.google.android.gms.maps.MapFragment
07-08 22:17:44.223: W/System.err(11859):    at android.app.Activity.onCreateView(Activity.java:4863)
07-08 22:17:44.233: W/System.err(11859):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:686)
07-08 22:17:44.233: W/System.err(11859):    ... 19 more
07-08 22:17:44.233: D/AndroidRuntime(11859): Shutting down VM
07-08 22:17:44.233: W/dalvikvm(11859): threadid=1: thread exiting with uncaught exception (group=0x410feac8)
07-08 22:17:44.233: E/AndroidRuntime(11859): FATAL EXCEPTION: main
07-08 22:17:44.233: E/AndroidRuntime(11859): java.lang.NullPointerException
07-08 22:17:44.233: E/AndroidRuntime(11859):    at com.myname.myapp.Page2.onCreateView(Page2.java:66)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.Fragment.performCreateView(Fragment.java:1695)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:903)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1075)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.BackStackRecord.run(BackStackRecord.java:682)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1455)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.FragmentManagerImpl$1.run(FragmentManager.java:441)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.os.Handler.handleCallback(Handler.java:725)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.os.Looper.loop(Looper.java:137)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at android.app.ActivityThread.main(ActivityThread.java:5293)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at java.lang.reflect.Method.invokeNative(Native Method)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at java.lang.reflect.Method.invoke(Method.java:511)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
07-08 22:17:44.233: E/AndroidRuntime(11859):    at dalvik.system.NativeStart.main(Native Method)

Button btnShowList = (Button) ui.findViewById(R.id.btnShowList);
对你的片段使用
OnResume
怎么样。引用您的ui。再次检查ui对象是否为空，然后再次充气。由于它是第二次调用，因此可能不会再次通过onCreateView。

在离开之前删除onDestroyView（）方法中的映射片段可以解决此问题。像这样：

@Override
public void onDestroyView() {
    super.onDestroyView();
    MapFragment f = (MapFragment) getFragmentManager().findFragmentById(R.id.map);
    if (f != null){ 
        getFragmentManager().beginTransaction().remove(f).commit();
    }
}
这篇文章更详细地解释了这一点

onCreateView（）比onResume（）先被调用，因此错误发生在onResume（）有任何交互机会之前。顺便说一句，我使用的是DroperLayout，通常是第一次调用onCreateView时。之后，如果片段没有被销毁，那么当它被第二次调用时，onCreateView将不再被触发（因为视图已经膨胀）。就像在暂停时释放所有视图引用或在恢复时恢复所有视图一样。从我的观点来看，这很奇怪，因为如果片段被膨胀，并且你没有处理包含片段内容的活动，OnCreateView被第二次调用。sush as finish（）我认为这与片段的管理有关，但不确定发生了什么。它一直在调用onCreateView（）。可能是抽屉布局处理碎片的方式？读取stactrace异常首先发生在第52行com.jorgeandresserrano.gpstools.Page2.onCreateView。。。在您的IDE上，该行中有哪些代码？非常有效-感谢最好的解决方案…；）