使用 TabLayout 在 ViewPager 中的 Google 地图片段中膨胀异常

Question

我制作了一个应用程序，其中我在我的位置上显示了带有 GPS 位置标记的 Google 地图。这张地图在第一个选项卡上，我还有另外两个选项卡，如下图所示

现在我面临一个问题，即当我从选项卡 1 移动到选项卡 2 再到选项卡 1 时，它可以正常工作，但是当我移动到选项卡 3 然后返回到选项卡 1 或选项卡 2 时，应用程序崩溃并且在LogCat 中给出以下异常：

01-27 18:35:26.190 9414-9414/com.example.accurat.faisal E/AndroidRuntime: FATAL EXCEPTION: main
  Process: com.example.accurat.faisal, PID: 9414
  android.view.InflateException: Binary XML file line #26: Binary XML file line #26: Error inflating class fragment
      at android.view.LayoutInflater.inflate(LayoutInflater.java:551)
      at android.view.LayoutInflater.inflate(LayoutInflater.java:429)
      at com.example.accurat.faisal.MyLocation.onCreateView(MyLocation.java:62)
      at android.support.v4.app.Fragment.performCreateView(Fragment.java:2184)
      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1298)
      at android.support.v4.app.FragmentManagerImpl.moveFragmentsToInvisible(FragmentManager.java:2323)
      at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2136)
      at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2092)
      at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1969)
      at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:620)
      at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143)
      at android.support.v4.view.ViewPager.populate(ViewPager.java:1268)
      at android.support.v4.view.ViewPager.populate(ViewPager.java:1116)
      at android.support.v4.view.ViewPager$3.run(ViewPager.java:273)
      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
      at android.view.Choreographer.doCallbacks(Choreographer.java:686)
      at android.view.Choreographer.doFrame(Choreographer.java:619)
      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
      at android.os.Handler.handleCallback(Handler.java:739)
      at android.os.Handler.dispatchMessage(Handler.java:95)
      at android.os.Looper.loop(Looper.java:148)
      at android.app.ActivityThread.main(ActivityThread.java:7325)
      at java.lang.reflect.Method.invoke(Native Method)
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
   Caused by: android.view.InflateException: Binary XML file line #26: Error inflating class fragment
      at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:794)
      at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:716)
      at android.view.LayoutInflater.rInflate(LayoutInflater.java:847)
      at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:810)
      at android.view.LayoutInflater.inflate(LayoutInflater.java:527)
      at android.view.LayoutInflater.inflate(LayoutInflater.java:429) 
      at com.example.accurat.faisal.MyLocation.onCreateView(MyLocation.java:62) 
      at android.support.v4.app.Fragment.performCreateView(Fragment.java:2184) 
      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1298) 
      at android.support.v4.app.FragmentManagerImpl.moveFragmentsToInvisible(FragmentManager.java:2323) 
      at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2136) 
      at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2092) 
      at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1969) 
      at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:620) 
      at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143) 
      at android.support.v4.view.ViewPager.populate(ViewPager.java:1268) 
      at android.support.v4.view.ViewPager.populate(ViewPager.java:1116) 
      at android.support.v4.view.ViewPager$3.run(ViewPager.java:273) 
      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911) 
      at android.view.Choreographer.doCallbacks(Choreographer.java:686) 
      at android.view.Choreographer.doFrame(Choreographer.java:619) 
      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897) 
      at android.os.Handler.handleCallback(Handler.java:739) 
      at android.os.Handler.dispatchMessage(Handler.java:95) 
      at android.os.Looper.loop(Looper.java:148) 
      at android.app.ActivityThread.main(ActivityThread.java:7325) 
      at java.lang.reflect.Method.invoke(Native Method) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 
   Caused by: java.lang.IllegalArgumentException: Binary XML file line #26: Duplicate id 0x7f10010d, tag null, or parent id 0xffffffff with another fragment for com.google.android.gms.maps.SupportMapFragment
      at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3364)
      at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:47)
      at android.view.LayoutInflater$FactoryMerger.onCreateView(LayoutInflater.java:192)
      at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:758)
      at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:716) 
      at android.view.LayoutInflater.rInflate(LayoutInflater.java:847) 
      at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:810) 
      at android.view.LayoutInflater.inflate(LayoutInflater.java:527) 
      at android.view.LayoutInflater.inflate(LayoutInflater.java:429) 
      at com.example.accurat.faisal.MyLocation.onCreateView(MyLocation.java:62) 
      at android.support.v4.app.Fragment.performCreateView(Fragment.java:2184) 
      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1298) 
      at android.support.v4.app.FragmentManagerImpl.moveFragmentsToInvisible(FragmentManager.java:2323) 
      at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2136) 
      at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2092) 
      at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1969) 
      at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:620) 
      at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143) 
      at android.support.v4.view.ViewPager.populate(ViewPager.java:1268) 
      at android.support.v4.view.ViewPager.populate(ViewPager.java:1116) 
      at android.support.v4.view.ViewPager$3.run(ViewPager.java:273) 
      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911) 
      at android.view.Choreographer.doCallbacks(Choreographer.java:686) 
      at android.view.Choreographer.doFrame(Choreographer.java:619) 
      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897) 
      at android.os.Handler.handleCallback(Handler.java:739) 
      at android.os.Handler.dispatchMessage(Handler.java:95) 
      at android.os.Looper.loop(Looper.java:148) 
      at android.app.ActivityThread.main(ActivityThread.java:7325) 
      at java.lang.reflect.Method.invoke(Native Method) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) at 
    com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

它在以下点显示错误：

// inflat and return the layout
    View rootView = inflater.inflate(R.layout.my_location, container, false);

无论我选择任何选项卡，它总是在上面一行显示错误，即当我转到我的pictures 选项卡并返回camera 或my location 选项卡时，它总是向我显示错误上面一行。

下面是我的布局

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.accurat.faisal">

<permission android:name="com.example.accurat.faisal.permission.MAPS_RECEIVE"
    android:protectionLevel="signature"/>

<uses-permission android:name="com.example.accurat.faisal.permission.MAPS_RECEIVE"/>
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

<uses-feature
    android:glEsVersion="0x00020000"
    android:required="true"
    />


<application
    android:name=""
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <meta-data
        android:name="com.google.android.geo.API_KEY"
        android:value="MY_KEY"
        />

    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

下面是我的布局代码

<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.accurat.faisal.MyLocation$PlaceholderFragment">

<TextView
    android:id="@+id/section_label"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/section_label"
    android:id="@+id/textView"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:textAppearance="@style/TextAppearance.AppCompat.Body2" />

<fragment 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:id="@+id/map"
    tools:context="com.example.app.MyLocation"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_below="@+id/section_label" />

我已经搜索并找到了很多关于它们的答案（1、2、3），但找不到任何帮助

我坚持下去，任何帮助将不胜感激

Answer 1

注意：当该布局时，您不能将布局膨胀为片段 包括一个 。

只有在添加时才支持嵌套片段 动态到一个片段。

这将解决您的问题，但请注意，还有更好的，

• 在地图片段中保留静态视图
• 在onCreateView 检查视图是否为空，第一次它会为空
• 如果有一个视图（在第一次加载后），您需要删除它，所以每次片段被调用时就像第一次一样
• 然后您可以将视图（您的 my_location）设置为片段，这样您就不会遇到嵌套片段问题

例子：

 private static View view;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        if (view != null) {
            ViewGroup viewGroupParent = (ViewGroup) view.getParent();
            if (viewGroupParent != null)
                viewGroupParent.removeView(view);
        }
        try {
            view = inflater.inflate(R.layout.yourLayoutWithMap, container, false);
        } catch (Exception e) {
            // map is already there
        }
        return view;
    }

寻找有趣的答案here

Answer 2

此问题是由于将 MapFragment 作为包含 Google 地图的根 ViewPager 片段的嵌套片段而引起的。

解决此问题的最简单直接的方法是让进入 ViewPager 的 Fragment 直接扩展 SupportMapFragment。

这是一个工作示例。

首先，包含 ViewPager Adapter 的 Activity 会在第一个选项卡中显示 Google 地图：

public class MainActivity extends AppCompatActivity {

    ViewPager viewPager;
    PagerAdapter pagerAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        // Get the ViewPager and set it's PagerAdapter so that it can display items
        viewPager = (ViewPager) findViewById(R.id.viewpager);
        pagerAdapter = new PagerAdapter(getSupportFragmentManager(), MainActivity.this);
        viewPager.setAdapter(pagerAdapter);

        // Give the TabLayout the ViewPager
        TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
        tabLayout.setupWithViewPager(viewPager);

        // Iterate over all tabs and set the custom view
        for (int i = 0; i < tabLayout.getTabCount(); i++) {
            TabLayout.Tab tab = tabLayout.getTabAt(i);
            tab.setCustomView(pagerAdapter.getTabView(i));
        }
    }

    class PagerAdapter extends FragmentPagerAdapter {

        String tabTitles[] = new String[] { "Tab One", "Tab Two", "Tab Three", };
        public Fragment[] fragments = new Fragment[tabTitles.length];
        Context context;

        public PagerAdapter(FragmentManager fm, Context context) {
            super(fm);
            this.context = context;
        }

        @Override
        public int getCount() {
            return tabTitles.length;
        }

        @Override
        public Fragment getItem(int position) {

            switch (position) {
                case 0:
                    return new MapFragment();
                case 1:
                    return new BlankFragment();
                case 2:
                    return new BlankFragment();
            }

            return null;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            // Generate title based on item position
            return tabTitles[position];
        }

        public View getTabView(int position) {
            View tab = LayoutInflater.from(MainActivity.this).inflate(R.layout.custom_tab, null);
            TextView tv = (TextView) tab.findViewById(R.id.custom_text);
            tv.setText(tabTitles[position]);
            return tab;
        }

        //This populates your Fragment reference array:
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            Fragment createdFragment = (Fragment) super.instantiateItem(container, position);
            fragments[position]  = createdFragment;
            return createdFragment;
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {
        if (requestCode == MapFragment.MY_PERMISSIONS_REQUEST_LOCATION){
            MapFragment mapFragment = (MapFragment) pagerAdapter.fragments[0];
            if (mapFragment != null) {
                mapFragment.onRequestPermissionsResult(requestCode, permissions, grantResults);
            }
        }
        else {
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }
}

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.danielnugent.mapapplication.MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay"
        android:elevation="6dp">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
            android:elevation="0dp" />

        <android.support.design.widget.TabLayout
            android:id="@+id/tab_layout"
            app:tabMode="fixed"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/toolbar"
            android:background="?attr/colorPrimary"
            android:elevation="0dp"
            app:tabTextColor="#d3d3d3"
            app:tabSelectedTextColor="#ffffff"
            app:tabIndicatorColor="#ff00ff"
            android:minHeight="?attr/actionBarSize"
            />

    </android.support.design.widget.AppBarLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="fill_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
/>

</android.support.design.widget.CoordinatorLayout>

custom_tab.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:id="@+id/custom_text"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:background="?attr/selectableItemBackground"
        android:gravity="center"
        android:textSize="16dip"
        android:textColor="#ffffff"
        android:maxLines="1"
        />
</LinearLayout>

MapFragment（来自我的other answer here），直接扩展了SupportMapFragment，不需要膨胀任何xml布局：

public class MapFragment extends SupportMapFragment
        implements OnMapReadyCallback,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener {

    GoogleMap mGoogleMap;
    SupportMapFragment mapFrag;
    LocationRequest mLocationRequest;
    GoogleApiClient mGoogleApiClient;
    Location mLastLocation;
    Marker mCurrLocationMarker;

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

        setUpMapIfNeeded();
    }

    private void setUpMapIfNeeded() {

        if (mGoogleMap == null) {
            getMapAsync(this);
        }
    }
    @Override
    public void onPause() {
        super.onPause();

        //stop location updates when Activity is no longer active
        if (mGoogleApiClient != null) {
            LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
        }
    }

    @Override
    public void onMapReady(GoogleMap googleMap)
    {
        mGoogleMap=googleMap;
        mGoogleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);

        //Initialize Google Play Services
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (ContextCompat.checkSelfPermission(getActivity(),
                    Manifest.permission.ACCESS_FINE_LOCATION)
                    == PackageManager.PERMISSION_GRANTED) {
                //Location Permission already granted
                buildGoogleApiClient();
                mGoogleMap.setMyLocationEnabled(true);
            } else {
                //Request Location Permission
                checkLocationPermission();
            }
        }
        else {
            buildGoogleApiClient();
            mGoogleMap.setMyLocationEnabled(true);
        }
    }

    protected synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        mGoogleApiClient.connect();
    }

    @Override
    public void onConnected(Bundle bundle) {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(1000);
        mLocationRequest.setFastestInterval(1000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
        if (ContextCompat.checkSelfPermission(getActivity(),
                Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) {
            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
        }
    }

    @Override
    public void onConnectionSuspended(int i) {}

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {}

    @Override
    public void onLocationChanged(Location location)
    {
        mLastLocation = location;
        if (mCurrLocationMarker != null) {
            mCurrLocationMarker.remove();
        }

        //Place current location marker
        LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(latLng);
        markerOptions.title("Current Position");
        markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
        mCurrLocationMarker = mGoogleMap.addMarker(markerOptions);

        //move map camera
        mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
        mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(11));

        //optionally, stop location updates if only current location is needed
        if (mGoogleApiClient != null) {
            LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
        }
    }

    public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
    private void checkLocationPermission() {
        if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {

            // Should we show an explanation?
            if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),
                    Manifest.permission.ACCESS_FINE_LOCATION)) {

                // Show an explanation to the user *asynchronously* -- don't block
                // this thread waiting for the user's response! After the user
                // sees the explanation, try again to request the permission.
                new AlertDialog.Builder(getActivity())
                        .setTitle("Location Permission Needed")
                        .setMessage("This app needs the Location permission, please accept to use location functionality")
                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialogInterface, int i) {
                                //Prompt the user once explanation has been shown
                                ActivityCompat.requestPermissions(getActivity(),
                                        new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                                        MY_PERMISSIONS_REQUEST_LOCATION );
                            }
                        })
                        .create()
                        .show();


            } else {
                // No explanation needed, we can request the permission.
                ActivityCompat.requestPermissions(getActivity(),
                        new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                        MY_PERMISSIONS_REQUEST_LOCATION );
            }
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST_LOCATION: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    // permission was granted, yay! Do the
                    // location-related task you need to do.
                    if (ContextCompat.checkSelfPermission(getActivity(),
                            Manifest.permission.ACCESS_FINE_LOCATION)
                            == PackageManager.PERMISSION_GRANTED) {

                        if (mGoogleApiClient == null) {
                            buildGoogleApiClient();
                        }
                        mGoogleMap.setMyLocationEnabled(true);
                    }

                } else {

                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                    Toast.makeText(getActivity(), "permission denied", Toast.LENGTH_LONG).show();
                }
                return;
            }

            // other 'case' lines to check for other
            // permissions this app might request
        }
    }

}

结果：

Answer 3

不要为您的地图使用片段，而是尝试使用MapView。有很多关于如何做到这一点的教程。

同时更改 ViewPager 的屏幕外页面限制。您可以查看this 文章了解更多信息。这样一来，您的标签页将不会在屏幕外重新创建。

Answer 4

我尊重所有答案，但我找到了这个唯一的解决方案： 如果 n 是选项卡数，则：

mViewPager.setOffscreenPageLimit(n);

示例： 如果提到：

mViewPager.setOffscreenPageLimit(2);

View pager 实现了一个队列，因此您不必让它删除该片段。 onCreateView 只被调用一次。