使用 TabLayout 在 ViewPager 中的 Google 地图片段中膨胀异常
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【中文标题】使用 TabLayout 在 ViewPager 中的 Google 地图片段中膨胀异常【英文标题】：Inflate Exception in Google Map Fragment in ViewPager with TabLayout 【发布时间】：2017-06-13 06:36:58 【问题描述】：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_
android:layout_
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_
android:layout_ />
<TextView
android:layout_
android:layout_
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_
android:layout_
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
【问题讨论】：
You cannot inflate a layout into a fragment when that layout includes a <fragment>. Nested fragments are only supported when added to a fragment dynamically @Selvin 那么没有其他解决方案了吗？ 您可以在父片段中以编程方式创建 SupportMapFragment。不，我不会搜索你如何做到这一点 @faisal1208 检查我的答案 ^_^ @Charuka 抱歉回复晚了，我正在调查你的回答，希望它能解决我的问题 :) 【参考方案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
【讨论】：
在`parent.removeView(viewGroupParent);`中初始化parent?
我很高兴它有帮助:)
这个解决方案绝对正确.. @thank charu bhai :)【参考方案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_
android:layout_
android:fitsSystemWindows="true"
tools:context="com.danielnugent.mapapplication.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_
android:layout_
android:theme="@style/AppTheme.AppBarOverlay"
android:elevation="6dp">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_
android:layout_
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_
android:layout_
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_
android:layout_
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_
android:layout_>
<TextView
android:id="@+id/custom_text"
android:layout_
android:layout_
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：
【讨论】：
【参考方案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。
【讨论】：
添加mapView 后出现错误 java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.SupportMapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)' on a null object reference
我已经做到了mapFrag = (SupportMapFragment)getChildFragmentManager().findFragmentById(R.id.mapView); mapFrag.getMapAsync(this);
仅仅将fragment改为MapView是不够的。正如我所说，有很多教程。这是整个想法的简短版本 - matt-reid.co.uk/blog_post.php?id=93 这是更长的版本 - inducesmile.com/android/android-mapview-example-tutorial
@faisal1208 你为什么要使用 getChildFragmentManager()。而是使用 getSupportFragmentManager()。还要在片段标记下的 xml class="com.google.android.gms.maps.SupportMapFragment" 中添加这一行。 mapFrag.getMapAsync(this) 仅在您的类实现实现 OnMapReadyCallback 时才需要
如果反对的选民分享他们的想法，我将不胜感激。【参考方案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。
【讨论】：
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