blocks|key|4490744|text|您正在尝试在片段存在之前查找该片段。您指出包含该片段的布局是fragment_example_map.xml。但是，您正在尝试在膨胀布局文件之前找到地图片段。这是行不通的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4490745|除此之外，您似乎正在尝试从另一个片段的onCreateView()方法中获取映射片段。我不知道您为什么要在这里嵌套片段，因为这似乎会使您的代码更复杂和更脆弱，而没有明显的好处。|4490746|entityMap^0|U|O|0|J|E|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

You are attempting to find a fragment before it exists. You indicate that the layout that has the fragment is <code>fragment_example_map.xml</code>. However, you are trying to find the map fragment before you inflate that layout file. This will not work.

Beyond that, you appear to be trying to get at the map fragment from inside another fragment, in that fragment's <code>onCreateView()</code> method. I do not know why you are nesting fragments here, as it seems like it will make your code more complex and more fragile for no obvious benefit.

blocks|key|4491744|text|替换此代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4491745|<fragment+
++++android:name="com.google.android.gms.maps.MapFragment"
++++android:id="@%2Bid/map"
++++android:layout_width="fill_parent"
++++android:layout_height="400dp"+/>|code-block|syntax|javascript|4491746|和|4491747|if+(googleMap+==+null)+{
++++++++mapFrag+=++(MapFragment)getFragmentManager().findFragmentById(R.id.map);
++++++++mapFrag.getMapAsync(this);
++++}else{
++++++++GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);

++++}|4491748|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

replace this code

<pre><code>&lt;fragment 
 android:name="com.google.android.gms.maps.MapFragment"
 android:id="@+id/map"
 android:layout_width="fill_parent"
 android:layout_height="400dp" /&gt;
</code></pre>

and

<pre><code>if (googleMap == null) {
 mapFrag = (MapFragment)getFragmentManager().findFragmentById(R.id.map);
 mapFrag.getMapAsync(this);
 }else{
 GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);

 }
</code></pre>

blocks|key|4491767|text|在片段中使用getChildFragmentManager()代替getActivity().getSupportFragmentManager()。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4491768|像这样：|4491769|SupportMapFragment+mapFragment+=+(SupportMapFragment)getChildFragmentManager()
++++++++++++.findFragmentById(R.id.map);
++++mapFragment.getMapAsync(this);+|code-block|syntax|javascript|4491770|entityMap^0|6|P|X|15|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

use <code>getChildFragmentManager()</code> in place of <code>getActivity().getSupportFragmentManager()</code> in the fragment.

like:

<pre><code>SupportMapFragment mapFragment = (SupportMapFragment)getChildFragmentManager()
 .findFragmentById(R.id.map);
 mapFragment.getMapAsync(this); 
</code></pre>

blocks|key|4490799|text|根据Android版本或SDK版本5或更高版本，使用getChildFragmentManager()，低于该版本使用getFragmentManager()。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4490800|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Depending on Android version or SDK version 5 and above use getChildFragmentManager() and below it used getFragmentManager().

blocks|key|4490838|text|使用此命令而不是SupportMapFragment:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4490839|+GoogleMap+gooleMap;

+++((MapFragment)+getFragmentManager().findFragmentById(R.id.map)).getMapAsync(new+OnMapReadyCallback()+{
++++++++++++@Override
++++++++++++public+void+onMapReady(GoogleMap+map)+{
++++++++++++++++googleMap+=+map;
++++++++++++}
++++++++});|code-block|syntax|javascript|4490840|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

use this instead of SupportMapFragment:)
<pre><code> GoogleMap gooleMap;

 ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMapAsync(new OnMapReadyCallback() {
 @Override
 public void onMapReady(GoogleMap map) {
 googleMap = map;
 }
 });
</code></pre>

blocks|key|4491880|text|只需在您的活动中调用onResume中的supportMapFragment.getMapAsync(this);|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4491881|entityMap^0|A|8|K|11|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Just Call <code>supportMapFragment.getMapAsync(this);</code> in <code>onResume</code> in your Activity

blocks|key|4490892|text|如果您在片段中使用android:name="com.google.android.gms.maps.MapFragment"，则使用以下命令更改代码：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4490893|MapFragment+mapFragment1+=+(MapFragment)getFragmentManager().findFragmentById(R.id.map);
++++++++mapFragment1.getMapAsync(this);|code-block|syntax|javascript|4490894|但是，如果您在片段中使用android:name="com.google.android.gms.maps.SupportMapFragment"，则使用以下代码：|4490895|SupportMapFragment+mapFragment+=+(SupportMapFragment)+getSupportFragmentManager().findFragmentById(R.id.map);
++++++++mapFragment.getMapAsync(this);|4490896|entityMap^0|9|1I|0|0|C|1P|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

If your are using <code>android:name="com.google.android.gms.maps.MapFragment"</code> in your fragment then change your code with:

<pre><code>MapFragment mapFragment1 = (MapFragment)getFragmentManager().findFragmentById(R.id.map);
 mapFragment1.getMapAsync(this);
</code></pre>

However if your are using <code>android:name="com.google.android.gms.maps.SupportMapFragment"</code>
in your fragment then use this code: 

<pre><code>SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
 mapFragment.getMapAsync(this);
</code></pre>

blocks|key|4490903|text|这对我来说很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4490904|SupportMapFragment+mapFragment+=+(SupportMapFragment)getChildFragmentManager()
++++++++++++.findFragmentById(R.id.map);
++++mapFragment.getMapAsync(this);+|code-block|syntax|javascript|4490905|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

this works for me:

<pre><code>SupportMapFragment mapFragment = (SupportMapFragment)getChildFragmentManager()
 .findFragmentById(R.id.map);
 mapFragment.getMapAsync(this); 
</code></pre>

blocks|key|4490939|text|面临着同样的问题。由于您在片段中使用映射片段，因此请使用getChildFragmentManager()而不是getActivity().getFragmentManager()或getFragmentManager()。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4490940|entityMap^0|S|P|1K|Y|2J|K|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

Faced the same problem. Since you are using the Map fragment within a Fragment use <code>getChildFragmentManager()</code> instead of <code>getActivity().getFragmentManager()</code> or <code>getFragmentManager()</code>.

blocks|key|4492012|text|如果您想在side+Fragment中使用map+Fragment，请使用此命令|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4492013|SupportMapFragment+mMapFragment+=+SupportMapFragment.newInstance();
FragmentTransaction+fragmentTransaction+=
getChildFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.flMap,+mMapFragment);
fragmentTransaction.commit();
mMapFragment.getMapAsync(this);|code-block|syntax|javascript|4492014|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you want use map Fragment in side Fragment use this

<pre><code>SupportMapFragment mMapFragment = SupportMapFragment.newInstance();
FragmentTransaction fragmentTransaction =
getChildFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.flMap, mMapFragment);
fragmentTransaction.commit();
mMapFragment.getMapAsync(this);
</code></pre>

blocks|key|4492047|text|在onCreate中尝试此代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4492048|if+(mapFragment+!=+null)+{
++++mapFragment.getMapAsync(this);
}|code-block|syntax|javascript|4492049|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this code in onCreate

<pre><code>if (mapFragment != null) {
 mapFragment.getMapAsync(this);
}
</code></pre>

I am using <code>com.google.android.gms:play-services-maps:7.5.0</code> version of Google Maps services. When trying to call the below I get <code>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</code>.

<pre><code>@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
 Bundle savedInstanceState) {
 SupportMapFragment mapFragment = (SupportMapFragment) getActivity().getSupportFragmentManager()
 .findFragmentById(R.id.map);
 mapFragment.getMapAsync(this); //error

 return inflater.inflate(R.layout.fragment_example_map, container, false);
}
</code></pre>

fragment_example_map.xml file:

<pre><code>&lt;FrameLayout 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"
 tools:context="app.ExampleMap"&gt;

 &lt;fragment xmlns:android="http://schemas.android.com/apk/res/android"
 android:name="com.google.android.gms.maps.SupportMapFragment"
 android:id="@+id/map"
 android:layout_width="match_parent"
 android:layout_height="match_parent"/&gt;
&lt;/FrameLayout&gt;
</code></pre>

mapFragment.getMapAsync(this) - NullPointerException

Android

我使用的是谷歌地图服务的com.google.android.gms:play-services-maps:7.5.0版本。当我尝试调用下面的代码时，我得到了java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google...

问MapFragment.getMapAsync(此)- NullPointerException
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问MapFragment.getMapAsync(此)- NullPointerExceptionEN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问MapFragment.getMapAsync(此)- NullPointerException
EN