blocks|key|4560194|text|我遇到了同样的问题。下面是我解决这个问题的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4560195|4560196|因为它应该只是activity中mapView的一个实例，所以我在Activity中的onCreate方法中初始化它：|unordered-list-item|4560197|4560198|public+void+onCreate(Bundle+savedInstanceState)+{+super.onCreate(savedInstanceState)；//以编程方式初始化要在片段中使用的MapView+:+this.mActivityMapView+=新MapView(MainActivity.this，getString(R.string.debug_mapview_apikey))；setContentView(R.layout.activity_main)；}|4560199|然后我在片段onCreateView方法中恢复它：|4560200|4560201|公共视图onCreateView(LayoutInflater+inflater，ViewGroup容器，捆绑包savedInstanceState)+{+this.mMapView+=+((MainActivity)+getActivity()).getMapView()；LayoutInflater+this.mMapView；}|4560202|和我在片段onDestroy方法中销毁它：|4560203|4560204|public+void+onDestroy()+{+NoSaveStateFrameLayout+parentView+=+(NoSaveStateFrameLayout)+this.mMapView.getParent()；parentView.removeView(this.mMapView)；super.onDestroy()；}|4560205|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|V|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|W|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|E|7|Z|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|10|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|11|8|@]|9|@]|A|$]]|$1|N|3|O|5|E|7|12|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|14|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|T|$]]

I encountered the same issue. Here is how I solved it :

<ul>
<li>As it should be only one instance of the mapView in the activity, I initialize it in onCreate method in Activity :

<pre><code>public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 // initialize MapView programmatically to be used in Fragment :
 this.mActivityMapView = new MapView(MainActivity.this, getString(R.string.debug_mapview_apikey));

 setContentView(R.layout.activity_main);
}
</code></pre></li>
<li>Then I recover it in the fragment onCreateView method : 

<pre><code>public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 this.mMapView = ((MainActivity) getActivity()).getMapView();
 return this.mMapView;
}
</code></pre></li>
<li>And I destroy it in the fragment onDestroy method :

<pre><code>public void onDestroy() {
 NoSaveStateFrameLayout parentView = (NoSaveStateFrameLayout) this.mMapView.getParent();
 parentView.removeView(this.mMapView);
 super.onDestroy();
}
</code></pre></li>
</ul>

blocks|key|4842219|text|您可能希望删除onPause方法(而不是onDestroy方法)中的地图视图|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4842220|public+void+onPause()+{
++++NoSaveStateFrameLayout+parentView+=+(NoSaveStateFrameLayout)+this.mMapView.getParent();
++++parentView.removeView(this.mMapView);
++++super.onPause();}|code-block|syntax|javascript|4842221|通过这种方式，您可以将MapFragment添加到backstack。(FragmentTransaction.addToBackStack防止分片被销毁)|4842222|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You might want to remove the map view in the onPause method (instead of the onDestroy method)

<pre><code>public void onPause() {
 NoSaveStateFrameLayout parentView = (NoSaveStateFrameLayout) this.mMapView.getParent();
 parentView.removeView(this.mMapView);
 super.onPause();}
</code></pre>

This way, you can add a MapFragment to the backstack. (FragmentTransaction.addToBackStack prevents a fragment from being destroyed)

blocks|key|2944046|text|Max和Bleeker的回答效果很好，但如果你想支持屏幕方向的改变，你需要特别小心，就像我一样。事实证明，当您旋转屏幕时，它将在不调用onPause方法的情况下再次调用OnCreateView，从而添加两次mapview。为了解决这个问题，我在OnCreateView中执行了以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2944047|public+View+onCreateView(LayoutInflater+inflater,+ViewGroup+container,+Bundle+savedInstanceState)
{
++++this.mMapView+=+((MyGameActivity)+getActivity()).getMapView();
++++if+(this.mMapView.getParent()!=null)
++++{
++++++++NoSaveStateFrameLayout+parentView+=+(NoSaveStateFrameLayout)+this.mMapView.getParent();
++++++++parentView.removeView(this.mMapView);
++++}
++++return+this.mMapView;
}|code-block|syntax|javascript|2944048|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|$]]

Max and Bleeker's answers work well but you need to take special care if you want to support screen orientation changes, as I do. It turns out when you rotate the screen, it will call OnCreateView again without calling the onPause method, thus adding the mapview twice. To fix it, inside OnCreateView I did the following:

<pre><code>public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
 this.mMapView = ((MyGameActivity) getActivity()).getMapView();
 if (this.mMapView.getParent()!=null)
 {
 NoSaveStateFrameLayout parentView = (NoSaveStateFrameLayout) this.mMapView.getParent();
 parentView.removeView(this.mMapView);
 }
 return this.mMapView;
}
</code></pre>

blocks|key|2944063|text|我试着为这个问题找到一个简单的解决方案。在处理我的视图详细信息(一个RelativeLayout扩展)的类中，我声明了一个private+static+MapView+myMapView;。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2944064|然后，重写onFinishInflate()方法，如以下代码片段所示：|2944065|++++@Override
protected+void+onFinishInflate()+{++
++++super.onFinishInflate();

++++//myMapView+=+(MapView)+findViewById(R.id.map_view);
++++if+(myMapView==null)+
++++++++myMapView+=+new+MapView(context,+getResources().getString(R.string.map_view_api_key));++
++++if+(myMapView.getParent()+!=+null)
++++++++((ViewGroup)myMapView.getParent()).removeView(myMapView);

++++myMapView.setClickable(true);
++++myMapView.setEnabled(true);
++++RelativeLayout.LayoutParams+lp+=+new+RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,+RelativeLayout.LayoutParams.WRAP_CONTENT);
++++myMapView.setLayoutParams(lp);++++++++++
++++this.addView(myMapView);

}|code-block|syntax|javascript|2944066|这样，您只有一个MapView实例。|2944067|entityMap^0|1P|X|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|V|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

I tried to get a simple solution to this problem.
On the class that handles my View details (a RelativeLayout extension), I declared a <code>private static MapView myMapView;</code>.

Then, override onFinishInflate() method like the following code snippet:

<pre><code> @Override
protected void onFinishInflate() { 
 super.onFinishInflate();

 //myMapView = (MapView) findViewById(R.id.map_view);
 if (myMapView==null) 
 myMapView = new MapView(context, getResources().getString(R.string.map_view_api_key)); 
 if (myMapView.getParent() != null)
 ((ViewGroup)myMapView.getParent()).removeView(myMapView);

 myMapView.setClickable(true);
 myMapView.setEnabled(true);
 RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
 myMapView.setLayoutParams(lp); 
 this.addView(myMapView);

}
</code></pre>

This way you have only one instance of MapView.

blocks|key|4560369|text|这里是我如何在碎片的情况下解决这个问题的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|4560370|创建布局|4560371|+<LinearLayout
++++++++android:id="@%2Bid/ll_mapcontainer"
++++++++android:layout_width="match_parent"
++++++++android:layout_height="match_parent"
++++++++android:orientation="vertical"+/>|code-block|syntax|javascript|4560372|您可以将此布局类似于XML文件中要显示地图的任何位置|4560373|现在，代码将如下所示。|4560374|package+com.yuviii.sample;

import+android.content.Intent;
import+android.net.Uri;
import+android.os.Bundle;
import+android.support.v4.app.Fragment;
import+android.support.v4.app.FragmentManager;
import+android.view.LayoutInflater;
import+android.view.View;
import+android.view.ViewGroup;

import+com.google.android.gms.maps.GoogleMap;
import+com.google.android.gms.maps.SupportMapFragment;
import+com.google.android.gms.maps.model.LatLng;
import+com.google.android.gms.maps.model.MarkerOptions;
import+com.yuviii.sample.R;

/**
+*+Created+by+yubraj+Poudel+on+12/20/15.
+*/
public+class+ContactUsFragment+extends+Fragment++{
++++static+final+LatLng+PRACTICAL_ANSWER_LOCATION+=+new+LatLng(53.558,+9.927);
++++private+SupportMapFragment+fragment;
++++private+GoogleMap+map;

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



++++@Override
++++public+void+onActivityCreated(Bundle+savedInstanceState)+{
++++++++super.onActivityCreated(savedInstanceState);
++++++++++++++++++++initializeMap();
++++}

++++private+void+initializeMap()+{

++++++++FragmentManager+fm+=+getChildFragmentManager();
++++++++fragment+=+(SupportMapFragment)+fm.findFragmentById(R.id.ll_mapcontainer);
++++++++if+(fragment+==+null)+{
++++++++++++fragment+=+SupportMapFragment.newInstance();
++++++++++++fm.beginTransaction().replace(R.id.ll_mapcontainer,+fragment).commit();
++++++++}

++++}
++++@Override
++++public+void+onResume()+{
++++++++super.onResume();
++++++++if+(map+==+null)+{
++++++++++++map+=+fragment.getMap();
++++++++++++map.addMarker(new+MarkerOptions().position(PRACTICAL_ANSWER_LOCATION));
++++++++}
++++}+++
}|4560375|这对我很有效。尽情享受！|4560376|entityMap^0|0|L|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|12|8|@]|D|@]|E|$]]|$1|Q|3|R|5|J|7|13|8|@]|D|@]|E|$K|L]]|$1|S|3|T|5|6|7|14|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|V|$]]

Here is how i solved this issue in case of Fragment.

Create the Layout

<pre><code> &lt;LinearLayout
 android:id="@+id/ll_mapcontainer"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" /&gt;
</code></pre>

You can place this like layout anywhere in your XML File where you want to display the map

Now the Code will be Like this.

<pre><code>package com.yuviii.sample;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.yuviii.sample.R;

/**
 * Created by yubraj Poudel on 12/20/15.
 */
public class ContactUsFragment extends Fragment {
 static final LatLng PRACTICAL_ANSWER_LOCATION = new LatLng(53.558, 9.927);
 private SupportMapFragment fragment;
 private GoogleMap map;

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



 @Override
 public void onActivityCreated(Bundle savedInstanceState) {
 super.onActivityCreated(savedInstanceState);
 initializeMap();
 }

 private void initializeMap() {

 FragmentManager fm = getChildFragmentManager();
 fragment = (SupportMapFragment) fm.findFragmentById(R.id.ll_mapcontainer);
 if (fragment == null) {
 fragment = SupportMapFragment.newInstance();
 fm.beginTransaction().replace(R.id.ll_mapcontainer, fragment).commit();
 }

 }
 @Override
 public void onResume() {
 super.onResume();
 if (map == null) {
 map = fragment.getMap();
 map.addMarker(new MarkerOptions().position(PRACTICAL_ANSWER_LOCATION));
 }
 } 
}
</code></pre>

This works for me. Enjoy !!!

I am using the android compatibility class with the hack for using mapviews in a fragment found here: <a href="https://github.com/petedoyle/android-support-v4-googlemaps">https://github.com/petedoyle/android-support-v4-googlemaps</a>

Unfortunately, what I am finding is that if the mapfragment gets removed from the activity, and then readded, I get the "You are only allowed to have a single MapView in a MapActivity" error." 

I understand the principle behind the error, and tried destroying the mapview in the fragments onPause method. Unfortunately I can't seem to destroy the mapview completely, since I am still getting it. My Code looks like this:

<pre><code>private RelativeLayout layout; 
private MapView mp;

public void onResume(){
 super.onResume();
 Bundle args = getArguments();
 if(mp == null)
 {
 mp = new MapView(getActivity(), this.getString(R.string.map_api_key)); 
 mp.setClickable(true);
 }

 String request = args.getString("requestId");
 layout = (RelativeLayout) getView().findViewById(R.id.mapholder);
 layout.addView(mp);
 //TextView txt = (TextView) getView().findViewById(R.id.arguments);
 //txt.setText(request);
}

public void onPause(){
 super.onPause();
 layout.removeView(mp);
 mp = null;
}
</code></pre>

Does anyone have any thoughts on what the reference I am neglecting to destroy here?

Android mapview with fragments can't be added twice?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在使用android兼容类，通过hack在这里找到的片段中使用mapviews：不幸的是，我发现如果映射片段被从活动中删除，然后被读取，我会得到“你只能在MapActivity中有一个MapView”错误。我理解了错误背后的原理，并尝试使用fragments onPause方法销毁mapview。不幸的是，我似乎不...

问带碎片的Android mapview不能添加两次吗？
EN

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问带碎片的Android mapview不能添加两次吗？EN