当在android中使用地图内部片段时，应用程序正在崩溃。

Question

我曾经在actionbar活动中使用过导航抽屉，现在我在同一活动中使用了多个片段，但问题是，当我第一次加载映射片段时，它是完美的显示，但是当我按回键时，我的应用程序崩溃了，它是显示非法参数异常。

Mapfragment.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.json.JSONObject;

import com.compass.DirectionsJSONParser;
import com.compass.GPSTracker;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapsInitializer;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.PolylineOptions;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class MapFragment extends Fragment {

    GoogleMap googlemap;
    GPSTracker gps;

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

    @Override
    public void onCreate(Bundle savedInstanceState) {
        setRetainInstance(true);
        super.onCreate(savedInstanceState);
    }

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

        gps=new GPSTracker(getActivity());
        googlemap = ((SupportMapFragment) getActivity().getSupportFragmentManager().findFragmentById(R.id.mapviews)).getMap();  
        MapsInitializer.initialize(getActivity().getApplicationContext());

        // current location
        double currentlat=gps.getLatitude();
        double currentlon=gps.getLongitude();

        // destination location
        //double destlat=23.048854;
        //double destlon=72.516059;

        double destlat=22.9833;
        double destlon=72.5000;

        final LatLng currentpoint = new LatLng(currentlat,currentlon);
        final LatLng destinationpoint = new LatLng(destlat,destlon);

        // fro add marker on map
        googlemap.addMarker(new MarkerOptions()
                 .position(new LatLng(currentlat, currentlon))
                 .title("Current Location")
                 .icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_source)));

        googlemap.animateCamera(CameraUpdateFactory.zoomTo(237.0f));
        googlemap.moveCamera(CameraUpdateFactory.newLatLng(currentpoint));

        googlemap.addMarker(new MarkerOptions()
        .position(new LatLng(destlat, destlon))
        .title("WebOffice")
        .icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_destination)));

        /*
        String url = getDirectionsUrl(currentpoint, destinationpoint);              
        DownloadTask downloadTask = new DownloadTask();

        // Start downloading json data from Google Directions API
        downloadTask.execute(url);
        */

    }

fragment_map.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <fragment
        android:id="@+id/mapviews"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.SupportMapFragment" />

</LinearLayout>

Logcat

 12-09 11:48:05.165: E/AndroidRuntime(9701): FATAL EXCEPTION: main
    12-09 11:48:05.165: E/AndroidRuntime(9701): Process: com.weboffice, PID: 9701
    12-09 11:48:05.165: E/AndroidRuntime(9701): android.view.InflateException: Binary XML file line #7: Error inflating class fragment
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at com.weboffice.MapFragment.onCreateView(MapFragment.java:45)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:938)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:446)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.os.Handler.handleCallback(Handler.java:733)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.os.Handler.dispatchMessage(Handler.java:95)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.os.Looper.loop(Looper.java:136)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.app.ActivityThread.main(ActivityThread.java:5017)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at java.lang.reflect.Method.invokeNative(Native Method)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at java.lang.reflect.Method.invoke(Method.java:515)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at dalvik.system.NativeStart.main(Native Method)
    12-09 11:48:05.165: E/AndroidRuntime(9701): Caused by: java.lang.IllegalArgumentException: Binary XML file line #7: Duplicate id 0x7f0b005c, tag null, or parent id 0x0 with another fragment for com.google.android.gms.maps.SupportMapFragment
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:296)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:685)
    12-09 11:48:05.165: E/AndroidRuntime(9701):     ... 19 more

Answer 1

使用此代码

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

    try {
        Fragment fragment = (getFragmentManager()
                .findFragmentById(R.id.map));
        FragmentTransaction ft = getActivity().getSupportFragmentManager()
                .beginTransaction();
        ft.remove(fragment);
        ft.commit();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

如果这有帮助的话，把这个标记出来

Answer 2

不要在布局中声明de SupportMapFragment，而是通过编程进行，并确保使用getChildFragmentMananger而不是经典的getFragmentManager()来创建片段。

mMapFragment = SupportMapFragment.newInstance();
FragmentTransaction fragmentTransaction =
         getChildFragmentManager().beginTransaction();
 fragmentTransaction.add(R.id.map_root, mMapFragment);
 fragmentTransaction.commit(); 

保留这个SupportMapFragment mMapFragment，因为您需要它来检索GoogleMap对象：

 GoogleMap map = mMapFragment.getMap();

Answer 3

也是这样工作的

  @Override
    public void onDestroyView() {
        try{
            SupportMapFragment fragment = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.mapviews));
            FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
            ft.remove(fragment);
            ft.commit();
          }catch(Exception e){
          }

        super.onDestroyView();
    }