android - 在 android 中使用 fragment 内的 map 时，应用程序在按下后退时崩溃？

Question

我在 actionbar Activity 中使用了抽屉导航，现在我在同一个 Activity 中使用了多个 fragment ，但问题是当我第一次加载 mapfragment 时它显示完美但是当我按下后退按钮时我的应用程序崩溃它显示非法参数异常。

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();
    }
}

如果有帮助就点赞