android - 选项卡上的 SupportMapFragment。我只能看到一次

Question

我正在使用 FragmentTabHost 开发一个选项卡式应用程序。我的一个选项卡( fragment )是一个 map (扩展 fragment )，我只能在第一次选择它时看到，如果我选择其他选项卡并返回 map ，应用程序崩溃......

应用必须兼容API8

主要 Activity

package pack.unimaps2;

import com.google.android.gms.common.GooglePlayServicesUtil;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTabHost;
import android.view.Menu;

public class MainActivity extends FragmentActivity {
private FragmentTabHost mTabHost;

@Override
protected void onCreate(Bundle savedInstanceState) {
    GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost);
    mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);

    mTabHost.addTab(mTabHost.newTabSpec("simple").setIndicator("Ir a..."),
            Fragments.RutaHastaTab.class, null);
    mTabHost.addTab(mTabHost.newTabSpec("mapa").setIndicator("Mapa"),
            Fragments.map.class, null);
    mTabHost.addTab(mTabHost.newTabSpec("acercade").setIndicator("Acerca de..."),
            Fragments.AcercaDeTab.class, null);

}


}

FragmentsActivity(省略第一个 fragment )

package pack.unimaps2;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;


import com.google.android.gms.maps.SupportMapFragment;

public class Fragments extends FragmentActivity {


    public static class map extends Fragment{

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

    }

    public static class AcercaDeTab extends Fragment {

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

    }
}

以及用于创建 map fragment View 的 xml (map.xml):

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/map"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 class="com.google.android.gms.maps.SupportMapFragment"/>

日志

03-30 21:07:49.180: E/AndroidRuntime(16464): FATAL EXCEPTION: main
03-30 21:07:49.180: E/AndroidRuntime(16464): android.view.InflateException: Binary XML file line #1: Error inflating class fragment
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at pack.unimaps2.Fragments$map.onCreateView(Fragments.java:73)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.support.v4.app.FragmentManagerImpl.attachFragment(FragmentManager.java:1264)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:672)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.os.Handler.handleCallback(Handler.java:615)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.os.Handler.dispatchMessage(Handler.java:92)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.os.Looper.loop(Looper.java:137)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.app.ActivityThread.main(ActivityThread.java:4745)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at java.lang.reflect.Method.invokeNative(Native Method)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at java.lang.reflect.Method.invoke(Method.java:511)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at dalvik.system.NativeStart.main(Native Method)
03-30 21:07:49.180: E/AndroidRuntime(16464): Caused by: java.lang.IllegalArgumentException: Binary XML file line #1: Duplicate id 0x7f040007, tag null, or parent id 0x0 with another fragment for com.google.android.gms.maps.SupportMapFragment
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:285)
03-30 21:07:49.180: E/AndroidRuntime(16464):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
03-30 21:07:49.180: E/AndroidRuntime(16464):    ... 18 more

不知道哪里出了问题，谢谢大家的帮助...

Answer 1

还在寻找答案吗？

您不能一直在每次 onCreateView 时都膨胀布局。使用以下内容:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    if (view != null && this.previousContainer == container) {
        ViewGroup parent = (ViewGroup) view.getParent();
        if (parent != null) {
            parent.removeView(view);
        }
    } else {
        try {
            view = inflater.inflate(R.layout.map, container, false);
            this.previousContainer = container;
        } catch (InflateException e) {
            Log.w("InflateException happened ou nous", e.getMessage());
        }
    }
    return view;
}

我设法防止了这种情况，并且在重新创建 fragment 时也丢失了 map (例如，当从垂直更改为横向时)