Question

我正在使用FragmentTabHost处理选项卡式应用程序。我的一个标签（片段）是一个地图（扩展片段），我只能看到我第一次选择它，如果我选择其他标签并返回地图，应用程序崩溃......

该应用必须与API8兼容

主要活动

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（省略第一个片段）

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;
        }

    }
}

用xml创建地图片段视图（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

不知道出了什么问题，谢谢你的帮助......

Answer 1

仍在寻找答案？

每次onCreateView都不能给布局充气。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;
}

我设法阻止了这一点，并在重新创建片段时丢失了地图（例如，当从垂直变为风景时）

Answer 2

片段应该有一个空的构造函数

如下：

public static class map extends Fragment{

    public map(){
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.map, container, false);
        // Change the previous line to this:
        View v = inflater.inflate(R.layout.map, null);

        return v;
    }

}

Answer 3

问题是你正在尝试创建一个旧视图，而旧视图存在旧视图;只需简单地实现此代码即可。

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

    if (v != null) {
        ViewGroup parent = (ViewGroup) v.getParent();
        if (parent != null)
            parent.removeView(v);
    }
    try {
         v = inflater.inflate(R.layout.map_fragment, container, false);
    } catch (InflateException e) {
        // map is already there, just return view as it is
    }

    return v;
}

Answer 4

此解决方案有效，但可能不是您的情况。我遇到了同样的问题但在FragmentPagerAdapter内使用了ViewPager，而不是TabHost。

我所做的是让ViewPager始终存储所有页面：

viewPager.setOffscreenPageLimit(2); 
viewPager.setAdapter(adapter);

所以带有地图片段的标签（在我的情况下为第0页）将永远不会被删除并重新创建，从而摆脱了问题。

值2表示它将在前两页中保留在内存中，并在当前页之后保留两页。当你有3个标签时就足够了。如果您有更多选项卡，请随意增加它，但您的应用程序的内存消耗也会增加

选项卡上的SupportMapFragment。我只能看一次

4 个答案: