Android - 影响类片段的错误

Question

我有两个片段和一个具有导航抽屉的主要活动。在导航抽屉中，我有两个菜单项，即 Home 和 Places。我为这两个菜单项创建了 xml 片段。

fragment_home.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="0dp"
tools:context="com.gaurav.googlemap.HomeMap" >

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

</RelativeLayout>

fragment_places.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" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Places"
    android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

Java 代码

package com.beproject.ourway;

import android.app.Fragment;
import android.app.FragmentManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;


public class MainHome extends FragmentActivity{
    private String[] mNavigationDrawerItemTitles;
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    Fragment fragment = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_home);

    // Initialization

    mNavigationDrawerItemTitles= getResources().getStringArray(R.array.navigation_drawer_items_array);
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mDrawerList = (ListView) findViewById(R.id.left_drawer);


    // Defining drawer items
    ObjectDrawerItem[] drawerItem = new ObjectDrawerItem[2];

    drawerItem[0] = new ObjectDrawerItem(R.drawable.ic_launcher, "Home");
    drawerItem[1] = new ObjectDrawerItem(R.drawable.ic_launcher, "Places");


    DrawerItemCustomAdapter adapter = 
            new DrawerItemCustomAdapter(this, R.layout.home_drawer_item, drawerItem);

    mDrawerList.setAdapter(adapter);

    mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

    // selectItem(0);
}

public class DrawerItemClickListener implements ListView.OnItemClickListener {

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        selectItem(position);
    }

}

void selectItem(int position) {



    switch (position) {
    case 0:
        fragment = new HomeFragment();
        break;
    case 1:
        fragment = new PlacesFragment();
        break;

    default:
        break;
    }

    if (fragment != null) {

        mDrawerLayout.closeDrawer(mDrawerList);

        FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();

        mDrawerList.setItemChecked(position, true);
        mDrawerList.setSelection(position);
        getActionBar().setTitle(mNavigationDrawerItemTitles[position]);

    } else {
        Log.e("MainActivity", "Error in creating fragment");
    }
}

public class HomeFragment extends Fragment {

    public HomeFragment() {
    }

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

        View rootView = inflater.inflate(R.layout.fragment_home, container, false);

        return rootView;
    }

}

public class PlacesFragment extends Fragment {

    public PlacesFragment() {
    }

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

        View rootView = inflater.inflate(R.layout.fragment_places, container, false);

        return rootView;
    }

}
}

问题

当我运行项目时，我点击主页菜单，然后它会以很好的方式向我显示带有地图的主页片段。之后我点击地方然后它显示我的地方片段很好。 但是当我再次点击主页时，我的应用程序将因以下异常而崩溃

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gaurav.googlemap/com.gaurav.googlemap.MainActivity}: android.view.InflateException: Binary XML file line #8: Error inflating class fragment

java 文件中是否有任何更正以正确打开片段？
谢谢

LogCat

02-16 16:50:58.324: V/Provider/Setting(25249): from settings cache , name = sound_effects_enabled value = 0
02-16 16:50:58.358: D/AndroidRuntime(25249): Shutting down VM
02-16 16:50:58.359: W/dalvikvm(25249): threadid=1: thread exiting with uncaught exception (group=0x4188b908)
02-16 16:50:58.388: E/AndroidRuntime(25249): FATAL EXCEPTION: main
02-16 16:50:58.388: E/AndroidRuntime(25249): android.view.InflateException: Binary XML file line #8: Error inflating class fragment
02-16 16:50:58.388: E/AndroidRuntime(25249):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
02-16 16:50:58.388: E/AndroidRuntime(25249):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
02-16 16:50:58.388: E/AndroidRuntime(25249):    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)

Answer 1

当我们经历片段生命周期时，似乎片段再次从 onDestroyView() 调用时，无法调用 onCreateView()。所以我的建议是通过方法保存片段的实例

addToBackStack()

或使用

设置保留状态（真）

Answer 2

如果您拥有实现googleMap 所需的所有权限，请检查您的mainfaist 文件，请查看here。 如果所有权限都正常，请尝试更改您的代码，如下所示：

因为您在 selectItem 方法中使用 SupportMapFragment 并且您的变量 Fragment 包含 HomeFragment 类（其中是地图），所以您应该导入这个：

import android.support.v4.app.Fragment;

还有这一行：

 FragmentManager fragmentManager = getFragmentManager();

你应该改成：

FragmentManager fragmentManager = getSupportFragmentManager();

并导入：

import android.support.v4.app.FragmentManager;

原因与我上面提到的相同。

希望这会对你有所帮助。