Google Maps MapFragment导致应用崩溃

Question

我对android编程很新,但我想做的事情似乎相当简单.我在操作栏中有4个不同的选项卡,第一个应显示带有谷歌地图API的片段,其他一些我尚未完成的其他东西.在线学习了一些教程之后,我设法获得了我想要的选项卡功能,并让地图显示出来.

从使用地图(选项卡1)的初始选项卡更改为任何其他应用程序时,该应用程序正常工作,但在尝试返回时崩溃.奇怪的是,当地图片段位于其中一个选项卡中时,它会使第二个选项卡在某些过渡时崩溃,在图像中,显示为蓝色箭头的过渡工作正常,而带有黄色箭头的过渡使应用程序崩溃.

http://imageshack.com/a/img839/4796/kf7w.png

如果我为其他一个更改了第一个选项卡片段,则所有转换都可以再次正常工作,因此我认为问题确实必须与地图片段有关.

我的代码如下:

MainActivity.java

public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private ActionBar actionBar;
private String[] tabs = null;

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

    viewPager = (ViewPager) findViewById(R.id.pager);
    actionBar = getActionBar();
    mAdapter = new TabsPagerAdapter(getSupportFragmentManager());

    viewPager.setAdapter(mAdapter);
    actionBar.setHomeButtonEnabled(false);
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    tabs = getResources().getStringArray(R.array.tab_names);
    for (String tab_name : tabs)
        actionBar.addTab(actionBar.newTab().setText(tab_name).setTabListener(this));

    /**
     * on swiping the viewpager make respective tab selected
     * */
    viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

        @Override
        public void onPageSelected(int position) {
            // on changing the page
            // make respected tab selected
            actionBar.setSelectedNavigationItem(position);
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
        }

        @Override
        public void onPageScrollStateChanged(int arg0) {
        }
    });
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
    // TODO Auto-generated method stub

}

@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
    viewPager.setCurrentItem(tab.getPosition());        
}

@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    // TODO Auto-generated method stub

}

}

TabsPagerAdapter.java

public class TabsPagerAdapter extends FragmentPagerAdapter {

public TabsPagerAdapter(FragmentManager fm) {
    super(fm);
}

@Override
public Fragment getItem(int index) {
    switch (index){
    case 0:
        return new GoogleMapsFragment();
    case 1:
        return new SampleFragment();
    case 2:
        return new ContactFragment();
    case 3:
        return new WhoFragment();
    default:
        Log.e("switch", "default");
    }
    return null;
}

@Override
public int getCount() {
     // get item count - equal to number of tabs
    return 4;
}

}

GoogleMapsFragment.java

public class GoogleMapsFragment extends Fragment {

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

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

    return rootView;
}

@Override
public void onDestroyView() {
    super.onDestroyView();
    Fragment f = (Fragment) getFragmentManager().findFragmentById(R.id.map);        
    if (f != null) {
        getFragmentManager().beginTransaction().remove(f).commit();
    }
}
}

和xml文件:

activity_main.xml中

<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity"

android:background="#ffff0000"
android:id="@+id/mainLayout"
android:tag="@+id/mainLayoutTag" >

<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:tag="pagerTag">
</android.support.v4.view.ViewPager>

</RelativeLayout>

activity_map.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="@+id/mapLayout"
android:tag="mapLayoutTag" >

<fragment android:id="@+id/map"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:name="com.google.android.gms.maps.MapFragment"
      android:tag="gMaps"/>


</RelativeLayout>

其他java类几乎是空的,其他xml文件只包含默认的RelativeLayout.

有什么建议我可以做些什么来解决这个问题？感谢您抽出时间阅读所有内容:)

编辑:忘记发生崩溃错误:

02-10 23:42:01.723: E/AndroidRuntime(7221): Caused by: 
java.lang.IllegalArgumentException: Binary XML file line #9: 
Duplicate id 0x7f05000a, tag gMaps, or parent id 0x7f050009 with another 
fragment for com.google.android.gms.maps.MapFragment

Answer 1

设法通过切换onDestroy()函数中超级调用的位置来解决这个问题.似乎我需要首先从其父级中销毁或取消分配片段以使其工作.onDestroy()如果有人仍然遇到同样的问题,那么继承新代码:

@Override
public void onDestroyView() {
    userMarker.remove();

    Fragment f = (Fragment) getFragmentManager().findFragmentById(R.id.map);        
    if (f != null) {
        getFragmentManager().beginTransaction().remove(f).commit();
    }

    super.onDestroyView();        
}