MapFragment與抽屜式導航

我下面這個教程，使抽屜式導航：MapFragment與抽屜式導航

https://github.com/codepath/android_guides/wiki/Fragment-Navigation-Drawer

我的一個片段是如下定義的地圖：

XML

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

    <FrameLayout android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     > 
     /*Some texts and buttons */ 
    </FrameLayout> 
</RelativeLayout>

Java

public class MapsFragment extends Fragment implements AsyncResponse { 

    private View mView; 
    private GoogleMap mMap; 
    private LayoutInflater mInflater; 
    private Bundle savedInstanceState; 
    private CustomButton mCancelButton; 
    private CustomButton mPeekButton; 
    private boolean mActivityPaused; 


@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    mPeeks = new ArrayList(); 
    mGson = new Gson(); 
    mInflater = inflater; 
    mIsPaneOpen = false; 
    mMarkerMap = new HashMap(); 

    if (mView != null) { 
     ViewGroup parent = (ViewGroup) mView.getParent(); 
     if (parent != null) 
      parent.removeView(mView); 
     } 
     try { 
      mView = mInflater.inflate(R.layout.activity_maps, container, false); 
     } catch (InflateException e) { 
      e.printStackTrace(); 
     } 


     setUpMapIfNeeded(); 

     mCancelButton = (CustomButton) mView.findViewById(R.id.bt_cancel); 
     return mView; 

    } 

    public void setUpMapIfNeeded(){ 
     if (mMap == null){ 
      mMap = ((MapFragment) getActivity().getFragmentManager().findFragmentById(R.id.map)).getMap(); 
      if (mMap != null) 
       setUpMap(); 
     } 
    } 

    private void setUpMap() { 
     mMap.setMyLocationEnabled(true); 
     //Some code 
    } 
}

我自願刪除一些不相關的代碼。那麼我的主要活動：

XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical"> 

    <android.support.v4.widget.DrawerLayout 
      xmlns:android="http://schemas.android.com/apk/res/android" 
      xmlns:app="http://schemas.android.com/apk/res-auto" 
      android:id="@+id/drawer_layout" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent"> 

     <LinearLayout 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:orientation="vertical"> 

      <!-- The ActionBar --> 
      <include 
        layout="@layout/toolbar" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" /> 

      <!-- The main content view --> 
      <FrameLayout 
        android:id="@+id/flContent" 
        android:layout_width="match_parent" 
        android:layout_height="match_parent" /> 
     </LinearLayout> 

     <!-- The navigation drawer --> 
     <android.support.design.widget.NavigationView 
       android:id="@+id/nvView" 
       android:layout_width="wrap_content" 
       android:layout_height="match_parent" 
       android:layout_gravity="start" 
       android:background="@android:color/white" 
       app:menu="@menu/drawer_view" /> 
    </android.support.v4.widget.DrawerLayout> 
</LinearLayout>

的Java

public class MainActivity extends AppCompatActivity { 

    /** 
    * Fragment managing the behaviors, interactions and presentation of the navigation drawer. 
    */ 
    //Manager de Fragment 
    DrawerLayout mDrawer;         // Declaring DrawerLayout 
    Toolbar mToolbar; 
    Fragment currentFrag; 
    FragmentManager mFragmentManager; 
    Fragment mMapFragment; 
    Fragment mUserFragment; 
    Fragment mThirdFragment; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     mFragmentManager = getSupportFragmentManager(); 


     mMapFragment = new MapsFragment(); 
     mUserFragment = new UserFragment(); 
     mThirdFragment = new ThirdFragment(); 
     //Initializing the first Fragment 
     mFragmentManager.beginTransaction().replace(R.id.flContent, new MapsFragment()).commit(); 

     // Set a Toolbar to replace the ActionBar. 
     mToolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(mToolbar); 

     // Find our drawer view 
     mDrawer = (DrawerLayout) findViewById(R.id.drawer_layout); 

     // Set the menu icon instead of the launcher icon. 
     final ActionBar ab = getSupportActionBar(); 
     ab.setHomeAsUpIndicator(R.drawable.ic_menu); 
     ab.setDisplayHomeAsUpEnabled(true); 
     // Find our drawer view 
     NavigationView nvDrawer = (NavigationView) findViewById(R.id.nvView); 
     // Setup drawer view 
     setupDrawerContent(nvDrawer); 
    } 

    //First We Declare Titles And Icons For Our Navigation Drawer List View 
    //This Icons And Titles Are holded in an Array as you can see 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // The action bar home/up action should open or close the drawer. 
     switch (item.getItemId()) { 
      case android.R.id.home: 
       mDrawer.openDrawer(GravityCompat.START); 
       return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 

    @Override 
    protected void onPostCreate(Bundle savedInstanceState) { 
     super.onPostCreate(savedInstanceState); 
    } 
    private void setupDrawerContent(NavigationView navigationView) { 
     navigationView.setNavigationItemSelectedListener(
       new NavigationView.OnNavigationItemSelectedListener() { 
        @Override 
        public boolean onNavigationItemSelected(MenuItem menuItem) { 
         selectDrawerItem(menuItem); 
         return true; 
        } 
       }); 
    } 

    public void selectDrawerItem(MenuItem menuItem) { 
     // Create a new fragment and specify the planet to show based on 
     // position 

     Fragment fragment = null; 
     switch(menuItem.getItemId()) { 
      case R.id.nav_map: 
       fragment = mMapFragment; 
       break; 
      case R.id.nav_profile: 
       fragment = mUserFragment; 
       break; 
      case R.id.nav_nav_settings: 
       fragment = mThirdFragment; 
       break; 
      default: 
       fragment = mMapFragment; 
     } 

     // Insert the fragment by replacing any existing fragment 

     mFragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit(); 


     // Highlight the selected item, update the title, and close the drawer 
     menuItem.setChecked(true); 
     setTitle(menuItem.getTitle()); 
     mDrawer.closeDrawers(); 
    } 


}

的問題是，當我附上去MapFragment首次，沒有問題，活動顯示地圖。但是當我試圖通過導航抽屜去另一個片段，然後又回到了地圖片段我有這樣的例外：

07-19 16:04:25.710 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ android.view.InflateException: Binary XML file line #12: Error inflating class fragment 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:770) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.view.LayoutInflater.rInflate(LayoutInflater.java:813) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.view.LayoutInflater.inflate(LayoutInflater.java:511) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.view.LayoutInflater.inflate(LayoutInflater.java:415) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at fr.yougraph.homelesspasseul.fragment.MapsFragment.onCreateView(MapsFragment.java:93) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.support.v4.app.Fragment.performCreateView(Fragment.java:1789) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:955) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1138) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:740) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1501) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:458) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.os.Handler.handleCallback(Handler.java:739) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:95) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.os.Looper.loop(Looper.java:145) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5944) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:372) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1389) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1184) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ Caused by: java.lang.IllegalArgumentException: Binary XML file line #12: Duplicate id 0x7f0e0099, tag null, or parent id 0x7f0e0098 with another fragment for com.google.android.gms.maps.MapFragment 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2135) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.app.Activity.onCreateView(Activity.java:5610) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.support.v7.app.AppCompatDelegateImplV11.callActivityOnCreateView(AppCompatDelegateImplV11.java:41) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(AppCompatDelegateImplV7.java:826) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:44) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.view.LayoutInflater$FactoryMerger.onCreateView(LayoutInflater.java:181) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:732) 
07-19 16:04:25.720 12380-12380/fr.yougraph.homelesspasseul W/System.err﹕ ... 18 more 
07-19 16:04:25.740 12380-12380/fr.yougraph.homelesspasseul D/AndroidRuntime﹕ Shutting down VM 
07-19 16:04:25.740 12380-12380/fr.yougraph.homelesspasseul E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    Process: fr.yougraph.homelesspasseul, PID: 12380 
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference 
      at fr.yougraph.homelesspasseul.fragment.MapsFragment.onCreateView(MapsFragment.java:123) 
      at android.support.v4.app.Fragment.performCreateView(Fragment.java:1789) 
      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:955) 
      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1138) 
      at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:740) 
      at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1501) 
      at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:458) 
      at android.os.Handler.handleCallback(Handler.java:739) 
      at android.os.Handler.dispatchMessage(Handler.java:95) 
      at android.os.Looper.loop(Looper.java:145) 
      at android.app.ActivityThread.main(ActivityThread.java:5944) 
      at java.lang.reflect.Method.invoke(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:372) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1389) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1184)

第一個例外，因爲重複mapfragment，導致讓MView的空，我可以不執行findViewById。

我看不到我在哪裏錯了，我以前使用過尋呼機地帶，並且碎片之間的切換工作正常，所以地圖。

感謝您的幫助

順便說我想在這些問題給出解決方案：

Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragment

Error inflating class fragment: Duplicate id , tag null, or parent id with another fragment

無工作

來源

2015-07-19 A. Grima

我想重複來自：在MainActivity的onCreated中，調用setupDrawerContent，它調用selectDrawerItem ETS你的片段= mMapfragment默認，但以前在OnCreate中你已經創建了此行的另一個MapsFragment：。

mFragmentManager.beginTransaction（）代替（R.id.flContent，新 MapsFragment（））提交（）;

所以我的建議是嘗試改變初始化mMapFragment您已經聲明：

mFragmentManager.beginTransaction（）代替（R.id.flContent， mMapFragment）。承諾（）;

來源

2015-07-19 14:56:09

我剛試過你的解決方案，同樣的錯誤。但是我注意到一個變化，在你的解決方案之前，當我點擊Map的項目時（在地圖的第一次初始化之後），應用程序崩潰了，現在我可以重新點擊地圖的項目，沒有崩潰。但是，當我切換片段，然後返回到地圖，相同的錯誤 –

也許你正試圖訪問地圖之前，它顯示爲回答建議的以下鏈接： [android-map-in-fragment]（http： //stackoverflow.com/questions/20314635/android-map-in-fragment） – 2015-07-19 16:15:43

MapFragment與抽屜式導航

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