第二次打开SupportMapFragment时出错

Question

当第二次打开我的SupportMapFragment（Android maps v2)时（调用setContentView），我得到以下错误：

01-28 16:27:21.374: E/AndroidRuntime(32743): FATAL EXCEPTION: main
01-28 16:27:21.374: E/AndroidRuntime(32743): android.view.InflateException: Binary XML file line #6: Error inflating class fragment
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.view.View.inflate(View.java:16119)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at mypackage.MyView.<init>(HitsView.java:26)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at mypackage.MenuListFragment.onItemClick(MenuListFragment.java:133)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.widget.AdapterView.performItemClick(AdapterView.java:298)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.widget.AbsListView.performItemClick(AbsListView.java:1086)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:2855)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.widget.AbsListView$1.run(AbsListView.java:3529)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.os.Handler.handleCallback(Handler.java:615)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.os.Handler.dispatchMessage(Handler.java:92)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.os.Looper.loop(Looper.java:137)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.app.ActivityThread.main(ActivityThread.java:4745)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at java.lang.reflect.Method.invokeNative(Native Method)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at java.lang.reflect.Method.invoke(Method.java:511)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at dalvik.system.NativeStart.main(Native Method)
01-28 16:27:21.374: E/AndroidRuntime(32743): Caused by: java.lang.IllegalArgumentException: Binary XML file line #6: Duplicate id 0x7f04003b, tag null, or parent id 0x0 with another fragment for com.google.android.gms.maps.SupportMapFragment
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:285)
01-28 16:27:21.374: E/AndroidRuntime(32743):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
01-28 16:27:21.374: E/AndroidRuntime(32743):    ... 20 more

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:map="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <fragment
        android:id="@+id/hits_map"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        class="com.google.android.gms.maps.SupportMapFragment"
        map:mapType="normal"
        map:uiZoomControls="false"
        map:uiZoomGestures="true"
        map:cameraZoom="13"
        map:uiRotateGestures="true"
        map:uiTiltGestures="true"/>
</RelativeLayout>

public class MyView extends RelativeLayout {
    private GoogleMap map;

    public MyView(Context context, FragmentActivity activity) {
        super(context);
        inflate(activity, R.layout.activity_hits, this);
        this.map = ((SupportMapFragment) activity.getSupportFragmentManager()
            .findFragmentById(R.id.hits_map)).getMap();
    }
}

我不知道这个错误是什么意思。有人能解释一下吗？

Answer 1

不是在布局中声明de SupportMapFragment，而是通过编程方式进行，并确保使用getChildFragmentMananger而不是经典的getFragmentManager（）来创建片段。

  mMapFragment = SupportMapFragment.newInstance();
    FragmentTransaction fragmentTransaction =
             mMapFragment.getChildFragmentManager().beginTransaction();
     fragmentTransaction.add(R.id.map_root, mMapFragment);
     fragmentTransaction.commit(); 

保留这个SupportMapFragment mMapFragment，因为您需要它来检索GoogleMap对象：

  GoogleMap map = mMapFragment.getMap();