谷歌地图在另一个片段 - 错误调用getMapAsync时 [英] Google map inside another fragment - Error when calling getMapAsync

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问题描述

我想转换一个谷歌地图的活动为将在NavigationView被称为片段内工作。
该地图显示，但是当我用code getMapAsync 

  mFragment =（SupportMapFragment）getChildFragmentManager（）findFragmentById（R.id.map）。
mFragment.getMapAsync（本）;

我得到一个错误信息

  E / AndroidRuntime：致命异常：主要
E / AndroidRuntime：显示java.lang.NullPointerException
E / AndroidRuntime：在com.sample.samplemap.samplemapFragment.onCreate（samplemapFragment.java:32）
E / AndroidRuntime：在android.support.v4.app.Fragment.performCreate（Fragment.java:1942）
E / AndroidRuntime：在android.support.v4.app.FragmentManagerImpl.moveToState（FragmentManager.java:1040）
E / AndroidRuntime：在android.support.v4.app.FragmentManagerImpl.moveToState（FragmentManager.java:1259）
E / AndroidRuntime：在android.support.v4.app.BackStackRecord.run（BackStackRecord.java:738）
E / AndroidRuntime：在android.support.v4.app.FragmentManagerImpl.execPendingActions（FragmentManager.java:1624）
E / AndroidRuntime：在android.support.v4.app.FragmentManagerImpl $ 1.run（FragmentManager.java:517）
E / AndroidRuntime：在android.os.Handler.handleCallback（Handler.java:725）
E / AndroidRuntime：在android.os.Handler.dispatchMessage（Handler.java:92）
E / AndroidRuntime：在android.os.Looper.loop（Looper.java:137）
E / AndroidRuntime：在android.app.ActivityThread.main（ActivityThread.java:5306）
E / AndroidRuntime：在java.lang.reflect.Method.invokeNative（本机方法）
E / AndroidRuntime：在java.lang.reflect.Method.invoke（Method.java:511）
E / AndroidRuntime：在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1102）
E / AndroidRuntime：在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:869）
E / AndroidRuntime：在dalvik.system.NativeStart.main（本机方法）

samplemapFragment.java 

 包com.sample.samplemap;进口android.os.Bundle;
进口android.support.v4.app.Fragment;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口com.google.android.gms.maps.GoogleMap;
进口com.google.android.gms.maps.OnMa preadyCallback;
进口com.google.android.gms.maps.SupportMapFragment;公共类samplemapFragment扩展片段实现OnMa $ P $ {padyCallback
    GoogleMap的mGoogleMap;
    SupportMapFragment mFragment;    公共samplemapFragment（）{
        需要空公共构造
    }    @覆盖
    公共无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        mFragment =（SupportMapFragment）getChildFragmentManager（）findFragmentById（R.id.map）。
        mFragment.getMapAsync（本）;
    }    @覆盖
    公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，捆绑savedInstanceState）{
        //充气的布局该片段
        返回inflater.inflate（R.layout.fragment_sample_map，集装箱，FALSE）;
    }    @覆盖
    公共无效onMa pready（GoogleMap的GoogleMap的）{        mGoogleMap = GoogleMap的;
        mGoogleMap.setMyLocationEnabled（真）;
    }
}

fragment_sample_map.xml 

 ＆LT; RelativeLayout的
机器人：layout_height =match_parent
机器人：layout_width =match_parent
的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
工具：上下文=com.sample.samplemap.samplemapFragment
的xmlns：工具=htt​​p://schemas.android.com/tool​​s＆GT;
    ＆LT;片段的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns：地图=htt​​p://schemas.android.com/apk/res-auto的android：layout_width =384dp
    机器人：layout_height =300dp机器人：ID =@ + ID /图
    机器人：名字=com.google.android.gms.maps.SupportMapFragment
    机器人：layout_marginTop =44dp
    机器人：layout_alignParentTop =真
    机器人：layout_alignParentStart =真/＆GT;
＆LT; / RelativeLayout的＆GT;


解决方案

我已签该片段的生命周期是：
<一href=\"https://developer.xamarin.com/guides/android/platform_features/fragments/part_1_-_creating_a_fragment/Images/fragment_lifecycle.png\" rel=\"nofollow\">https://developer.xamarin.com/guides/android/platform_features/fragments/part_1_-_creating_a_fragment/Images/fragment_lifecycle.png

在OnCreate会先打电话，然后OnCreateView。

正如我已经实现了code你在这里工作正常图形页面：

MapCheckingActivity.java 

 包com.ramesh.expandablelistview;进口android.os.Bundle;
进口android.support.v7.app.AppCompatActivity;
进口android.support.v7.widget.Toolbar;公共类MapCheckingActivity扩展AppCompatActivity {    @覆盖
    保护无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_map_checking）;
        工具条工具栏=（栏）findViewById（R.id.toolbar）;
        setSupportActionBar（工具栏）;
        getSupportFragmentManager（）调用BeginTransaction（）
                .replace（R.id.content_frame，
                        新SampleMapFragment（））提交（）。
    }}

SampleMapFragment.java 

 包com.ramesh.expandablelistview;/ **
 *创建者拉梅什·库马尔在2016年2月17日。
 * /
进口android.os.Bundle;
进口android.support.v4.app.Fragment;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;进口com.google.android.gms.maps.GoogleMap;
进口com.google.android.gms.maps.MapView;
进口com.google.android.gms.maps.MapsInitializer;
进口com.google.android.gms.maps.OnMa preadyCallback;
公共类SampleMapFragment扩展片段器具
        OnMa $ P $ {padyCallback
    GoogleMap的mGoogleMap;
    MapView类MapView类;    查看MView的;    @覆盖
    公共无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        MapsInitializer.initialize（的getContext（））;
    }    @覆盖
    公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，捆绑savedInstanceState）{
//充气的布局该片段
        MVIEW = inflater.inflate（R.layout.fragment_map，集装箱，FALSE）;
        返回MView的;
    }    @覆盖
    公共无效onViewCreated（查看视图，捆绑savedInstanceState）{
        super.onViewCreated（查看，savedInstanceState）;
        图形页面=（图形页面）mView.findViewById（R.id.map）;
        如果（图形页面！= NULL）{
            //初始化的MapView
            mapView.onCreate（NULL）;
            mapView.onResume（）;
            //设置地图准备的回调接收GoogleMap对象
            mapView.getMapAsync（本）;
        }    }    @覆盖
    公共无效onMa pready（GoogleMap的GoogleMap的）{
        MapsInitializer.initialize（的getContext（））;        mGoogleMap = GoogleMap的;
        mGoogleMap.setMyLocationEnabled（真）;
    }}

activity_map_checking.xml：

 ＆LT;？XML版本=1.0编码=UTF-8＆GT？;
＆LT; android.support.design.widget.CoordinatorLayout
    的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns：程序=htt​​p://schemas.android.com/apk/res-auto
    的xmlns：工具=htt​​p://schemas.android.com/tool​​s的android：layout_width =match_parent
    机器人：layout_height =match_parent机器人：fitsSystemWindows =真
    工具：上下文=com.ramesh.expandablelistview.MapCheckingActivity＆GT;    ＆LT; android.support.design.widget.AppBarLayout机器人：layout_height =WRAP_CONTENT
        机器人：layout_width =match_parent安卓主题=@风格/ AppTheme.AppBarOverlay＆GT;        ＆LT; android.support.v7.widget.Toolbar机器人：ID =@ + ID /工具栏
            机器人：layout_width =match_parent机器人：layout_height =？ATTR / actionBarSize
            ？ATTR / colorPrimary：Android的背景=应用：popupTheme =@风格/ AppTheme.PopupOverlay/＆GT;    ＆LT; /android.support.design.widget.AppBarLayout>    ＆LT;包括布局=@布局/ content_map_checking/＆GT;    ＆LT; android.support.design.widget.FloatingActionButton机器人：ID =@ + ID / FAB
        机器人：layout_width =WRAP_CONTENT机器人：layout_height =WRAP_CONTENT
        机器人：layout_gravity =底部|结束机器人：layout_margin =@扪/ fab_margin
        机器人：SRC =@机器人：可绘制/ ic_dialog_email/＆GT;＆LT; /android.support.design.widget.CoordinatorLayout>

content_map_checking.xml：

 ＆LT;？XML版本=1.0编码=UTF-8＆GT？;
＆LT;的RelativeLayout的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns：工具=htt​​p://schemas.android.com/tool​​s
    的xmlns：程序=htt​​p://schemas.android.com/apk/res-auto的android：layout_width =match_parent
    机器人：layout_height =match_parent机器人：paddingLeft =@扪/ activity_horizo​​ntal_margin
    机器人：paddingRight =@扪/ activity_horizo​​ntal_margin
    机器人：paddingTop =@扪/ activity_vertical_margin
    机器人：paddingBottom会=@扪/ activity_vertical_margin
    应用：layout_behavior =@字符串/ appbar_scrolling_view_behavior
    工具：舒=@布局/ activity_map_checking
    工具：上下文=com.ramesh.expandablelistview.MapCheckingActivity＆GT;
    ＆LT;的FrameLayout
        机器人：layout_width =match_parent
        机器人：layout_height =match_parent
        机器人：ID =@ + ID / content_frame/＆GT;＆LT; / RelativeLayout的＆GT;

fragment_map.xml：

 ＆LT; RelativeLayout的
    的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns：工具=htt​​p://schemas.android.com/tool​​s
    机器人：layout_width =match_parent
    机器人：layout_height =match_parent
    工具：上下文=com.sample.samplemap.samplemapFragment＆GT;    ！＆LT;  - ＆LT;片段的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android - ＆GT;
    ＆LT;  - 的xmlns：地图=htt​​p://schemas.android.com/apk/res-auto的android：layout_width =384dp - ＆GT;
    ＆LT;  - 安卓！layout_height =300dp机器人：ID =@ + ID /图 - ＆GT;
    ＆LT;  - 机器人：名字=com.google.android.gms.maps.SupportMapFragment - ＆GT;
    ！＆LT;  - 机器人：layout_marginTop =44dp - ＆GT;
    ！＆LT;  - 机器人：layout_alignParentTop =真/＆GT;  - ＆GT;    ＆LT; com.google.android.gms.maps.MapView
        机器人：ID =@ + ID /图机器人：layout_marginTop =44dp
        机器人：layout_width =384dp机器人：layout_height =300dp/＆GT;
＆LT; / RelativeLayout的＆GT;

在这里输入的形象描述

我在由图形页面片断创建地图。

在Menifest：

 ＆LT;元数据
            机器人：名字=com.google.android.maps.v2.API_KEY
            机器人：值=@字符串/ google_maps_key/＆GT;
        ＆所述;元数据
            机器人：名字=com.google.android.gms.version
            机器人：值=@整数/ GOOGLE_PLAY_SERVICES_VERSION/＆GT;

地图没有显示，因为HashKey我进入错误
如果有帮助，然后接受它作为回答。
谢谢

I'm trying to convert a google map activity to work inside a fragment that will be called in NavigationView. The map is showing but when i used the code getMapAsync 

mFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);
mFragment.getMapAsync(this);

I got an error message 

E/AndroidRuntime: FATAL EXCEPTION: main
E/AndroidRuntime: java.lang.NullPointerException
E/AndroidRuntime: at com.sample.samplemap.samplemapFragment.onCreate(samplemapFragment.java:32)
E/AndroidRuntime: at android.support.v4.app.Fragment.performCreate(Fragment.java:1942)
E/AndroidRuntime: at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1040)
E/AndroidRuntime: at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1259)
E/AndroidRuntime: at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)
E/AndroidRuntime: at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1624)
E/AndroidRuntime: at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:517)
E/AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:725)
E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:92)
E/AndroidRuntime: at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5306)
E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)

samplemapFragment.java 

package  com.sample.samplemap;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;

public class samplemapFragment extends Fragment implements OnMapReadyCallback {
    GoogleMap mGoogleMap;
    SupportMapFragment mFragment;

    public samplemapFragment() {
        Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);         
        mFragment.getMapAsync(this);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        //Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_sample_map, container, false);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {

        mGoogleMap = googleMap;
        mGoogleMap.setMyLocationEnabled(true);
    }
}

fragment_sample_map.xml 

<RelativeLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
tools:context="com.sample.samplemap.samplemapFragment"
xmlns:tools="http://schemas.android.com/tools">
    <fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:map="http://schemas.android.com/apk/res-auto" android:layout_width="384dp"
    android:layout_height="300dp" android:id="@+id/map"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_marginTop="44dp"
    android:layout_alignParentTop="true"
    android:layout_alignParentStart="true" /> 
</RelativeLayout>

解决方案

I have checked that the LifeCycle of the Fragment is: https://developer.xamarin.com/guides/android/platform_features/fragments/part_1_-_creating_a_fragment/Images/fragment_lifecycle.png

OnCreate will Call First then OnCreateView.

As I have implemented code for you that works fine here with MapView:

MapCheckingActivity.java

package com.ramesh.expandablelistview;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;

public class MapCheckingActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_map_checking);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportFragmentManager().beginTransaction()
                .replace(R.id.content_frame,
                        new SampleMapFragment()).commit();
    }

}

SampleMapFragment.java

package com.ramesh.expandablelistview;

/**
 * Created by Ramesh Kumar on 2/17/2016.
 */


import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.MapsInitializer;
import com.google.android.gms.maps.OnMapReadyCallback;


public class SampleMapFragment extends Fragment implements
        OnMapReadyCallback {


    GoogleMap mGoogleMap;
    MapView mapView;

    View mView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        MapsInitializer.initialize(getContext());
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
//        Inflate the layout for this fragment
        mView = inflater.inflate(R.layout.fragment_map, container, false);
        return mView;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        mapView = (MapView) mView.findViewById(R.id.map);
        if (mapView != null) {
            // Initialise the MapView
            mapView.onCreate(null);
            mapView.onResume();
            // Set the map ready callback to receive the GoogleMap object
            mapView.getMapAsync(this);
        }

    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        MapsInitializer.initialize(getContext());

        mGoogleMap = googleMap;
        mGoogleMap.setMyLocationEnabled(true);


    }

}

activity_map_checking.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:fitsSystemWindows="true"
    tools:context="com.ramesh.expandablelistview.MapCheckingActivity">

    <android.support.design.widget.AppBarLayout android:layout_height="wrap_content"
        android:layout_width="match_parent" android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar android:id="@+id/toolbar"
            android:layout_width="match_parent" android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_map_checking" />

    <android.support.design.widget.FloatingActionButton android:id="@+id/fab"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin"
        android:src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

content_map_checking.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:showIn="@layout/activity_map_checking"
    tools:context="com.ramesh.expandablelistview.MapCheckingActivity">


    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/content_frame"/>

</RelativeLayout>

fragment_map.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"
    tools:context="com.sample.samplemap.samplemapFragment">

    <!--<fragment xmlns:android="http://schemas.android.com/apk/res/android"-->
    <!--xmlns:map="http://schemas.android.com/apk/res-auto" android:layout_width="384dp"-->
    <!--android:layout_height="300dp" android:id="@+id/map"-->
    <!--android:name="com.google.android.gms.maps.SupportMapFragment"-->
    <!--android:layout_marginTop="44dp"-->
    <!--android:layout_alignParentTop="true" />-->

    <com.google.android.gms.maps.MapView
        android:id="@+id/map"  android:layout_marginTop="44dp"
        android:layout_width="384dp" android:layout_height="300dp"/>
</RelativeLayout>

I have created map with in the Fragment by MapView.

In Menifest:

<meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="@string/google_maps_key" />
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />

Map is not showing because of HashKey I entered wrong If it helps then Accept it as Answer. Thanks

这篇关于谷歌地图在另一个片段 - 错误调用getMapAsync时的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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