Unable instantiate android.gms.maps.MapFragment

Question

I try to do a demo with google maps android v2 with very simple activity, just copy code from google page: https://developers.google.com/maps/documentation/android/start#adding_the_api_key_to_your_application

for activity:

package com.example.mapdemo;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

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

for layout:

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/map"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  class="com.google.android.gms.maps.MapFragment"/>

I had apply for a api key according to page and modify my androidmanifest.xml file, just like this:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.wenhai.driverschool"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <uses-permission android:name="android.permission.INTERNET" />

    <!-- add for map2 -->
    <permission
        android:name="com.example.mapdemo.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission android:name="com.example.mapdemo.permission.MAPS_RECEIVE" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <!-- External storage for caching. -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <!-- Maps API needs OpenGL ES 2.0. -->
    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyDVAF4WaVSVRDKJx87It8OSFP5txQcPabc" />

        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

I also reference my app to google-play-services_lib in eclipse.

but everytime, error report in logcat like this:

2-05 16:22:53.609: E/AndroidRuntime(21623): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wenhai.driverschool/com.wenhai.driverschool.MainActivity}: android.view.InflateException: Binary XML file line #2: Error inflating class fragment
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.ActivityThread.access$600(ActivityThread.java:127)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.os.Looper.loop(Looper.java:137)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.ActivityThread.main(ActivityThread.java:4441)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at java.lang.reflect.Method.invokeNative(Native Method)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at java.lang.reflect.Method.invoke(Method.java:511)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at dalvik.system.NativeStart.main(Native Method)
12-05 16:22:53.609: E/AndroidRuntime(21623): Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class fragment
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:255)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Activity.setContentView(Activity.java:1835)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at com.wenhai.driverschool.MainActivity.onCreate(MainActivity.java:11)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Activity.performCreate(Activity.java:4465)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
12-05 16:22:53.609: E/AndroidRuntime(21623):    ... 11 more
12-05 16:22:53.609: E/AndroidRuntime(21623): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.google.android.gms.maps.MapFragment: make sure class name exists, is public, and has an empty constructor that is public
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Fragment.instantiate(Fragment.java:581)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Fragment.instantiate(Fragment.java:549)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Activity.onCreateView(Activity.java:4235)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:673)
12-05 16:22:53.609: E/AndroidRuntime(21623):    ... 20 more
12-05 16:22:53.609: E/AndroidRuntime(21623): Caused by: java.lang.ClassNotFoundException: com.google.android.gms.maps.MapFragment
12-05 16:22:53.609: E/AndroidRuntime(21623):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
12-05 16:22:53.609: E/AndroidRuntime(21623):    at android.app.Fragment.instantiate(Fragment.java:571)
12-05 16:22:53.609: E/AndroidRuntime(21623):    ... 23 more

I don't know the reason for this.

If i add google-play-services.jar into my project, it will report another error:

12-05 16:34:23.269: E/AndroidRuntime(22638): FATAL EXCEPTION: main
12-05 16:34:23.269: E/AndroidRuntime(22638): java.lang.NoClassDefFoundError: com.google.android.gms.R$styleable
12-05 16:34:23.269: E/AndroidRuntime(22638):    at com.google.android.gms.maps.GoogleMapOptions.createFromAttributes(Unknown Source)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at com.google.android.gms.maps.MapFragment.onInflate(Unknown Source)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.Activity.onCreateView(Activity.java:4242)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:673)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:255)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.Activity.setContentView(Activity.java:1835)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at com.wenhai.driverschool.MainActivity.onCreate(MainActivity.java:11)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.Activity.performCreate(Activity.java:4465)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.ActivityThread.access$600(ActivityThread.java:127)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.os.Looper.loop(Looper.java:137)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at android.app.ActivityThread.main(ActivityThread.java:4441)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at java.lang.reflect.Method.invokeNative(Native Method)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at java.lang.reflect.Method.invoke(Method.java:511)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
12-05 16:34:23.269: E/AndroidRuntime(22638):    at dalvik.system.NativeStart.main(Native Method)

Anyone can help me about this?

Answer 1

In IntelliJ IDEA (updated for IntelliJ 12):

1. Create a file ~/android-sdk/extras/google/google_play_services/libproject/google-play-services_lib/src/dummy.java containing class dummy {}.
2. File->Import Module-> ~/android-sdk/extras/google/google_play_services/libproject/google-play-services_lib
3. Create Module from Existing Sources
4. Next->Next->Next->Next->Finish
5. File->Project Structure->Modules->YourApp
6. +->Module Dependency->Google-play-services_lib (The + button is in the top right corner of the dialog.)
7. +->Jars or directories->~/android-sdk/extras/google/google_play_services/libproject/google-play-services_lib/libs/google-play-services.jar
8. Use the up/down arrows to move <Module source> to the bottom of the list.

You can delete dummy.java if you like.

Edit: After using this for a while I've found that there is a small flaw/bug. IDEA will sometimes complain about not being able to open a .iml project file in the google-play-services_lib directory, despite the fact that you never told it there was a project there. If that happens, rebuilding the project solves the problem, at least until it comes back.

Answer 2

Update

Please follow Commonsware MapV2 code snippets to get better understanding.

(It is present in Omnibus edition)

https://github.com/commonsguy/cw-omnibus/tree/master/MapsV2

Following snippet is working fine at my end.I choose to use SupportMapFragment.

Dont forget to add google-play-services.jar into your project.

MainActivity.java

package com.example.newmapview;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import com.google.android.gms.maps.SupportMapFragment;

public class MainActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        SupportMapFragment fragment = new SupportMapFragment();
        getSupportFragmentManager().beginTransaction()
                .add(android.R.id.content, fragment).commit();
    }
}

manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.newmapview"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="16" />

    <permission
        android:name="com.example.newmapview.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission android:name="com.example.newmapview.permission.MAPS_RECEIVE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.newmapview.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="XXXXX" />
    </application>

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />

</manifest>

Here is the result

Hope this will help.

Answer 3

Just try to replace your layout with :

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/map"
       android:name="com.google.android.gms.maps.SupportMapFragment"
       android:layout_width="wrap_content"
       android:layout_height="match_parent" />

You need to use the SupportMapFragment for API under 11 !

Aurel