Unable instantiate android.gms.maps.MapFragment

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.

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.

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

I faced the same problem ant it took me tow days to figure out a solution that worked for me :

1. Delete the project google-play-services_lib (right click on the project delete )
2. Delete the project containing the Google maps demo ( MainActivity in my case ) if you have one
3. Copy the project google-play-services_lib( extras\google\google_play_services\libproject\google-play-services_lib) into your workspace then import it as General project (File->import->existing projects into workspase )
4. Right click on your project ( in which you want to load the map ) -> Android -> add (under library ) google-play-services_lib

You should see something like this :

Note : You should not have something like this ( the project should be referred from your workspace ):

I think that the problem is that tow projects are referencing the same library