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

I wrote in the activity
import com.google.android.gms.maps.SupportMapFragment;

and Eclipse gave me the red icon > click > fix projec setup.. > add archive google-play-services.jar

And finnaly it worked!!

Answer 2

i had everything what everyone above was saying and resolved the error by simply calling the super.onCreate(savedInstanceState); as first instruction in oncreate method; before it was last line in method. :| wasted whole day.

Answer 3

To take care of the Drive-related imports, you'll need a few jars from the Google Drive SDK. There are a few large ones, so you may want to add them individually to suit your app.

If that doesn't resolve the com.google.android.gms.* imports, the Google Play Services add-on needs to be installed (from Extras -> Google Play Services in the SDK Manager) and google-play-services.jar needs to be added to your build path.

EDIT:

In this case, the following jars were needed:

google-api-services-drive-v2-rev1-1.7.2-beta.jar

google-http-client-1.10.3-beta.jar

google-http-client-android2-1.10.3-beta.jar

google-oauth-client-1.10.1-beta.jar

google-api-client-android2-1.10.3-beta.jar

google-api-client-1.10.3-beta.jar

Answer 4

I don't get the true solution but I solve it after doing these things:
- Tick 'Copy projects into workspace' when importing google-play-services_lib
- Don't set the minSdkVersion below 13
- If you get error with theme, try changing your layout theme to any system theme
- Re-create your project from scratch or revert everything if you get it from somewhere

Answer 5

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

Answer 6

In your MainActivity (or in each activity you want to put the v2 map) you must extend FragmentActivity or Activity either you want to use SupportMapFragment or just MapFragment. Use MapFragment class only if you are targeting API 12 and above. Otherwise, use SupportMapFragment. It's a subtle difference but it makes the error.