问题
I have made an app that uses Google Android Maps API V2 and I have followed every step in the guide provided by Google but it doesn't work unfortunely and it crashes every time I try to start it up. So I'm wondering what is the problem?
MainActivity.java
package com.android.maptest;
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.activity_main);
}
}
activity_main.xml
<?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"
android:name="com.google.android.gms.maps.MapFragment"/>
Maptest Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.maptest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="16" />
<permission
android:name="com.android.maptest.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<uses-permission android:name="com.android.maptest.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme"
android:debuggable="true" >
<activity
android:name="com.android.maptest.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="api_key" />
</application>
</manifest>
Logcat
03-12 09:46:13.150: D/AndroidRuntime(1547): Shutting down VM
03-12 09:46:13.150: W/dalvikvm(1547): threadid=1: thread exiting with uncaught exception (group=0x410e22a0)
03-12 09:46:13.155: E/AndroidRuntime(1547): FATAL EXCEPTION: main
03-12 09:46:13.155: E/AndroidRuntime(1547): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.maptest/com.android.maptest.MainActivity}: android.view.InflateException: Binary XML file line #2: Error inflating class fragment
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
03-12 09:46:13.155: E/AndroidRuntime(1547): at
android.app.ActivityThread.access$600(ActivityThread.java:140)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.os.Handler.dispatchMessage(Handler.java:99)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.os.Looper.loop(Looper.java:137)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.app.ActivityThread.main(ActivityThread.java:4898)
03-12 09:46:13.155: E/AndroidRuntime(1547): at java.lang.reflect.Method.invokeNative(Native Method)
03-12 09:46:13.155: E/AndroidRuntime(1547): at java.lang.reflect.Method.invoke(Method.java:511)
03-12 09:46:13.155: E/AndroidRuntime(1547): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
03-12 09:46:13.155: E/AndroidRuntime(1547): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
03-12 09:46:13.155: E/AndroidRuntime(1547): at dalvik.system.NativeStart.main(Native Method)
03-12 09:46:13.155: E/AndroidRuntime(1547): Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class fragment
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
03-12 09:46:13.155: E/AndroidRuntime(1547): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:308)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.app.Activity.setContentView(Activity.java:1924)
03-12 09:46:13.155: E/AndroidRuntime(1547): at com.android.maptest.MainActivity.onCreate(MainActivity.java:11)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.app.Activity.performCreate(Activity.java:5206)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1083)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
03-12 09:46:13.155: E/AndroidRuntime(1547): ... 11 more
03-12 09:46:13.155: E/AndroidRuntime(1547): Caused by: android.app.Fragment$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
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.app.Fragment.instantiate(Fragment.java:584)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.app.Fragment.instantiate(Fragment.java:552)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.app.Activity.onCreateView(Activity.java:4849)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
03-12 09:46:13.155: E/AndroidRuntime(1547): ... 20 more
03-12 09:46:13.155: E/AndroidRuntime(1547): Caused by: java.lang.ClassNotFoundException: com.google.android.gms.maps.MapFragment
03-12 09:46:13.155: E/AndroidRuntime(1547): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
03-12 09:46:13.155: E/AndroidRuntime(1547): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
03-12 09:46:13.155: E/AndroidRuntime(1547): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
03-12 09:46:13.155: E/AndroidRuntime(1547): at android.app.Fragment.instantiate(Fragment.java:574)
03-12 09:46:13.155: E/AndroidRuntime(1547): ... 23 more
03-12 09:51:21.560: I/Process(1547): Sending signal. PID: 1547 SIG: 9
回答1:
Here a blog post I wrote on how to integrate Google Maps into you application:
Creating Google Map Application
From your error it look like you did not perform correctly steps 2-3 of the blog guide, for adding Google Play services library into your application.
If you follow carefully the steps written in the guide you will end up with the end result you can see at the end of the post.
回答2:
I assumed that you have already get Google Maps Android API v2 key and have Google Play services. If you not have already installed it then please follow below steps to solve this problem_
Step 1. you can found it in
Android SDK ManagerunderExtrastick check box of -Google Play services install it and after complete installation, restart your Eclipse.Step 2. Add library named_
google-play-services_libfound under theextrasfolder of your Android SDK setup folder to your Android project_
Path of google service lib_
{Your_Android_SDK_direct}\extras\google\google_play_services\libproject\google-play-services_lib
Ex. Location of this lib on My system_
C:\Program Files\Android\android-sdk\extras\google\google_play_services\libproject\google-play-services_lib
I hope this will solve your ploblem.
回答3:
For me adding:
import com.google.android.gms.maps.SupportMapFragment;
And changing the xml to
<fragment
android:name="com.google.android.gms.maps.SupportMapFragment"
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/header" />
resolved the problem. I hope you resolve it too!
回答4:
Looks like you didn't add the Google Play Services library to your project.
It's located at {Android SDK}\extras\google\google_play_services
Add it as Android Library Project to Eclipse and then add it to your project.
来源：https://stackoverflow.com/questions/15356981/android-maps-v2-app-crashing