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无法加载FragmentActivity，谷歌地图v 2

user3792510 发表于 Dev
8
用户3792510

我正在尝试在具有Android OS v 2.3.6的Android手机LG-E400上显示googlemaps v2。但是我得到了错误。我搜索了类似的问题，但是没有任何建议可以帮助我。

这是我的代码：

//MainActivity.java

import com.example.googlemaps2.R;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.widget.Toast;


public class MainActivity extends FragmentActivity {
   @Override
   protected void onCreate(Bundle savedInstanceState){

       super.onCreate(savedInstanceState);

       try{
       setContentView(R.layout.main); 

       SupportMapFragment mf = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);

       GoogleMap map = mf.getMap();
       } catch(Exception e){
           Toast.makeText(this,""+e.getMessage(),5000).show();
       }
   }
}

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"
    class="com.google.android.gms.maps.SupportMapFragment"/>

Manifest.xml

    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.googlemaps2"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="4"
        android:targetSdkVersion="19" />

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

    <permission
        android:name="com.example.googlemaps2.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission 
      android:name="com.example.googlemaps2.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" >

        <activity 
            android:name="com.example.googlemaps2.MainActivity"
            >
            <intent-filter>

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

        </activity>

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

    <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyBK_DUfmBFEae7F_O8xxxxxxxxxxxx" />

    </application>
</manifest>

当我运行它时，log cat会向我显示这些错误，并且程序被破坏了。

07-01 10:58:16.019: E/AndroidRuntime(5162): FATAL EXCEPTION: main
07-01 10:58:16.019: E/AndroidRuntime(5162): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.googlemaps2/com.example.googlemaps2.MainActivity}: java.lang.NullPointerException
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1658)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1674)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:942)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.os.Looper.loop(Looper.java:130)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.ActivityThread.main(ActivityThread.java:3735)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at java.lang.reflect.Method.invokeNative(Native Method)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at java.lang.reflect.Method.invoke(Method.java:507)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:662)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at dalvik.system.NativeStart.main(Native Method)
07-01 10:58:16.019: E/AndroidRuntime(5162): Caused by: java.lang.NullPointerException
07-01 10:58:16.019: E/AndroidRuntime(5162):     at loh.<init>(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at lol.<init>(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at lzr.<init>(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at mbi.a(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at lxn.a(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at lxm.a(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at fnb.onTransact(SourceFile:107)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.os.Binder.transact(Binder.java:279)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.google.android.gms.maps.internal.IMapFragmentDelegate$a$a.onCreateView(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.google.android.gms.maps.SupportMapFragment$a.onCreateView(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.google.android.gms.dynamic.a$4.b(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.google.android.gms.dynamic.a.a(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.google.android.gms.dynamic.a.onCreateView(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.google.android.gms.maps.SupportMapFragment.onCreateView(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1097)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:1895)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:566)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1129)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.Activity.performStart(Activity.java:3791)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1631)
07-01 10:58:16.019: E/AndroidRuntime(5162):     ... 11 more
07-01 10:58:16.019: E/AndroidRuntime(5162): [Blue Error Handler] Make Debugging Report file for main
07-01 10:58:16.019: E/AndroidRuntime(5162): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.googlemaps2/com.example.googlemaps2.MainActivity}: java.lang.NullPointerException
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1658)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1674)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:942)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.os.Looper.loop(Looper.java:130)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.ActivityThread.main(ActivityThread.java:3735)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at java.lang.reflect.Method.invokeNative(Native Method)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at java.lang.reflect.Method.invoke(Method.java:507)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:662)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at dalvik.system.NativeStart.main(Native Method)
07-01 10:58:16.019: E/AndroidRuntime(5162): Caused by: java.lang.NullPointerException
07-01 10:58:16.019: E/AndroidRuntime(5162):     at loh.<init>(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at lol.<init>(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at lzr.<init>(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at mbi.a(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at lxn.a(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at lxm.a(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at fnb.onTransact(SourceFile:107)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.os.Binder.transact(Binder.java:279)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.google.android.gms.maps.internal.IMapFragmentDelegate$a$a.onCreateView(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.google.android.gms.maps.SupportMapFragment$a.onCreateView(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.google.android.gms.dynamic.a$4.b(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.google.android.gms.dynamic.a.a(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.google.android.gms.dynamic.a.onCreateView(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at com.google.android.gms.maps.SupportMapFragment.onCreateView(Unknown Source)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1097)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:1895)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:566)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1129)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.Activity.performStart(Activity.java:3791)
07-01 10:58:16.019: E/AndroidRuntime(5162):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1631)
07-01 10:58:16.019: E/AndroidRuntime(5162):     ... 11 more

有人可以帮我吗？

用户3792510

看完控制台后，我提到apk的安装总是会失败，因为清单文件中的API级别不正确，因为它会自动运行，并且是昨天安装的旧apk。然后，当我从手机中删除所有旧的apk并在清单中写上合适的apk版本时，它向我显示了地图。

本文收集自互联网，转载请注明来源。

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