我试图在Android手机LG-E400上使用Android OS v 2.3.6显示googlemaps v2。 但我得到错误。我搜索了类似的问题,但没有任何建议帮助我。
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中
<?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"/>
的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会显示这些错误,并且程序被粉碎。
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
有人可以帮助我吗?
答案 0 :(得分:0)
在我看了一下控制台后,我提到apk的安装总是失败,因为清单中的API级别不对应,因为它自动运行,旧的apk,昨天安装。然后,当我从手机中删除所有旧的apks,并在清单中编写合适的apk版本时,它显示了我的地图。