问题
I'm using google play services r14 and couldn't able to run the app on any device.
01-23 12:07:37.309: E/AndroidRuntime(7056): FATAL EXCEPTION: main
01-23 12:07:37.309: E/AndroidRuntime(7056): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mapstest/com.example.mapstest.MainActivity}: java.lang.NullPointerException
01-23 12:07:37.309: E/AndroidRuntime(7056): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2114)
01-23 12:07:37.309: E/AndroidRuntime(7056): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2139)
01-23 12:07:37.309: E/AndroidRuntime(7056): at android.app.ActivityThread.access$700(ActivityThread.java:143)
01-23 12:07:37.309: E/AndroidRuntime(7056): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1241)
01-23 12:07:37.309: E/AndroidRuntime(7056): at android.os.Handler.dispatchMessage(Handler.java:99)
01-23 12:07:37.309: E/AndroidRuntime(7056): at android.os.Looper.loop(Looper.java:137)
01-23 12:07:37.309: E/AndroidRuntime(7056): at android.app.ActivityThread.main(ActivityThread.java:4963)
01-23 12:07:37.309: E/AndroidRuntime(7056): at java.lang.reflect.Method.invokeNative(Native Method)
01-23 12:07:37.309: E/AndroidRuntime(7056): at java.lang.reflect.Method.invoke(Method.java:511)
01-23 12:07:37.309: E/AndroidRuntime(7056): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
01-23 12:07:37.309: E/AndroidRuntime(7056): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
01-23 12:07:37.309: E/AndroidRuntime(7056): at dalvik.system.NativeStart.main(Native Method)
01-23 12:07:37.309: E/AndroidRuntime(7056): Caused by: java.lang.NullPointerException
01-23 12:07:37.309: E/AndroidRuntime(7056): at com.example.mapstest.MainActivity.onCreate(MainActivity.java:25)
01-23 12:07:37.309: E/AndroidRuntime(7056): at android.app.Activity.performCreate(Activity.java:5184)
01-23 12:07:37.309: E/AndroidRuntime(7056): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
01-23 12:07:37.309: E/AndroidRuntime(7056): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2078)
01-23 12:07:37.309: E/AndroidRuntime(7056): ... 11 more
My Mainfest.xml code:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mapstest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="18" />
<permission
android:name="com.example.mapstest.permission.MAPS_RECEIVE"
android:protectionLevel="signature"></permission>
<uses-permission
android:name="com.example.mapstest.permission.MAPS_RECEIVE"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<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-feature
android:glEsVersion="0x00020000"
android:required="true"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme"
android:debuggable="true" >
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="api_key"/>
<meta-data android:name="com.google.android.gms.version"
android:value="4132500" />
<activity
android:name="com.example.mapstest.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>
</application>
MainActivity.java :
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import android.os.Bundle;
import android.app.Activity;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
public class MainActivity extends FragmentActivity {
private static GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
final LatLng CIU = new LatLng(35.21843892856462, 33.41662287712097);
Marker ciu = mMap.addMarker(new MarkerOptions()
.position(CIU).title("My Office"));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
activity_main.xml :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment"/>
</RelativeLayout>
Done all settings for google play services. Does these error occurs because of google play service version? If this is the reason, how to change google play service revision 14 to 10? Any Solutions?
回答1:
Use Something like this:
1. Update the google play services in the SDK.
2. Manually uninstall the App from device and restart the device. i have tried it and its going perfectly bro
Also do one thing get the new api key to edited the new sh1 code from https://code.google.com/apis/console/
you can get your sh1 code from window- preference-android-buid
回答2:
Your mMap is null. Try to use SupportMapFragment in layout and use getSupportFragmentManager() in code, like this:
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.SupportMapFragment"/>
and this code:
mMap = ((SupportMapFragment)getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
回答3:
In your Android Manifest you have not specified
<uses-library
android:name="com.google.android.maps" />
use android:name instead of android:class.Thus change the fragment in your layout as below
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.SupportMapFragment"/>
and use this in your java file to define mMap
mMap = ((SupportMapFragment)getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
来源：https://stackoverflow.com/questions/21301544/error-running-google-maps-api-v2