我想在我的Android应用中使用Google地图，但每次运行应用时都会收到此错误，并且没有地图显示 E / Google Maps Android API：无法加载地图。联系Google服务器时出错这可能是身份验证问题（但可能是由于网络错误）。
我已尝试过互联网上的所有解决方案， 我更改了API_Key，在运行之前卸载了应用程序，添加了所有可能的标签到清单，但谷歌地图没有显示。
当我从互联网上下载样本并让它运行时，但是当我尝试将活动添加到我的原始应用程序时，我得到相同的错误而没有显示地图。
我在manifest，build.gradle和map活动中附加了代码。 我还附上了Logcat和手机的图片
我希望有人能把我放在正确的方向上
//Logcat
03-25 12:18:33.569 1877-1877/com.comp.roadmap.dev I/art﹕ Not late-enabling -Xcheck:jni (already on)
03-25 12:18:33.917 1877-1889/com.comp.roadmap.dev I/art﹕ Background sticky concurrent mark sweep GC freed 1760(106KB) AllocSpace objects, 0(0B) LOS objects, 0% free, 729KB/729KB, paused 2.270ms total 114.494ms
03-25 12:18:34.323 1877-1896/com.comp.roadmap.dev D/OpenGLRenderer﹕ Render dirty regions requested: true
03-25 12:18:34.325 1877-1877/com.comp.roadmap.dev D/﹕ HostConnection::get() New Host Connection established 0xa6d9fa00, tid 1877
03-25 12:18:34.332 1877-1877/com.comp.roadmap.dev D/Atlas﹕ Validating map...
03-25 12:18:34.423 1877-1897/com.comp.roadmap.dev D/Exception﹕ java.net.UnknownHostException: Unable to resolve host "webservice.pollsdb.com": No address associated with hostname
--------- beginning of crash
03-25 12:18:34.423 1877-1897/com.comp.roadmap.dev E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
Process: com.comp.roadmap.dev, PID: 1877
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
at java.io.StringReader.<init>(StringReader.java:47)
at com.comp.roadmap.app.login$CheckLoginWSTask.doInBackground(login.java:330)
at com.comp.roadmap.app.login$CheckLoginWSTask.doInBackground(login.java:295)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
03-25 12:18:34.428 1877-1896/com.comp.roadmap.dev D/﹕ HostConnection::get() New Host Connection established 0xa6d9fd80, tid 1896
03-25 12:18:34.454 1877-1896/com.comp.roadmap.dev I/OpenGLRenderer﹕ Initialized EGL, version 1.4
03-25 12:18:34.482 1877-1896/com.comp.roadmap.dev D/OpenGLRenderer﹕ Enabling debug mode 0
03-25 12:18:34.502 1877-1896/com.comp.roadmap.dev W/EGL_emulation﹕ eglSurfaceAttrib not implemented
03-25 12:18:34.502 1877-1896/com.comp.roadmap.dev W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa6db56e0, error=EGL_SUCCESS
03-25 12:18:34.573 1877-1896/com.comp.roadmap.dev W/EGL_emulation﹕ eglSurfaceAttrib not implemented
03-25 12:18:34.573 1877-1896/com.comp.roadmap.dev W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa6db5700, error=EGL_SUCCESS
03-25 12:18:34.734 1877-1889/com.comp.roadmap.dev I/art﹕ Background sticky concurrent mark sweep GC freed 961(70KB) AllocSpace objects, 0(0B) LOS objects, 10% free, 1521KB/1704KB, paused 726us total 123.706ms
03-25 12:18:34.932 1877-1889/com.comp.roadmap.dev I/art﹕ Background partial concurrent mark sweep GC freed 692(36KB) AllocSpace objects, 0(0B) LOS objects, 25% free, 1492KB/2004KB, paused 1.413ms total 112.221ms
03-25 12:18:35.308 1877-1877/com.comp.roadmap.dev I/Choreographer﹕ Skipped 41 frames! The application may be doing too much work on its main thread.
03-25 12:18:35.815 1877-1877/com.comp.roadmap.dev E/WindowManager﹕ android.view.WindowLeaked: Activity com.comp.roadmap.app.login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{1f1f0dc6 V.E..... R......D 0,0-684,322} that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:363)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:261)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.Dialog.show(Dialog.java:298)
at com.comp.roadmap.app.login$CheckLoginWSTask.onPreExecute(login.java:447)
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
at android.os.AsyncTask.execute(AsyncTask.java:535)
at com.comp.roadmap.app.login.LogMeIn(login.java:282)
at com.comp.roadmap.app.login.onCreate(login.java:145)
at android.app.Activity.performCreate(Activity.java:5937)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
03-25 12:18:47.249 1877-1897/com.comp.roadmap.dev I/Process﹕ Sending signal. PID: 1877 SIG: 9
03-25 12:18:59.919 2114-2126/com.comp.roadmap.dev I/art﹕ Background sticky concurrent mark sweep GC freed 2967(141KB) AllocSpace objects, 2(32KB) LOS objects, 0% free, 1254KB/1254KB, paused 1.542ms total 158.227ms
03-25 12:19:00.023 2114-2130/com.comp.roadmap.dev D/OpenGLRenderer﹕ Render dirty regions requested: true
03-25 12:19:00.028 2114-2114/com.comp.roadmap.dev D/﹕ HostConnection::get() New Host Connection established 0xa60ed060, tid 2114
03-25 12:19:00.046 2114-2114/com.comp.roadmap.dev D/Atlas﹕ Validating map...
03-25 12:19:00.142 2114-2130/com.comp.roadmap.dev D/﹕ HostConnection::get() New Host Connection established 0xa60a4a60, tid 2130
03-25 12:19:00.160 2114-2130/com.comp.roadmap.dev I/OpenGLRenderer﹕ Initialized EGL, version 1.4
03-25 12:19:00.198 2114-2130/com.comp.roadmap.dev D/OpenGLRenderer﹕ Enabling debug mode 0
03-25 12:19:00.238 2114-2130/com.comp.roadmap.dev W/EGL_emulation﹕ eglSurfaceAttrib not implemented
03-25 12:19:00.238 2114-2130/com.comp.roadmap.dev W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa60c5200, error=EGL_SUCCESS
03-25 12:19:00.313 2114-2130/com.comp.roadmap.dev W/EGL_emulation﹕ eglSurfaceAttrib not implemented
03-25 12:19:00.313 2114-2130/com.comp.roadmap.dev W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa60c5220, error=EGL_SUCCESS
03-25 12:19:00.653 2114-2114/com.comp.roadmap.dev I/Choreographer﹕ Skipped 34 frames! The application may be doing too much work on its main thread.
03-25 12:19:00.732 2114-2126/com.comp.roadmap.dev I/art﹕ Background sticky concurrent mark sweep GC freed 3217(193KB) AllocSpace objects, 0(0B) LOS objects, 10% free, 1609KB/1801KB, paused 12.515ms total 36.928ms
03-25 12:19:01.149 2114-2130/com.comp.roadmap.dev W/EGL_emulation﹕ eglSurfaceAttrib not implemented
03-25 12:19:01.149 2114-2130/com.comp.roadmap.dev W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa60c5200, error=EGL_SUCCESS
03-25 12:19:01.339 2114-2114/com.comp.roadmap.dev I/zzx﹕ Making Creator dynamically
03-25 12:19:01.372 2114-2114/com.comp.roadmap.dev W/ResourcesManager﹕ Asset path '/system/framework/com.android.media.remotedisplay.jar' does not exist or contains no resources.
03-25 12:19:01.372 2114-2114/com.comp.roadmap.dev W/ResourcesManager﹕ Asset path '/system/framework/com.android.location.provider.jar' does not exist or contains no resources.
03-25 12:19:01.448 2114-2114/com.comp.roadmap.dev I/Google Maps Android API﹕ Google Play services client version: 7095000
03-25 12:19:01.499 2114-2126/com.comp.roadmap.dev W/art﹕ Suspending all threads took: 48.763ms
03-25 12:19:01.549 2114-2126/com.comp.roadmap.dev I/art﹕ Background sticky concurrent mark sweep GC freed 126(7KB) AllocSpace objects, 0(0B) LOS objects, 0% free, 2MB/2MB, paused 86.924ms total 168.922ms
03-25 12:19:01.587 2114-2114/com.comp.roadmap.dev I/Google Maps Android API﹕ Google Play services package version: 7097470
03-25 12:19:02.333 2114-2126/com.comp.roadmap.dev I/art﹕ Background sticky concurrent mark sweep GC freed 10597(597KB) AllocSpace objects, 1(16KB) LOS objects, 4% free, 11MB/12MB, paused 3.255ms total 206.012ms
03-25 12:19:02.476 2114-2126/com.comp.roadmap.dev I/art﹕ Background partial concurrent mark sweep GC freed 14992(666KB) AllocSpace objects, 2(1015KB) LOS objects, 15% free, 10MB/12MB, paused 2.601ms total 128.036ms
03-25 12:19:02.605 2114-2138/com.comp.roadmap.dev E/Google Maps Android API﹕ Authorization failure. Please see https://developers.google.com/maps/documentation/android/start for how to correctly set up the map.
03-25 12:19:02.664 2114-2138/com.comp.roadmap.dev E/Google Maps Android API﹕ In the Google Developer Console (https://console.developers.google.com)
Ensure that the "Google Maps Android API v2" is enabled.
Ensure that the following Android Key exists:
API Key: AIzaSyDe8mb_u5CJ7D55Z2sohIoy9iT6SP_WM2A
Android Application (<cert_fingerprint>;<package_name>): A9:DC:CA:C8:90:F6:FA:44:1C:8F:5A:BC:EB:71:57:E8:6C:E5:3B:37;com.comp.roadmap.dev
03-25 12:19:02.667 2114-2138/com.comp.roadmap.dev I/Google Maps Android API﹕ Failed to contact Google servers. Another attempt will be made when connectivity is established.
03-25 12:19:02.792 2114-2130/com.comp.roadmap.dev W/EGL_emulation﹕ eglSurfaceAttrib not implemented
03-25 12:19:02.793 2114-2130/com.comp.roadmap.dev W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa4e7cf00, error=EGL_SUCCESS
03-25 12:19:04.727 2114-2149/com.comp.roadmap.dev D/﹕ HostConnection::get() New Host Connection established 0x9f4e91f0, tid 2149
03-25 12:19:04.758 2114-2114/com.comp.roadmap.dev I/Choreographer﹕ Skipped 122 frames! The application may be doing too much work on its main thread.
03-25 12:19:05.279 2114-2114/com.comp.roadmap.dev E/WindowManager﹕ android.view.WindowLeaked: Activity com.comp.roadmap.app.login has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{f60576c V.E..... R....... 0,0-684,388} that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:363)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:261)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.Dialog.show(Dialog.java:298)
at android.app.AlertDialog$Builder.show(AlertDialog.java:987)
at com.comp.roadmap.app.login.Alert(login.java:271)
at com.comp.roadmap.app.login.access$300(login.java:36)
at com.comp.roadmap.app.login$CheckLoginWSTask.onPostExecute(login.java:378)
at com.comp.roadmap.app.login$CheckLoginWSTask.onPostExecute(login.java:295)
at android.os.AsyncTask.finish(AsyncTask.java:632)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
03-25 12:19:17.719 2114-2150/com.comp.roadmap.dev E/Google Maps Android API﹕ Failed to load map. Error contacting Google servers. This is probably an authentication issue (but could be due to network errors).
//Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.comp.roadmap.app" >
<permission android:name="com.comp.roadmap.app.permission.MAPS_RECEIVE"
android:protectionLevel="signature">
</permission>
<uses-permission android:name="com.comp.roadmap.app.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<!--
The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
Google Maps Android API v2, but are recommended.
-->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-feature android:glEsVersion="0x00020000" android:required="true"></uses-feature>
<application
android:name=".PubVar"
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
</activity>
<activity
android:name=".add_msg"
android:label="@string/title_activity_add_msg" >
</activity>
<activity
android:name=".ItemDetail"
android:label="@string/title_activity_item_detail" >
</activity>
<activity
android:name=".ListFilter"
android:label="@string/title_activity_list_filter" >
</activity>
<activity
android:name=".login"
android:label="@string/title_activity_login" >
<intent-filter android:label="@string/app_name" >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".test1"
android:label="@string/title_activity_test1" >
</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="AIzaSyDe8mb_u5CJ7D55Z2sohIoy9iT6SP_WM2A" />
<activity
android:name=".MapsActivity"
android:label="@string/title_activity_maps" >
</activity>
</application>
</manifest>
// build.gradle
apply plugin: 'android'
android {
compileSdkVersion 22
buildToolsVersion '21.1.2'
defaultConfig {
minSdkVersion 11
targetSdkVersion 19
versionCode 7
versionName "0.1.65"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
productFlavors {
dev {
applicationId "com.roadmap.schlogger.dev"
}
prod {
applicationId "com.roadmapb.schlogger.app"
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile files('libs/ftp4j-1.7.2.jar')
compile files('libs/ksoap2-android-assembly-2.5.8-jar-with-dependencies.jar')
compile 'com.android.support:appcompat-v7:22.0.0'
compile 'com.google.android.gms:play-services:7.0.0'
}
//MapsActivity.java
package com.comp.roadmap.app;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class MapsActivity extends FragmentActivity {
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
setUpMapIfNeeded();
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
/**
* Sets up the map if it is possible to do so (i.e., the Google Play services APK is correctly
* installed) and the map has not already been instantiated.. This will ensure that we only ever
* call {@link #setUpMap()} once when {@link #mMap} is not null.
* <p/>
* If it isn't installed {@link SupportMapFragment} (and
* {@link com.google.android.gms.maps.MapView MapView}) will show a prompt for the user to
* install/update the Google Play services APK on their device.
* <p/>
* A user can return to this FragmentActivity after following the prompt and correctly
* installing/updating/enabling the Google Play services. Since the FragmentActivity may not
* have been completely destroyed during this process (it is likely that it would only be
* stopped or paused), {@link #onCreate(Bundle)} may not be called again so we should call this
* method in {@link #onResume()} to guarantee that it will be called.
*/
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
/**
* This is where we can add markers or lines, add listeners or move the camera. In this case, we
* just add a marker near Africa.
* <p/>
* This should only be called once and when we are sure that {@link #mMap} is not null.
*/
private void setUpMap() {
mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
}
}
//activity_maps.xml
<fragment 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:id="@+id/map"
tools:context="com.comp.roadmap.app.MapsActivity"
android:name="com.google.android.gms.maps.SupportMapFragment" />
答案 0 :(得分：0)
根据您的例外：
引起：java.lang.NullPointerException：
尝试调用虚方法'int java.lang。 String.length（）'对空对象引用 在java.io.StringReader。（StringReader.java:47）
at com.comp.roadmap.app.login $ CheckLoginWSTask.doInBackground（login.java:330）
at com.comp.roadmap.app.login $ CheckLoginWSTask。 doInBackground（login.java:295)
在行doInBackground(login.java:295)中，您要求的是一个null String变量的长度。
另外，您使用的是哪种API？
确保已启用“Google Maps Android API v2”。
和
确保存在以下Android密钥：API密钥：AIzaSyDe8mb_u5CJ7D55Z2sohIoy9iT6SP_WM2A
您下载了API并注册为能够使用maps api？
答案 1 :(得分：0)
如果您使用的是模拟器，可能您没有安装Google Play服务，即使您安装了Google Play服务，也请检查您是否拥有最新版本。