我正在尝试通过引用https://firebase.google.com/docs/android/setup将FCM集成到我在Android Studio中开发的Android应用中。在App启动时，它因NPE而崩溃。
编辑：
1。设备用于测试：Samsung Note 3
2。操作系统：5.0
3。 Android SDK中更新了支持存储库和Google服务。在应用的build.gradle中评论应用插件：'com.google.gms.google-services'这一行不会导致此问题。该问题与此有关。
这是logcat：
creating new AssetManager and set to /data/app/com.att.digitallife.pes-1/base.apk
D/FirebaseApp: com.google.firebase.auth.FirebaseAuth is not linked. Skipping initialization.
W/InstanceID/Rpc: Found 10017
D/FirebaseApp: com.google.firebase.crash.FirebaseCrash is not linked. Skipping initialization.
I/FA: App measurement is starting up, version: 9683
I/FA: To enable debug logging run: adb shell setprop log.tag.FA VERBOSE
I/FA: To enable faster debug mode event logging run:
adb shell setprop firebase.analytics.debug-mode
15651-15651/com.nytshift.ergo.pas D/PAS I/FirebaseInitProvider: FirebaseApp initialization successful
15651-15651/com.nytshift.ergo.pas D/PAS : Service created
15651-15651/com.nytshift.ergo.pas D/PAS ### Service ::: onStart()
15651-15651/com.nytshift.ergo.pas D/PAS : ###Service::Something unknown happened...null
15651-15651/com.nytshift.ergo.pas D/PAS D/AndroidRuntime: Shutting down VM
15651-15651/com.nytshift.ergo.pas D/PAS E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.nytshift.ergo.pas, PID: 15651
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean com.google.android.gms.common.ConnectionResult.isSuccess()' on a null object reference
at com.google.android.gms.common.internal.zze$zzi.zzh(Unknown Source)
at com.google.android.gms.common.internal.zze$zzk.zzaua(Unknown Source)
at com.google.android.gms.common.internal.zze$zza.zzc(Unknown Source)
at com.google.android.gms.common.internal.zze$zza.zzv(Unknown Source)
at com.google.android.gms.common.internal.zze$zze.zzauc(Unknown Source)
at com.google.android.gms.common.internal.zze$zzd.handleMessage(Unknown Source)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5942)
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:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
这是Project的build.gradle：
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.0.0'
classpath 'com.google.gms:google-services:3.0.0'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
以下是我的App的build.gradle的样子：
apply plugin: 'com.android.application'
android {
compileSdkVersion 20
buildToolsVersion "23.0.3"
sourceSets {
main {
jniLibs.srcDirs = ['libs']
}
// Move the tests to tests/java, tests/res, etc...
instrumentTest.setRoot('tests')
// Move the build types to build-types/<type>
// For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...
// This moves them out of them default location under src/<type>/... which would
// conflict with src/ being used by the main source set.
// Adding new build types or product flavors should be accompanied
// by a similar customization.
debug.setRoot('build-types/debug')
release.setRoot('build-types/release')
}
lintOptions {
abortOnError false
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_7
targetCompatibility JavaVersion.VERSION_1_7
}
productFlavors {
x86 {
ndk {
abiFilter "x86"
}
}
arm {
ndk {
abiFilters "armeabi-v7a", "armeabi"
}
minSdkVersion 17
}
}
packagingOptions {
exclude 'META-INF/DEPENDENCIES'
exclude 'META-INF/NOTICE'
exclude 'META-INF/LICENSE'
exclude 'META-INF/license.txt'
exclude 'META-INF/notice.txt'
}
defaultConfig {
applicationId "com.nytshift.ergo.pas"
minSdkVersion 17
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.google.firebase:firebase-core:9.6.1'
compile 'com.google.firebase:firebase-messaging:9.6.1'
}
apply plugin: 'com.google.gms.google-services'
FireBaseInstanceIDService.java ：
public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {
private static final String TAG = "MyFirebaseIIDService";
/**
* Called if InstanceID token is updated. This may occur if the security of
* the previous token had been compromised. Note that this is called when the InstanceID token
* is initially generated so this is where you would retrieve the token.
*/
// [START refresh_token]
@Override
public void onTokenRefresh() {
// Get updated InstanceID token.
PESLog.debug("Inside onTokenRefresh****");
String refreshedToken = FirebaseInstanceId.getInstance().getToken();
Log.d(TAG, "Refreshed token: " + refreshedToken);
// If you want to send messages to this application instance or
// manage this apps subscriptions on the server side, send the
// Instance ID token to your app server.
sendRegistrationToServer(refreshedToken);
}
// [END refresh_token]
/**
* Persist token to third-party servers.
*
* Modify this method to associate the user's FCM InstanceID token with any server-side account
* maintained by your application.
*
* @param token The new token.
*/
private void sendRegistrationToServer(String token) {
// TODO: Implement this method to send token to your app server.
}
}
MyFirebaseMessagingService.java ：
public class MyFirebaseMessagingService extends FirebaseMessagingService {
private static final String TAG = "MyFirebaseMsgService";
public void onMessageReceived(RemoteMessage remoteMessage) {
Log.d(TAG, "From: " + remoteMessage.getFrom());
// Check if message contains a data payload.
if (remoteMessage.getData().size() > 0) {
Log.d(TAG, "Message data payload: " + remoteMessage.getData());
}
// Check if message contains a notification payload.
if (remoteMessage.getNotification() != null) {
Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
//Calling method to generate notification
//sendNotification(remoteMessage.getNotification().getBody());
}
Toast.makeText(getApplicationContext(), "Push notification: " + remoteMessage.getNotification().getBody(), Toast.LENGTH_LONG).show();
// Also if you intend on generating your own notifications as a result of a received FCM
// message, here is where that should be initiated. See sendNotification method below.
}
// [END receive_message]
/**
* Create and show a simple notification containing the received FCM message.
* This method is only generating push notification.
* @param messageBody FCM message body received.
*/
private void sendNotification(String messageBody) {
Intent intent = new Intent(this, PESEmergencyHomeScreen.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
PendingIntent.FLAG_ONE_SHOT);
Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.androidwidget_logo)
.setContentTitle("FCM Message")
.setContentText(messageBody)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setContentIntent(pendingIntent);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
}
}
清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.nytshift.ergo.pas"
android:versionCode="7"
android:versionName="0.9.3">
<uses-sdk android:minSdkVersion="17" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.WRITE_CONTACTS" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.GET_TASKS" />
<uses-feature
android:name="android.hardware.telephony"
android:required="false" />
<uses-feature
android:name="android.hardware.location"
android:required="false" />
<uses-feature
android:name="android.hardware.location.network"
android:required="false" />
<uses-feature
android:name="android.hardware.location.gps"
android:required="false" />
<uses-feature
android:name="android.hardware.wifi"
android:required="false" />
<uses-feature
android:name="android.hardware.touchscreen"
android:required="false" />
<uses-feature
android:name="android.hardware.camera"
android:required="false" />
<uses-feature
android:name="android.hardware.camera.front"
android:required="false" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true"></uses-feature>
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<!-- *** End ZDA library *** -->
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<!-- Keeps the processor from sleeping when a message is received. -->
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:hardwareAccelerated="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<receiver
android:name="urls for GCM receiver"
android:permission="com.google.android.c2dm.permission.SEND"
android:process=":Service">
<intent-filter>
<action android:name="com.google.android.c2dm.intent.RECEIVE" />
<action android:name="com.google.android.c2dm.intent.REGISTRATION" />
<category android:name="com.nytshift.ergo.pas" />
</intent-filter>
</receiver>
<activity
android:name=".login.SplashScreen"
android:launchMode="singleTask">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW"></action>
<category android:name="android.intent.category.DEFAULT"></category>
<category android:name="android.intent.category.BROWSABLE"></category>
</intent-filter>
</activity>
<service
android:name=".alert.Service"
android:label="Service"></service>
<receiver android:name=".zos.NotificationsHandler">
<intent-filter>
<action android:name="urls" />
</intent-filter>
</receiver>
<!-- FireBase starts -->
<service android:name=".firebaseservice.MyFirebaseMessagingService"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="com.google.firebase.MESSAGING_EVENT" />
</intent-filter>
</service>
<service android:name=".firebaseservice.MyFirebaseInstanceIDService"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
</intent-filter>
</service>
</application>
</manifest>
可能是什么问题？请帮忙。
答案 0 :(得分：1)
我真的不知道你如何设置你的FCM所以我建议你创建一个新项目测试它，这样你就知道如何将它实现到你的主应用程序。 FCM设置比GCM简单得多。
您只需按照文档即可观看多个教程。这样就可以忘记您对GCM的了解。
在您的清单中删除任何有关GCM的相关代码并将其替换为此代码，那么您将会很高兴。
<service
android:name=".MyFirebaseMessagingService"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="com.google.firebase.MESSAGING_EVENT" />
</intent-filter>
</service>
<!-- [END firebase_service] -->
<!-- [START firebase_iid_service] -->
<service android:name=".MyFirebaseInstanceIDService">
<intent-filter>
<action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
</intent-filter>
</service>
如果您想知道为什么在清单中不需要接收器来接收FCM，那只是因为GCM不赞成使用LOL。
不要忘记插入google-services.json文件
答案 1 :(得分：0)
经过几天的调查，我终于找到了导致Null Pointer Exception的原因。有一个google-play-services.jar驻留在项目的libs文件夹中。（为其他模块而不是FireBase添加）与
我们为apply plugin: 'com.google.gms.google-services'添加的FireBase。
我不得不从我项目的libs文件夹中删除jar，并添加相同的依赖项，如下所示：
compile 'com.google.android.gms:play-services:10.0.1'