我将使用 firebase-messaging
库并尝试在app启动时使用以下方法获取令牌 .
FirebaseInstanceId.getInstance().getInstanceId().addOnSuccessListener(new OnSuccessListener() {
@Override
public void onSuccess(InstanceIdResult instanceIdResult) {
String token = instanceIdResult.getToken();
// print token
}
});
应用程序在发布本身崩溃时崩溃
java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.tasks.Task com.google.firebase.iid.FirebaseInstanceId.getInstanceId()' on a null object reference
AndroidManifest
<service
android:name=".MyFirebaseMessageService">
<intent-filter>
<action android:name="com.google.firebase.MESSAGING_EVENT"/>
</intent-filter>
</service>
Build.gradle:
implementation 'com.google.android.gms:play-services-analytics:16.0.5'
implementation 'com.google.firebase:firebase-messaging:17.3.4'
此外,我试图在SharedPreferences中缓存令牌,但似乎永远不会调用onNewToken() .
@Override
public void onNewToken(String token) {
super.onNewToken(token);
SharedPreferences preference = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = preference.edit();
editor.putString("TOKEN",token);
editor.apply();
}
可能是什么问题呢?