blocks|key|4414694|text|你在使用Firebase崩溃报告吗？如果命中的是后台进程，而不是主进程，那么您可能会遇到这个错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4414695|崩溃报告创建第二个进程(background_crash)来发送崩溃。不幸的是，安卓应用程序中的所有进程都共享一个公共的Application子类，因此您的onCreate方法也在后台进程中运行。尝试初始化数据库，但失败了。|offset|length|style|CODE|4414696|修复方法是确保只有在正确配置Firebase+(将在主进程中)时才会运行数据库调用。您可以像这样检查：|4414697|@Override
public+void+onCreate()+{
++super.onCreate();
++if+(!FirebaseApp.getApps(this).isEmpty())+{
++++FirebaseDatabase.getInstance().setPersistenceEnabled(true);
++}
}|code-block|syntax|javascript|4414698|entityMap^0|0|C|G|1O|B|26|8|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]|$D|U|E|V|F|G]|$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|Z|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|P|$]]

Are you using Firebase Crash Reporting? You might be hitting this error because of that if its hitting a background process and not the main. 

Crash Reporting creates a second process (<code>background_crash</code>) to send crashes. Unfortunately, all processes in an Android app share a common <code>Application</code> subclass, so your <code>onCreate</code> method is run in the background process as well. That tries to initialise database, which fails. 

The fix is to make sure the Database call is only run when Firebase is properly configured (which will be in the main process). You can check like this:

<pre><code>@Override
public void onCreate() {
 super.onCreate();
 if (!FirebaseApp.getApps(this).isEmpty()) {
 FirebaseDatabase.getInstance().setPersistenceEnabled(true);
 }
}
</code></pre>

blocks|key|4414785|text|我通过不在应用程序中放置Firebase的任何东西来解决这个错误。我把它放到MainActivity里了。示例:+MainActivity.java|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4414786|@Override
++protected+void+onCreate(Bundle+savedInstanceState)+{
++++super.onCreate(savedInstanceState);
++++FirebaseDatabase.getInstance().setPersistenceEnabled(true);
++++...
}|code-block|syntax|javascript|4414787|-UPDATE|4414788|其他解决方案是创建包含一个FirebaseDatabase实例DatabaseHelper类。|4414789|public+class+DatabaseHelper+{
++private+static+boolean+persistenceEnable+=+false;
++private+static+FirebaseDatabase+mDatabase;


++public+static+boolean+isPersistenceEnable(){
++++return+persistenceEnable;
++}
++public+static+FirebaseDatabase+getInstance()+{
++++if+(mDatabase+==+null)+{
++++++mDatabase+=+FirebaseDatabase.getInstance();
++++++if(persistenceEnable==true)+{
++++++++mDatabase.setPersistenceEnabled(true);
++++++}
++++}

++++return+mDatabase;
++}
}|4414790|使用方式:+FirebaseDatabase数据库=+DatabaseHelper.getInstance()；|4414791|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I solved this error by don't put anything of Firebase in Application. I put it in to MainActivity. Example:
MainActivity.java

<pre><code>@Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 FirebaseDatabase.getInstance().setPersistenceEnabled(true);
 ...
}
</code></pre>

-UPDATE

Other solution is create a DatabaseHelper class contain one FirebaseDatabase instance.

<pre class="lang-html prettyprint-override"><code>public class DatabaseHelper {
 private static boolean persistenceEnable = false;
 private static FirebaseDatabase mDatabase;


 public static boolean isPersistenceEnable(){
 return persistenceEnable;
 }
 public static FirebaseDatabase getInstance() {
 if (mDatabase == null) {
 mDatabase = FirebaseDatabase.getInstance();
 if(persistenceEnable==true) {
 mDatabase.setPersistenceEnabled(true);
 }
 }

 return mDatabase;
 }
}
</code></pre>

and using by: FirebaseDatabase database = DatabaseHelper.getInstance();

blocks|key|4414834|text|扩展@Ian+Barber的解决方案，您可以尝试此通用检查以跳过为所有非主进程处理自定义Application.onCreate。如果额外的进程不属于您，那么您就不希望运行任何自定义进程。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4414835|@Override
public+void+onCreate()+{
++++super.onCreate();
++++if+(FirebaseApp.getApps(this).isEmpty())+{
++++++++//+No+firebase+apps;+we+are+in+a+non-main+process
++++++++//+skip+custom+Application.onCreate
++++++++return;
++++}
++++//+Firebase+init+only+in+the+main+process
++++FirebaseDatabase.getInstance().setPersistenceEnabled(true);
++++//+other+code
}|code-block|syntax|javascript|4414836|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Extending @Ian Barber's solution, you can try this generic check to skip processing your custom Application.onCreate for all non-main processes. If the additional processes don't belong to you, then you don't want any of your custom to run.

<pre><code>@Override
public void onCreate() {
 super.onCreate();
 if (FirebaseApp.getApps(this).isEmpty()) {
 // No firebase apps; we are in a non-main process
 // skip custom Application.onCreate
 return;
 }
 // Firebase init only in the main process
 FirebaseDatabase.getInstance().setPersistenceEnabled(true);
 // other code
}
</code></pre>

I have been getting this issue.. followed the upgrade guide for new firebase sdk...saved the google services json file in app directory.. still the same error as you but for the database...

<pre><code>Caused by: java.lang.IllegalStateException: FirebaseApp with name [DEFAULT] doesn't exist.
</code></pre>

java.lang.IllegalStateException: FirebaseApp with name [DEFAULT]

数据库

我一直收到这个问题..遵循应用程序目录中的google services sdk...saved文件的升级指南。仍然与您相同的错误，但对于数据库...Caused by: java.lang.IllegalStateException: FirebaseApp with name [DEFAULT] doesn't e...

问java.lang.IllegalStateException:名称为[默认]的FirebaseApp
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