Shudy Shudy - 2 months ago 24
Android Question

Trying to set MultiDexApplication , ClassCastException

Scene:

I'm trying to set Firebase Messaging to the application, but when I add

classpath 'com.google.gms:google-services:3.0.0'
,
apply plugin: 'com.google.gms.google-services'
in the correct gradle files, and the
google-services.json
file, I try to launch the application but It crashes:

java.lang.RuntimeException: Unable to get provider com.google.firebase.provider.FirebaseInitProvider: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.res.Resources.getResourcePackageName(int)' on a null object reference


Reading a lot in SO, I read in some litte comment that maybe occur due the 65K method limit. So I tried to "Implement" the multidex in the app.

I followed the few steps that are in android guide -> https://developer.android.com/studio/build/multidex.html

The problem, is now I get this error:

09-14 11:42:36.371 31466-31466/es.in2.otr.app.im E/AndroidRuntime: FATAL EXCEPTION: main
Process: es.in2.otr.app.im, PID: 31466
java.lang.RuntimeException: Unable to start activity ComponentInfo{es.in2.otr.app.im/es.in2.otr.app.im.app.WelcomeActivity}: java.lang.ClassCastException: android.app.Application cannot be cast to es.in2.otr.app.im.app.ImApp
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3254)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3350)
at android.app.ActivityThread.access$1100(ActivityThread.java:222)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1795)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7229)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.ClassCastException: android.app.Application cannot be cast to es.in2.otr.app.im.app.ImApp
at es.in2.otr.app.im.app.ThemeableActivity.onCreate(ThemeableActivity.java:40)
at es.in2.otr.app.im.app.WelcomeActivity.onCreate(WelcomeActivity.java:98)
at android.app.Activity.performCreate(Activity.java:6876)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3207)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3350) 
at android.app.ActivityThread.access$1100(ActivityThread.java:222) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1795) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:158) 
at android.app.ActivityThread.main(ActivityThread.java:7229) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 


In the gradle file I set
multiDexApplication true
and compiled de multidex library.

IN the Manifest I have:

<application
android:name="android.support.multidex.MultiDexApplication"
android:allowBackup="false"
android:icon="@mipmap/ic_launcher_in2"
android:label="@string/im_label"
android:theme="@style/AppTheme"
tools:node="merge"
tools:replace="icon, label, android:allowBackup">
.....
</application>


I changed my
android:name=".app.ImApp"
for
android:name="android.support.multidex.MultiDexApplication"


Then I went to ImApp class and added the

@Override
protected void attachBaseContext(Context base) {
super.attachBaseContext(base);
MultiDex.install(this);
}


And tried to launch the App, but crashed with the error I post it before. After this I went to
WelcomeActivity
and
ThemeableACtivity
, and I have done the same. I added the
attachBaseContext
.

But I have the same problem.

How can I fix it?
Thanks.

Answer
android:name="your.package.YourApplicationClass"

Try this. Here extend yoru YourApplicationClass to MultiDexApplication

YourApplicationClass extends MultiDexApplication
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