Android - App crashing with "java.lang.ClassCastException"

Question

I am using a tutorial provided by Google to implement Analytics in my app but something I possibly did wrong that causes the app to crash with java.lang.ClassCastException

This is what Google provided:

// Obtain the shared Tracker instance.
AnalyticsApplication application = (AnalyticsApplication) getApplication();
mTracker = application.getDefaultTracker();

This is the changes I made because I am using a Fragment

// This is where I get the error
AnalyticsApplication application = (AnalyticsApplication) getContext().getApplicationContext();
mTracker = application.getDefaultTracker();

UPDATE : The error happens at this line:

AnalyticsApplication application = (AnalyticsApplication) getContext().getApplicationContext();

This is my LogCat

FATAL EXCEPTION: main
Process: com.incorp.labs.appname, PID: 14095
java.lang.ClassCastException: android.app.Application cannot be cast to com.incorp.labs.appname.Helper.AnalyticsTracker
  at com.incorp.labs.appname.OneFragment.onCreateView(OneFragment.java:126)

UPDATE 2 : This is the Manifest file

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.incorp.labs.appname">

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="com.android.vending.BILLING" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/newlogops"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/MyMaterialTheme">
    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />

    <activity
        android:name=".Splash"
        android:screenOrientation="portrait" />
    <activity
        android:name=".MainActivity"
        android:screenOrientation="portrait"
        android:windowSoftInputMode="adjustPan" />
    <activity
        android:name=".OneFragment"
        android:screenOrientation="portrait"
        android:windowSoftInputMode="adjustPan" />
    <activity
        android:name=".TwoFragment"
        android:screenOrientation="portrait" />
    <activity
        android:name=".Feedback"
        android:screenOrientation="portrait"
        android:windowSoftInputMode="adjustPan" />
    <activity
        android:name=".FourFragment"
        android:screenOrientation="portrait" />
    <activity
        android:name=".SplashTimer"
        android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <activity
        android:name="com.google.android.gms.ads.AdActivity"
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
        android:theme="@android:style/Theme.Translucent" />

    <service android:name=".FirebaseMessagingService">
        <intent-filter>                     
            <action android:name="com.google.firebase.MESSAGING_EVENT" />
             
        </intent-filter>
    </service>

    <activity android:name=".AboutActivity"></activity>
</application>

1)https://stackoverflow.com/questions/31312255/error-on-my-fragment-android-app-application-cannot-be-cast-to 2)https://stackoverflow.com/questions/24950341/android-google-analytics-integration-error — Ricky Patel, Sep 15 '17 at 10:07
According to documentation this is only thrown when a code has attempted to cast an Object to a subclass of which is not an instance. AnalyticsApplication and AnalyticsTracker — Lokesh Pandey, Sep 15 '17 at 10:08
@Lokesh I changed the class name, but that shouldn't be a problem right ? — Thorvald, Sep 15 '17 at 10:10
I think that you didn't declare your custom application in your manifest. SHow the manifest. — Vladyslav Matviienko, Sep 15 '17 at 11:22
@VladMatvienko yes correct I don't think I did, how to do so please ? — Thorvald, Sep 15 '17 at 11:26

score 4 · Answer 1 · answered Sep 15 '17 at 10:10

4

Just change this :-

AnalyticsTracker application = (AnalyticsTracker) getContext().getApplicationContext();

to this :-

AnalyticsApplication application = (AnalyticsApplication) getContext().getApplicationContext();

It's one of those obvious errors that happen with the best of us!

answered Sep 15 '17 at 10:10

Rohan Stark

2,346
9
16

I changed the class name on purpose, does it make any difference ? – Thorvald Sep 15 '17 at 10:11
1

It's not about the class name. It's the fact that you're trying to cast an `AnalyticsApplication` object to an `AnalyticsTracker` object. Thus, the `ClassCastException` occurs. It's been done correctly in the Google code that you posted. – Rohan Stark Sep 15 '17 at 10:14
no I made all the changes and I still have the same error, check the updated answer where I specify the line – Thorvald Sep 15 '17 at 10:23
I don't think you should be getting an error now. Could you clean and rebuild and run again? – Rohan Stark Sep 15 '17 at 10:56
unfortunately it didn't – Thorvald Sep 15 '17 at 11:10
Did you clean and rebuild and reinstall the application? Your LogCat specifically points to the error that I have mentioned. – Rohan Stark Sep 15 '17 at 11:12
yes I did everything you told me and followed all your steps – Thorvald Sep 15 '17 at 11:15
Well, that's odd. Could you post your entire updated Fragment code and the latest LogCat error? – Rohan Stark Sep 15 '17 at 11:18

score 2 · Accepted Answer · answered Sep 15 '17 at 11:38

2

In addition to implementing the extends Application class, you need to tell Android system which class to use as an Application class. To do so, set the name of your application class in manifest:

<application
        android:name="your.package.AnalyticsApplication"

answered Sep 15 '17 at 11:38

Vladyslav Matviienko

10,610
4
33
52

this seems to be the solution but I get "Unresolved class" when I added `android:name="..."` my packaage looks like this: `com.incorp.labs.appname` – Thorvald Sep 15 '17 at 12:10
@ThorvaldÓlavsenV. show how exactly have you added. – Vladyslav Matviienko Sep 15 '17 at 12:10
like this: `android:name="com.incorp.labs.appname.AnalyticsApplication"` – Thorvald Sep 15 '17 at 12:12
@ThorvaldÓlavsenV., are you sure that `AnalyticsApplication` is in package `com.incorp.labs.appname`? – Vladyslav Matviienko Sep 15 '17 at 12:25
it is fixed now! the class was inside a subfolder that I overlooked – Thorvald Sep 15 '17 at 12:33

No More Hello World · Answer 3 · 2017-09-15T11:53:27.303

1

I think you're trying to use a Context object (getApplicationContext()) as an application object.

Try this: EDIT

AnalyticsApplication application = (AnalyticsApplication) getActivity().getApplication();

From your fragment you can call the activity that contains the fragment. When you get the activity, you can use the getApplication() function as in the example.

I hope it helps.

EDIT 2

As seen in this answer: https://stackoverflow.com/a/35905601/4336354 from CommonsWare user.

Your AndroidManifest.xml file does not contain your custom Application subclass, so Android is using the default one (android.app.Application).

Add an android:name="auc.games2.Analytics.AnalyticsApplication" attribute to your element.

edited Sep 15 '17 at 11:53

answered Sep 15 '17 at 11:03

No More Hello World

425
4
16

Sorry, i also wrote the line wrong. It must be an AnalyticsApplication class instead of an AnalyticsTracker. – No More Hello World Sep 15 '17 at 11:14
That's not the problem, I fixed it and still nothing – Thorvald Sep 15 '17 at 11:16
In which method did you write the line, in onCreate()? It will not work until the fragment is attached to the activity, so you should overwrite the onAttached() or onResume() methods. – No More Hello World Sep 15 '17 at 11:43
Also check this answer, it may help: https://stackoverflow.com/a/35905601/4336354 – No More Hello World Sep 15 '17 at 11:45

Android - App crashing with "java.lang.ClassCastException"

3 Answers3