Singed apk gives ClassNotFoundException in android

Question

I am generating singed apk using eclipse Export Signed Application Package. After generating signed apk i have installed that into my device at that time I got unfortunately stopped exception this occurs due to ClassNotFoundException. This Exception occurs only with signed apk. Normal installation working fine.

My Error Log

05-14 18:48:39.561: E/AndroidRuntime(15982): FATAL EXCEPTION: main
05-14 18:48:39.561: E/AndroidRuntime(15982): java.lang.RuntimeException: Unable to instantiate application com.yyy.android.xxx.MyApplication: java.lang.ClassNotFoundException: com.yyy.android.xxx.MyApplication
05-14 18:48:39.561: E/AndroidRuntime(15982):    at android.app.LoadedApk.makeApplication(LoadedApk.java:482)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3982)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at android.app.ActivityThread.access$1300(ActivityThread.java:127)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1212)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at android.os.Handler.dispatchMessage(Handler.java:99)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at android.os.Looper.loop(Looper.java:137)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at android.app.ActivityThread.main(ActivityThread.java:4503)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at java.lang.reflect.Method.invokeNative(Native Method)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at java.lang.reflect.Method.invoke(Method.java:511)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:809)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at dalvik.system.NativeStart.main(Native Method)
05-14 18:48:39.561: E/AndroidRuntime(15982): Caused by: java.lang.ClassNotFoundException: com.yyy.android.xxx.MyApplication
05-14 18:48:39.561: E/AndroidRuntime(15982):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at android.app.Instrumentation.newApplication(Instrumentation.java:942)
05-14 18:48:39.561: E/AndroidRuntime(15982):    at android.app.LoadedApk.makeApplication(LoadedApk.java:477)

My Manifest:

<application
        android:name=".MyApplication"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:largeHeap="true"
        android:logo="@drawable/title_logo"
        android:theme="@style/Theme.App" >

        <!-- Tablet Starts -->

        <activity
            android:name=".ui.StartActivity"
            android:configChanges="orientation|keyboardHidden|screenSize"
            android:label="@string/app_name"
            android:screenOrientation="landscape"
            android:theme="@style/Theme.App" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

I have selected check boxes Android Private Libraries and Android Dependencies under Order and Exports tag. And I used proguard.cfg it contains -keep public class * extends android.app.Application. I unselected check box Run full check when exporting under Lint Error Checking. Please help me to get signed apk without any issue. Thank You.

it seems to be proguard issue..but without the logs we can't really help. — Alécio Carvalho, May 14 '14 at 13:16
have you seen this answer? Might be related. http://stackoverflow.com/a/6282372/655987 — yildirimyigit, May 14 '14 at 13:20
@SathishKumar Have you tried specifying `-dontwarn` in your proguard file ? — GrIsHu, May 21 '14 at 10:30
Yeah i tried these, `-dontwarn android.support.** -dontwarn com.yyy.lib.** -dontwarn org.xmlpull.v1.**` — SathishKumar, May 21 '14 at 10:45

score 0 · Answer 1 · answered May 14 '14 at 13:31

0

Ensure you have this on your proguard file -keep public class * extends android.app.Application like this:

 -keep public class * extends android.app.Activity
 -keep public class * extends android.app.Application
 -keep public class * extends android.app.Service
 -keep public class * extends android.content.BroadcastReceiver
 -keep public class * extends android.content.ContentProvider
 -keep public class * extends android.app.backup.BackupAgentHelper
 -keep public class * extends android.preference.Preference
 -keep public class * extends android.support.v4.app.Fragment
 -keep public class * extends android.widget.BaseAdapter
 -keep class com.android.vending.billing.**

and make sure your proguard file is really being used.

answered May 14 '14 at 13:31

Alécio Carvalho

13,481
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yeah all are exists in proguard and proguard in use only – SathishKumar May 14 '14 at 13:53
nothing strange...in this case i think there's some problem on the execution of the export of APK...check out this other post and try the various techniques that suits you best: http://stackoverflow.com/questions/4600891/how-to-build-an-apk-file-in-eclipse – Alécio Carvalho May 15 '14 at 08:19
Yeah sure let i try these things. Thank you for your guidance – SathishKumar May 15 '14 at 08:44

score 0 · Answer 2 · answered Nov 10 '15 at 03:25

0

I had the same problem after disabling minifyEnabled true fixed the problem. if the problem only exist on signed apk. check buildtypes release on module.gradle

 buildTypes {
    release {
     // minifyEnabled true

    }
}

answered Nov 10 '15 at 03:25

APP Bird

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Singed apk gives ClassNotFoundException in android

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