java - Android - app crashes when using a signed APK -

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i trying signed apk android app. app works when install through android studio when generate signed apk , install app using apk following exception. idea on going on?

    java.lang.runtimeexception: unable start activity componentinfo{com.app.test/com.app.test.activities.menuactivity}: java.lang.nullpointerexception: attempt invoke virtual method 'boolean java.lang.string.equalsignorecase(java.lang.string)' on null object reference             @ android.app.activitythread.performlaunchactivity(activitythread.java:2358)             @ android.app.activitythread.handlelaunchactivity(activitythread.java:2420)             @ android.app.activitythread.access$900(activitythread.java:154)             @ android.app.activitythread$h.handlemessage(activitythread.java:1321)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.app.activitythread.main(activitythread.java:5292)             @ java.lang.reflect.method.invoke(native method)             @ java.lang.reflect.method.invoke(method.java:372)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:904)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:699)      caused by: java.lang.nullpointerexception: attempt invoke virtual method 'boolean java.lang.string.equalsignorecase(java.lang.string)' on null object reference             @ com.app.test.h.a.e(unknown source)             @ com.app.test.activities.menuactivity.a(unknown source)             @ com.app.test.activities.menuactivity.oncreate(unknown source)             @ android.app.activity.performcreate(activity.java:5990)             @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1106)             @ android.app.activitythread.performlaunchactivity(activitythread.java:2311)             @ android.app.activitythread.handlelaunchactivity(activitythread.java:2420)             at android.app.activitythread.access$900(activitythread.java:154)             at android.app.activitythread$h.handlemessage(activitythread.java:1321)             at android.os.handler.dispatchmessage(handler.java:102)             at android.os.looper.loop(looper.java:135)             at android.app.activitythread.main(activitythread.java:5292)             at java.lang.reflect.method.invoke(native method)             at java.lang.reflect.method.invoke(method.java:372)             at com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:904)             at com.android.internal.os.zygoteinit.main(zygoteinit.java:699)

this gradle build file looks like

    buildscript {     }     apply plugin: 'com.android.application'      android {         compilesdkversion 21         buildtoolsversion "21.1.2"         // installed in sdk manager          defaultconfig {             applicationid "com.app.test"             minsdkversion 17             targetsdkversion 21             versioncode 1             versionname "1.0"             multidexenabled true         }         buildtypes {             release {                 minifyenabled true                 proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'             }         }     }       repositories {         mavencentral()         flatdir {             dirs 'libs'         }          maven { url 'http://maven.livotovlabs.pro/content/groups/public' }       }      dependencies {         compile filetree(dir: 'libs', include: ['*.jar'])         compile 'com.android.support:support-v4:21.0.3'         compile 'com.google.android.gms:play-services:6.5.87'         compile 'com.google.code.gson:gson:2.3.1'          compile 'com.squareup.okhttp:okhttp:2.5.0'         compile 'com.squareup.picasso:picasso:2.5.2'      }

you using proguard , have enables setting minifyenabled true.

buildtypes {             release {                 minifyenabled true                 proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'             }         }

if dont want use make minifyenabled false. otherwise read how use proguard http://developer.android.com/tools/help/proguard.html here discards class files , other resource not added in proguard-rules.pro.


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