android - Multidex :no class found exception -

my app exceeding 64k methods iam supposed implement multidex , had problem "local path doesnt exist" fixed problem ,now gradle generated classes1.dex , classes2.dex , not working in lower lollipop..it working fine in lollipop since has native support .error says "<1st activity> not present in dex path"

after seeing tutorials said have change in 1.gradle 2.application class 3.manifest

i dont have knowledge application class ..kindly guide me thanks

note:this imported project eclipse .

kindly check build.gradle file

apply plugin: 'com.android.application' android { defaultconfig {     compilesdkversion 23     buildtoolsversion '23.0.1'     minsdkversion 15 //lower 14 doesn't support multidex     targetsdkversion 23   } dexoptions {     jumbomode = true      predexlibraries = false     javamaxheapsize "2048m" } afterevaluate {     tasks.matching {         it.name.startswith('dex')     }.each { dx ->         if (dx.additionalparameters == null) {             dx.additionalparameters = ['--multi-dex']         } else {             dx.additionalparameters += '--multi-dex'         }     } } sourcesets {     main {         manifest.srcfile 'androidmanifest.xml'         java.srcdirs = ['src']         resources.srcdirs = ['src']         aidl.srcdirs = ['src']         renderscript.srcdirs = ['src']         res.srcdirs = ['res']         assets.srcdirs = ['assets']     }      // move tests tests/java, tests/res, etc...     instrumenttest.setroot('tests')      // move build types build-types/<type>     // instance, build-types/debug/java, build-types/debug/androidmanifest.xml, ...     // moves them out of them default location under src/<type>/...     // conflict src/ being used main source set.     // adding new build types or product flavors should accompanied     // similar customization.     debug.setroot('build-types/debug')     release.setroot('build-types/release') } productflavors { } buildtypes {     release {         minifyenabled true         proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'     } } } dependencies { compile filetree(include: ['*.jar'], dir: 'libs') compile 'com.android.support:appcompat-v7:23.0.1' compile 'com.android.support:multidex:1.0.1' } 

you followed tutorial shows how add multi-dex support manually before android gradle plugin had support it. since v0.14.0, need add:

android {   defaultconfig {      ...      multidexenabled true } 

and can choose 1 of 3 options call multidex code. multidexapplication documentation:

minimal multidex capable application. use legacy multidex library there 3 possibilities:
- declare class application in androidmanifest.xml.
- have application extends class.
- have application override attachbasecontext starting with

    protected void attachbasecontext(context base) {         super.attachbasecontext(base);         multidex.install(this);     } 

don't forget remove afterevaluate block build script.

make sure you've read official documentation.