Apps EWS-JAVA-API: java.lang.VerifyError: microsoft/exchange/webservices/data/ExchangeServiceBase

[Noman Ud Din]

I know this question has been asked several time but not a single solution worked for me. I spent almost three days on all the available solutions

I am using android studio.

I have used code and libraries provided on this link: Github link for ews project

But I am facing following error:

java.lang.VerifyError: microsoft/exchange/webservices/data/ExchangeServiceBase
                                                                 at culha.roomdispaly.MainActivity.onCreate(MainActivity.java:125)
                                                                 at android.app.Activity.performCreate(Activity.java:5411)
                                                                 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
                                                                 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2270)
                                                                 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2396)
                                                                 at android.app.ActivityThread.access$800(ActivityThread.java:139)
                                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1293)
                                                                 at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                 at android.os.Looper.loop(Looper.java:149)
                                                                 at android.app.ActivityThread.main(ActivityThread.java:5257)
                                                                 at java.lang.reflect.Method.invokeNative(Native Method)
                                                                 at java.lang.reflect.Method.invoke(Method.java:515)
                                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
                                                                 at dalvik.system.NativeStart.main(Native Method)

My Build.gradle file:

apply plugin: 'com.android.application'

android {
compileSdkVersion 23
buildToolsVersion "23.0.2"
useLibrary 'org.apache.http.legacy'

packagingOptions  {
    exclude 'META-INF/DEPENDENCIES.txt'
    exclude 'META-INF/LICENSE.txt'
    exclude 'META-INF/NOTICE.txt'
    exclude 'META-INF/NOTICE'
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/DEPENDENCIES'
    exclude 'META-INF/notice.txt'
    exclude 'META-INF/license.txt'
    exclude 'META-INF/dependencies.txt'
    exclude 'META-INF/LGPL2.1'}

defaultConfig {
    applicationId "culha.roomdispaly"
    minSdkVersion 19
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
}
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            zipAlignEnabled true
        }
    }
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.android.support:design:23.1.1'
compile files('libs/commons-lang-2.6.jar')
compile files('libs/commons-logging-1.1.1.jar')
compile files('libs/ical4j-1.0.3.jar')
compile files('libs/backport-util-concurrent.jar')
compile 'com.google.android.gms:play-services-appindexing:8.1.0'
compile files('libs/ews-java-api-2.0.jar')
compile files('libs/jcifs-1.3.15.jar')}
}

My code where I am calling ews:

 try {
            ExchangeService service = new ExchangeService();
            ExchangeCredentials credentials = new WebCredentials("xxxxx", "xxxx");
            service.setCredentials(credentials);
            service.setUrl(new URI("https://xxx.xxx.comxxxx"));
            FolderView view = new FolderView(10);
            PropertySet set = new PropertySet(BasePropertySet.IdOnly);
            set.add(FolderSchema.DisplayName);
            view.setPropertySet(set);
            SearchFilter searchFilter = new SearchFilter.IsGreaterThan(FolderSchema.TotalCount, 0);
            view.setTraversal(FolderTraversal.Deep);
            FindFoldersResults findFolderResults = service.findFolders(WellKnownFolderName.Root, searchFilter, view);
            for (Folder folder : findFolderResults)
            { if (folder instanceof CalendarFolder)
            { System.out.println("Calendar folder: " + folder.getDisplayName());
                //calendarNames.add(folder.getDisplayName() + "," + folder.getId());
            }
            }
            //ewstest.connectViaExchangeManually("Meetingroom1@culha-consulting.de","Meeting1234");
            //ExchangeWebservice.connectViaExchangeManually("Meetingroom1@culha-consulting.de","Meeting1234");
        } catch (Exception e) {
            e.printStackTrace();
        }