Develop Reference

Warning: org.apache.poi.hssf.usermodel.DummyGraphics2d

When i try use from proguard these errors and warnings are comming and APK file not builds:
Warnings:
org.apache.poi.hssf.usermodel.DummyGraphics2d: can't find superclass
or interface java.awt.Graphics2D
org.apache.poi.hssf.usermodel.EscherGraphics: can't find superclass or
interface java.awt.Graphics
org.apache.poi.hssf.usermodel.EscherGraphics2d: can't find superclass
or interface java.awt.Graphics2D
org.apache.poi.sl.draw.DrawSimpleShape$1: can't find superclass or
interface javax.xml.stream.EventFilter
org.apache.poi.sl.draw.Drawable$DrawableHint: can't find superclass or
interface java.awt.RenderingHints$Key
org.apache.poi.sl.draw.PathGradientPaint: can't find superclass or
interface java.awt.Paint
org.apache.poi.sl.draw.PathGradientPaint$PathGradientContext: can't
find superclass or interface java.awt.PaintContext
org.apache.poi.sl.draw.SLGraphics: can't find superclass or interface
java.awt.Graphics2D org.apache.poi.sl.draw.geom.PresetGeometries$1:
can't find superclass or interface javax.xml.stream.EventFilter
com.fasterxml.jackson.databind.ext.DOMSerializer: can't find
referenced class org.w3c.dom.bootstrap.DOMImplementationRegistry
com.fasterxml.jackson.databind.ext.Java7SupportImpl: can't find
referenced class java.beans.Transient
com.fasterxml.jackson.databind.ext.Java7SupportImpl: can't find
referenced class java.beans.ConstructorProperties
com.fasterxml.jackson.databind.ext.Java7SupportImpl: can't find
referenced class java.beans.Transient
com.fasterxml.jackson.databind.ext.Java7SupportImpl: can't find
referenced class java.beans.ConstructorProperties
com.fasterxml.jackson.databind.ext.Java7SupportImpl: can't find
referenced class java.beans.Transient
com.fasterxml.jackson.databind.ext.Java7SupportImpl: can't find
referenced class java.beans.ConstructorProperties
com.fasterxml.jackson.databind.ext.Java7SupportImpl: can't find
referenced class java.beans.Transient
com.fasterxml.jackson.databind.ext.Java7SupportImpl: can't find
referenced class java.beans.ConstructorProperties
io.jsonwebtoken.impl.Base64Codec: can't find referenced class
javax.xml.bind.DatatypeConverter
io.jsonwebtoken.impl.crypto.EllipticCurveProvider: can't find
referenced class org.bouncycastle.jce.ECNamedCurveTable
org.apache.poi.ddf.EscherMetafileBlip: can't find referenced class
java.awt.Rectangle org.apache.poi.ddf.EscherMetafileBlip: can't find
referenced class java.awt.Dimension
org.apache.poi.ddf.EscherMetafileBlip: can't find referenced class
java.awt.Rectangle org.apache.poi.ddf.EscherMetafileBlip: can't find
referenced class java.awt.Dimension
org.apache.poi.ddf.EscherPictBlip: can't find referenced class
java.awt.Rectangle org.apache.poi.ddf.EscherPictBlip: can't find
referenced class java.awt.Dimension
Errors:
java.lang.RuntimeException: Job failed, see logs for details at
com.android.build.gradle.internal.transforms.ProGuardTransform.transform(ProGuardTransform.java:207)
at
com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:239)
at
com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:235)
at
org.gradle.tooling.internal.provider.ValidatingBuildActionRunner.run(ValidatingBuildActionRunner.java:32)org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
at java.lang.Thread.run(Thread.java:745) Caused by:
java.io.IOException: Please correct the above warnings first. at
proguard.Initializer.execute(Initializer.java:485) at
proguard.ProGuard.initialize(ProGuard.java:271) at
proguard.ProGuard.execute(ProGuard.java:113) at
com.android.build.gradle.internal.transforms.BaseProguardAction.runProguard(BaseProguardAction.java:64)
at
com.android.build.gradle.internal.transforms.ProGuardTransform.doMinification(ProGuardTransform.java:262)
at
com.android.build.gradle.internal.transforms.ProGuardTransform.access$000(ProGuardTransform.java:65)
at
com.android.build.gradle.internal.transforms.ProGuardTransform$1.run(ProGuardTransform.java:176)
at com.android.builder.tasks.Job.runTask(Job.java:47) at
com.android.build.gradle.tasks.SimpleWorkQueue$EmptyThreadContext.runTask(SimpleWorkQueue.java:41)
at com.android.builder.tasks.WorkQueue.run(WorkQueue.java:282) ... 1
more
proguad-rules.pro file
# apache
-keep public class org.apache.poi.** {*;}
What is the problem?

-dontwarn org.apache.poi.**
This solved the issue for me.

use room ORM testing with minify and proguard

I am using room ORM in my project every things good but when i test project with minify minifyEnabled true i face to this error i tried many but did not work. and the following warnings:
Information:Gradle tasks [:app:assembleDebug, :app:assembleDebugAndroidTest]
Warning:org.hamcrest.integration.EasyMock2Adapter: can't find superclass or interface org.easymock.IArgumentMatcher
Warning:org.hamcrest.integration.JMock1Adapter: can't find superclass or interface org.jmock.core.Constraint
Warning:library class android.test.AndroidTestCase extends or implements program class junit.framework.TestCase
Warning:library class android.test.AndroidTestRunner extends or implements program class junit.runner.BaseTestRunner
Warning:library class android.test.InstrumentationTestCase extends or implements program class junit.framework.TestCase
Warning:library class android.test.InstrumentationTestSuite extends or implements program class junit.framework.TestSuite
Warning:library class android.test.suitebuilder.TestSuiteBuilder$FailedToCreateTests extends or implements program class junit.framework.TestCase
Warning:android.support.test.espresso.core.deps.guava.cache.Striped64: can't find referenced class sun.misc.Unsafe
Warning:android.support.test.espresso.core.deps.guava.cache.Striped64$1: can't find referenced class sun.misc.Unsafe
Warning:android.support.test.espresso.core.deps.guava.cache.Striped64$Cell: can't find referenced class sun.misc.Unsafe
Warning:android.support.test.espresso.core.deps.guava.primitives.UnsignedBytes$LexicographicalComparatorHolder$UnsafeComparator: can't find referenced class sun.misc.Unsafe
Warning:android.support.test.espresso.core.deps.guava.primitives.UnsignedBytes$LexicographicalComparatorHolder$UnsafeComparator$1: can't find referenced class sun.misc.Unsafe
Warning:android.support.test.runner.MonitoringInstrumentation: can't find referenced method 'android.app.Instrumentation$ActivityResult execStartActivity(android.content.Context,android.os.IBinder,android.os.IBinder,android.app.Activity,android.content.Intent,int)' in program class android.support.test.internal.runner.hidden.ExposedInstrumentationApi
Warning:android.support.test.runner.MonitoringInstrumentation: can't find referenced method 'android.app.Instrumentation$ActivityResult execStartActivity(android.content.Context,android.os.IBinder,android.os.IBinder,android.app.Activity,android.content.Intent,int,android.os.Bundle)' in program class android.support.test.internal.runner.hidden.ExposedInstrumentationApi
Warning:android.support.test.runner.MonitoringInstrumentation: can't find referenced method 'android.app.Instrumentation$ActivityResult execStartActivity(android.content.Context,android.os.IBinder,android.os.IBinder,android.app.Fragment,android.content.Intent,int,android.os.Bundle)' in program class android.support.test.internal.runner.hidden.ExposedInstrumentationApi
Warning:com.squareup.javawriter.JavaWriter: can't find referenced class javax.lang.model.element.Modifier
Warning:org.hamcrest.JMock1Matchers: can't find referenced class org.jmock.core.Constraint
Warning:org.hamcrest.beans.HasPropertyWithValue: can't find referenced class java.beans.PropertyDescriptor
Warning:org.hamcrest.beans.HasPropertyWithValue$2: can't find referenced class java.beans.PropertyDescriptor
Warning:org.hamcrest.beans.PropertyUtil: can't find referenced class java.beans.PropertyDescriptor
Warning:org.hamcrest.beans.PropertyUtil: can't find referenced class java.beans.Introspector
Warning:org.hamcrest.beans.PropertyUtil: can't find referenced class java.beans.BeanInfo
Warning:org.hamcrest.beans.PropertyUtil: can't find referenced class java.beans.IntrospectionException
Warning:org.hamcrest.beans.PropertyUtil: can't find referenced class java.beans.PropertyDescriptor
Warning:org.hamcrest.beans.PropertyUtil: can't find referenced class java.beans.Introspector
Warning:org.hamcrest.beans.PropertyUtil: can't find referenced class java.beans.BeanInfo
Warning:org.hamcrest.beans.PropertyUtil: can't find referenced class java.beans.PropertyDescriptor
Warning:org.hamcrest.beans.PropertyUtil: can't find referenced class java.beans.IntrospectionException
Warning:org.hamcrest.beans.PropertyUtil: can't find referenced class java.beans.PropertyDescriptor
Warning:org.hamcrest.beans.SamePropertyValuesAs: can't find referenced class java.beans.PropertyDescriptor
Warning:org.hamcrest.beans.SamePropertyValuesAs$PropertyMatcher: can't find referenced class java.beans.PropertyDescriptor
Warning:org.hamcrest.integration.EasyMock2Adapter: can't find referenced class org.easymock.EasyMock
Warning:org.hamcrest.integration.EasyMock2Adapter: can't find referenced class org.easymock.IArgumentMatcher
Warning:org.hamcrest.integration.EasyMock2Adapter: can't find referenced class org.easymock.EasyMock
Warning:org.hamcrest.integration.EasyMock2Adapter: can't find referenced class org.easymock.IArgumentMatcher
Warning:org.hamcrest.integration.JMock1Adapter: can't find referenced class org.jmock.core.Constraint
Warning:org.junit.internal.runners.statements.FailOnTimeout: can't find referenced class java.lang.management.ManagementFactory
Warning:org.junit.internal.runners.statements.FailOnTimeout: can't find referenced class java.lang.management.ThreadMXBean
Warning:org.junit.internal.runners.statements.FailOnTimeout: can't find referenced class java.lang.management.ManagementFactory
Warning:org.junit.internal.runners.statements.FailOnTimeout: can't find referenced class java.lang.management.ThreadMXBean
Warning:org.junit.rules.DisableOnDebug: can't find referenced class java.lang.management.ManagementFactory
Warning:org.junit.rules.DisableOnDebug: can't find referenced class java.lang.management.RuntimeMXBean
Warning:org.junit.rules.DisableOnDebug: can't find referenced class java.lang.management.ManagementFactory
Warning:org.junit.rules.DisableOnDebug: can't find referenced class java.lang.management.RuntimeMXBean
Warning:there were 118 unresolved references to classes or interfaces.
Warning:there were 5 instances of library classes depending on program classes.
Warning:there were 3 unresolved references to program class members.
Warning:Exception while processing task java.io.IOException: Please correct the above warnings first.
Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForDebugAndroidTest'.
> Job failed, see logs for details
Information:BUILD FAILED
Information:Total time: 8.388 secs
Information:1 error
Information:48 warnings
Information:See complete output in console
I think I need to add some procured rules for this android.arch.persistence.room:testing:1.0.0-alpha9 but I don't know what.
thank you for your help.

Getting com.loopj.android.http.AsyncHttpClient after enabling Proguard

I have read this, It looks like its a known issue from quite some time. But i was not receiving any warning or crash when i was not using pro-guard. After enabling it, I am receiving around 500 warnings like following;
Warning:com.loopj.android.http.AsyncHttpClient: can't find referenced
class cz.msebera.android.httpclient
I have tried following, but still all of the warnings are there.
android {
compileSdkVersion 24
buildToolsVersion "24.0.3"
useLibrary 'org.apache.http.legacy'
}
I am not using http-client library, but there may be some other library that I am using in my project is using this.
Warnings
Warning:com.loopj.android.http.RangeFileAsyncHttpResponseHandler: can't find referenced class cz.msebera.android.httpclient.HttpResponse
Warning:com.loopj.android.http.RangeFileAsyncHttpResponseHandler: can't find referenced class cz.msebera.android.httpclient.Header
Warning:com.loopj.android.http.RangeFileAsyncHttpResponseHandler: can't find referenced class cz.msebera.android.httpclient.StatusLine
Warning:com.loopj.android.http.RangeFileAsyncHttpResponseHandler: can't find referenced class cz.msebera.android.httpclient.HttpResponse
Warning:com.loopj.android.http.RangeFileAsyncHttpResponseHandler: can't find referenced class cz.msebera.android.httpclient.HttpEntity
Warning:com.loopj.android.http.RangeFileAsyncHttpResponseHandler: can't find referenced class cz.msebera.android.httpclient.client.methods.HttpUriRequest
Warning:com.loopj.android.http.RequestParams: can't find referenced class cz.msebera.android.httpclient.protocol.HTTP
Warning:com.loopj.android.http.RequestParams: can't find referenced class cz.msebera.android.httpclient.message.BasicNameValuePair
Warning:com.loopj.android.http.RequestParams: can't find referenced class cz.msebera.android.httpclient.client.entity.UrlEncodedFormEntity
Warning:com.loopj.android.http.RequestParams: can't find referenced class cz.msebera.android.httpclient.message.BasicNameValuePair
Warning:com.loopj.android.http.RequestParams: can't find referenced class cz.msebera.android.httpclient.client.utils.URLEncodedUtils
Warning:com.loopj.android.http.RequestParams: can't find referenced class cz.msebera.android.httpclient.message.BasicNameValuePair
Warning:com.loopj.android.http.RequestParams: can't find referenced class cz.msebera.android.httpclient.client.utils.URLEncodedUtils
Warning:com.loopj.android.http.RequestParams: can't find referenced class cz.msebera.android.httpclient.message.BasicNameValuePair
Warning:com.loopj.android.http.RequestParams: can't find referenced class cz.msebera.android.httpclient.HttpEntity
Warning:com.loopj.android.http.RequestParams: can't find referenced class cz.msebera.android.httpclient.message.BasicNameValuePair
Warning:rx.internal.util.unsafe.BaseLinkedQueueConsumerNodeRef: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.BaseLinkedQueueProducerNodeRef: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.ConcurrentCircularArrayQueue: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.ConcurrentSequencedCircularArrayQueue: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.MpmcArrayQueueConsumerField: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.MpmcArrayQueueProducerField: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.MpscLinkedQueue: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.SpmcArrayQueueConsumerField: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.SpmcArrayQueueProducerField: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.SpscArrayQueue: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.SpscArrayQueueConsumerField: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.SpscArrayQueueProducerFields: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.UnsafeAccess: can't find referenced class sun.misc.Unsafe
Warning:library class android.webkit.WebView depends on program class android.net.http.SslCertificate
Warning:library class android.webkit.WebViewClient depends on program class android.net.http.SslError
Warning:library class org.apache.http.conn.ssl.SSLSocketFactory depends on program class org.apache.http.conn.scheme.HostNameResolver
Warning:library class org.apache.http.conn.ssl.SSLSocketFactory depends on program class org.apache.http.params.HttpParams
Warning:library class org.apache.http.params.HttpConnectionParams depends on program class org.apache.http.params.HttpParams
Warning:there were 757 unresolved references to classes or interfaces.
Warning:there were 18 instances of library classes depending on program classes.
Warning:there were 8 unresolved references to program class members.
Warning:there were 2 unresolved references to library class members.
After adding the lines provided in Hitesh Gehlot answer. I am receiving these 5 warnings.
Information:Gradle tasks [:app:assembleRelease]
Warning:com.algolia.search.saas.APIClient: can't find referenced method 'org.json.JSONObject put(java.lang.String,java.util.Collection)' in library class org.json.JSONObject
Warning:com.algolia.search.saas.Index: can't find referenced method 'org.json.JSONObject put(java.lang.String,java.util.Collection)' in library class org.json.JSONObject
Warning:library class android.webkit.WebView depends on program class android.net.http.SslCertificate
Warning:library class android.webkit.WebViewClient depends on program class android.net.http.SslError
Warning:there were 3 instances of library classes depending on program classes.
Warning:there were 2 unresolved references to library class members.
Warning:Exception while processing task java.io.IOException: Please correct the above warnings first.
Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
> java.io.IOException: Please correct the above warnings first.

paste these lines in proguard-rules.pro file
-dontwarn com.loopj.android.http.**
-dontwarn org.apache.http.**
-dontwarn rx.internal.util.**

How to solve Can't find referenced class warnings when building for Amazon?

Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
java.io.IOException: Please correct the above warnings first.
Here are the dependencies of my build.gradle
dependencies {
compile project(':chartboostSDK')
compile project(':flurry_lib')
compile project(':googleCloudMessaging_lib')
compile project(':mainLibProj')
compile project(':localytics_lib')
compile project(':mobihelp_sdk_android_v1534')
compile project(':unityandroidresources')
compile project(':iAB_lib')
compile project(':etcetera_lib')
compile 'com.google.code.gson:gson:2.3.1'
compile 'com.google.android.gms:play-services:+'
compile files('libs/FlurryPlugin.jar')
compile files('libs/FreshdeskPlugin.jar')
compile files('libs/Prime31UnityActivity.jar')
compile files('libs/adcolony-adapter-1.1.6.jar')
compile files('libs/android-bridge.jar')
compile files('libs/apsalar.jar')
compile files('libs/apsalarUnity3d.jar')
compile files('libs/bolts-android-1.2.1.jar')
compile files('libs/chartboost-adapter-1.0.6.jar')
compile files('libs/crittercism_v5_4_3_sdkonly.jar')
compile files('libs/dagger.jar')
compile files('libs/emojiplugin.jar')
compile files('libs/in-app-purchasing-2.0.61.jar')
compile files('libs/javax.inject.jar')
compile files('libs/mediationsdk-6.3.5.jar')
compile files('libs/nativex-adapter-1.0.3.jar')
compile files('libs/nineoldandroids.jar')
compile 'com.android.support:support-annotations:23.1.1'
compile files('libs/tapjoyconnectlibrary.jar')
compile files('libs/tapjoyunitywrapper.jar')
compile files('libs/unity-classes.jar')
compile files('libs/vungle-adapter-1.1.6.jar')
compile files('libs/unity-classes.jar')
}
Here is the list of warnings
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.framework.prompt.PromptContent
Warning:com.vungle.publisher.location.GoogleLocationClientDetailedLocationProvider: can't find superclass or interface com.google.android.gms.common.GooglePlayServicesClient$OnConnectionFailedListener
Warning:com.prime31.FlurryPlugin$2: can't find referenced class com.flurry.android.FlurryAgent
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.framework.prompt.PromptManager
Warning:com.amazon.device.iap.internal.b.b: can't find referenced class com.amazon.android.framework.prompt.PromptContent
Warning:com.supersonic.unity.androidbridge.AndroidBridge: can't find referenced class com.supersonic.adapters.hyprmx.HyprMXConfig
Warning:com.prime31.FlurryPlugin$6: can't find referenced class com.flurry.android.FlurryAgent
Warning:com.prime31.FlurryPlugin$11: can't find referenced class com.flurry.android.FlurryAds
Warning:com.prime31.FlurryPlugin$12: can't find referenced class com.flurry.android.FlurryAds
Warning:com.amazon.device.iap.internal.b.b.a: can't find referenced class com.amazon.android.framework.context.ContextManager
Warning:com.amazon.device.iap.internal.b.c.b: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.b: can't find referenced class com.amazon.android.framework.prompt.SimplePrompt
Warning:com.amazon.device.iap.internal.b.b.a: can't find referenced class com.amazon.android.framework.task.TaskManager
Warning:com.amazon.device.iap.internal.b.b.b: can't find referenced method 'void preExecution()' in program class com.amazon.device.iap.internal.b.b.a
Warning:com.freshdeskplugin.freshdesksupport.UnitySupport: can't find referenced class com.freshdesk.mobihelp.UnreadUpdatesCallback
Warning:com.amazon.device.iap.internal.b.b.b: can't find referenced class com.amazon.android.framework.exception.KiwiException
Warning:com.freshdeskplugin.freshdesksupport.UnitySupport: can't find referenced class com.freshdesk.mobihelp.MobihelpConfig
Warning:com.amazon.device.iap.internal.b.i: can't find superclass or interface com.amazon.android.framework.task.command.AbstractCommandTask
Warning:com.freshdeskplugin.freshdesksupport.UnitySupport: can't find referenced class com.freshdesk.mobihelp.FeedbackType
Warning:com.amazon.device.iap.internal.b.h.a: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.framework.exception.KiwiException
Warning:com.amazon.device.iap.internal.b.b.a: can't find referenced class com.amazon.android.framework.exception.KiwiException
Warning:com.vungle.publisher.location.GoogleLocationClientDetailedLocationProvider: can't find referenced class com.google.android.gms.common.GooglePlayServicesClient$OnConnectionFailedListener
Warning:com.supersonic.unity.androidbridge.AndroidBridge: can't find referenced class com.supersonic.adapters.unityads.UnityAdsConfig
Warning:com.supersonic.unity.androidbridge.AndroidBridge: can't find referenced class com.supersonic.adapters.flurry.FlurryConfig
Warning:com.prime31.FlurryPlugin$12: can't find referenced class com.flurry.android.FlurryAdSize
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.framework.exception.KiwiException
Warning:com.supersonic.unity.androidbridge.AndroidBridge: can't find referenced class com.supersonic.adapters.applovin.AppLovinConfig
Warning:com.amazon.device.iap.internal.b.e.d: can't find referenced class com.amazon.android.framework.exception.KiwiException
Warning:com.prime31.FlurryPlugin: can't find referenced class com.flurry.android.FlurryAdListener
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.framework.exception.KiwiException
Warning:com.freshdeskplugin.freshdesksupport.UnitySupport: can't find referenced class com.freshdesk.mobihelp.MobihelpConfig
Warning:com.prime31.FlurryPlugin: can't find referenced class com.flurry.android.FlurryAgent
Warning:com.amazon.device.iap.internal.b.a.b: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.b: can't find referenced class com.amazon.android.framework.prompt.SimplePrompt
Warning:com.amazon.device.iap.internal.b.b.a: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.framework.task.command.AbstractCommandTask
Warning:com.prime31.FlurryPlugin: can't find superclass or interface com.flurry.android.FlurryAdListener
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.vungle.publisher.location.GoogleLocationClientDetailedLocationProvider: can't find referenced class com.google.android.gms.location.LocationClient
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.Kiwi
Warning:com.amazon.device.iap.internal.b.e.c: can't find referenced class com.amazon.android.framework.exception.KiwiException
Warning:com.supersonic.unity.androidbridge.AndroidBridge: can't find referenced class com.supersonic.adapters.hyprmx.HyprMXConfig
Warning:com.amazon.device.iap.internal.b.b: can't find referenced class com.amazon.android.framework.prompt.PromptContent
Warning:com.amazon.device.iap.internal.util.a: can't find referenced class com.amazon.android.Kiwi
Warning:com.prime31.FlurryPlugin$9: can't find referenced class com.flurry.android.FlurryAdSize
Warning:com.prime31.FlurryPlugin$10: can't find referenced class com.flurry.android.FlurryAds
Warning:com.amazon.device.iap.internal.b.b: can't find referenced class com.amazon.android.framework.resource.Resource
Warning:com.vungle.publisher.location.GoogleLocationClientDetailedLocationProvider: can't find referenced class com.google.android.gms.common.GooglePlayServicesClient$ConnectionCallbacks
Warning:com.tapjoy.internal.a$g: can't find referenced method 'void setLatestEventInfo(android.content.Context,java.lang.CharSequence,java.lang.CharSequence,android.app.PendingIntent)' in library class android.app.Notification
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.licensing.LicenseFailurePromptContentMapper
Warning:com.tapjoy.internal.ii: can't find referenced method 'org.apache.http.conn.ssl.SSLSocketFactory getHttpSocketFactory(int,android.net.SSLSessionCache)' in library class android.net.SSLCertificateSocketFactory
Warning:com.vungle.publisher.location.GoogleLocationClientDetailedLocationProvider: can't find superclass or interface com.google.android.gms.common.GooglePlayServicesClient$ConnectionCallbacks
Warning:com.amazon.device.iap.internal.b.b: can't find referenced class com.amazon.android.framework.context.ContextManager
Warning:com.vungle.publisher.location.GoogleLocationClientDetailedLocationProvider: can't find referenced class com.google.android.gms.common.GooglePlayServicesClient$OnConnectionFailedListener
Warning:com.amazon.device.iap.internal.b.b.a: can't find referenced class com.amazon.android.framework.task.TaskManager
Warning:com.amazon.device.iap.internal.b.g.a: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.b: can't find referenced class com.amazon.android.framework.context.ContextManager
Warning:com.amazon.device.iap.internal.b.b.a$1: can't find referenced class com.amazon.android.framework.context.ContextManager
Warning:com.supersonic.unity.androidbridge.AndroidBridge: can't find referenced class com.supersonic.adapters.applovin.AppLovinConfig
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.licensing.LicenseFailurePromptContentMapper
Warning:com.freshdeskplugin.freshdesksupport.UnitySupport$1: can't find superclass or interface com.freshdesk.mobihelp.UnreadUpdatesCallback
Warning:com.tapjoy.internal.km: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:com.prime31.FlurryPlugin$1: can't find referenced class com.flurry.android.FlurryAgent
Warning:com.freshdeskplugin.freshdesksupport.UnitySupport: can't find referenced class com.freshdesk.mobihelp.FeedbackType
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.Kiwi
Warning:com.prime31.FlurryPlugin$9: can't find referenced class com.flurry.android.FlurryAds
Warning:com.supersonic.unity.androidbridge.AndroidBridge: can't find referenced class com.supersonic.adapters.unityads.UnityAdsConfig
Warning:com.amazon.device.iap.internal.b.b.a: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.vungle.publisher.location.GoogleLocationClientDetailedLocationProvider: can't find referenced class com.google.android.gms.common.GooglePlayServicesClient
Warning:com.amazon.device.iap.internal.b.c.b: can't find referenced class com.amazon.android.framework.exception.KiwiException
Warning:com.amazon.device.iap.internal.b.b.a: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.freshdeskplugin.freshdesksupport.UnitySupport$1: can't find referenced class com.freshdesk.mobihelp.MobihelpCallbackStatus
Warning:com.freshdeskplugin.freshdesksupport.UnitySupport: can't find referenced class com.freshdesk.mobihelp.Mobihelp
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.venezia.command.FailureResult
Warning:com.amazon.device.iap.internal.b.b.a: can't find referenced class com.amazon.android.framework.task.TaskManager
Warning:com.prime31.FlurryPlugin$7: can't find referenced class com.flurry.android.FlurryAgent
Warning:com.supersonic.unity.androidbridge.AndroidBridge: can't find referenced class com.supersonic.adapters.flurry.FlurryConfig
Warning:com.prime31.FlurryPlugin$10: can't find referenced class com.flurry.android.FlurryAdSize
Warning:com.amazon.device.iap.internal.b.f: can't find referenced class com.amazon.android.framework.util.KiwiLogger
Warning:com.prime31.FlurryPlugin$10: can't find referenced class com.flurry.android.FlurryAdSize
Warning:com.vungle.publisher.location.GoogleLocationClientDetailedLocationProvider: can't find referenced class com.google.android.gms.common.GooglePlayServicesClient$ConnectionCallbacks
Warning:com.tapjoy.internal.ii$1: can't find referenced method 'org.apache.http.conn.ssl.SSLSocketFactory getHttpSocketFactory(int,android.net.SSLSessionCache)' in library class android.net.SSLCertificateSocketFactory
Warning:com.freshdeskplugin.freshdesksupport.UnitySupport: can't find referenced class com.freshdesk.mobihelp.MobihelpConfig
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.venezia.command.FailureResult
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.licensing.LicenseFailurePromptContentMapper
Warning:com.prime31.FlurryPlugin$5: can't find referenced class com.flurry.android.FlurryAgent
Warning:com.freshdeskplugin.freshdesksupport.UnitySupport: can't find referenced class com.freshdesk.mobihelp.MobihelpConfig
Warning:com.amazon.device.iap.internal.b.a.a: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.b.a$1: can't find superclass or interface com.amazon.android.framework.task.Task
Warning:com.amazon.device.iap.internal.b.d.d: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.g.a: can't find referenced class com.amazon.android.framework.exception.KiwiException
Warning:com.amazon.device.iap.internal.b.c.a: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.b.a: can't find referenced class com.amazon.android.framework.task.pipeline.TaskPipelineId
Warning:com.amazon.device.iap.internal.b.f.a: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.tapjoy.internal.a$h: can't find referenced method 'void setLatestEventInfo(android.content.Context,java.lang.CharSequence,java.lang.CharSequence,android.app.PendingIntent)' in library class android.app.Notification
Warning:com.amazon.device.iap.internal.b.d.c: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.e.c: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.venezia.command.FailureResult
Warning:com.amazon.device.iap.internal.b.b.a: can't find referenced class com.amazon.android.framework.resource.Resource
Warning:com.prime31.FlurryPlugin$12: can't find referenced class com.flurry.android.FlurryAdSize
Warning:com.amazon.device.iap.internal.b.e.d: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.b.a$1: can't find referenced class com.amazon.android.framework.task.Task
Warning:com.freshdeskplugin.freshdesksupport.UnitySupport: can't find referenced class com.freshdesk.mobihelp.Mobihelp
Warning:com.amazon.device.iap.internal.b.h.a: can't find referenced class com.amazon.android.framework.exception.KiwiException
Warning:com.prime31.FlurryPlugin$9: can't find referenced class com.flurry.android.FlurryAdSize
Warning:com.prime31.FlurryPlugin$3: can't find referenced class com.flurry.android.FlurryAgent
Warning:com.prime31.FlurryPlugin: can't find referenced class com.flurry.android.FlurryAdType
Warning:com.prime31.FlurryPlugin$4: can't find referenced class com.flurry.android.FlurryAgent
Warning:com.amazon.device.iap.internal.b.b: can't find referenced class com.amazon.android.framework.prompt.PromptContent
Warning:com.prime31.FlurryPlugin: can't find referenced class com.flurry.android.FlurryAds
Warning:com.amazon.device.iap.internal.b.b.a: can't find referenced class com.amazon.android.framework.task.pipeline.TaskPipelineId
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.framework.prompt.PromptContent
Warning:com.freshdeskplugin.freshdesksupport.UnitySupport: can't find referenced class com.freshdesk.mobihelp.FeedbackType
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.venezia.command.SuccessResult
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.framework.task.command.AbstractCommandTask
Warning:com.amazon.device.iap.internal.b.b: can't find superclass or interface com.amazon.android.framework.prompt.SimplePrompt
Warning:com.amazon.device.iap.internal.b.b.a: can't find referenced class com.amazon.android.framework.resource.Resource
Warning:com.prime31.FlurryPlugin$8: can't find referenced class com.flurry.android.FlurryAds
Warning:com.freshdeskplugin.freshdesksupport.UnitySupport$1: can't find referenced class com.freshdesk.mobihelp.UnreadUpdatesCallback
Warning:com.amazon.device.iap.internal.b.b.a$1: can't find referenced class com.amazon.android.framework.context.ContextManager
Warning:com.amazon.device.iap.internal.b.d.b: can't find referenced class com.amazon.android.framework.exception.KiwiException
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.framework.prompt.PromptContent
Warning:com.amazon.device.iap.internal.b.c.a: can't find referenced class com.amazon.android.framework.exception.KiwiException
Warning:com.amazon.device.iap.internal.b.i: can't find referenced class com.amazon.android.framework.prompt.PromptManager
Warning:com.amazon.device.iap.internal.b.d.b: can't find referenced method 'void preExecution()' in program class com.amazon.device.iap.internal.b.i
Warning:there were 214 unresolved references to classes or interfaces.
You may need to add missing library jars or update their versions.
If your code works fine without the missing classes, you can suppress
the warnings with '-dontwarn' options.
Warning:there were 2 unresolved references to program class members.
(http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedclass)
You may need to recompile the code.
Your input classes appear to be inconsistent.
Warning:there were 4 unresolved references to library class members.
You probably need to update the library versions.
Warning:Exception while processing task java.io.IOException: Please correct the above warnings first.
:starChef:transformClassesAndResourcesWithProguardForRelease FAILED

Normally Amazon suggests including the following in your ProGuard configuration file:
-dontwarn com.amazon.**
-keep class com.amazon.** {*;}
-keepattributes *Annotation*
and also skipping ProGuard's optimization:
-dontoptimize
However, in my personal experience, including suggestions from numerous other SO posts, none of that worked. In the end I had to turn off obfuscation (minifyEnabled false) to build for Amazon, which produced the release build:
android {
...
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'),
'proguard-rules.pro'
}
}
}
You may also want to experiment by adding this to your ProGuard settings:
-dontshrink
-keep class org.apache.** {*;}
-keepclasseswithmembernames class * {
native <methods>;
}

May be you are mismatching between
sdk version
Build Tools
Gradle Plugins
in terms of compatibility.
To resolve it, verify that you are using the latest versions of them. The gradle plugins are placed in the build.gradle of the project, and the other versions are on the build.gradle of the module.
For example, for SDK 23, you can use the Build Tools 23.0.1 and gradle plugins version 1.3.1.
clean it after change settings.

If you have several modules in your project, try to add
-dontwarn com.amazon.**
-keep class com.amazon.** {*;}
-keepattributes *Annotation*
-dontoptimize
to each proguard-rules.pro file in these modules.
For example, if you have two modules: base and installed, add the lines to both files:
base/proguard-rules.pro
installed/proguard-rules.pro

Android Volley Signed Apk Issue

I am working with an application where I am using volley plus with android studio. I am using volley plus gradle version 'dev.dworks.libs:volleyplus:+' gradle. When I make signed apk of my app my build process terminated with some warning and errors with runProguard true. There is any solution to solve this.
Warning:com.android.volley.toolbox.HttpClientStack$HttpPatch: can't find superclass or interface org.apache.http.client.methods.HttpEntityEnclosingRequestBase
Warning:com.android.volley.toolbox.multipart.MultipartEntity: can't find superclass or interface org.apache.http.entity.AbstractHttpEntity
Warning:com.android.volley.cache.SimpleImageLoader: can't find referenced class android.net.http.AndroidHttpClient
Warning:com.android.volley.cache.plus.SimpleImageLoader: can't find referenced class android.net.http.AndroidHttpClient
Warning:com.android.volley.misc.MultipartUtils: can't find referenced class org.apache.http.util.EncodingUtils
Warning:com.android.volley.misc.Utils: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.misc.Utils: can't find referenced class org.apache.http.Header
Warning:com.android.volley.misc.Utils: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.misc.Utils: can't find referenced class org.apache.http.Header
Warning:com.android.volley.misc.Utils: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.misc.Utils: can't find referenced class org.apache.http.Header
Warning:com.android.volley.misc.Utils: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.StatusLine
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.impl.cookie.DateUtils
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.HttpEntity
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.Header
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.StatusLine
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.HttpEntity
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.StatusLine
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.impl.cookie.DateUtils
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.HttpEntity
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.Header
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.StatusLine
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.StatusLine
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.HttpEntity
Warning:com.android.volley.toolbox.BasicNetwork: can't find referenced class org.apache.http.Header
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpUriRequest
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.message.BasicNameValuePair
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpUriRequest
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.HttpClient
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpPost
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.entity.ByteArrayEntity
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpPost
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpGet
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpDelete
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpPut
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpHead
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpOptions
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpTrace
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpEntityEnclosingRequestBase
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpUriRequest
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.HttpClient
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpEntityEnclosingRequestBase
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.HttpClient
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpUriRequest
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.NameValuePair
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpUriRequest
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpUriRequest
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpPost
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.HttpEntity
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpPost
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpPut
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpUriRequest
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpEntityEnclosingRequestBase
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.HttpEntity
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpEntityEnclosingRequestBase
Warning:com.android.volley.toolbox.HttpClientStack: can't find referenced class org.apache.http.client.methods.HttpUriRequest
Warning:com.android.volley.toolbox.HttpClientStack$HttpPatch: can't find referenced class org.apache.http.client.methods.HttpEntityEnclosingRequestBase
Warning:com.android.volley.toolbox.HttpClientStack$HttpPatch: can't find referenced method 'void setURI(java.net.URI)' in program class com.android.volley.toolbox.HttpClientStack$HttpPatch
Warning:com.android.volley.toolbox.HttpClientStack$HttpPatch: can't find referenced class org.apache.http.client.methods.HttpEntityEnclosingRequestBase
Warning:com.android.volley.toolbox.HttpHeaderParser: can't find referenced class org.apache.http.impl.cookie.DateUtils
Warning:com.android.volley.toolbox.HttpHeaderParser: can't find referenced class org.apache.http.impl.cookie.DateParseException
Warning:com.android.volley.toolbox.HttpHeaderParser: can't find referenced class org.apache.http.impl.cookie.DateUtils
Warning:com.android.volley.toolbox.HttpHeaderParser: can't find referenced class org.apache.http.impl.cookie.DateParseException
Warning:com.android.volley.toolbox.HttpStack: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.ProtocolVersion
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.message.BasicStatusLine
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.message.BasicHttpResponse
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.message.BasicHeader
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.message.BasicHttpResponse
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.entity.BasicHttpEntity
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.ProtocolVersion
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.StatusLine
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.message.BasicHttpResponse
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.entity.BasicHttpEntity
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.Header
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.ProtocolVersion
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.StatusLine
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.message.BasicHttpResponse
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.HttpResponse
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.HttpEntity
Warning:com.android.volley.toolbox.HurlStack: can't find referenced class org.apache.http.entity.BasicHttpEntity
Warning:com.android.volley.toolbox.Volley: can't find referenced class android.net.http.AndroidHttpClient
Warning:com.android.volley.toolbox.VolleyTickle: can't find referenced class android.net.http.AndroidHttpClient
Warning:com.android.volley.toolbox.multipart.BasePart: can't find referenced class org.apache.http.util.ByteArrayBuffer
Warning:com.android.volley.toolbox.multipart.BasePart: can't find referenced class org.apache.http.util.EncodingUtils
Warning:com.android.volley.toolbox.multipart.BasePart: can't find referenced class org.apache.http.util.ByteArrayBuffer
Warning:com.android.volley.toolbox.multipart.BasePart: can't find referenced class org.apache.http.util.EncodingUtils
Warning:com.android.volley.toolbox.multipart.BasePart: can't find referenced class org.apache.http.util.ByteArrayBuffer
Warning:com.android.volley.toolbox.multipart.Boundary: can't find referenced class org.apache.http.util.EncodingUtils
Warning:com.android.volley.toolbox.multipart.MultipartEntity: can't find referenced class org.apache.http.entity.AbstractHttpEntity
Warning:com.android.volley.toolbox.multipart.MultipartEntity: can't find referenced method 'void setContentType(java.lang.String)' in program class com.android.volley.toolbox.multipart.MultipartEntity
Warning:com.android.volley.toolbox.multipart.MultipartEntity: can't find referenced class org.apache.http.entity.AbstractHttpEntity
Warning:com.android.volley.ui.PhotoView: can't find referenced method 'float sqrt(float)' in library class android.util.FloatMath
Warning:com.rey.material.drawable.ContactChipDrawable: can't find referenced method 'float ceil(float)' in library class android.util.FloatMath
Warning:com.rey.material.text.style.ContactChipSpan: can't find referenced method 'float ceil(float)' in library class android.util.FloatMath
Warning:there were 158 unresolved references to classes or interfaces.
You may need to add missing library jars or update their versions.
If your code works fine without the missing classes, you can suppress
the warnings with '-dontwarn' options.
(http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedclass)
Warning:there were 2 unresolved references to program class members.
Your input classes appear to be inconsistent.
You may need to recompile the code.
(http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedprogramclassmember)
Warning:there were 3 unresolved references to library class members.
You probably need to update the library versions.
(http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedlibraryclassmember)
:app:proguardRelease FAILED
Error:Execution failed for task ':app:proguardRelease'.
> java.io.IOException: Please correct the above warnings first.

Use this code in ProGuard:
-dontwarn org.apache.http.**
-dontwarn android.net.http.AndroidHttpClient
-dontwarn com.google.android.gms.**
-dontwarn com.android.volley.toolbox.**

Since android API 23 Apache HTTP Client is removed from Android:
https://developer.android.com/about/versions/marshmallow/android-6.0-changes.html#behavior-apache-http-client
But Volley still uses it, that's why there is warn about can't find referenced class
We can ignore these warns, because Volley is still compiled using API 22:
https://github.com/mcxiaoke/android-volley/blob/master/gradle.properties
Still should think about other better libray like OkHttp, which uses HttpURLConnection, if Volley doesn't update in the future.