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Error:Execution failed for task ':app:transformClassesWithDexForDebug'. > com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command '/usr/lib/jvm/java-7-oracle/bin/java'' finished with non-zero exit value 3

解决：

在build.gradle中添加：

dexOptions {

        javaMaxHeapSize "4g" //specify the heap size for the dex process

        preDexLibraries = false //delete the already predexed libraries

    }
如下：

apply plugin: 'com.android.application'

android {

    compileSdkVersion 23

    buildToolsVersion "23.0.1"

    defaultConfig {

        applicationId "com.myapplicationname.app"

        minSdkVersion 15

        targetSdkVersion 23

        versionCode 1

        versionName "1.0"

        multiDexEnabled true

    }

  //====================Add below two line=============

    dexOptions {

        javaMaxHeapSize "4g" //specify the heap size for the dex process

        preDexLibraries = false //delete the already predexed libraries

    }

    buildTypes {

        release {

            minifyEnabled false

            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

        }

    }

    packagingOptions {

        exclude 'META-INF/DEPENDENCIES'

        exclude 'META-INF/NOTICE'

        exclude 'META-INF/LICENSE'

        exclude 'META-INF/LICENSE.txt'

        exclude 'META-INF/NOTICE.txt'

    }

    useLibrary 'org.apache.http.legacy'

}

dependencies {

    compile fileTree(dir: 'libs', include: ['*.jar'])

    testCompile 'junit:junit:4.12'

    compile 'com.android.support:appcompat-v7:23.0.1'

    compile 'com.android.support:design:23.0.1'

    compile 'com.google.android.gms:play-services:8.3.0'

    compile files('libs/gcm.jar')

    compile 'com.android.support:multidex:1.0.1'

    compile 'org.apache.httpcomponents:httpcore:4.4.4'

    compile('org.apache.httpcomponents:httpmime:4.3.6') {

        exclude module: "httpclient"

    }

    //facebook sdk

    compile 'com.facebook.android:facebook-android-sdk:4.7.0'

    compile 'org.apache.httpcomponents:httpcore:4.4.3'

    compile 'com.paypal.sdk:paypal-android-sdk:2.12.4'

    //facebook sdk

    compile 'com.facebook.android:facebook-android-sdk:4.7.0'

}