android studio 使用问题 解决方法

1、

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'

}