0 Gradle 依賴總結1 Gradle 編譯，lintb報錯配置： android-lintOptions - 遮蔽android {     lintOptions {        abortOnError false        // if true, only report errors.        ignoreWarnings true    }}2 Gradle 新增aar配置： android-repositories- 新增libsandroid {     repositories {         flatDir {         dirs 'libs'        }     }}dependencies {    compile(name:'com.netposa.ffmpeg', ext:'aar')}3 Gradle JNI配置預設放入jniLibs 中如果 libs/aar 檔案中有 libs/包含so 需要： 指定jni 路徑android {     sourceSets {    main {         jniLibs.srcDirs = ['libs']     }}4 Gradle 修改資料表結構需要：增加Version 版本號android {     greendao {        //版本號，升級時可配置        schemaVersion 2    }}5 Gradle 模組間的jar 引用在主模組中，通過api可以複用子模組中的jar 包引用api project(':jpush')dependencies {    api files('libs/jcore-android-1.1.9.jar')     api files('libs/jpush-android-3.1.1.jar')}6 Gradle rootProject需要：通過在根目錄下，設定ext 物件ext {    // Sdk and tools    compileSdkVersion = 26}子模組中可以通過compileSdkVersion rootProject.ext.compileSdkVersionminSdkVersion rootProject.ext.minSdkVersion7 Gradle中配置Multidexandroid {    defaultConfig {// Enabling multidex support.        multiDexEnabled true    }}dependencies {  compile 'com.android.support:multidex:1.0.1'}Myapplication要繼承android.support.multidex.MultiDexApplication8 Gradle Version name Hash值配置1 新建 common.gradle 配置檔案gradle.allprojects {     ext.getGitHeadRefsSuffix = {        if(ext.releaseVer){            return "";         }            try {            def headFile = new File('.git/HEAD')            if (headFile.exists()) {                 String[] strings = headFile.getText('UTF-8').split(" ");                if (strings.size() > 1) {                     String refFilePath = '.git/' + strings[1];                    def refFile = new File(refFilePath.replace("\n", ""));                    return "_" + refFile.getText('UTF-8').substring(0, 8)                 }             }         } catch (Exception e) {             e.printStackTrace()         }        return ""    }}2 在VersionName的gradle處引用apply from: 'common.gradle'3 使用versionName = '1.0.2'+getGitHeadRefsSuffix()

9 Gradle 報錯

Error:Unable to find method 'com.android.build.gradle.api.BaseVariant.getOutputs()Ljava/util/List;'.Possible causes for this unexpected error include:<ul><li>Gradle's dependency cache may be corrupt (this sometimes occurs after a network connection timeout.)原因是：Android Studio3.0與butterknife的衝突，github上面已經有了這個問題issue，暫時的解決方法是降至8.4的版本。

10  BuildConfig 直接配置全域性常量

可以在build.gradle 中配置新增android {  
    buildTypes {  
        debug {  
            buildConfigField "String", "URL",   "\"http://www.baidu.com/\""  
            buildConfigField "int",    "MONEY",  "1000"  
        }  
        release {  
            minifyEnabled false  
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'  
        }  
    }  
} 

11 升級到AS 3.0 註解報錯

1. Execution failed for task ':app:javaPreCompileDebug'.
2. > Annotation processors must be explicitly declared now.
3. Alternatively, set android.defaultConfig.javaCompileOptions.annotationProcessorOptions.includeCompileClasspath = true
4. to continue with previous behavior. Note that this option is deprecated and will be removed in the future.
   
5. 需要設定

javaCompileOptions {
    annotationProcessorOptions {
        includeCompileClasspath = true
    }
}//顯示註解支援