为了更好的管理依赖包的版本以及编译sdk的版本号，这里单独抽出一个dependency.gradle来做统一管理

• 在项目build.gradle同级的根目录下创建dependency.gradle，内容如下

  ext {
        extAndroid = [
        compileSdkVersion: 26,
        minSdkVersion    : 18,
        targetSdkVersion : 26
        ]
  extDependencies = [
        appcompat          : 'com.android.support:appcompat-v7:24.2.1',
        constraint_layout  : 'com.android.support.constraint:constraint-layout:1.0.2',
        gson               : 'com.google.code.gson:gson:2.8.1',
        butterknife        : 'com.jakewharton:butterknife:8.7.0',
        butterknife_compile: 'com.jakewharton:butterknife-compiler:8.7.0',
        ormlite_core       : 'com.j256.ormlite:ormlite-core:5.0',
        ormlite_android    : 'com.j256.ormlite:ormlite-android:5.0',
        design             : 'com.android.support:design:24.2.1',
        okhttp             : 'com.squareup.okhttp3:okhttp:3.2.0',
        junit              : 'junit:junit:4.12',
        test_runner        : 'com.android.support.test:runner:1.0.1',
        test_espresso      : 'com.android.support.test.espresso:espresso-core:3.0.1'
       ]
  }
  

• 在build.gradle中添加apply from: './dependency.gradle',使得dependency.gradle内容可以被其他的.gradle文件直接引用。

• 在app目录下的build.gradle中使用

   compileSdkVersion extAndroid['compileSdkVersion']
   defaultConfig {
   applicationId "com.simple"
   minSdkVersion extAndroid['minSdkVersion']
   targetSdkVersion extAndroid['targetSdkVersion']
   versionCode 1
   versionName "1.0"
   testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
   }
  -----------------------------------------------------------------------------
  dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation extDependencies['appcompat']
    implementation extDependencies['constraint_layout']
    testImplementation extDependencies['junit']
    androidTestImplementation extDependencies['test_runner']
    androidTestImplementation extDependencies['test_espresso']
  }
  

对布局文件进行分包处理

• res目录右键新建res folder

  
  
  20180326113413.png

• 相对应的build.gradle中将添加

  sourceSets {
    main {
    res.srcDirs = ['src/main/res',
                   'src/main/res/layouts',
                   'src/main/res/layouts/login',
                   'src/main/res/layouts/main',
                   'src/main/res/layouts/setting']
      }
  }