Kotlin作为安卓的第一语言学习下还是必要的不废话上干货

新建项目配置gradle

buildscript {
    ext{
        kotlin_version = '1.3.71'    
        version_lifecycle_extensions = "2.2.0"
        version_lifecycle = "2.2.0"
        version_room = "2.2.5"   
        version_appcompat = "1.2.0"  
        version_fragment = "1.0.0"  
        version_core = "1.3.2"
        version_coroutine = "1.3.6"
        version_navigation = '1.0.0'
        version_constraint_layout = "2.0.0-rc1"
        version_retrofit_coroutines_adapter = "0.9.2"
        version_joda = "2.10"
        version_retrofit = "2.5.0"
        version_timber = "4.7.1"
        version_work = "1.0.1"
        version_glide = "4.11.0"
        version_moshi = "1.8.0"
    }

    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.3'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "android.arch.navigation:navigation-safe-args-gradle-plugin:$anvigationVertion"
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        maven { url "https://jitpack.io" }
        
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

这是项目的gradle文件我这边用的androidStudio 版本为3.6.3 接下来看下app的gradle 文件

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'
apply plugin: 'androidx.navigation.safeargs'

android {
    compileSdkVersion 30
    buildToolsVersion "29.0.3"

    defaultConfig {
        applicationId "com.example.application"
        minSdkVersion 19
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
        vectorDrawables.useSupportLibrary = true

    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    dataBinding {
        enabled = true
    }

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"

    // Support libraries
    implementation "androidx.appcompat:appcompat:$version_appcompat"
    implementation "androidx.fragment:fragment:$version_fragment"
    implementation "androidx.constraintlayout:constraintlayout:$version_constraint_layout"
    // Android KTX
    implementation "androidx.core:core-ktx:$version_core"

    // Navigation
    implementation "android.arch.navigation:navigation-fragment-ktx:$version_navigation"
    implementation "android.arch.navigation:navigation-ui-ktx:$version_navigation"

    // Coroutines for getting off the UI thread
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$version_core"
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$version_coroutine"

    // Retrofit for networking
    implementation "com.squareup.retrofit2:retrofit:$version_retrofit"
    implementation "com.squareup.retrofit2:converter-moshi:$version_retrofit"
    implementation "com.jakewharton.retrofit:retrofit2-kotlin-coroutines-adapter:$version_retrofit_coroutines_adapter"

    // Joda time library for dealing with time
    implementation "joda-time:joda-time:$version_joda"

    // ViewModel and LiveData (arch components)
    implementation "androidx.lifecycle:lifecycle-extensions:$version_lifecycle_extensions"
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$version_lifecycle"

    // Logging
    implementation "com.jakewharton.timber:timber:$version_timber"

    // Glide for images
    implementation "com.github.bumptech.glide:glide:$version_glide"
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    annotationProcessor "com.github.bumptech.glide:compiler:$version_glide"
    kapt "com.github.bumptech.glide:compiler:$version_glide"

    // Moshi for parsing the JSON format
    implementation "com.squareup.moshi:moshi:$version_moshi"
    implementation "com.squareup.moshi:moshi-kotlin:$version_moshi"

    // Room database
    implementation "androidx.room:room-runtime:$version_room"
    kapt "androidx.room:room-compiler:$version_room"
    testImplementation "androidx.room:room-testing:$version_room"
    annotationProcessor "androidx.room:room-compiler:$version_room"

    // Kotlin Extensions and Coroutines support for Room
    implementation "androidx.room:room-ktx:$version_room"
    implementation "androidx.slice:slice-builders-ktx:1.0.0-alpha07"
    implementation "androidx.sqlite:sqlite-ktx:2.1.0"

    // WorkManager
    implementation "android.arch.work:work-runtime-ktx:$version_work"

    implementation "com.tencent:mmkv:1.0.19"
    implementation "com.github.CymChad:BaseRecyclerViewAdapterHelper:3.0.2"
    implementation "com.qmuiteam:qmui:2.0.0-alpha07"
    implementation "me.jessyan:autosize:1.1.1"



    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

这里的依赖项包含了大部分常用的组件和框架
需要注意的是AndroidStudio4.0以上版本app的gradle配置开启databinding 变更

    dataBinding {
        enabled = true
    }
  //  改成
    buildFeatures {
        dataBinding true
    }

manifest文件配置

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.application">
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:requestLegacyExternalStorage="true"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:usesCleartextTraffic="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <!--autosize   这个配置为屏幕适配需要必须设置 除非不用autosize-->
        <meta-data
            android:name="design_width_in_dp"
            android:value="375" />
        <meta-data
            android:name="design_height_in_dp"
            android:value="667" />
        <!-- autosize -->
      <!-- fonts  这个为字体配置-->
        <meta-data
            android:name="preloaded_fonts"
            android:resource="@array/preloaded_fonts" />
      <!-- fonts-->
     
       <!-- provider  文件共享-->
        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="${applicationId}.generic.file.provider"
            android:grantUriPermissions="true"
            android:exported="false">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
        </provider>
  <!-- provider-->
    </application>

</manifest>