以前就一直有使用Android Studio去開(kāi)發(fā)系統(tǒng)應(yīng)用的想法，后來(lái)由于各種原因，一直未果，網(wǎng)上也沒(méi)有比較詳細(xì)的教程示例，由此寫(xiě)下這篇文章，覺(jué)得可以名正言順的使用了。至此正式拋棄干兒子eclipse，使用Google親兒子Android Studio開(kāi)發(fā)系統(tǒng)級(jí)應(yīng)用。

一、導(dǎo)入工程

導(dǎo)入后結(jié)構(gòu)如圖

工程整體結(jié)構(gòu).png

二、統(tǒng)一依賴(lài)管理

打開(kāi)最外層的build.gradle
配置統(tǒng)一依賴(lài)，加入

ext{
    compileSdkVersion = 25
    buildToolsVersion = "25.0.1"  
    minSdkVersion = 24
    targetSdkVersion = 25
    versionCode = 1
    // compile support libs
    libs_support_v4="com.android.support:support-v4:25.0.1"
    libs_support_v13="com.android.support:support-v13:25.0.1"  
    libs_preference_v14="com.android.support:preference-v14:25.0.1"  
    libs_appcompat_v7="com.android.support:appcompat-v7:25.0.1"  
    libs_recyclerview_v7="com.android.support:recyclerview-v7:25.0.1"  
    libs_preference_v7="com.android.support:preference-v7:25.0.1"  
    // provided support lib
    lib_jar_bouncycastle="../lib/bouncycastle.jar"  
    lib_jar_core="../lib/core.jar"
    lib_jar_core_oj="../lib/core-oj.jar"
    lib_jar_framework="../lib/framework.jar"
    lib_jar_ims_common="../lib/ims-common.jar"
    lib_jar_telephony_common="../lib/telephony-common.jar"
}

由于調(diào)用自己的framework，所以加載自己的framework.jar
在最外層build.gradle中引入

allprojects {
    repositories {
        jcenter()
    }
    gradle.projectsEvaluated {
        tasks.withType(JavaCompile){
            options.compilerArgs.add('-Xbootclasspath/p:lib/framework.jar')
        }
    }
}

framework.jar路徑視具體情況配置。
開(kāi)發(fā)時(shí)，不希望有引用到framework.jar的方法報(bào)紅，引入以下方法暫時(shí)將自己的framework.jar優(yōu)先級(jí)提高

def pushDownSDK(iml){
    def imlFile = file(iml)
    try {
        def parsedXml = (new XmlParser()).parse(imlFile)
        def jdkIndexOf =  
        parsedXml.component[1].orderEntry.findIndexOf {it.'@type' == 'jdk'}  
        if ( jdkIndexOf <= 1) {
        def jdkNode =   
        parsedXml.component[1].orderEntry.find { it.'@type' == 'jdk' }  
        parsedXml.component[1].remove(jdkNode)
        def API = "Android API " + ext.targetSdkVersion + " Platform"
        new Node(parsedXml.component[1],  
                        'orderEntry',  
                        ['type': 'jdk', 'jdkName': API, 'jdkType': 'Android SDK'])
        def writer = new StringWriter()
        new XmlNodePrinter(new PrintWriter(writer)).print(parsedXml)
        imlFile.text = writer.toString()
        println "Push File: $iml jdk priority ok"
        }
    } catch (Exception e) {
         // do nothing
    }
}

以上方法的調(diào)用是在Gradle構(gòu)建完成之后調(diào)用的，于是加入

gradle.buildFinished {  
    pushDownSDK("settings/settings.iml");  
}

子工程就是普通的配置了，這里僅僅貼一下，如下，moudle settings下的build.gradle

import java.text.SimpleDateFormat  

apply plugin: 'com.android.application'  
apply plugin: 'me.tatarka.retrolambda'  
  
def apkName = "Settings.apk"  
def baseVersion = "2.001"   
 
def buildTime(){  
    def df = new SimpleDateFormat("yyMMddHHmm")  
    return df.format(new Date())
}  
  
android {  
    compileSdkVersion rootProject.ext.compileSdkVersion   
    buildToolsVersion rootProject.ext.buildToolsVersion  
    defaultConfig {  
        applicationId "com.android.settings"   
        minSdkVersion rootProject.ext.minSdkVersion  
        targetSdkVersion rootProject.ext.targetSdkVersion  
        versionCode rootProject.ext.versionCode  
        versionName "${baseVersion}.${buildTime()}"
    }  
    compileOptions{  
        sourceCompatibility JavaVersion.VERSION_1_8  
        targetCompatibility JavaVersion.VERSION_1_8
    }  
    buildTypes {  
        release {  
            minifyEnabled false  
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'   
        }
    }  
    lintOptions {  
        abortOnError false 
    }  
    android.applicationVariants.all { variant ->  
        variant.outputs.each { output ->  
        def outputFile = output.outputFile  
        if (outputFile != null && outputFile.name.endsWith('.apk')) {  
                output.outputFile = new File(outputFile.parent, apkName)
            }  
        }
    }
}
  
repositories {  
    flatDir {  
        dirs 'aar'  
    }
}  

dependencies {  
    compile fileTree(include: ['*.jar'], dir: 'libs')   
    compile(name: 'settingslib', ext: 'aar')     
    compile(name: 'setupwizardlib', ext: 'aar')    
    provided files(rootProject.ext.lib_jar_bouncycastle)   
    provided files(rootProject.ext.lib_jar_core)    
    provided files(rootProject.ext.lib_jar_core_oj)   
    provided files(rootProject.ext.lib_jar_framework)    
    provided files(rootProject.ext.lib_jar_ims_common)     
    provided files(rootProject.ext.lib_jar_telephony_common)   
    compile rootProject.ext.libs_support_v4   
    compile rootProject.ext.libs_support_v13   
    compile rootProject.ext.libs_preference_v14   
    compile rootProject.ext.libs_appcompat_v7   
    compile rootProject.ext.libs_recyclerview_v7   
    compile rootProject.ext.libs_preference_v7  
}

三、編寫(xiě)簡(jiǎn)單的lint.xml

由于是系統(tǒng)級(jí)應(yīng)用，某些lint檢查是可以忽略或者降低檢查的嚴(yán)格性，自己根據(jù)需求定義lint規(guī)則，在主moudle下新建lint.xml文件，內(nèi)容如下：

<?xml version="1.0" encoding="utf-8"?>  
<lint>  
    <issue id="MissingTranslation" severity="ignore"/>  
    <issue id="LongLogTag" severity="warning"/>  
    <issue id="ProtectedPermissions" severity="warning"/>  
</lint>

以上改變了原有的規(guī)則檢查，其中
MissingTranslation是對(duì)語(yǔ)言翻譯的檢查，多國(guó)語(yǔ)言對(duì)于我來(lái)說(shuō)實(shí)在不是必須的，反正到時(shí)候有需求的時(shí)候再導(dǎo)入即可，于是直接降級(jí)為忽略ignore了；
LongLogTag是在打印log的時(shí)候log長(zhǎng)度不宜過(guò)長(zhǎng)，目前處于調(diào)試階段，對(duì)于這種規(guī)則檢查也是可以忽略的，但還是暫且降級(jí)為警告吧warning，以便后續(xù)處理；
ProtectedPermissions是指在AndroidManifest.xml定義權(quán)限時(shí)，定義了系統(tǒng)級(jí)別的權(quán)限，不過(guò)既然是開(kāi)發(fā)系統(tǒng)級(jí)應(yīng)用，好吧，為了好看，那就降級(jí)為警告warning就行。

好，至此，已經(jīng)可以使用Android Studio來(lái)進(jìn)行Android系統(tǒng)級(jí)應(yīng)用開(kāi)發(fā)了，快來(lái)愉快的學(xué)習(xí)開(kāi)發(fā)系統(tǒng)應(yīng)用吧。
女神鎮(zhèn)樓

日向雛田.jpg