昨天看了一段android配置aspectj实现AOP的直播视频，就试着自己配置了一下，可能是因为我自己的AndroidStudio环境的问题，碰到了不少的坑（其实还是因为对gradle理解的不多），但总归是配置好了，就分享一下。

试了两种方式，不过项目下的build.gradle，没什么变化，直接看一下代码吧：
build.gradle(项目下)

buildscript {
    ext {
        //android appcompat支持库版本
        androidSupportVersion = '26.1.0'
        //编译的 SDK 版本，如API20
        compileSdkVersion = 26
        //构建工具的版本，其中包括了打包工具aapt、dx等,如API20对应的build-tool的版本就是20.0.0
        buildToolsVersion = "26.0.2"
        //兼容的最低 SDK 版本
        minSdkVersion = 15
        //向前兼容，保存新旧两种逻辑，并通过 if-else 方法来判断执行哪种逻辑
        targetSdkVersion = 26
        //kotlin版本号
        kotlin_version = '1.2.10'

        kotlinVersion = "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
        appcompatV7 = "com.android.support:appcompat-v7:$androidSupportVersion"
        appcompatDesign = "com.android.support:design:$androidSupportVersion"
        constraintLayout = 'com.android.support.constraint:constraint-layout:1.0.2'
    }
    repositories {
        google()
        jcenter()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'org.greenrobot:greendao-gradle-plugin:3.2.1'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
        classpath 'org.aspectj:aspectjtools:1.8.13'
        classpath 'org.aspectj:aspectjweaver:1.8.13'
    }

}

allprojects {
    repositories {
        google()
        jcenter()
        mavenCentral()
    }
}

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

看着一大堆，主要就是下面这几行配置，其他的是我自己项目中用到的，根据自己需要配置就行。

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'org.aspectj:aspectjtools:1.8.13'
        classpath 'org.aspectj:aspectjweaver:1.8.13'
    }
}

repositories {
    mavenCentral()
}

其实这几行配置在app的build.gradle里也是可以的，但是因为项目下的build.gradle里已经有buildscript {}、allprojects {repositories{} }，就配置在这里了。

然后有两种配置方式：

第一种
只有一个主Module app的情况下，配置app的build.gradle：

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

apply plugin: 'org.greenrobot.greendao'

android {
    compileSdkVersion rootProject.ext.compileSdkVersion
    buildToolsVersion rootProject.ext.buildToolsVersion
    defaultConfig {
        applicationId "填入自己的applicationId"
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        versionCode 1
        versionName "1.0"
        //Lambda配置
//        jackOptions.enabled = true
//        android.compileOptions.sourceCompatibility 1.8
        buildConfigField "boolean", "LOG", "true"// 显示Log
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        //支持矢量图
        vectorDrawables.useSupportLibrary = true
        ndk {
            //选择要添加的对应cpu类型的.so库。
            abiFilters 'armeabi', 'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64', 'mips', 'mips64'
        }
    }

    buildTypes {
        release {
            minifyEnabled false
            buildConfigField "boolean", "LOG", "false"// 显示Log
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }


    }

    //Lambda配置
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    dataBinding {
        enabled true
    }

    greendao {
        schemaVersion 1//数据库版本号
        daoPackage 'com.test.qby.newtestapplication.greendao'//设置DaoMaster、DaoSession、Dao包名
        targetGenDir 'src/main/java'//设置DaoMaster、DaoSession、Dao目录
        //targetGenDirTest：设置生成单元测试目录
        //generateTests：设置自动生成单元测试用例
    }

    lintOptions {
        abortOnError true
    }

}


dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation rootProject.ext.kotlinVersion
    implementation rootProject.ext.appcompatV7
    implementation rootProject.ext.constraintLayout
    compile rootProject.ext.appcompatDesign
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
    compile 'jp.wasabeef:glide-transformations:3.0.1'
    // If you want to use the GPU Filters
    compile 'jp.co.cyberagent.android.gpuimage:gpuimage-library:1.4.1'
    //腾讯bugly
    compile 'com.tencent.bugly:crashreport:latest.release'
    compile 'com.tencent.bugly:nativecrashreport:latest.release'
    //retrofit
    compile 'com.squareup.retrofit2:retrofit:2.3.0'
    compile 'com.squareup.retrofit2:converter-gson:2.3.0'
    compile 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
    compile 'com.squareup.okhttp3:logging-interceptor:3.9.0'
    //rxJava
    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
    // Because RxAndroid releases are few and far between, it is recommended you also
    // explicitly depend on RxJava's latest version for bug fixes and new features.
    compile 'io.reactivex.rxjava2:rxjava:2.1.8'
    //greenDao
    compile 'org.greenrobot:greendao:3.2.0'
    //换肤功能
    compile 'com.zhy:changeskin:4.0.2'
    //AOP面向切面编程，加入这行就不用在libs下引入jar包了，不然要写成compile file(libs/aspectjrt.jar)
    compile 'org.aspectj:aspectjrt:1.8.13'
}
/*
//在项目下配置了，此处就不需要了
buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'org.aspectj:aspectjtools:1.8.13'
        classpath 'org.aspectj:aspectjweaver:1.8.13'
    }
}

repositories {
    mavenCentral()
}
*/

import org.aspectj.bridge.IMessage
import org.aspectj.bridge.MessageHandler
import org.aspectj.tools.ajc.Main

final def log = project.logger
final def variants = project.android.applicationVariants

variants.all { variant ->
    if (!variant.buildType.isDebuggable()) {
        log.debug("Skipping non-debuggable build type '${variant.buildType.name}'.")
        return
    }

    JavaCompile javaCompile = variant.javaCompile
    javaCompile.doLast {
        String[] args = ["-showWeaveInfo",
                         "-1.5",
                         "-inpath", javaCompile.destinationDir.toString(),
                         "-aspectpath", javaCompile.classpath.asPath,
                         "-d", javaCompile.destinationDir.toString(),
                         "-classpath", javaCompile.classpath.asPath,
                         "-bootclasspath", project.android.bootClasspath.join(File.pathSeparator)]
        log.debug "ajc args: " + Arrays.toString(args)

        MessageHandler handler = new MessageHandler(true)
        new Main().run(args, handler)
        for (IMessage message : handler.getMessages(null, true)) {
            switch (message.getKind()) {
                case IMessage.ABORT:
                case IMessage.ERROR:
                case IMessage.FAIL:
                    log.error message.message, message.thrown
                    break
                case IMessage.WARNING:
                    log.warn message.message, message.thrown
                    break
                case IMessage.INFO:
                    log.info message.message, message.thrown
                    break
                case IMessage.DEBUG:
                    log.debug message.message, message.thrown
                    break
            }
        }
    }
}

这一个gradle主要的东西就是这些：

//AOP面向切面编程，加入这行就不用在libs下引入jar包了，不然要写成compile file(libs/aspectjrt.jar)
compile 'org.aspectj:aspectjrt:1.8.13'

import org.aspectj.bridge.IMessage
import org.aspectj.bridge.MessageHandler
import org.aspectj.tools.ajc.Main

final def log = project.logger
final def variants = project.android.applicationVariants

variants.all { variant ->
    if (!variant.buildType.isDebuggable()) {
        log.debug("Skipping non-debuggable build type '${variant.buildType.name}'.")
        return
    }

    JavaCompile javaCompile = variant.javaCompile
    javaCompile.doLast {
        String[] args = ["-showWeaveInfo",
                         "-1.5",
                         "-inpath", javaCompile.destinationDir.toString(),
                         "-aspectpath", javaCompile.classpath.asPath,
                         "-d", javaCompile.destinationDir.toString(),
                         "-classpath", javaCompile.classpath.asPath,
                         "-bootclasspath", project.android.bootClasspath.join(File.pathSeparator)]
        log.debug "ajc args: " + Arrays.toString(args)

        MessageHandler handler = new MessageHandler(true)
        new Main().run(args, handler)
        for (IMessage message : handler.getMessages(null, true)) {
            switch (message.getKind()) {
                case IMessage.ABORT:
                case IMessage.ERROR:
                case IMessage.FAIL:
                    log.error message.message, message.thrown
                    break
                case IMessage.WARNING:
                    log.warn message.message, message.thrown
                    break
                case IMessage.INFO:
                    log.info message.message, message.thrown
                    break
                case IMessage.DEBUG:
                    log.debug message.message, message.thrown
                    break
            }
        }
    }
}

下面那一堆是用命令在编译最后做一些关联的，具体的我也不懂，只管加上好了。

第二种
有多个module都需要用到aspectj，特别是组件开发的情况下，不可能每个module都配置一下，所以就需要新建一个aspectj的module作为项目的library。
app下build.gradle需要修改：
将

//AOP面向切面编程，加入这行就不用在libs下引入jar包了，不然要写成compile file(libs/aspectjrt.jar)
compile 'org.aspectj:aspectjrt:1.8.13'

去掉，改为

implementation project(':aspectjlib')

不过上面这句在你添加module依赖的时候会自动生成。

新建library的build.gradle配置如下：

apply plugin: 'com.android.library'

android {
    compileSdkVersion rootProject.ext.compileSdkVersion
    buildToolsVersion rootProject.ext.buildToolsVersion
    defaultConfig {
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation rootProject.ext.appcompatV7
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
    //AOP
    compile 'org.aspectj:aspectjrt:1.8.13'
}

import org.aspectj.bridge.IMessage
import org.aspectj.bridge.MessageHandler
import org.aspectj.tools.ajc.Main

android.libraryVariants.all { variant ->
    JavaCompile javaCompile = variant.javaCompile
    javaCompile.doLast {
        String[] args = ["-showWeaveInfo",
                         "-1.5",
                         "-inpath", javaCompile.destinationDir.toString(),
                         "-aspectpath", javaCompile.classpath.asPath,
                         "-d", javaCompile.destinationDir.toString(),
                         "-classpath", javaCompile.classpath.asPath,
                         "-bootclasspath", android.bootClasspath.join(
                File.pathSeparator)]

        MessageHandler handler = new MessageHandler(true)
        new Main().run(args, handler)

        def log = project.logger
        for (IMessage message : handler.getMessages(null, true)) {
            switch (message.getKind()) {
                case IMessage.ABORT:
                case IMessage.ERROR:
                case IMessage.FAIL:
                    log.error message.message, message.thrown
                    break
                case IMessage.WARNING:
                case IMessage.INFO:
                    log.info message.message, message.thrown
                    break
                case IMessage.DEBUG:
                    log.debug message.message, message.thrown
                    break
            }
        }
    }
}

注意：下面那一堆跟app的gradle中的稍微有点区别，一个是module,一个是library，gradle中的东西不一样。

两种配置方式基本就是这样了，使用方法我也是刚了解一点，记录一下简单的计算性能的用法吧
自定义注解类：

package com.test.qby.aspectjlib.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Created by qby on 2018/1/26 0026.
 * 自定义注解
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface IFirstAnnotation {
    String value();
}

@Target 注解目标，表示注解使用在什么地方，这里是METHOD方法；@Retention 保留策略，表示注解调用时机，这里RUNTIME运行时

切面类

import android.widget.Toast;

import com.test.qby.aspectjlib.annotation.IFirstAnnotation;
import com.test.qby.newtestapplication.app.MyApplication;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;

import java.lang.reflect.Method;
import java.lang.reflect.TypeVariable;
import java.util.Locale;

/**
 * Created by qby on 2018/1/26 0026.
 * 自定义注解行为
 */
@Aspect
public class MethodBehaviorAspect {
    private static final String TAG = "aspect_aby";

    @Pointcut("execution(@com.test.qby.aspectjlib.annotation.IFirstAnnotation * *(..))")
    public void firstMethodAnnotationBehavior() {
    }

    @Pointcut("execution(* com.test.qby.newtestapplication.ui.MainActivity.aspectClick(android.view.View))")
    public void secondMethodAnnotationBehavior() {
    }

    @Around("firstMethodAnnotationBehavior()")
    public Object wavePointcutAround(ProceedingJoinPoint joinPoint) throws Throwable {

        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
        // 类名
        String className = methodSignature.getDeclaringType().getSimpleName();
        // 方法名
        String methodName = methodSignature.getName();
        // 功能名
        IFirstAnnotation behaviorTrace = methodSignature.getMethod()
                .getAnnotation(IFirstAnnotation.class);
        String value = behaviorTrace.value();
//        String value = "点击";
        long start = System.currentTimeMillis();
        Object result = joinPoint.proceed();
        long duration = System.currentTimeMillis() - start;
        Log.e(TAG, String.format("%s类中%s方法执行%s功能,耗时：%dms", className, methodName, value, duration));
        Toast.makeText(MyApplication.getContext(), String.format(Locale.CHINESE, "%s类中%s方法执行%s功能,耗时：%dms", className, methodName, value, duration), Toast.LENGTH_SHORT).show();
        return result;
    }
}

@Aspect指定切面类；@Pointcut切入点；@Around是切入方式Advice的一种，表示在切入点前后插入代码，还有@Before、@After；Pointcut语法，execution，表示根据Advice在执行方法内部代码前后插入代码,call，表示根据Advice在调用方法前后插入代码……

页面调用

@IFirstAnnotation("测试Aspect")
public void aspectClick(View view) {
     try {
         Thread.sleep(new Random().nextInt(1000));
     } catch (InterruptedException e) {
         e.printStackTrace();
     }
 }

@IFirstAnnotation调用注解，()内部为在IFirstAnnotation中写的value的值，去掉value()后此处去掉()
注意：在MethodBehaviorAspect 类中如果有用到Context，可直接使用joinPoint.getTarget()类型转换成Context，这里是由于项目使用了databinding，部分getTarget()获取到的值不能强转为Context，所以这里用的MyApplication获取的Context

这只是个人的初步尝试，里面当然还有很多内容需要去学，刚看了CSDN上有人写的几篇关于AOP的内容，都挺详细的，给出其中一个地址，自己看吧：http://blog.csdn.net/xwh_1230/article/details/78225258