Android(安卓)引入AspectJ的记录

Android 引入 AspectJ进行AOP开发的记录。

在不试用插件时，引入AspectJ到android工程

1. 在项目gradle引入插件：

    dependencies {        ...        classpath 'org.aspectj:aspectjtools:1.9.5'        ...    }

2. 在创建aspect文件的包引入

dependencies {    ...    implementation 'org.aspectj:aspectjrt:1.9.5'    ...}

并在同gradle文件中，加入

import org.aspectj.bridge.IMessageimport org.aspectj.bridge.MessageHandlerimport org.aspectj.tools.ajc.Mainfinal def log = project.loggerfinal def variants = project.android.applicationVariantsvariants.all { variant ->    JavaCompile javaCompile    if (variant.hasProperty('javaCompileProvider')) {        //android gradle 3.3.0 +        javaCompile = variant.javaCompileProvider.get()    } else {        javaCompile = variant.javaCompile    }    def buildType = variant.buildType.name    javaCompile.doLast {        MessageHandler handler = new MessageHandler(true)        String[] javaArgs = [                "-showWeaveInfo",                "-1.8",                "-inpath", javaCompile.destinationDir.toString(),                "-aspectpath", javaCompile.classpath.asPath,                "-d", javaCompile.destinationDir.toString(),                "-classpath", javaCompile.classpath.asPath,                "-bootclasspath", project.android.bootClasspath.join(File.pathSeparator)        ]        new Main().run(javaArgs, handler)        String[] kotlinArgs = [                "-showWeaveInfo",                "-1.8",                "-inpath", project.buildDir.path + "/tmp/kotlin-classes/" + buildType,                "-aspectpath", javaCompile.classpath.asPath,                "-d", project.buildDir.path + "/tmp/kotlin-classes/" + buildType,                "-classpath", javaCompile.classpath.asPath,                "-bootclasspath", project.android.bootClasspath.join(File.pathSeparator)        ]        new Main().run(kotlinArgs, 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:                case IMessage.INFO:                    log.info message.message, message.thrown                    break                case IMessage.DEBUG:                    log.debug message.message, message.thrown                    break            }        }    }}

这样就成功引入AspectJ工具了，下一步编写Aspect文件。

3. 先实现自己的业务逻辑

package com.example.cheng.test;import android.annotation.SuppressLint;import android.os.Bundle;import android.widget.TextView;import com.example.common.DisplayMetricsUtil;import androidx.annotation.Nullable;import androidx.appcompat.app.AppCompatActivity;public class MainActivityJava extends AppCompatActivity {    @SuppressLint("SetTextI18n")    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        TextView text = findViewById(R.id.text);        text.measure(0, 0);        text.setText("text width: " + DisplayMetricsUtil.px2dp(this, text.getMeasuredWidth()));    }}

4. 再在同module下实现aspect文件

package com.example.cheng.test;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.annotation.After;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Pointcut;@Aspectpublic class MainActivityAspectJava extends BaseAspect {    @Pointcut("execution(* com.example.cheng.test.MainActivityJava.on*(..))")    public void mainPointCut() {    }    @After("mainPointCut()")    public void hookMain(JoinPoint joinPoint) throws Throwable {        log("java::" + joinPoint.getSignature().toLongString());    }    @Pointcut("call(* com.example.common.DisplayMetricsUtil.*(..))")    public void displayPointCut() {    }    @After("displayPointCut()")    public void hookDisplay(JoinPoint joinPoint) throws Throwable {        log("java::" + joinPoint.getSignature().toLongString());    }}

输出效果：

补充记录：

1. 因为kotlin文件编译出的.class文件路径与java不同，所以需要额外为aspect tool指定kotlin的路径。

        String[] kotlinArgs = [                "-showWeaveInfo",                "-1.8",                "-inpath", project.buildDir.path + "/tmp/kotlin-classes/" + buildType,                "-aspectpath", javaCompile.classpath.asPath,                "-d", project.buildDir.path + "/tmp/kotlin-classes/" + buildType,                "-classpath", javaCompile.classpath.asPath,                "-bootclasspath", project.android.bootClasspath.join(File.pathSeparator)        ]        new Main().run(kotlinArgs, handler)

待解决问题：

1. kotlin每次都需要clean build

2. 如何跨module实现aop weave，即在一个包中，可以通过pointcut切入其他module中的方法及其调用。

3. Java写的业务逻辑，kotlin的aspect文件能够对其织入；Kotlin写的业务逻辑，Java的Aspect文件不能对其织入。

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