定義：指無須工程師寫代碼或者寫少量代碼就可預(yù)先自動收集用戶行為數(shù)據(jù)。

適用場景：一些通用的與業(yè)務(wù)關(guān)系不太大的場景。本文拿OnclickListener 舉例子。其他需求比如收集頁面狀態(tài)、停留時間、方法執(zhí)行時間等通用場景也可以適用下面部分方案。

大方向：動態(tài)代理和靜態(tài)代理

動態(tài)代理：在代碼運行過程中進(jìn)行處理（動態(tài)設(shè)置各種回調(diào)事件等）
靜態(tài)代理：在代碼編譯過程中進(jìn)行處理（AspectJ /ASM/Javassist/Ast）

動態(tài)代理

各種方案基本都是通過在Application.registerActivityLifecycleCallbacks()
方案1：代理View.OnclickListener 拿到DecorView 進(jìn)行遍歷有設(shè)置OnclikListener的View 用我們的ClickListener包裝一次
關(guān)鍵代碼片段如下：

class WrapOnclickListener : View.OnClickListener {
    private var originClickListener: View.OnClickListener? = null

    constructor(originClickListener: View.OnClickListener?) {
        this.originClickListener = originClickListener
    }

    override fun onClick(v: View?) {
        try {
            originClickListener?.onClick(v)
            if (v != null) {
                TrackApi.track(v)
            }
        } catch (e: Exception) {
            e.printStackTrace()
        }

    }
}

 private fun getOnclickListener(view: View): View.OnClickListener? {
        val hasOnClickListeners = view.hasOnClickListeners()
        if (hasOnClickListeners) {
            try {
                val viewClass = Class.forName("android.view.View")
                val declaredMethod = viewClass.getDeclaredMethod("getListenerInfo")
                declaredMethod.isAccessible = true
                val listenerInfo = declaredMethod.invoke(view)
                val onClickFiled = Class.forName("android.view.View\$ListenerInfo")
                    .getDeclaredField("mOnClickListener")
                onClickFiled.isAccessible = true
                return onClickFiled.get(listenerInfo) as View.OnClickListener
            } catch (e: Exception) {
                e.printStackTrace()
            }

        }
        return null
    }

缺點：對于后續(xù)才設(shè)置的點擊事件。彈窗等無法跟進(jìn)

方案2：代理Window.Callback
在dispatchTouchEvent中處理點擊view

    var downView:View?=null
    override fun dispatchTouchEvent(event: MotionEvent?): Boolean {
        Log.d(TAG, "dispatchTouchEvent() called with: event = $event")

        val decorView = activity!!.window.decorView
        if (event?.action == MotionEvent.ACTION_DOWN) {
//    找到按下View
            downView= getTargetView(decorView,event)?.last()
        }
        if (downView!=null&&event?.action == MotionEvent.ACTION_UP) {
//    查看松手的View
            val targetView = getTargetView(decorView,event)?.last()
            if (targetView!=null&&targetView==downView) {
                TrackApi.track(downView!!)
            }
        }
        return originCallback?.dispatchTouchEvent(event) == true
    }

方案3:代理View.AccessibilityDelegate 和方案一類似。
反射獲取View的 mAccessibilityDelegate

    fun getViewAccessibility(view: View): AccessibilityDelegate? {
        var delegate: View.AccessibilityDelegate? = null

        try {
            val kClass: Class<*> = view.javaClass
            val method = kClass.getMethod("getAccessibilityDelegate")
            delegate = method.invoke(view) as View.AccessibilityDelegate
        } catch (e: Exception) {
            e.printStackTrace()
        }

        if (delegate == null || delegate !is MyClickDelegate) {
            view.setAccessibilityDelegate(MyClickDelegate(delegate))
        }
        return null
    }

class MyClickDelegate : View.AccessibilityDelegate {
    var realAccessibilityDelegate: View.AccessibilityDelegate? = null

    constructor(realAccessibilityDelegate: View.AccessibilityDelegate?) : this() {
        this.realAccessibilityDelegate = realAccessibilityDelegate
    }

    constructor()

    override fun sendAccessibilityEvent(host: View, eventType: Int) {
        super.sendAccessibilityEvent(host, eventType)
        realAccessibilityDelegate?.sendAccessibilityEvent(host, eventType)
        TrackApi.track(host)
    }
}

方案4：添加透明層處理onTouchEvent

   private fun addAlphaFramlayout(activity: Activity,decorView: ViewGroup) {
        val alphaFrameLayout = AlphaFrameLayout(activity)
        decorView.addView(alphaFrameLayout, ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT))
        ViewCompat.setElevation(alphaFrameLayout,999f)
    }

靜態(tài)代理

通過gradle 在編譯期間動態(tài)插入或者修改代碼

微信圖片_20231124095559.jpg

方案5：AspectJ AOP

val variants = project.android.applicationVariants
variants.all {
    println("ajc args variants: ${this.toString()} javaCompileProvider=${javaCompileProvider.get()}")
    javaCompileProvider.get().doLast {
        val args = arrayOf(
            "-showWeaveInfo",
            "-1.7",
            "-inpath", javaCompile.destinationDir.toString(),
            "-aspectpath", javaCompile.classpath.asPath,
            "-d", javaCompile.destinationDir.toString(),
            "-classpath", javaCompile.classpath.asPath,
            "-bootclasspath", project.android.bootClasspath.joinToString(File.pathSeparator)
        )
        println("ajc args: ${args.contentToString()}")
        val messageHandler = MessageHandler(true)
        Main().run(args, messageHandler)
    }
}

比如寫一個統(tǒng)計所有方法執(zhí)行時間的

@Aspect
public class TrackUtils {
    private static final String TAG = "TrackUtils";

    @Around("execution(* *(..))")
    public Object checkAllMethod(ProceedingJoinPoint joinPoint) throws Throwable {
        long startTime = System.nanoTime();
        Object proceed = joinPoint.proceed();
        long endTime = System.nanoTime();
        Signature signature = joinPoint.getSignature();
        MethodSignature methodSignature = (MethodSignature) signature;
        Method method = methodSignature.getMethod();
        Log.d(TAG, "checkAllMethod() called with: joinPoint = " + joinPoint + " startTime=" + startTime + " endTime=" + endTime + " 執(zhí)行時間=" + (endTime - startTime) + " signature=" + signature + " method=" + method + "");
        return proceed;
    }
}

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initView();
    }

    private void initView() {
    }

處理后

  protected void onCreate(@Nullable Bundle savedInstanceState) {
        JoinPoint var3 = Factory.makeJP(ajc$tjp_0, this, this, savedInstanceState);
        onCreate_aroundBody1$advice(this, savedInstanceState, var3, TrackUtils.aspectOf(), (ProceedingJoinPoint)var3);
    }

    private void initView() {
        JoinPoint var1 = Factory.makeJP(ajc$tjp_1, this, this);
        initView_aroundBody3$advice(this, var1, TrackUtils.aspectOf(), (ProceedingJoinPoint)var1);
    }

    static {
        ajc$preClinit();
    }

更多匹配規(guī)則可以參考 https://blog.csdn.net/u013651026/article/details/130764336
缺點：只能處理我們自己代碼編譯的產(chǎn)物，無法織入第三方庫
不支持lambda語法，kotlin

AspectJX可以支持三方庫(不維護了)

方案6：ASM插樁
Transform API 在gradle8 已經(jīng)棄用

val androidComponentsExtension = target.extensions.getByType(
            AndroidComponentsExtension::class.java
        )
        androidComponentsExtension.onVariants { variant ->
            variant.transformClassesWith(TimeCostTransform::class.java, InstrumentationScope.ALL) {
            }

        }
//        agp 8.0 之前的版本 實現(xiàn)transform
//        val appExtension = target.extensions.getByType(AppExtension::class.java)
//        appExtension.registerTransform(ASMAOPTransform())

               private var startTimeLocal = -1 // 保存 startTime 的局部變量索引
                override fun onMethodEnter() {
                    super.onMethodEnter()
                    println("onMethodEnter access=$access name=$name descriptor=$descriptor signature=$signature exceptions=$exceptions")
                    // 在onMethodEnter中插入代碼 val startTime = System.currentTimeMillis()
                    mv.visitMethodInsn(
                        Opcodes.INVOKESTATIC,
                        "java/lang/System",
                        "currentTimeMillis",
                        "()J",
                        false
                    )
                    startTimeLocal = newLocal(Type.LONG_TYPE) // 創(chuàng)建一個新的局部變量來保存 startTime
                    mv.visitVarInsn(Opcodes.LSTORE, startTimeLocal)
                }

 override fun onMethodExit(opcode: Int) {
                    // 在onMethodExit中插入代碼 Log.e("tag", "Method: $name, timecost: " + (System.currentTimeMillis() - startTime))
                    mv.visitTypeInsn(
                        Opcodes.NEW,
                        "java/lang/StringBuilder"
                    );
                    mv.visitInsn(Opcodes.DUP);
                    mv.visitLdcInsn("PluginThread: $pluginExecuteThreadName Method: $name, methodTime: ");
                    mv.visitMethodInsn(
                        Opcodes.INVOKESPECIAL,
                        "java/lang/StringBuilder",
                        "<init>",
                        "(Ljava/lang/String;)V",
                        false
                    );
                    mv.visitMethodInsn(
                        Opcodes.INVOKESTATIC,
                        "java/lang/System",
                        "currentTimeMillis",
                        "()J",
                        false
                    );
                    mv.visitVarInsn(Opcodes.LLOAD, startTimeLocal);
                    mv.visitInsn(Opcodes.LSUB);
                    mv.visitMethodInsn(
                        Opcodes.INVOKEVIRTUAL,
                        "java/lang/StringBuilder",
                        "append",
                        "(J)Ljava/lang/StringBuilder;",
                        false
                    );
                    mv.visitMethodInsn(
                        Opcodes.INVOKEVIRTUAL,
                        "java/lang/StringBuilder",
                        "toString",
                        "()Ljava/lang/String;",
                        false
                    );
                    mv.visitLdcInsn("TimeCostClassVisitor")
                    mv.visitInsn(Opcodes.SWAP)
                    mv.visitMethodInsn(
                        Opcodes.INVOKESTATIC,
                        "android/util/Log",
                        "e",
                        "(Ljava/lang/String;Ljava/lang/String;)I",
                        false
                    )
                    mv.visitInsn(POP)
                    super.onMethodExit(opcode)
                    println("opcode = [${opcode}]")
                    println("onMethodExit access=$access name=$name descriptor=$descriptor signature=$signature exceptions=$exceptions")

                }