文章目錄
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- 問題
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- 1.動态代理使用Kotlin書寫報錯
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- 描述
- 思考
- 解決
問題
1.動态代理使用Kotlin書寫報錯
描述
Process: com.y.hookdemo, PID: 24014
java.lang.IllegalArgumentException: method android.app.IActivityManager$Stub$Proxy.getActivityDisplayId argument 1 has type android.os.IBinder, got java.lang.Object[]
at java.lang.reflect.Method.invoke(Native Method)
at com.y.hookdemo.HookUtil$HookInvocationHandler.invoke(HookUtil.kt:121)
- kotlin書寫:
private class HookInvocationHandler(private val iam: Any): InvocationHandler {
@Throws(Throwable::class)
override fun invoke(proxy: Any, method: Method, args: Array<Any>): Any {
if (method.name.contains("startActivity")) {
Log.e("Hook", "IActivityManager動态代理的invoke方法,僞裝intent")
for (i in args.indices) {
if (args[i] is Intent) {
val intent = args[i] as Intent
val proxyIntent = Intent(mContext, ProxyActivity::class.java)
proxyIntent.putExtra("intent", intent)
args[i] = proxyIntent
break
}
}
}
return method.invoke(iam, args)
}
}
報錯在 return method.invoke(iam, args) 這一行,用java寫正常執行
- java書寫:
private class HookInvocationHandler implements InvocationHandler {
private Object iam;
private HookInvocationHandler(Object iam) {
this.iam = iam;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getName().contains("startActivity")) {
Log.e("Hook", "IActivityManager動态代理的invoke方法,僞裝intent");
for (int i = 0; i < args.length; i++) {
if (args[i] instanceof Intent) {
Intent intent = (Intent) args[i];
Intent proxyIntent = new Intent(mContext, ProxyActivity.class);
proxyIntent.putExtra("intent", intent);
args[i] = proxyIntent;
break;
}
}
}
return method.invoke(iam, args);
}
}
将java通過as轉為kotlin,這行變為
return method.invoke(iam, *args)
第二個參數變為*args,依舊報錯
com.y.hookdemo E/AndroidRuntime: Error reporting crash
java.lang.IllegalStateException: method.invoke(iam, *args) must not be null
at com.y.hookdemo.HookUtil$HookInvocationHandler.invoke(HookUtil.kt:121)
at java.lang.reflect.Proxy.invoke(Proxy.java:913)
思考
@CallerSensitive
// Android-changed: invoke(Object, Object...) implemented natively.
@FastNative
public native Object invoke(Object obj, Object... args)
throws IllegalAccessException, IllegalArgumentException, InvocationTargetException;
反射api中Method的invoke方法接收可變長參數,在java中允許數組指派給可變長參數Object… args,Kotlin中,數組是array,可變長參數類型是vararg,類型不一緻,是以
method.invoke(iam, args)
,是兩個參數,第二個參數是數組,實際方法需要多個參數,第二個參數是IBinder,是以報第一個錯。
Kotlin中數組轉為可變長參數,是通過前面加*,是以as把java轉為kotlin後,變為
method.invoke(iam, *args)
,參數正确,但依舊報第二個錯.
???
解決
解決毛,谷歌吹個毛的java和kotlin可以一起用,改用java寫了
kotlin書寫時,傳回值是Any,方法可能是沒有傳回值的,是以修改為Any?,然後修改
private class HookInvocationHandler(private val iam: Any): InvocationHandler {
@Throws(Throwable::class)
override fun invoke(proxy: Any, method: Method, args: Array<Any>): Any? {
if (method.name.contains("startActivity")) {
Log.e("Hook", "IActivityManager動态代理的invoke方法,僞裝intent")
for (i in args.indices) {
if (args[i] is Intent) {
val intent = args[i] as Intent
val proxyIntent = Intent(mContext, ProxyActivity::class.java)
proxyIntent.putExtra("intent", intent)
args[i] = proxyIntent
break
}
}
}
val res = method.invoke(iam, *args)
Log.e("------a1:${method.name}",args.size.toString())
Log.e("res = ",res?.toString() + "--")
Log.e("returnType:",method.genericReturnType.typeName)
return if("void" == method.genericReturnType.typeName) Unit else res
}
}
正常運作
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新的問題
java書寫時傳回值為Object,執行沒有傳回值的method時,為什麼可以