Primer paso de la investigacion. Se aportan el .apk, las carpetas con el apk extraido y el apk descompilado. El archivo API_DOCUMENTATION.md es un archivo donde se anotaran los descubrimientos del funcionamiento de la API, y los .py son scripts para probar la funcionalidad de la API con los métodos que vayamos encontrando. Finalmente, los archivos .js son scripts de Frida para extraer informacion de la APP durante la ejecucion.

apk_decompiled/sources/androidx/recyclerview/widget/C0223j.java

@@ -0,0 +1,164 @@
+package androidx.recyclerview.widget;
+
+import android.util.Log;
+import android.view.View;
+import android.view.ViewGroup;
+import java.util.ArrayList;
+
+/* renamed from: androidx.recyclerview.widget.j, reason: case insensitive filesystem */
+/* loaded from: classes.dex */
+public final class C0223j {
+
+    /* renamed from: a, reason: collision with root package name */
+    public final C0216f0 f3826a;
+
+    /* renamed from: e, reason: collision with root package name */
+    public View f3830e;
+
+    /* renamed from: d, reason: collision with root package name */
+    public int f3829d = 0;
+
+    /* renamed from: b, reason: collision with root package name */
+    public final C0221i f3827b = new C0221i();
+
+    /* renamed from: c, reason: collision with root package name */
+    public final ArrayList f3828c = new ArrayList();
+
+    public C0223j(C0216f0 c0216f0) {
+        this.f3826a = c0216f0;
+    }
+
+    public final void a(View view, int i, boolean z3) {
+        RecyclerView recyclerView = this.f3826a.f3809a;
+        int childCount = i < 0 ? recyclerView.getChildCount() : f(i);
+        this.f3827b.e(childCount, z3);
+        if (z3) {
+            i(view);
+        }
+        recyclerView.addView(view, childCount);
+        I0 N3 = RecyclerView.N(view);
+        AbstractC0220h0 abstractC0220h0 = recyclerView.f3694m;
+        if (abstractC0220h0 != null && N3 != null) {
+            abstractC0220h0.onViewAttachedToWindow(N3);
+        }
+        ArrayList arrayList = recyclerView.f3652C;
+        if (arrayList != null) {
+            for (int size = arrayList.size() - 1; size >= 0; size--) {
+                ((InterfaceC0241s0) recyclerView.f3652C.get(size)).a(view);
+            }
+        }
+    }
+
+    public final void b(View view, int i, ViewGroup.LayoutParams layoutParams, boolean z3) {
+        RecyclerView recyclerView = this.f3826a.f3809a;
+        int childCount = i < 0 ? recyclerView.getChildCount() : f(i);
+        this.f3827b.e(childCount, z3);
+        if (z3) {
+            i(view);
+        }
+        I0 N3 = RecyclerView.N(view);
+        if (N3 != null) {
+            if (!N3.isTmpDetached() && !N3.shouldIgnore()) {
+                StringBuilder sb = new StringBuilder("Called attach on a child which is not detached: ");
+                sb.append(N3);
+                throw new IllegalArgumentException(C.w.j(recyclerView, sb));
+            }
+            if (RecyclerView.f3642B0) {
+                Log.d("RecyclerView", "reAttach " + N3);
+            }
+            N3.clearTmpDetachFlag();
+        } else if (RecyclerView.A0) {
+            StringBuilder sb2 = new StringBuilder("No ViewHolder found for child: ");
+            sb2.append(view);
+            sb2.append(", index: ");
+            sb2.append(childCount);
+            throw new IllegalArgumentException(C.w.j(recyclerView, sb2));
+        }
+        recyclerView.attachViewToParent(view, childCount, layoutParams);
+    }
+
+    public final void c(int i) {
+        int f2 = f(i);
+        this.f3827b.g(f2);
+        RecyclerView recyclerView = this.f3826a.f3809a;
+        View childAt = recyclerView.getChildAt(f2);
+        if (childAt != null) {
+            I0 N3 = RecyclerView.N(childAt);
+            if (N3 != null) {
+                if (N3.isTmpDetached() && !N3.shouldIgnore()) {
+                    StringBuilder sb = new StringBuilder("called detach on an already detached child ");
+                    sb.append(N3);
+                    throw new IllegalArgumentException(C.w.j(recyclerView, sb));
+                }
+                if (RecyclerView.f3642B0) {
+                    Log.d("RecyclerView", "tmpDetach " + N3);
+                }
+                N3.addFlags(256);
+            }
+        } else if (RecyclerView.A0) {
+            StringBuilder sb2 = new StringBuilder("No view at offset ");
+            sb2.append(f2);
+            throw new IllegalArgumentException(C.w.j(recyclerView, sb2));
+        }
+        recyclerView.detachViewFromParent(f2);
+    }
+
+    public final View d(int i) {
+        return this.f3826a.f3809a.getChildAt(f(i));
+    }
+
+    public final int e() {
+        return this.f3826a.f3809a.getChildCount() - this.f3828c.size();
+    }
+
+    public final int f(int i) {
+        if (i < 0) {
+            return -1;
+        }
+        int childCount = this.f3826a.f3809a.getChildCount();
+        int i4 = i;
+        while (i4 < childCount) {
+            C0221i c0221i = this.f3827b;
+            int b4 = i - (i4 - c0221i.b(i4));
+            if (b4 == 0) {
+                while (c0221i.d(i4)) {
+                    i4++;
+                }
+                return i4;
+            }
+            i4 += b4;
+        }
+        return -1;
+    }
+
+    public final View g(int i) {
+        return this.f3826a.f3809a.getChildAt(i);
+    }
+
+    public final int h() {
+        return this.f3826a.f3809a.getChildCount();
+    }
+
+    public final void i(View view) {
+        this.f3828c.add(view);
+        C0216f0 c0216f0 = this.f3826a;
+        I0 N3 = RecyclerView.N(view);
+        if (N3 != null) {
+            N3.onEnteredHiddenState(c0216f0.f3809a);
+        }
+    }
+
+    public final void j(View view) {
+        if (this.f3828c.remove(view)) {
+            C0216f0 c0216f0 = this.f3826a;
+            I0 N3 = RecyclerView.N(view);
+            if (N3 != null) {
+                N3.onLeftHiddenState(c0216f0.f3809a);
+            }
+        }
+    }
+
+    public final String toString() {
+        return this.f3827b.toString() + ", hidden list:" + this.f3828c.size();
+    }
+}