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/C0221i.java

@@ -0,0 +1,176 @@
+package androidx.recyclerview.widget;
+
+import e3.C0333t;
+import e3.C0334u;
+import kotlin.jvm.internal.Intrinsics;
+import kotlin.text.StringsKt__StringsKt;
+
+/* renamed from: androidx.recyclerview.widget.i, reason: case insensitive filesystem */
+/* loaded from: classes.dex */
+public final class C0221i {
+
+    /* renamed from: a, reason: collision with root package name */
+    public final /* synthetic */ int f3823a;
+
+    /* renamed from: b, reason: collision with root package name */
+    public long f3824b;
+
+    /* renamed from: c, reason: collision with root package name */
+    public Object f3825c;
+
+    public C0221i(d1.i systemWrapper) {
+        this.f3823a = 1;
+        Intrinsics.checkNotNullParameter(systemWrapper, "systemWrapper");
+        this.f3825c = systemWrapper;
+    }
+
+    public void a(int i) {
+        if (i < 64) {
+            this.f3824b &= ~(1 << i);
+            return;
+        }
+        C0221i c0221i = (C0221i) this.f3825c;
+        if (c0221i != null) {
+            c0221i.a(i - 64);
+        }
+    }
+
+    public int b(int i) {
+        C0221i c0221i = (C0221i) this.f3825c;
+        if (c0221i == null) {
+            if (i >= 64) {
+                return Long.bitCount(this.f3824b);
+            }
+            return Long.bitCount(((1 << i) - 1) & this.f3824b);
+        }
+        if (i < 64) {
+            return Long.bitCount(((1 << i) - 1) & this.f3824b);
+        }
+        return Long.bitCount(this.f3824b) + c0221i.b(i - 64);
+    }
+
+    public void c() {
+        if (((C0221i) this.f3825c) == null) {
+            this.f3825c = new C0221i();
+        }
+    }
+
+    public boolean d(int i) {
+        if (i < 64) {
+            return ((1 << i) & this.f3824b) != 0;
+        }
+        c();
+        return ((C0221i) this.f3825c).d(i - 64);
+    }
+
+    public void e(int i, boolean z3) {
+        if (i >= 64) {
+            c();
+            ((C0221i) this.f3825c).e(i - 64, z3);
+            return;
+        }
+        long j4 = this.f3824b;
+        boolean z4 = (Long.MIN_VALUE & j4) != 0;
+        long j5 = (1 << i) - 1;
+        this.f3824b = ((j4 & (~j5)) << 1) | (j4 & j5);
+        if (z3) {
+            i(i);
+        } else {
+            a(i);
+        }
+        if (z4 || ((C0221i) this.f3825c) != null) {
+            c();
+            ((C0221i) this.f3825c).e(0, z4);
+        }
+    }
+
+    public C0334u f() {
+        int indexOf$default;
+        C0333t c0333t = new C0333t();
+        while (true) {
+            String line = ((r3.C) this.f3825c).a0(this.f3824b);
+            this.f3824b -= line.length();
+            if (line.length() == 0) {
+                return c0333t.d();
+            }
+            Intrinsics.checkNotNullParameter(line, "line");
+            indexOf$default = StringsKt__StringsKt.indexOf$default((CharSequence) line, ':', 1, false, 4, (Object) null);
+            if (indexOf$default != -1) {
+                String substring = line.substring(0, indexOf$default);
+                Intrinsics.checkNotNullExpressionValue(substring, "this as java.lang.String…ing(startIndex, endIndex)");
+                String substring2 = line.substring(indexOf$default + 1);
+                Intrinsics.checkNotNullExpressionValue(substring2, "this as java.lang.String).substring(startIndex)");
+                c0333t.b(substring, substring2);
+            } else if (line.charAt(0) == ':') {
+                String substring3 = line.substring(1);
+                Intrinsics.checkNotNullExpressionValue(substring3, "this as java.lang.String).substring(startIndex)");
+                c0333t.b("", substring3);
+            } else {
+                c0333t.b("", line);
+            }
+        }
+    }
+
+    public boolean g(int i) {
+        if (i >= 64) {
+            c();
+            return ((C0221i) this.f3825c).g(i - 64);
+        }
+        long j4 = 1 << i;
+        long j5 = this.f3824b;
+        boolean z3 = (j5 & j4) != 0;
+        long j6 = j5 & (~j4);
+        this.f3824b = j6;
+        long j7 = j4 - 1;
+        this.f3824b = (j6 & j7) | Long.rotateRight((~j7) & j6, 1);
+        C0221i c0221i = (C0221i) this.f3825c;
+        if (c0221i != null) {
+            if (c0221i.d(0)) {
+                i(63);
+            }
+            ((C0221i) this.f3825c).g(0);
+        }
+        return z3;
+    }
+
+    public void h() {
+        this.f3824b = 0L;
+        C0221i c0221i = (C0221i) this.f3825c;
+        if (c0221i != null) {
+            c0221i.h();
+        }
+    }
+
+    public void i(int i) {
+        if (i < 64) {
+            this.f3824b |= 1 << i;
+        } else {
+            c();
+            ((C0221i) this.f3825c).i(i - 64);
+        }
+    }
+
+    public String toString() {
+        switch (this.f3823a) {
+            case 0:
+                if (((C0221i) this.f3825c) == null) {
+                    return Long.toBinaryString(this.f3824b);
+                }
+                return ((C0221i) this.f3825c).toString() + "xx" + Long.toBinaryString(this.f3824b);
+            default:
+                return super.toString();
+        }
+    }
+
+    public C0221i(r3.C source) {
+        this.f3823a = 2;
+        Intrinsics.checkNotNullParameter(source, "source");
+        this.f3825c = source;
+        this.f3824b = 262144L;
+    }
+
+    public C0221i() {
+        this.f3823a = 0;
+        this.f3824b = 0L;
+    }
+}