将消息添加到Smali文件或将Java转换为Smali

Question

Hi I want to add a messsage into this Smali file but I dont understad how its works. I cant convert my Java code to Smali.

I want to show my V2 variable. I Try this: invoke-virtual {v2}, Landroid/widget/Toast;->show()V

But doesnt work... The app crashes when start. Thanks you, I apreciate any help!

The Entery code:

.class public final Lcom/sube/subemobileclient/b/b/b/b/b/a$a;
.super Ljava/lang/Object;


# annotations
.annotation system Ldalvik/annotation/EnclosingClass;
    value = Lcom/sube/subemobileclient/b/b/b/b/b/a;
.end annotation

.annotation system Ldalvik/annotation/InnerClass;
    accessFlags = 0x9
    name = "a"
.end annotation


# instance fields
.field public a:B

.field public b:B

.field public c:[B


# direct methods
.method public constructor <init>()V
    .locals 0

    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    return-void
.end method

.method public constructor <init>(BB[B)V
    .locals 0

    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    iput-byte p1, p0, Lcom/sube/subemobileclient/b/b/b/b/b/a$a;->a:B

    iput-byte p2, p0, Lcom/sube/subemobileclient/b/b/b/b/b/a$a;->b:B

    iput-object p3, p0, Lcom/sube/subemobileclient/b/b/b/b/b/a$a;->c:[B

    return-void
.end method


# virtual methods
.method public final toString()Ljava/lang/String;
    .locals 3

    new-instance v0, Ljava/lang/StringBuilder;

    invoke-direct {v0}, Ljava/lang/StringBuilder;-><init>()V

    new-instance v1, Ljava/lang/StringBuilder;

    const-string v2, "Sector: "

    invoke-direct {v1, v2}, Ljava/lang/StringBuilder;-><init>(Ljava/lang/String;)V

    iget-byte v2, p0, Lcom/sube/subemobileclient/b/b/b/b/b/a$a;->a:B

    invoke-virtual {v1, v2}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;

    invoke-virtual {v1}, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;

    move-result-object v1

    invoke-virtual {v0, v1}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;

    const-string v1, "line.separator"

    invoke-static {v1}, Ljava/lang/System;->getProperty(Ljava/lang/String;)Ljava/lang/String;

    move-result-object v1

    invoke-virtual {v0, v1}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;

    new-instance v1, Ljava/lang/StringBuilder;

    const-string v2, "Key Type: "

    invoke-direct {v1, v2}, Ljava/lang/StringBuilder;-><init>(Ljava/lang/String;)V

    iget-byte v2, p0, Lcom/sube/subemobileclient/b/b/b/b/b/a$a;->b:B

    invoke-virtual {v1, v2}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;

    invoke-virtual {v1}, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;

    move-result-object v1

    invoke-virtual {v0, v1}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;

    const-string v1, "line.separator"

    invoke-static {v1}, Ljava/lang/System;->getProperty(Ljava/lang/String;)Ljava/lang/String;

    move-result-object v1

    invoke-virtual {v0, v1}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;

    new-instance v1, Ljava/lang/StringBuilder;

    const-string v2, "Key: "

    invoke-direct {v1, v2}, Ljava/lang/StringBuilder;-><init>(Ljava/lang/String;)V

    iget-object v2, p0, Lcom/sube/subemobileclient/b/b/b/b/b/a$a;->c:[B

    invoke-static {v2}, Ljava/util/Arrays;->toString([B)Ljava/lang/String;





    **HEREHEREHERE**  So message to display = "Key: ...." 




    move-result-object v2

    invoke-virtual {v1, v2}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;

    invoke-virtual {v1}, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;

    move-result-object v1

    invoke-virtual {v0, v1}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;

    const-string v1, "line.separator"

    invoke-static {v1}, Ljava/lang/System;->getProperty(Ljava/lang/String;)Ljava/lang/String;

    move-result-object v1

    invoke-virtual {v0, v1}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;

    invoke-virtual {v0}, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;

    move-result-object v0

.end method

JAVA

   public final String toString() {
        StringBuilder stringBuilder = new StringBuilder();
        StringBuilder stringBuilder2 = new StringBuilder("Sector: ");
        stringBuilder2.append(this.f892a);
        stringBuilder.append(stringBuilder2.toString());
        stringBuilder.append(System.getProperty("line.separator"));
        stringBuilder2 = new StringBuilder("Key Type: ");
        stringBuilder2.append(this.f893b);
        stringBuilder.append(stringBuilder2.toString());
        stringBuilder.append(System.getProperty("line.separator"));
        stringBuilder2 = new StringBuilder("Key: ");
        stringBuilder2.append(Arrays.toString(this.f894c));
        stringBuilder.append(stringBuilder2.toString());
        stringBuilder.append(System.getProperty("line.separator"));
        return stringBuilder.toString();
    }

Answer 1

You can generate Smali code from Java just like from any Android App. Therefore you can simply write a very small Android app that contains your code.

Create a simple app in AndroidStudio that contains the code. Build the app and the decompile the apk file using apktool and you have your Java code converted to Smali code.

The easiest way should be to create a new function that can then be injected into the existing Smali code and called from an existing function.

Or the same way but using some shortcuts:

.java --> .class --> dex -> smali

Compile Java to a class file (AFAIR you have to use Java 7 as target). Then convert the code to a dex file using dx (java -jar dx.jar ) tool from Android SDK. And in the end decompile it with apktool .