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I have an APK file and decompile it using APKtool and get all the source code as smali files, I want to modify the bytecode to show the user a message when he tries to open the camera and take a pic

Below the code I added to the smali file, wrote it in java an convert it to bytecode using java2smali

.prologue
.line 13
new-instance v0, Landroidx/appcompat/app/AlertDialog$Builder;

invoke-direct {v0, p0}, Landroidx/appcompat/app/AlertDialog$Builder;-><init>(Landroid/content/Context;)V

.line 14
.local v0, "dlgAlert":Landroidx/appcompat/app/AlertDialog$Builder;
const-string v1, "This is an alert with no consequence"

invoke-virtual {v0, v1}, Landroidx/appcompat/app/AlertDialog$Builder;->setMessage(Ljava/lang/CharSequence;)Landroidx/appcompat/app/AlertDialog$Builder;

.line 15
const-string v1, "App Title"

invoke-virtual {v0, v1}, Landroidx/appcompat/app/AlertDialog$Builder;->setTitle(Ljava/lang/CharSequence;)Landroidx/appcompat/app/AlertDialog$Builder;

.line 16
const-string v1, "Ok"

new-instance v2, Lbrut/example/install_file/Method2$1;

invoke-direct {v2, p0}, Lbrut/example/install_file/Method2$1;-><init>(Lbrut/example/install_file/Method2;)V

invoke-virtual {v0, v1, v2}, Landroidx/appcompat/app/AlertDialog$Builder;->setPositiveButton(Ljava/lang/CharSequence;Landroid/content/DialogInterface$OnClickListener;)Landroidx/appcompat/app/AlertDialog$Builder;

.line 22
const/4 v1, 0x1

invoke-virtual {v0, v1}, Landroidx/appcompat/app/AlertDialog$Builder;->setCancelable(Z)Landroidx/appcompat/app/AlertDialog$Builder;

.line 23
invoke-virtual {v0}, Landroidx/appcompat/app/AlertDialog$Builder;->create()Landroidx/appcompat/app/AlertDialog;

move-result-object v1

invoke-virtual {v1}, Landroidx/appcompat/app/AlertDialog;->show()V

.line 24
return-void

I added them directly to smali files before every

takePicture() method or Intent(MediaStore.ACTION_IMAGE_CAPTURE)

but the code is not working and the message is not displayed when user take a picture so, is there another method that can be used to take a picture in Android application that I need to insert this bytecode before it or maybe there is something wrong in the bytecode I'm using?

Fatima Hassan
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    First I would recommend not to insert the code into the target function, instead make it a static method add it to a new or existing class and then just call it. Have you read the documentation that the Camera class is deprecated since API 21? For examples on Camera2 interface see SO e.g. [this question](https://stackoverflow.com/q/42951837/150978). – Robert Mar 05 '22 at 12:47

0 Answers0