[Sprint Samsung Galaxy S III] Didact74:
I built this guide for the VW GS3 but I have to assume its extremely close for the Sprint varient as well.

The lockscreen torch will allow you to quickly turn on your flashlight from the lockscreen. Simply hold the home button in for torch, let it go and it will turn off. It is meant to function this way so you dont accidentally turn it on in your pocket or something and forget about it. Not sure who originally wrote the MOD but I have spent some time re-writing it to fit the GS3 based on a dozen or so other tutorials.

After reboot, it will take about 20 seconds before the MOD will engage. Then it will work at will as long as you are on the lockscreen.

I will include the three files that are being modified in the zip below so you can use them in your compare tool.

DEVs if you want to use this in your ROM feel free, just shoot me some credit and some thanks!

Hit the Thanks Button!

Here is the guide.....

First you will need to download the torch file below and drop it in /system/app. This will be in the zip file with the smali files.

We will be working with three smali files inside of android.policy.jar.

Navigate to smali/com/android/internal/policy/impl/KeyguardViewMediator$2.smali

Find the following code and add the part in RED

packed-switch v2, :pswitch_data_0

.line 1172
:goto_0
[COLOR="Red"][B] :pswitch_0
[/B][/COLOR] return-void

Find the 13 : pswitch_ lines and increase them by 1. For example

:pswitch_0 becomes :pswitch_1
:pswitch_1 becomes :pswitch_2
:pswitch_2 becomes :pswitch_3
:pswitch_3 becomes :pswitch_4
:pswitch_4 becomes :pswitch_5
:pswitch_5 becomes :pswitch_6
:pswitch_6 becomes :pswitch_7
:pswitch_7 becomes :pswitch_8
:pswitch_8 becomes :pswitch_9
:pswitch_9 becomes :pswitch_a
:pswitch_a becomes :pswitch_b
:pswitch_b becomes :pswitch_c
:pswitch_c becomes :pswitch_d

Find the following code

invoke-static {v0}, Lcom/android/internal/policy/impl/KeyguardViewMediator;->access$300(Lcom/android/internal/policy/impl/KeyguardViewMediator;)V

.line 1169
monitor-exit v1

goto :goto_0

Add the following directly after

.line 974
:pswitch_e
iget-object v2, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator$2;->this$0:Lcom/android/internal/policy/impl/KeyguardViewMediator;

iget v3, p1, Landroid/os/Message;->arg1:I

if-eqz v3, :cond_2

move v3, v0

:goto_3
#calls: Lcom/android/internal/policy/impl/KeyguardViewMediator;->handleSetTorch(Z)V
invoke-static {v2, v3}, Lcom/android/internal/policy/impl/KeyguardViewMediator;->access$1900(Lcom/android/internal/policy/impl/KeyguardViewMediator;Z)V

goto :goto_0

:cond_2
move v3, v1

goto :goto_3

Find the "nop' at the end and add another one right below it

throw v0

.line 1129
nop

nop

Find the stack of : pswitch_ lines at the end of the smali and delete : pswitch_0

Then add the following so the entire stack will end up looking like this

.packed-switch 0x1

:pswitch_1
:pswitch_2
:pswitch_3
:pswitch_4
:pswitch_5
:pswitch_6
:pswitch_7
:pswitch_8
:pswitch_9
:pswitch_a
:pswitch_b
:pswitch_c
:pswitch_d
:pswitch_0
:pswitch_0
:pswitch_0
:pswitch_0
:pswitch_0
:pswitch_0
:pswitch_e
.end packed-switch
.end method

Thats it for KeyguardViewMediator$2.smali. Save and close the file.

Navigate to smali/com/android/internal/policy/impl/KeyguardViewMediator.smali

Find the following code

.field private static final SET_HIDDEN:I = 0xc

Add this right after

[hide]
.field private static final SET_TORCH:I = 0x14

Find the following code

.field private mTelephonyManager:Landroid/telephony/TelephonyManager;

Add this right after

.field private mTorchEnabled:Z

.field private mTorchStateChanged:Z

Find the following code

const/4 v10, 0x0

const/4 v9, 0x1

.line 301
invoke-direct {p0}, Ljava/lang/Object;-><init>()V

Add this after

iput-boolean v9, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mTorchEnabled:Z

Find the following code

iput-object v0, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mHandler:Landroid/os/Handler;

.line 302
iput-object p1, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mContext:Landroid/content/Context;

.line 304
iput-object p3, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mRealPowerManager:Landroid/os/LocalPowerManager;

Add this after

iput-boolean v10, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mTorchEnabled:Z

.line 1188
iput-boolean v10, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mTorchStateChanged:Z

Find this method

.method static synthetic access$200(Lcom/android/internal/policy/impl/KeyguardViewMediator;)V

Add this entire NEW method RIGHT BEFORE it.

.method static synthetic access$1900(Lcom/android/internal/policy/impl/KeyguardViewMediator;Z)V
.locals 0
.parameter "x0"
.parameter "x1"

.prologue
invoke-direct {p0, p1}, Lcom/android/internal/policy/impl/KeyguardViewMediator;->handleSetTorch(Z)V

return-void
.end method

Find the following code

const/4 v0, 0x1

invoke-direct {p0, v0}, Lcom/android/internal/policy/impl/KeyguardViewMediator;->adjustLocked(Z)V

.line 1315
monitor-exit p0

Add this right after

invoke-direct {p0}, Lcom/android/internal/policy/impl/KeyguardViewMediator;->resetTorchState()V

Find the following code

.line 1496
iget-object v0, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mKeyguardViewManager:Lcom/android/internal/policy/impl/KeyguardViewManager;

invoke-virtual {v0}, Lcom/android/internal/policy/impl/KeyguardViewManager;->onScreenTurnedOff()V

.line 1497
monitor-exit p0

Add this directly after

invoke-direct {p0}, Lcom/android/internal/policy/impl/KeyguardViewMediator;->resetTorchState()V

Find the following code

iput-boolean p1, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mHidden:Z

.line 611
invoke-direct {p0}, Lcom/android/internal/policy/impl/KeyguardViewMediator;->adjustUserActivityLocked()V

.line 612
invoke-direct {p0}, Lcom/android/internal/policy/impl/KeyguardViewMediator;->adjustStatusBarLocked()V

Add this directly after

invoke-direct {p0}, Lcom/android/internal/policy/impl/KeyguardViewMediator;->resetTorchState()V

Find the following code

:try_end_0
.catchall {:try_start_0 .. :try_end_0} :catchall_0

throw v0
.end method

Add this ENTIRE NEW METHOD directly after

.method private handleSetTorch(Z)V
.locals 6
.parameter "enable"

.prologue
const/4 v5, 0x0

const/4 v4, 0x1

.line 504
:try_start_0
iget-boolean v1, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mTorchStateChanged:Z

if-nez v1, :cond_1

.line 505
iput-boolean v1, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mTorchEnabled:Z

.line 506
const/4 v1, 0x1

iput-boolean v1, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mTorchStateChanged:Z

.line 515
:cond_0
:goto_0
return-void

.line 507
:cond_1
iget-boolean v1, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mTorchEnabled:Z

if-eq v1, p1, :cond_0

.line 508
iput-boolean p1, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mTorchEnabled:Z

.line 509
new-instance v0, Landroid/content/Intent;

const-string v1, "net.cactii.flash2.TOGGLE_FLASHLIGHT"

invoke-direct {v0, v1}, Landroid/content/Intent;-><init>(Ljava/lang/String;)V

.line 510
.local v0, intent:Landroid/content/Intent;
const-string v1, "net.cactii.flash2.EXTRA_DISABLE_NOTIFICATION"

const/4 v2, 0x1

invoke-virtual {v0, v1, v2}, Landroid/content/Intent;->putExtra(Ljava/lang/String;Z)Landroid/content/Intent;

.line 511
iget-object v1, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mContext:Landroid/content/Context;

invoke-virtual {v1, v0}, Landroid/content/Context;->sendBroadcast(Landroid/content/Intent;)V
:try_end_0
.catch Ljava/lang/Exception; {:try_start_0 .. :try_end_0} :catch_0

goto :goto_0

.line 514
.end local v0 #intent:Landroid/content/Intent;
:catch_0
move-exception v1

goto :goto_0
.end method

Find the following code

:goto_1
:try_start_2
iget-object v0, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mShowKeyguardWakeLock:Landroid/os/PowerManager$WakeLock;

invoke-virtual {v0}, Landroid/os/PowerManager$WakeLock;->release()V

Add the following after

.line 995
const/4 v0, 0x1

iput-boolean v0, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mTorchStateChanged:Z

Find the following code

iget-object v1, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mHandler:Landroid/os/Handler;

invoke-virtual {v1, v0}, Landroid/os/Handler;->sendMessage(Landroid/os/Message;)Z

.line 752
return-void
.end method

Add this ENTIRE NEW METHOD after

.method private resetTorchState()V
.locals 1

.prologue
.line 1193
iget-boolean v0, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mTorchStateChanged:Z

if-eqz v0, :cond_0

.line 1194
const/4 v0, 0x0

invoke-direct {p0, v0}, Lcom/android/internal/policy/impl/KeyguardViewMediator;->handleSetTorch(Z)V

.line 1196
:cond_0
return-void
.end method

Find the following code

:try_end_3
.catchall {:try_start_3 .. :try_end_3} :catchall_0

goto :goto_1
.end method

Add this ENTIRE NEW METHOD after

.method public setTorch(Z)V
.locals 5
.parameter "enable"

.prologue
const/16 v4, 0x14

const/4 v3, 0x0

.line 1155
iget-boolean v1, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mScreenOn:Z

if-eqz v1, :cond_0

.line 1157
iget-object v1, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mHandler:Landroid/os/Handler;

invoke-virtual {v1, v4}, Landroid/os/Handler;->removeMessages(I)V

.line 1158
iget-object v1, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mHandler:Landroid/os/Handler;

if-eqz p1, :cond_1

const/4 v2, 0x1

:goto_0
invoke-virtual {v1, v4, v2, v3}, Landroid/os/Handler;->obtainMessage(III)Landroid/os/Message;

move-result-object v0

.line 1159
.local v0, msg:Landroid/os/Message;
iget-object v1, p0, Lcom/android/internal/policy/impl/KeyguardViewMediator;->mHandler:Landroid/os/Handler;

invoke-virtual {v1, v0}, Landroid/os/Handler;->sendMessage(Landroid/os/Message;)Z

.line 1161
.end local v0 #msg:Landroid/os/Message;
:cond_0
return-void

:cond_1
move v2, v3

.line 1158
goto :goto_0
.end method

Thats it for KeyguardViewMediator.smali. Save the file and close.

Navigate to smali/com/android/internal/policy/impl/PhoneWindowManager.smali

Find the following code

const/16 v41, 0x3

move/from16 v0, v22

move/from16 v1, v41

Change the next line to the following

if-ne v0, v1, :cond_2b

Find the following code

invoke-static/range {v41 .. v42}, Landroid/util/safelog/Log;->i(Ljava/lang/String;Ljava/lang/String;)I

goto :goto_a

:cond_20

Change the next line to the following

if-eqz v4, :cond_26

Find the following code

const/16 v41, 0x7d9

move/from16 v0, v38

move/from16 v1, v41

Change the next line to the following

if-ne v0, v1, :cond_23

Directly after that last change in code, add the following

:cond_21
move-object/from16 v0, p0

iget-object v0, v0, Lcom/android/internal/policy/impl/PhoneWindowManager;->mKeyguardMediator:Lcom/android/internal/policy/impl/KeyguardViewMediator;

move-object/from16 v41, v0

invoke-virtual/range {v41 .. v41}, Lcom/android/internal/policy/impl/KeyguardViewMediator;->isShowingAndNotHidden()Z

move-result v41

if-eqz v41, :cond_22

.line 1275
move-object/from16 v0, p0

iget-object v0, v0, Lcom/android/internal/policy/impl/PhoneWindowManager;->mKeyguardMediator:Lcom/android/internal/policy/impl/KeyguardViewMediator;

move-object/from16 v41, v0

move-object/from16 v0, v41

move v1, v8

invoke-virtual {v0, v1}, Lcom/android/internal/policy/impl/KeyguardViewMediator;->setTorch(Z)V

.line 1276
rem-int/lit8 v41, v31, 0xf

if-nez v41, :cond_22

.line 1277
move-object/from16 v0, p0

iget-object v0, v0, Lcom/android/internal/policy/impl/PhoneWindowManager;->mKeyguardMediator:Lcom/android/internal/policy/impl/KeyguardViewMediator;

move-object/from16 v41, v0

invoke-virtual/range {v41 .. v41}, Lcom/android/internal/policy/impl/KeyguardViewMediator;->pokeWakelock()V

:cond_22

Here is a sort of tricky part. Starting right after the above code change you need to comb the rest of this entire method for all references to ":cond_X" and increment them by one. THERE ARE A LOT! Take your time and find them all. For example

:cond_23 becomes :cond_24
:cond_29 becomes :cond_2a
:cond_3f becomes :cond_40
....etc. MAKE SURE YOU FIND THEM ALL! The last one you change should be :cond_47.

[/hide]

Thats it. Save all fines, recompile and push to /system/framework.

Enjoy and hit the Thanks Button!