How to pull apk from the installed application. How to extract APK file installed in Android

Interpolation, interpolating - In computing mathematics, the method of finding intermediate values \u200b\u200bof the value according to the existing discrete set of known values.

Many of those who face scientific and engineering calculations often have to operate with sets of values \u200b\u200bobtained by experienced by way or by random sampling. As a rule, on the basis of these sets, it is necessary to construct a function on which other obtained values \u200b\u200bcould fall with high accuracy. This task is called approximation. Interpolation is called such a kind of approximation, in which the curve of the constructed function passes exactly through the available data points.

There are many of course difference methods of interpolation. Most
The Newton method is common to interpolation "Forward" (Newton - Gregory Method). Interpolation polynomial in this case has the form:

Coefficients with find by formula:

Implementation of the C # program:
using SYSTEM; Namespace Interpolation (Class Program ...

The program is divided into two streams in one of which sorting is performed, and in another redrawing graphical interface. After clicking on the "Sort" button, the program is called "RunSorting", which determines the sorting algorithm and a new stream is created with the sorting process running in it.
private void Runso ...

Sharing resources (CORS) is a W3C specification that allows you to carry out an interact link in the browser. Creating on top of the XMLHTTPRequest object, CORS allows developers to work with the same idioms as requests with one domain. Use option for CORS is simple. Imagine that Alice.com has some data that Bob.com wants to get. This type of query is traditionally not allowed in accordance with the same policy of origin of the browser. However, supporting Cors, Alice.com requests can add several special response headers that allow Bob.com to access data. As can be seen from this example, CORS support requires coordination between the server and the client. Fortunately, if you are a developer on the client side, you are protected from most of these details. The rest of this article shows how customers can perform requests with cross-start and as servers can configure themselves to support CORS. Continue ...

Hello everyone, today I want to show the code for another project, which is absolutely useless and written exclusively for entertainment. Once we had a teacher at the lesson and we so that at least somehow entertain yourself began to write on Pascal. It all started with a simple siren, which forced system blocks in the audience to issue sounds, similar sirens of ambulance cars. All the houses ended, writing a fragment of the song Linkin Park - Numb.

Here is the actual program:
Uses CRT; VAR I, TEMP, NOTE, NOTE2, NOTE4, NOTE8: Integer; Procedure PlayNote (F, P: Integer); Begin Sound (F); Delay (P); Nosound; Delay (20); End; Procedure Pause (P: Integer); Begin Delay (P); End; Procedure Numb (TEMP, NOTE, NOTE2, NOTE4, NOTE8: Integer); Begin for i: \u003d 0 to 1 Do Begin Playnote (880, Note4); PlayNote (1047, Note4); PlayNote (880, Note4); PlayNote (1175, Note2 + Note4); PlayNote (1397, Note2 + Note4); PlayNote (1319, Note ...

Many Android users know that using the Titanium Backup application, you can pull out the application from the device as an APK file. Today we will look at the way with which you can pull out the APK application file directly from Google Play Store.

The plus of this method is the absence of the need to pre-install the application on the device. Unfortunately, this method works only for free applications. So, what we need:

1. Google Chrome

Create on the desktop the second label for Google Chrome.

We make the label right click, choose the "properties". In the "Object" field, add the following commands through the space:

Ignore-Certificate-Errors

Allow-Running-Insecure-Content

It turns out something like this:

... \\ chrome.exe "--GNORE-CERTIFICATE-Errors --allow-Running-Insecure-Content

Click "Apply" and "OK".

After this operation, you need to restart the browser by closing all running application instances.

2. Google account name and device ID

In fact, we are going to imitate the download of the application to the device, so you need to know the name of your account, that is, the name of your Google mailbox, as well as the identification number of your Android device.

With a drawer, everything is clear, and to learn the device ID, open the dialer on your smartphone and type * # * # 8255 # *

On the screen that appears, you need to find the "Device ID:"

The identification number is a combination of letters and numbers next after Android. For example, if you see "Device ID: Android-1122AA33BB445577" in the line, then the identifier is the combination "1122A33BB445577". Write down this combination.

If for some reason you can't get to know your Device ID indicated above, you can simply download the Device ID application on Google Play Store.

3. APK Downloader.

Download an extension for a browser called APK Downloader.

In the window that appears, enter the address of our Google Account, that is, the email address. Password (Aha, scary), as well as Device ID. After that, click "Login".

In the next window, select your country and cellular operator, then click "Save Settings". Next, a window should appear with a message about the successful activation of expansion.

4. Google Play Store

Now go to our favorite Google Play Store and choose any free app. On the right side of the address bar of the browser will appear the characteristic view of the green head with the arrow.

Click on this icon, and the application is successfully loaded onto the computer as an APK file. In fact, now we can create Standalone distributions of free applications.

Make sure the absolute decency of the expansion developer APK DOWNLOADER is not possible, so enter your account data for your own fear and risk. In addition, such actions in principle violate the rules for using Google Play Store.

Hello readers of our site. Somehow one of the visitors asked for help, he needed to extract APK files from the Android-smartphone. Thus, we decided to describe the answer to this question in this article. With this operation, you can make a reservation of all installed applications on the smartphone, tablet or other gadgets that are running the Android operating system.

In what cases is the redundancy of installed applications?

The situation is the first. You need to reset the phone to the factory settings, but there is no access to the Internet or only mobile. You do not want to download a new application from Google Play then, as it takes a lot of time. It is for such cases that there is the possibility of extracting APK files from the Android device or.

The situation is second.You have an installed exciting game, the cache of which "weighs" is very much, and I liked your friend, and he wanted myself the same toy but, again, there is no access to the Internet. There will have to make a reservation of the installed game. With the instructions for the correct installation of the cashe game can be found.

There are many such situations.

How to remove APK files from the Android device?

To perform this task, we use the free "ES Explorer" application, which can be found on Google Play. Why this is this conductor? Yes, everything is simple, it is an excellent and easy-to-use file manager and it already has an integrated application backup feature. Using this feature, you can extract the desired APK files from Android devices.

Method 1.So, you installed "ES Explorer", now launch it:

Picture 1

Go to the application menu To do this, press the button specified by us in the upper left corner of the device screen. Reveal the section "Libraries" and click Apps.

Figure 2.

If you are all done correctly - you will open a window with installed user applications. Next, select the application that needs to be removed and press the button Reserve At the bottom of the screen.

Figure 3 Figure 4

All recovered applications are in the folder « Phone memory /backups /apps. " You may notice that in Figure 3 and 4 some files are highlighted in red or green, so: green colors are marked with applications that were reserved earlier and are in the folder apps. and red - applications that were also extracted earlier but removed from the folder apps. (Only extracted files, not installed) deleted. Here in principle, and everything related to the extraction in this way.

Figure 5.

Now with these files you can do anything: throw off to a computer, send to a friend via Bluetooth or email. Recall once again - this method makes backup only those applications that were installed by the user, but not systemic. To reduce system applications, use the method 2.

Method 2. Run the same "ES conductor". At the top of the screen, there is a selection of memory partitions (Figure 6) or go to the "Local Storage" menu (Figure 7) and select item /Device .

Figure 6 Figure 7

Next you need to go to system / App. . Here are all applications that are installed on the device: both custom and systemic. Then we are looking for the desired APK file and copy it to the desired folder. Thus, you will receive a ready-made APK file to install on other gadgets.

A warning! For both ways, perhaps will have. It is quite acceptable that some extracted system APK files may not be installed on other Android devices due to the fact that they are designed for a specific firmware.

That's all.

We hope that this post helped to solve the task and you managed to extract APK files from the Android device. If you are known other ways to reduce programs or have similar questions - write to us.

Stay with us, there is still a lot of interesting things.

Imagine the following situation: you set the game on Android, passed it and removed, but you liked it and you probably want to play it once yet. But in order not to forget about this game, and once again you do not download it, you can extract the file file and take advantage of them.

Instruction: Remove APK in Android

1. Go to Astro File Manager and make swipe left.

2. Additional tools will open. Select "Application Manager".

3. Select applications, the APK files you want to remove. To do this, just tapare on them. If you want to choose all applications, click on the icon at the top of the screen.

4. At the bottom two new options will appear. Click on "Backup".

5. After that, file copy will begin.

Extracted APK files will be on the SD card in the "Backups" folder, as well as in the Astro File Manager application manager in the "Copied Applications" section.

That's all. I hope that this instruction has been useful to you.

Sometimes some applications on Android are not satisfied with the user. As an example, you can cite udigue advertising. And it happens and so - everyone is good for the program, but only there is no translation in it or a curve, or there is no one. Or, for example, a trial program, and there is no full version of the possibility. How to change the situation?

Introduction

In this article we will talk about how to disassemble the APK package with the application, consider its internal structure, disassemble and decompiling byte code, and try to make several changes to applications that can bring us one or another.

To do all this on your own, you will need at least the initial knowledge of the Java language on which the Android applications are written, and the XML language that is used in Android is everywhere - from the description of the application itself and its access rights to storing the lines that will be displayed on the screen. Also need the ability to handle specialized console software.

So, what is the package apk, which covers absolutely all software for Android?

Decompiling applications

In the article, we worked only with the disassembly application code, however, if you make more serious changes in large applications, the SMALI code will be much more complicated. Fortunately, we can decompile the DEX code in a Java code, which will be not original and not compiled back, but much easier to read and understand the logic of the application. To do this, we will need two tools:

dex2Jar - the Dalvik byte-code translator in the JVM byte code, on the basis of which we can get the code in the Java language;
jD-GUI is a decompiler itself, which allows you to get a readable Java code from the JVM byte-code. Alternatively, you can use jad (www.varaneckas.com/jad); Although it is quite old, but in some cases generates more readable code than JD-GUI.

Use them follows. First, launch Dex2JAR, pointing out the path as an argument to APK-package:

% Dex2jar.sh Mail.apk.

As a result, the Mail.jar java package will appear in the current directory, which can already be opened in JD-GUI to view the Java code.

APK package device and getting them

The Android application package is essentially a regular zip file, to view the contents and unpacking of which no special tools are required. It is enough to have an archiver - 7zip for Windows or a console UNZIP in Linux. But it concerns wrapper. What inside? Inside, we generally have such a structure:

META-INF / - contains a digital certificate of the application certifying its creator, and the checksum amounts of the package files;
rES / - various resources that the application uses in its work, such as images, a declarative description of the interface, as well as other data;
Androidmanifest.xml. - Application description. This includes, for example, a list of required permissions, the desired Android version and the required screen resolution;
classes.dex. - Compiled byte application application for the Dalvik virtual machine;
resources.arsc. - also resources, but another kind - in particular, lines (yes, this file can be used for Russification!).

The listed files and directories are if not in all, then, perhaps, in the absolute majority APK. However, it is worth mentioning a few not so much common files / directories:

assets. - analogue of resources. The main difference is to access the resource. It is necessary to know its identifier, the Asset list can be obtained dynamically using the AssetManager.List () method in the application code;
lib - Native Linux libraries written using NDK (Native Development Kit).

This directory uses game manufacturers, placing the game engine there, written in C / C ++, as well as creators of high-performance applications (for example, Google Chrome). The device figured out. But how to get a file of the package of the application of interest? Since without root from the device to pick up APK files is not possible (they lie in the / Data / App directory), and it is not always appropriate to handle, there is at least three ways to get the application file to the computer:

apk Downloader extension for chrome;
application Real APK LEECHER;
various file sharing and lumpy.

Which one to use is a matter of taste; We prefer to use individual applications, so we describe the use of Real APK LEECHER, especially as it is written on Java and, accordingly, it will work at least in Windows, even in Nixes.

After starting the program, you must fill out three fields: Email, Password and Device ID - and choose a language. The first two are e-mail and your googleaccount password, which you use on the device. The third is the identifier of the device, and it can be obtained by typing the code on the dialer # #8255## And then finding the Device ID string. When filling, you need to enter only the ID without the Android prefix.

After filling and saving, the message "Error While Connecting to Server" pops up. It is not related to Google Play, so boldly it ignores it and look for packages you are interested in.

View and modification

Suppose you have found the package that interests you, downloaded, unpacked ... And when trying to view any XML file, it was surprised to find that the file is not text. What to decompile and how to work with packages? Is it really necessary to put an SDK? No, the SDK is not at all necessary. In fact, for all steps to unpack, modify and package packaging APK need the following tools:

archiver Zip. for unpacking and searches;
smali. - assembler / disassembler byte-code of the Dalvik virtual machine (code.google.com/p/smali);
aapt. - a resource tool (by default resources are stored in binary form to optimize application performance). It is included in the Android SDK, but can be obtained separately;
signer. - A tool for digital signature of the modified package (bit.ly/rmrv4m).

You can use all these tools individually, but it is inconvenient, therefore it is better to use a higher-level software built on them. If you work in Linux or Mac OS X, then there is a tool called apktool. It allows you to unpack resources in the original type (including binary XML and ARSC files), reoper a package with modified resources, but does not know how to sign packets, so run the SIGNER utility will have to manually. Despite the fact that the utility is written in Java, its installation is quite non-standard. First you should get the JAR file itself:

$ CD / TMP $ wget http://bit.ly/wc3ocz $ tar -xjf apktool1.5.1.tar.bz2

$ Wget http://bit.ly/wrjec7 $ tar -xjf apktool-install-linux-r05-ibot.tar.bz2

$ MV APKTOOL.JAR ~ / BIN $ MV APKTOOL-INSTALL-LINUX-R05-IBOT / * ~ / BIN $ Export Path \u003d ~ / Bin: $ Path

If you work in Windows, it has an excellent tool calledVirtuous Ten Studio, which also accumulates all these tools (including APKTOOL itself), but instead of the CLI interface provides the user with an intuitive graphical interface with which you can perform operations on unpacking, disassembling and decompiling into several clicks. This donation-ware tool, that is, sometimes appears windows with a proposal to get a license, but this is, in the end, you can suffer. It does not make any point in describing it, because you can understand the interface in a few minutes. But apktool, due to its console nature, should be discussed in more detail.

Consider the Apktool options. In short, there are three main commands: D (Decode), B (Build) and if (Install Framework). If everything is clear with the first two teams, what does the third conditional operator do? It unpacks the specified UI framework, which is necessary in cases where you displays any system package.

Consider the most interesting options of the first team:

-s. - do not disassemble the DEX files;
-r. - Do not unpack resources;
-b. - do not insert debug information into the results of disassembling the DEX file;
--Frame-Path. - Use the specified UI framework instead of the built-in apktool. Now consider a couple of options for the B team:
-f. - forced assembly without checking changes;
-a. - Indicate the path to AAPT (tool for assembling APK-archive), if you want to use it from another source for some reason.

APKTOOL is very easy to use, it is enough to specify one of the commands and the path to APK, for example:

$ apktool d mail.apk

After that, all extracted and disassembly package files will appear in the Mail directory.

Preparability. Turn off advertising

The theory is, of course, well, but why is it needed if we do not know what to do with a unpacked package? Let's try to apply the theory with benefit for yourself, namely, we modify some softyn so that it does not show us advertising. For example, let it be Virtual Torch - a virtual torch. For us, this software will fit perfectly, because it is striking with annoying advertising and is also quite simple, so as not to get lost in the codes.

So, with one of the following methods, download the application from the market. If you decide to use Virtuous Ten Studio, simply open the APK file in the application and unpack it, for what to create a project (File -\u003e New Project), then select the Import File in the context menu. If your choice fell on apktool, it is enough to execute one command:

$ apktool d com.kauf.particle.virtualtorch.apk

After that, the COM.KAUF.Particle.VirtualTorch directory will appear a file tree similar to that described in the previous section, but with an optional Smali directory instead of Dex files and a apktool file .yml. The first contains a disassembly application code of the executable DEX file of the application, the second - the service information needed by APKTOOL to build a package back.

The first place where we must look are, of course, androidmanifest.xml. And here we immediately celebrate the following line:

It is not difficult to guess that she is responsible for providing the application to the use of the Internet connection. In fact, if we want to just get rid of advertising, we will most likely have enough to ban the Internet application. Let's try to do it. We delete the specified string and try to collect software using APKTOOL:

$ apktool b com.kauf.particle.virtualTorch

The com.kauf.particle.VirtualTorch / Build / Build / Build / Build / Build / BUILD / will appear. However, it will not be possible to install it, as it does not have a digital signature and checksums of files (there is simply no META-INF directory in it). We must sign a package using the APK-SIGNER utility. Started. The interface consists of two tabs - on the first (key generator) we create keys to the second (APK Signer). To create our private key, fill in the following fields:

Target file. - the output key storage file; It is usually stored one pair of keys;
Password. and Confirm. - Password for the repository;
Alias. - the name of the key in the repository;
Alias \u200b\u200bPassword. and Confirm. - password secret key;
Validity - validity period (in years). The default value is optimal.

The remaining fields, in general, are optional - but it is necessary to fill at least one.

Warning

To sign the application using APK-Signer, you must install Android SDK and specify the full path to it in the application settings.

All information is provided solely for informational purposes. Neither the editors nor the author are responsible for any possible harm caused by the materials of this article.

Now this key can be signed apk. On the APK Signer tab, select the newly generated file, enter a password, an alias of a key and a password to it, then find the file APK and boldly press the "SIGN" button. If everything goes fine, the package will be signed.

Info.

Since we have signed a package by our own key, it will conflict with the original application, which means that when you try to update my softy in the market, we will get a mistake.

Digital signature is needed only by third-party software, so if you are modified by system applications that are installed by copying to the / System / App / App / App / App, then you do not need to sign them.

After that, we throw off the package on your smartphone, install and run. Voila, advertising disappeared! Instead, however, a message appeared that we have no Internet or there are no appropriate permissions. In theory, this could have enough, but the message looks annoying, and, and, honestly, we were just lucky with a blunt application. Normally written software, most likely, will clarify its powers or check the presence of an Internet connection and otherwise it will simply refuse to start. How to be in this case? Of course, edit the code.

Usually the authors of the application create special classes for advertising and cause methods of these classes during the launch of the application or one of its "activities" (simplistic speaking, application screens). Let's try to find these classes. We go to the Smali directory, then COM (in ORG only the open Cocos2D graphics library), followed by Kauf (it is there, because this is the name of the developer and there is all its code) - And here it is, the Marketing catalog. Inside, we find a bunch of files with the expansion of Smali. These are classes, and the most remarkable class AD.Smali is most noteworthy, by the name of which it is not difficult to guess what it brings advertising.

We could change the logic of its work, but much easier will be stupidly remove the challenges of any methods from the application itself. Therefore, we leave from the Marketing directory and go to the nearby Particle directory, and then in VirtualTorch. Special attention here deserves the MainActivity.smali file. This is a standard for Android class, which is created by Android SDK and is installed as an input point of the application (analogue of the Main function in C). Open the file to edit.

Inside is the SMALI code (local assembler). It is quite tangled and difficult to read by virtue of its low-level nature, so we will not study it, but just find all the references to the class AD in the code and comment on them. Drive the string "AD" in the search and fall on the line 25:

Field Private AD: LCOM / KAUF / MARKETING / AD;

The AD field is created here for storing the class AD object. Let's comment using the ### sign set before the string. We continue to search. Row 423:

NEW-Instance V3, LCom / Kauf / Marketing / AD;

Here is the creation of an object. Comment. We continue to search and find in lines 433, 435, 466, 468, 738, 740, 800 and 802 appeals to methods of class AD. Comment. Look like that's it. We save. Now the package must be collected back and check its performance and availability of advertising. For the purity of the experiment, we return the remote from the AndroidManifest.xml string, collect the package, subscribe and install.

Our experimental rabbit. Seen advertising

Op-Pa! Advertising disappeared only during the application, but remained in the main menu that we see when we run soft. So, wait, but after all, the entry point is the MainActivity class, and the advertisement disappeared during the application, but remained in the main menu, then the entry point is different? To reveal the true entry point, open the AndroidManifest.xml file. And yes, it has the following lines:

They tell us (and, more importantly, android) that activity with the name START must be running in response to the generation of the intent (events) Android.Intent.action.Main from the category Android.intent.category.launcher. This event is generated when tapped on the application icon in the Lancher, so it determines the entry point, namely the Start class. Most likely, the programmer first wrote the application without a major menu, the entry point to which was the standard MainActivity class, and then added a new window (activity) containing the menu and described in the Start class, and manually made it input point.

Open the START.SMALI file and again looking for the AD string, we find in line 153 and 155 mention of the FIRSTAD class. He also has in the source and, judging by the name, is just responsible for displaying ads on the main screen. We look further, there is an instance of an instance of the FIRSTAD class and the intent, according to the context of having a relation to this instance, and then the Cond_10 label, the conditional transition to which the accuracy is carried out before creating an instance of the class:

IF-NE P1, V0,: COND_10 .Line 74 NEW-Instance V0, Landroid / Content / Intent; ...: Cond_10

Most likely, the program is somehow randomly calculates whether to show advertising on the main screen, and, if not, jumps immediately to Cond_10. OK, we simply simplify the task and replace the conditional transition to the unconditional:

# If-ne P1, V0 ,: Cond_10 Goto: Cond_10

There are no more FIRSTAD references in the code, so we close the file and again collect our virtual torch using APKTOOL. Copy on your smartphone, install, run. Voila, all advertising disappeared, with which we congratulate all.

RESULTS

This article is only a brief introduction to the methods of opening and modifying Android applications. For the scenes, many questions remained, such as removing protection, analysis of the obfused code, translation and replacing application resources, as well as the modification of applications written using Android NDK. However, having basic knowledge, understand all this - only the question of time.