I want to decompile an apk to its correct form of source code where we can edit that code and can open in android studio as a project
I tried using Apk tool and other but not useful
Fully decompiling an Android APK so that you can modify it and then recompile is next to impossible. This is only realistic for very small Android apps that don't use complex code and libraries.
Jadx can decompile APK files to a gradle project which you can open in Android Studio but common apps are so large and complex that always a number of methods can not be decompiled or the decompiled code is not exactly matching the DEX byte code. So it can be used to decompile a project you have lost the source code of to recover code certain important parts and then copy these part into a new Android Studio project.
If you want to modify the code of an existing APK file the only working way is o use apktool. Note that apktool decompiles the app to smali code which is something like Android dex assembler code. It is pretty hard to read and modifying it requires a lot of knowledge on smali code and how Java/DEX work internally. But using apktool for decompiling and recompiling grants the highest chance that your recompiled app really works in the end.
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I downloaded the cocos3.14.1 in the cocos2dx official website, and then use the online method to create a project structure, and then compiled out android
Studio version of "proj.android-studio", and finally with the android studio to the success of this project can also be run. But then how do I develop it? Map, event, interface, logic how to write?
After importing there will be an activty inheritance Cocos2dxActivity, and a package "org.cocos2dx.lib". But I do not know what to do
You have to write most of the game logic in C++ and keep your class files in "Classes" directory.
You would have to update the android project include these C++ files.
If you're using a mac, it is easier to develop it in Xcode, and build it for android in the last step. That way you can debug all the game logic in Xcode and simulator quickly.
In the project that is initially created, your game logic starts in the AppDelegate file (by setting things like the design resolution etc), and the first scene is the "HelloWorld" scene.
Since you're new to this, why not just purchase a book and get started, or read any of the many tutorials available online.
There are answers about getting the tess-two project integrated into an Android project within Android Studio, but many are out-dated and none used the current capabilities defined here:
Using Android Studio 2.2 and higher, you can use the NDK to compile C and C++ code into a native library and package it into your APK using Gradle, the IDE's integrated build system. Your Java code can then call functions in your native library through the Java Native Interface (JNI)
What specific steps would be required to make tess-two functionality a part of the resulting APK, using functionality within Android Studio, rather than external file placement, manipulation and command line tools? So taking the building, creation of *.so files into the IDE. Specifically using just Android Studio's integrated build system (Gradle) as described here.
1. Start a new project
2. Import Tess-Two into the project
2b. Add any needed plug-ins
3. Add code in the main activity to get native functionality
4. Configure Android Studio build so that native functionality is available
This is where the specifics are required
4. Configure Android Studio build for native functionality
4a. Link C++ Project with Gradle
First, check the tess-two project for build files. You may select CMakeLists.txt or Android.mk files. Both are currently supported.
In this case, I used ndk-build, which seemed like a good bet for integrating the native code.
For more information, see Android Studio documentation
4b. Manage Long Commands
In Windows, errors may be encountered if the command length grows too large. To prevent problems, use LOCAL_SHORT_COMMANDS AND APP_SHORT_COMMANDS in the Android.mk file.
The "e=87" error is what you are avoiding by doing this:
For more on that topic, see stackoverflow question about error 87.
4c. Add Module Dependency for tess-two
In File > Project Structure > Dependencies use the + to add the tess-two dependency:
4d. Build the Project and check .apk file for .so files
The build, which takes a long time, should complete now. Validate that the .apk file contains the .so files, created during the build. With the tess-two libraries in an static initializer, run the project on your Android device:
The code completion is fine on Android Studio java project. But I want to use Android Studio to edit some existing C file(.cpp).
for example, if i have declared some function, then i type the function in other section. But the android studio doesn't show up the code suggestion or some debugging.
Can Android Studio support Code completion for C/C++ like this:?
Yes it does, as long as the project is setup to use the NDK and the C/CPP sources are included in the project.
Try pulling the ndk sample repo and try opening one of the projects.
If you have a java project and want to edit some arbitrary C or C++ source, then no. It does not have enough information about the source file, include paths, compiler etc...
If your project uses Android.mk to build, it will be a bug of Android Studio. I have been reported.
Android.mk project cannot show code completion for cpp.
It seems that old version of Android Studio does not support code completion of jni native build (with Android.mk as configuration file), and that should already be fixed now.
But if you are using CMake in your project as external building tool and code completion still does not work, It's probably because you have more than one version of cmake installed. You can try to remove extra ones from SDK manager and restart Android Studio, it should work.
To see installed CMake version, you can open the SDK manager and check the 'show package details' on the right bottom. You can view cmake tools installed with different versions.
In my particular case, I implemented a cross platform project in C++11 that uses CMake. I initially designed this project to work on PC (Windows, Unix), but now I realized that I can use it on mobile platforms too, without re-implementing the business logic on every platform. The project uses standard libraries: Boost, Poco, OpenSSL, Protobuf.
After a few searches I came to conclusion that this is not even an usual mode to put together native and managed code in Android.
Is it possible to add reference in a Gradle project in Android Studio to a native project that uses CMake?
Can NDK adopt the project in a simple manner if I compile everything in command line (assuming I don't use Android Studio)?
If it is possible, is it recommended at all?
Is it possible to add reference in a Gradle project in Android Studio to a native project that uses CMake?
Since Google announced Android Studio 2.2 that comes with cmake plugin, so it's possible to reference CMake project to android project.
Can NDK adopt the project in a simple manner if I compile everything in command line (assuming I don't use Android Studio)?
In my experience, i compile NDK in separate way and then link the static/shared library (.so file) to be used in android project. I used NDK while developing PDF Reader using mupdf here
Hope this helps.
it would be possible with android studio 2.2, mainly the android plugin for gradle makes it possible. you could look at some examples in:
https://github.com/googlesamples/android-ndk/tree/master-cmake
android studio directly reads-in your cmake scripts -- there is nothing like desktop systems that generate project files for their native IDEs ( Visual Studio or XCode ); so you might have to modify your existing cmake files to eventually make it to work for android studio.
as long as you build to the correct APK, command line or IDE does not matter too much. If you intend to ship source code, having your project ready with an IDE would be attractive.
Please see CMaker_Boost, build the Boost with the CMake at a configure time. Now it is tested on the Linux and Android, gcc and clang. This can be included to the gradle project in the Android Studio. I hope this helps.
I have got some open source projects which I want to have a try. But I want to use Eclipse if the project was made using eclipse; otherwise I would like to use Android Studio.
So how can I know by viewing the source code about the IDE used for the development of a particular project? Is there any metadata in any file which stores the IDE information?
I believe that Android Studio sometimes includes gradle related files. That's how I would check.