Run native executable in Android App
Run native executable in Android App
Demo †
Here's demo application called "Run Native Exe" to:
- run local UNIX commands
- run native executable downloaded from the Web
Package: NativeExe-0.2.apk
Source code: on Github (ADT project)
To install the package,
- Go to Settings→Application and check "Unknown sources"
- Open the package link above using Android Browser
or type "adb install NativeExe-*.apk" in your PC if you have Android SDK.
How can I run UNIX commands in Android App? †
You can use Runtime.exec() in standard Java. Here's sample code to run /system/bin/ls /sdcard in Android App:
try {
// Executes the command.
Process process = Runtime.getRuntime().exec("/system/bin/ls /sdcard"); // Reads stdout.
// NOTE: You can write to stdin of the command using
// process.getOutputStream().
BufferedReader reader = new BufferedReader(
new InputStreamReader(process.getInputStream()));
int read;
char[] buffer = new char[4096];
StringBuffer output = new StringBuffer();
while ((read = reader.read(buffer)) > 0) {
output.append(buffer, 0, read);
}
reader.close(); // Waits for the command to finish.
process.waitFor(); return output.toString();
} catch (IOException e) {
throw new RuntimeException(e);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
This code is based on this article. Thanks yussi to let me know this by comment.
OK, but how can I put my own native executable in Android App? †
First, you need to cross-compile your native executable for ARM.
Here's a way (dynamic link version). Or you can use Scratchbox (Japanese).
If you get a file with a format like this, it's probably OK:
% file yourapp
yourapp: ELF -bit LSB executable, ARM, version (SYSV), for GNU/Linux 2.6., statically linked, not stripped
You have three ways to put the binary to the phone:
- From Android Java app, using assets folder (by fnerg in comment below)
- Include the binary in the assets folder.
- Use getAssets().open("YourBinaryHere") to get an InputStream.
- Write it to /data/data/app-package-name (e.g. /data/data/net.gimite.nativeexe), where your application has access to write files and make it executable.
- Run "/system/bin/chmod 744 /data/data/app-package-name/yourapp" using the code above.
- Run your executable using the code above.
- From Android Java app, downloading via HTTP (which I use in my demo application above)
- Dowload the executable using HTTP and put it to /data/data/app-package-name (e.g. /data/data/net.gimite.nativeexe), where your application has access to write files and make it executable. You can use standard Java FileOutputStream to write files there.
- Run "/system/bin/chmod 744 /data/data/app-package-name/yourapp" using the code above.
- Run your executable using the code above.
- By adb (needs SDK and root)
- If you want to put the executable to YOUR phone connected with adb command in Android SDK and you have root, you can put the executable by:
% adb shell
$ su
# mkdir /data/tmp
# chmod /data/tmp
# exit
$ exit
% adb push yourapp /data/tmp
% adb shell
$ chmod /data/tmp/yourapp
$ /data/tmp/yourapp
Note that you cannot make files executable in /sdcard.
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