In Android, how do I get the application's id programatically (or by some other method), and how can I communicate with other applications using that id?
13 Answers
i'm not sure what "application id" you are referring to, but for a unique identifier of your application you can use:
getApplication().getPackageName() method from your current activity
For getting AppId (or package name, how some says), just call this:
But be sure that you importing BuildConfig with your app id packages path
BuildConfig.APPLICATION_ID
Package name is your android app id .
String appId = BuildConfig.APPLICATION_ID
Or
https://play.google.com/store/apps/details?id=com.whatsapp
App Id = com.whatsapp
Step 1: Open the Google Play Store
Step 2: Open any App in App Store Example: facebook
Step 3: Click on any App and Look at the Browser link and At the End id=com.facebook.katana&hl=en will be there and this is your Apps Unique Id.
The PackageInfo.sharedUserId field will show the user Id assigned in the manifest.
If you want two applications to have the same userId, so they can see each other's data and run in the same process, then assign them the same userId in the manifest:
android:sharedUserId="string"
The two packages with the same sharedUserId need to have the same signature too.
I would also recommend reading here for a nudge in the right direction.
Android App ES File Explorer shows the Android package name in the User Apps section which is useful for Bitwarden. Bitwarden refers to this as "android application package ID (or package name)".
To track installations, you could for example use a UUID as an identifier, and simply create a new one the first time an app runs after installation. Here is a sketch of a class named “Installation” with one static method Installation.id(Context context). You could imagine writing more installation-specific data into the INSTALLATION file.
public class Installation {
private static String sID = null;
private static final String INSTALLATION = "INSTALLATION";
public synchronized static String id(Context context) {
if (sID == null) {
File installation = new File(context.getFilesDir(), INSTALLATION);
try {
if (!installation.exists())
writeInstallationFile(installation);
sID = readInstallationFile(installation);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
return sID;
}
private static String readInstallationFile(File installation) throws IOException {
RandomAccessFile f = new RandomAccessFile(installation, "r");
byte[] bytes = new byte[(int) f.length()];
f.readFully(bytes);
f.close();
return new String(bytes);
}
private static void writeInstallationFile(File installation) throws IOException {
FileOutputStream out = new FileOutputStream(installation);
String id = UUID.randomUUID().toString();
out.write(id.getBytes());
out.close();
}
}
Yon can see more at https://github.com/MShoaibAkram/Android-Unique-Application-ID
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