How to Check If an App Is a Non-System App in Android

How do I check if an app is a non-system app in Android?

Well, it's a sloppy solution in my opinion (what if /data/app isn't the apps directory on all devices?), but after a thorough search, this is what I have come up with:

for (ApplicationInfo ai : appInfo) {
    if (ai.sourceDir.startsWith("/data/app/")) {
        //Non-system app
    }
    else {
        //System app
    }
}

How to get the list of all non system apps in android

If an Application is a non-system application it must have a launch Intent by which it can be launched. If the launch intent is null then its a system App.

Example of System Apps: "com.android.browser.provider", "com.google.android.voicesearch".

For the above apps you will get NULL when you query for launch Intent.

PackageManager pm = getPackageManager();
List<ApplicationInfo> packages = pm.getInstalledApplications(PackageManager.GET_META_DATA);
for(ApplicationInfo packageInfo:packages){
    if( pm.getLaunchIntentForPackage(packageInfo.packageName) != null ){
                String currAppName = pm.getApplicationLabel(packageInfo).toString();
               //This app is a non-system app
    }
    else{
        //System App
    }
}

How can I dynamically detect whether my application is system or normal?

You could try using the flags available in the ApplicationInfo class (android.conent.pm). For example:

...
PackageManager pm = getPackageManager();
List<ApplicationInfo> installedApps = pm.getInstalledApplications(0);

for (ApplicationInfo ai: installedApps) {

    if ((ai.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
        // System app - do something here
        ...
    } else {
        // User installed app?
    }
}

Check if app belongs to system apps or to apps signed with platform key

Actually, ApplicationInfo.FLAG_SYSTEM and ApplicationInfo.FLAG_UPDATED_SYSTEM_APP flags do work, but they were tested against the wrong flags. Here is the correct code:

val applicationInfo = packageManager.getApplicationInfo(packageName, 0)
val isSystem =
                (applicationInfo.flags and ApplicationInfo.FLAG_SYSTEM != 0) ||
                (applicationInfo.flags and ApplicationInfo.FLAG_UPDATED_SYSTEM_APP != 0)

android get only user install app not system apps

Just use this:

List<ApplicationInfo> apps = getPackageManager().getInstalledApplications(0);
for(ApplicationInfo app : apps) {
    if((app.flags & (ApplicationInfo.FLAG_UPDATED_SYSTEM_APP | ApplicationInfo.FLAG_SYSTEM)) > 0) {
        // It is a system app
    } else {
        // It is installed by the user
    }
}

You can make a separate array and then add user installed apps in this form the else statement. Such as:

else {
        // It is installed by the user
        UserAppArray<ApplicationInfo>.add(app);
    }

How to check programmatically if an application is installed or not in Android?

Try with this:

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Add respective layout
        setContentView(R.layout.main_activity);

        // Use package name which we want to check
        boolean isAppInstalled = appInstalledOrNot("com.check.application");  
        
        if(isAppInstalled) {
            //This intent will help you to launch if the package is already installed
            Intent LaunchIntent = getPackageManager()
                .getLaunchIntentForPackage("com.check.application");
            startActivity(LaunchIntent);
                    
            Log.i("SampleLog", "Application is already installed.");          
        } else {
            // Do whatever we want to do if application not installed
            // For example, Redirect to play store

            Log.i("SampleLog", "Application is not currently installed.");
        }
    }

    private boolean appInstalledOrNot(String uri) {
        PackageManager pm = getPackageManager();
        try {
            pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
            return true;
        } catch (PackageManager.NameNotFoundException e) {
        }

        return false;
    }

}

How can I get a list of apps installed, but not including system apps?

Hi you can use the code below

 for(ApplicationInfo app : apps) {
        //checks for flags; if flagged, check if updated system app
        if((app.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) == 1) {
            installedApps.add(app);
        //it's a system app, not interested
        } else if ((app.flags & ApplicationInfo.FLAG_SYSTEM) == 1) {
            //Discard this one
        //in this case, it should be a user-installed app
        } else {
            installedApps.add(app);
        }
    }