Which launcher is running?

Usually there is one launcher on an Android device. But sometimes users install a few while only one of them is active.

How can I check which launcher is currently activ开发者_如何学Goe on my Android device?

Thanks.

The home screen is started with the Intent ACTION_MAIN with category CATEGORY_HOME (from the javadoc for Intent). Use a ResolveInfo to this intent to know what application will start.

This will give you the default Home application:

final Intent intent = new Intent(Intent.ACTION_MAIN); 
intent.addCategory(Intent.CATEGORY_HOME); 
final ResolveInfo res = getPackageManager().resolveActivity(intent, 0); 
if (res.activityInfo == null) {
    // should not happen. A home is always installed, isn't it?
} else if ("android".equals(res.activityInfo.packageName)) {
    // No default selected     
} else {
     // res.activityInfo.packageName and res.activityInfo.name gives you the default app
} 

Now, if you want to know which one is running, it will take more time, because ActivityManager is slow:

// instead of the best, query all activities that match:
final List<ResolveInfo> list = ((PackageManager)getPackageManager()).queryIntentActivities(intent, 0);
// TODO from there, use ActivityManager to know which one is running and is in the list

private String findLauncherPackageName(){       
    final Intent intent = new Intent(Intent.ACTION_MAIN); 
    intent.addCategory(Intent.CATEGORY_HOME); 
    final ResolveInfo res = getPackageManager().resolveActivity(intent, 0); 
    Log.e("ANDRO_ASYNC", String.format("findLauncherPackageName()%s",res.activityInfo.packageName));
    return res.activityInfo.packageName;
}

you can check the title of active launcher only if it is marked default. otherwwise you will get result like

com.android.internal.app.ResolverActivity

To improve upon previous answers, here is a self contained helper class you can use:

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;

public class LauncherFinder {

    /**
     * Checks to see if the App currently set as the system launcher
     * matches the given package name.
     *
     * @param context
     * @param packageName
     * @return
     */
    public static boolean isPackageSetAsLauncher(Context context, String packageName) {
        String launcherPackageName = getLauncherPackageName(context);
        return packageName.equals(launcherPackageName);
    }

    /**
     * Get the package name of the app currently set as the system launcher
     * @param context
     * @return
     */
    public static String getLauncherPackageName(Context context) {
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_HOME);

        final PackageManager packageManager = context.getPackageManager();

        ResolveInfo result = packageManager.resolveActivity(intent, 0);

        if (result != null && result.activityInfo != null) {
            return result.activityInfo.packageName;
        }

        return null;
    }
}

and then use it like so:

boolean isLauncher = LauncherFinder.isPackageSetAsLauncher(getApplicationContext(), "com.package.name");

This will return true if com.package.name is currently set as the default launcher.