How can I get package name in android?

Question

I need to write some util class by myself and I need the packagename of android app. While I found the packageManager which only can be used in Activity and so on that has c

Answer 1

you can get the package name of installed app:

ArrayList<PackageInfo> res = new ArrayList<PackageInfo>();
        PackageManager pm = getApplicationContext().getPackageManager();
        List<PackageInfo> packs = pm.getInstalledPackages(0);

and if you want to find the package name of your app:

context.getPackageName();

Answer 2

I have seen the following two ways to get the package name starting from a Context variable:

context.getPackageManager().getPackageInfo(context.getPackageName(), 0).packageName

and

context.getPackageName()

Won't they always give the same answer? Is one way preferable to use over the other in certain circumstances?

Answer 3

Here add this to your util class. It makes sure to handle different “flavors” and debug/release builds, as other answers do not:

@Nullable
public static String getApplicationPackageName(@NonNull Context context)
{
    final PackageInfo packageInfo = getPackageInfo(context);
    if (packageInfo.applicationInfo == null)
    {
        return null;
    }
    // Returns the correct “java” package name that was defined in your
    // AndroidManifest.xml.
    return packageInfo.applicationInfo.packageName;
}

// Convenience method for getting the applications package info.
@NonNull
private static PackageInfo getPackageInfo(@NonNull final Context context)
{
    final PackageManager packageManager = context.getPackageManager();

    try
    {
        return packageManager.getPackageInfo(context.getPackageName(), 0);
    }
    catch (final PackageManager.NameNotFoundException ignored)
    {
        //noinspection ConstantConditions: packageInfo should always be available for the embedding app.
        return null;
    }
}