How can I get package name in android?

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 context. I only want to get packagename in my class which will be used in and开发者_如何转开发roid app. So how can I do this? Thank you!

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Use : getPackageManager().getPackageInfo(getPackageName(), 0).packageName Or just MyContext.getPackageName()

You can also create a function:

public String getPackageName(Context context) {
    return context.getPackageName();
}

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The following constant is available without the need for a context.

BuildConfig.APPLICATION_ID

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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();

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getApplicationContext().getPackageName() will give the package name.

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List<ApplicationInfo> packages;
    PackageManager pm;
    pm = getPackageManager();
             get a list of installed apps.
            packages = pm.getInstalledApplications(0);

ActivityManager mActivityManager = (ActivityManager) context
                .getSystemService(Context.ACTIVITY_SERVICE);

   for (ApplicationInfo packageInfo : packages) {
   //packageInfo.packageName contains package name


                      }

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you can create a Util Class this way:

public class AppInfo{
  private static Context cxt;
  public static String PACKAGE_INFO;
  public static String init(Context context){
    cxt = context;
    PACKAGE_INFO = cxt.getPackageName();
  }
}

then you can use it this way

public class MyActivity extends Activity{
  @Override
  public void onCreate(Bundle bundle){
    ...
    AppInfo.init(getApplicationContext());
    ...
  }
}

then you can call it this way:

public class someClass{
  public void someMethod(){
    String packageInfo = AppInfo.PACKAGE_INFO;
    //Do what you wish
  }
}

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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?

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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;
    }
}

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I think getPackageName() is available directly within activity without calling getApplicationContext. Checked it myself.Working good.