[app] 根据包名获取应用名

public CharSequence getApplicationLabel(Context context, String pkgName){
    try {
        PackageManager pm = context.getPackageManager();
        ApplicationInfo appInfo = pm.getApplicationInfo(pkgName, PackageManager.GET_META_DATA);
        return pm.getApplicationLabel(appInfo);
    }
    catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
        return null;
    }
}