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extension URLSession {

    
    func handleTaskOrCache(with request: URLRequest, completionHandler: @escaping (Data?, URLResponse?, Error?) -> Void) {
        
        let cachedDataForRequest = fetchCachedResponse(request: request)
        
        guard let dateCache = dateFromResponse(cachedResponse: cachedDataForRequest) else {
            handleDataTask(request: request, completionHandler: completionHandler)
            return

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func formatResponseHeaderDate() -> Date?{
        let dateFormatter = DateFormatter()
        dateFormatter.locale = Locale(identifier: "en_US_POSIX") // set locale to reliable US_POSIX
        dateFormatter.dateFormat = "EEE,d MMM yyyy HH:mm:ss zzz"
        dateFormatter.timeZone = TimeZone(abbreviation: "GMT")
        return dateFormatter.date(from: self)
    }

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private func dateFromResponse(cachedResponse: CachedURLResponse?) -> Date?{
       return  (cachedResponse?.response as? HTTPURLResponse)?.value(forHTTPHeaderField: "Date")?.formatResponseHeaderDate()
    }

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lazy var session: URLSession = {
               
        let configuration = URLSessionConfiguration.default
        configuration.requestCachePolicy = .returnCacheDataElseLoad
        return URLSession(configuration: configuration)
        
    }()

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Future _showMyDialog(BuildContext context) async {
    return showCupertinoDialog(
      context: context,
      builder: (_) => _buildAlertDialog(),
    );
  }

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Future _showMyDialog(BuildContext context) async {
    return showDialog(
      context: context,
      builder: (_) => _buildAlertDialog(),
    );
  }

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Widget _buildCupertinoAlertDialog() {
    return CupertinoAlertDialog(
      title: Text('Notificaciones'),
      content:
          Text("¿Desea recibir notificaciones? Serán muy pocas de verdad :)"),
      actions: [
        FlatButton(
            child: Text("Aceptar"),
            textColor: Colors.blue,
            onPressed: () {

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Widget _buildAlertDialog() {
    return AlertDialog(
      title: Text('Notificaciones'),
      content:
          Text("¿Desea recibir notificaciones? Serán muy pocas de verdad :)"),
      actions: [
        FlatButton(
            child: Text("Aceptar"),
            textColor: Colors.blue,
            onPressed: () {

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private void savedBitmapFromViewToFile(){
  //inflate layout
  View layout = LayoutInflater.from(this).inflate(R.layout.activity_main, null, false);
  RelativeLayout mContImage = (RelativeLayout) layout.findViewById(R.id.image_cont);
  
  //reference View with image
  mContImage.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
  Bitmap bitmap = Bitmap.createBitmap(mContImage.getMeasuredWidth(), mContImage.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
  Canvas canvas = new Canvas(bitmap);
  mContImage.layout(0, 0, mContImage.getMeasuredWidth(), mContImage.getMeasuredHeight());

antocara

public class CustomView extends View implements ValueAnimator.AnimatorUpdateListener {

    private Paint paint;
    private Path path;
    private int angleFinal = 360;
    private RectF rect;



    public CustomView(Context context) {