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android-tasks's Introduction

android-tasks

Neste aplicativo mostro como criar um Helper para carregar uma janela do tipo ProgressDialog e realizar a troca de mensagens entre a janela e a Activity que a gerencia. Também veremos como criar tarefas assíncronas para gerenciar o download de imagens que por sua vez serão baixadas para a área de Storage do seu dispositivo.

Helper para baixar arquivos

public static DownloadTask downloadAssync(Context context, String sourceFileName, String destFileName){ final DownloadTask downloadTask = new DownloadTask(context, sourceFileName, destFileName); downloadTask.execute(); return downloadTask; }

Helper para persistir os dados no dispostivo

public static File CreateFile(String fileName) { File dir = Environment.getExternalStorageDirectory(); File file = new File(dir, fileName); try { file.createNewFile(); } catch (IOException e) { file = null; } return file; }

Carregando a janela de progresso

progress = new Progress(MainActivity.this); progress.show("Baixando arquivo", "nome do arquivo.jpg");

Sendo notificado se o usuário cancelar o download

public interface IProgressEvent { void onCancel(DialogInterface dialog); }

public void onCancel(DialogInterface dialog) { Toast.makeText(this, "Download cancelado", Toast.LENGTH_LONG).show(); }

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