java - android 4.0/4.1.2 下载问题

Question

我在使用 android 4.0 或更高版本时遇到问题，我正在尝试从 URL 下载文件，它在 android Galaxy Y 2.3/2.2 中运行良好，但当我对 Galaxy S3 (4.1. 2) 下载开始但没有完成。

代码:

 public void update() {
    Log.d(TAG, "Método para fazer a atualização iniciado.");
    try {
        Log.d(TAG, "Conectando com a internet...");
        URL url = new URL(
                url);
        HttpURLConnection c = (HttpURLConnection) url.openConnection();
        c.setRequestMethod("GET");
        c.setDoOutput(true);
        c.connect();

        Log.d(TAG, "Iniciando arquivo...");
        String PATH = Environment.getExternalStorageDirectory()
                + "/test/Update/";
        File file = new File(PATH);
        file.mkdirs();
        File outputFile = new File(file, "test.apk");
        FileOutputStream fos = new FileOutputStream(outputFile);

        Log.d(TAG, "Iniciando Stream...");
        InputStream is = c.getInputStream();

        Log.d(TAG, "Iniciando o download...");
        byte[] buffer = new byte[1024];
        int len1 = 0;
        while ((len1 = is.read(buffer)) != -1) {
            fos.write(buffer, 0, len1);
        }
        fos.close();
        is.close();

        Log.d(TAG, "Iniciando instalador...");
        final Intent promptInstall = new Intent(Intent.ACTION_VIEW);
        promptInstall.setDataAndType(Uri.fromFile(new File(PATH + "test.apk")),"application/vnd.android.package-archive");
        promptInstall.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(promptInstall);
        Log.d(TAG, "Instalador iniciado com sucesso!");
    } catch (MalformedURLException e) {
        Log.e(TAG, "Malformed URL. Mensagem: " + e.getMessage()
                + " Causa: " + e.getCause());
    } catch (IOException e) {
        Log.e(TAG, "IOException. Mensagem: " + e.getMessage() + " Causa: "
                + e.getCause());
    } catch (Exception e) {
        Log.e(TAG, "Exception. Mensagem: " + e.getMessage() + " Causa: "
                + e.getCause());
    }
}

Obs:没有错误，它只是开始下载并停止它。文件大小:126,188 字节，在 Galaxy S3 中为 6,403 字节

Answer 1

使用AsyncTask提出您的要求。

AsyncTask enables proper and easy use of the UI thread. This class allows to perform background operations and publish results on the UI thread without having to manipulate threads and/or handlers.