Jak przenieść obraz z adresu URL na kartę SD?

Question

Jak przenieść obraz z adresu URL na kartę SD?

Jak Mogę zapisać obraz na karcie SD, którą pobieram z adresu URL obrazu?

23

android image download android-sdcard

Author: Jeff Axelrod, 2010-07-21

Source

2 answers

Doskonały przykład można znaleźć w Ostatni post na blogu dewelopera Androida:

static Bitmap downloadBitmap(String url) {
    final AndroidHttpClient client = AndroidHttpClient.newInstance("Android");
    final HttpGet getRequest = new HttpGet(url);

    try {
        HttpResponse response = client.execute(getRequest);
        final int statusCode = response.getStatusLine().getStatusCode();
        if (statusCode != HttpStatus.SC_OK) { 
            Log.w("ImageDownloader", "Error " + statusCode + 
               " while retrieving bitmap from " + url); 
            return null;
        }

        final HttpEntity entity = response.getEntity();
        if (entity != null) {
            InputStream inputStream = null;
            try {
                inputStream = entity.getContent(); 
                final Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
                return bitmap;
            } finally {
                if (inputStream != null) {
                    inputStream.close();  
                }
                entity.consumeContent();
            }
        }
    } catch (Exception e) {
        // Could provide a more explicit error message for IOException or
        // IllegalStateException
        getRequest.abort();
        Log.w("ImageDownloader", "Error while retrieving bitmap from " + url,
           e.toString());
    } finally {
        if (client != null) {
            client.close();
        }
    }
    return null;
}

8

Author: ognian,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2012-08-09 20:25:21

score 46 · Accepted Answer

Najpierw musisz upewnić się, że aplikacja ma uprawnienia do zapisu na karcie SD. Aby to zrobić, musisz dodać uprawnienia uses write external storage w pliku manifest aplikacji. Zobacz Ustawianie Uprawnień Androida

Następnie możesz pobrać adres URL do pliku na karcie SD. Prosty sposób to:

URL url = new URL ("file://some/path/anImage.png");
InputStream input = url.openStream();
try {
    //The sdcard directory e.g. '/sdcard' can be used directly, or 
    //more safely abstracted with getExternalStorageDirectory()
    File storagePath = Environment.getExternalStorageDirectory();
    OutputStream output = new FileOutputStream (new File(storagePath,"myImage.png"));
    try {
        byte[] buffer = new byte[aReasonableSize];
        int bytesRead = 0;
        while ((bytesRead = input.read(buffer, 0, buffer.length)) >= 0) {
            output.write(buffer, 0, bytesRead);
        }
    } finally {
        output.close();
    }
} finally {
    input.close();
}

EDIT: Put permission in manifest

 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />