Android 如何调整通过URL检索的图像的大小并保存它？

我从互联网上通过URL获取一张图片，并试图在保存之前调整其大小（到较小的大小）。我设法保存了它，但无法调整大小。我怎么能这么做？代码如下：

URL url = new URL(LogoURL);

InputStream input = url.openStream();
try {
    OutputStream output = new FileOutputStream("data/data/com.android.mylogo/logo.jpg");
    try {
        //byte[] buffer = new byte[aReasonableSize];     
        int bytesRead = 0;
        System.out.println("Buffer Length is \t:-" + buffer.length);
        while ((bytesRead = input.read(buffer, 0, buffer.length)) >= 0) {
            System.out.println("inside while");
            output.write(buffer, 0, bytesRead);
        }
    } finally {
        output.close();
        System.out.println("saved image");
    }
} finally {
    input.close();
}

---

JPG无论如何都是压缩的，所以没有必要进一步压缩它们。

---

一般来说，要压缩某些内容，请查看软件包的类。

如果要将图像缩小到特定尺寸，可以使用以下代码：

HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(LogoURL);

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

    HttpEntity entity = response.getEntity();
    if (entity != null) {

        InputStream is = null;
        BufferedInputStream bis = null;
        try {
            is = url.openStream();
            bis = new BufferedInputStream(is);

            int sampleSize = 1;

            bis.mark(Integer.MAX_VALUE);

            Options bounds = new Options();
            bounds.inJustDecodeBounds = true;
            BitmapFactory.decodeStream(bis, null, bounds);
            if (bounds.outWidth != -1) {
                int width = bounds.outWidth;
                int height = bounds.outHeight;
                boolean withinBounds = width <= YOUR_DESIRED_WIDTH && height <= YOUR_DESIRED_HEIGHT;

                int newWidth = width;
                int newHeight = height;
                while (!withinBounds) {
                    newWidth /= 2;
                    newHeight /= 2;
                    sampleSize *= 2;
                    withinBounds = newWidth <= YOUR_DESIRED_WIDTH && newHeight <= YOUR_DESIRED_HEIGHT;
                }
            } else {
                Log.w(LOG_TAG, "Can't open bitmap at " + url);
                return null;
            }

            try {
                bis.reset();
            } catch (IOException e) {
                if(is != null){
                    is.close();
                }

                if(bis != null){
                    bis.close();
                }

                if(!entity.isRepeatable()){
                    entity.consumeContent();
                    response = client.execute(request);
                    entity = response.getEntity();
                }

                is = entity.getContent();
                bis = new BufferedInputStream(is);
            }

            Options opts = new Options();
            opts.inSampleSize = sampleSize;
            Bitmap bm = BitmapFactory.decodeStream(bis, null, opts);

            return bm;
        } finally {
            if (is != null) {
                is.close();
            }               

            if (bis != null) {
                bis.close();
            }

            entity.consumeContent();
        }
    }
} catch (IOException e) {
    request.abort();
    Log.w(LOG_TAG, "I/O error while retrieving bitmap from " + url, e);
} catch (IllegalStateException e) {
    request.abort();
    Log.w(LOG_TAG, "Incorrect URL: " + url);
} catch (Exception e) {
    request.abort();
    Log.w(LOG_TAG, "Error while retrieving bitmap from " + url, e);
}

HttpClient=newdefaulthttpclient（）；
HttpGet请求=新的HttpGet（LogoURL）；
试一试{
HttpResponse response=client.execute（请求）；
final int statusCode=response.getStatusLine（）.getStatusCode（）；
if（statusCode！=HttpStatus.SC\u OK）{
Log.w（从“+url”检索位图时，日志标签“错误”+statusCode+”；
返回null；
}
HttpEntity=response.getEntity（）；
如果（实体！=null）{
InputStream=null；
BufferedInputStream bis=null；
试一试{
is=url.openStream（）；
bis=新的BufferedInputStream（is）；
int sampleSize=1；
双标记（整数最大值）；
选项边界=新选项（）；
bounds.InjustDecodeBunds=true；
解码流（bis，null，bounds）；
if（bounds.outWidth！=-1）{
int width=bounds.outWidth；
int height=bounds.outHeight；
boolean withinBounds=width Compress表示什么类型的压缩？在大小上，或者您希望使用类将其压缩。您可以这样做。@onkar我更新了您的问题。。请检查这是否是您想要的。通常，您必须非常具体地说明您在这里提出的问题：）但您在SD卡更新中保存图像的位置非常重要为其他人服务