Question

我有一些图片网址，我想下载这些图片并在android中设置为我的imageView。我正在使用以下代码。它只是在执行任务。但这个过程在我看来太慢了。我知道这取决于我的设备中的互联网连接速度，但是还有更快的方法来加速加载图像吗？

import java.io.InputStream;
import java.lang.ref.WeakReference;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpGet;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.http.AndroidHttpClient;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.ImageView;

class ImageDownloaderTask extends AsyncTask<String, Void, Bitmap> {
        private final WeakReference<ImageView> imageViewReference;

        public ImageDownloaderTask(ImageView imageView) {
                imageViewReference = new WeakReference<ImageView>(imageView);
        }

        @Override
        // Actual download method, run in the task thread
        protected Bitmap doInBackground(String... params) {
                // params comes from the execute() call: params[0] is the url.
                return downloadBitmap(params[0]);
        }

        @Override
        // Once the image is downloaded, associates it to the imageView
        protected void onPostExecute(Bitmap bitmap) {
                if (isCancelled()) {
                        bitmap = null;
                }

                if (imageViewReference != null) {
                        ImageView imageView = imageViewReference.get();
                        if (imageView != null) {

                                if (bitmap != null) {
                                        imageView.setImageBitmap(bitmap);
                                } else {
                                        imageView.setImageDrawable(imageView.getContext().getResources()
                                                        .getDrawable(R.drawable.imgloading));
                                }
                        }

                }
        }

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

}

等待任何提示或源代码只执行相同的任务但速度更快。感谢名单

Answer 1

您可以使用缓存。我正在使用Square的Picasso从网上加载图像并在ImageView中显示它们。 Picasso有几个缓存实现，非常简单易用。

https://github.com/square/picasso

Answer 2

也许这不是最好和最干净的方式，但在我看来，根据我的经验，它是紧张的。

我喜欢使用WebView来加载图片，并且当你拥有很多图片时效果很好而且它很简单：

image.setBackgroundColor(0);
image.loadDataWithBaseURL("", "<img src='YOUR URL HERE'/>", 
                          "text/html", "UTF-8", "");

图像是WebView：

WebView image = (WebView) findViewById(R.id.imagewebview);

在android中下载图片给出url更快

2 个答案: