我在recyclelerView中从服务器加载图像,并且我也在下载该图像。我真正想做的是直到图像下载直到那时显示图像的模糊或暗不透明预览与进度条。加载图像我使用滑动和下载我使用Okhttp
要将图像加载到视图中: -
Glide.with(cont).load(modal.get(position).getMassege()).apply(requestOptions).listener(new RequestListener<Drawable>() {
@Override
public boolean onLoadFailed(@Nullable GlideException e, Object model, com.bumptech.glide.request.target.Target<Drawable> target, boolean isFirstResource) {
return false;
}
@Override
public boolean onResourceReady(Drawable resource, Object model, com.bumptech.glide.request.target.Target<Drawable> target, DataSource dataSource, boolean isFirstResource) {
if(modal.get(position).getProgressPercentage()==0) {
new Thread(new Runnable() {
@Override
public void run() {
downloadFile(modal.get(position).getMassege(), position, modal.get(position).getMsgid(),modal.get(position).getTimeSent());
}
}).start();
}
return false;
}
}).into(holder.image);
下载图片
public void downloadFile(String src, int position, String messageId,String timeStamp) {
try {
java.net.URL url = new java.net.URL(src);
HttpURLConnection connection = (HttpURLConnection) url
.openConnection();
connection.setDoInput(true);
connection.connect();
int lenghtOfFile = connection.getContentLength();
InputStream input = connection.getInputStream();
String[] fileNam = src.split("/");
OutputStream output = new FileOutputStream(cont.getFilesDir() + fileNam[fileNam.length - 1]);
byte data[] = new byte[1024];
long total = 0;
int count = 0;
int progressPercentage = 0;
Intent intent = new Intent();
intent.setAction(Constants.INTENT_FILTER);
intent.putExtra(Constants.MESSAGE_POSITION_IN_CHAT_LIST, position);
intent.putExtra(Constants.DOWNLOADING_FILE, true);
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
// After this onProgressUpdate will be called
progressPercentage = (int) ((total * 100) / lenghtOfFile);
if(progressPercentage==30||progressPercentage==60||progressPercentage==100) {
intent.putExtra(Constants.PROGRESS, progressPercentage);
intent.putExtra(Constants.FILE_PATH, cont.getFilesDir() + fileNam[fileNam.length - 1]);
intent.putExtra(Constants.MESSAGE_ID, messageId);
cont.sendBroadcast(intent);
}
// writing data to file
output.write(data, 0, count);
Log.d("Downloding" + progressPercentage, "Count" + count);
if (progressPercentage > 99) {
DatabaseHelperChattingToUsers databaseHelperChattingToUsers = new DatabaseHelperChattingToUsers(cont);
String userId = databaseHelperChattingToUsers.getUserExists(sendTo);
String splits[] = userId.split("/");
databaseHelperChattingToUsers.updateContact(new ChattingToUsers(splits[0], sendTo, timeStamp, cont.getFilesDir() + fileNam[fileNam.length - 1],"0"));
DatabaseHelper1 db = new DatabaseHelper1(cont);
db.updateContact(messageId, "", "", "", 100);
String filePath = intent.getStringExtra(Constants.FILE_PATH);
db.updateChatMessage(messageId, filePath);
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
我到达的地方:
我可以在recyclelerView中加载图像的同时并行下载图像,同时显示带有图像模糊预览的图像下载的进度条。
我面临的问题:
在recyclelerView中加载图像时需要花费很少的时间来进行图像的模糊预览,但是物品视图会在recyclelerView中添加,并且图像会在某个时间后加载
Glide会为你下载图片,你为什么要通过okHttp
下载它来付出额外的努力?
下载完整图像总会有延迟。这取决于您的网络速度和图像大小。
要减少延迟,您可以在服务器上存储不同大小的图像。在客户端,首先下载小尺寸图像并在recyclerview中显示。 (图像尺寸越小==下载时间越短。)
在recyclelerview中单击行时,通过点击另一个URL来下载完整的图像。
EG
https://www.example.com/images/small/image1.png(250x250 px = 100kb)
https://www.example.com/images/medium/image1.png(1000x1000 px = 400kb)
https://www.example.com/images/large/image1.png(3000x3000牛= 1200kb)