为什么NotificationManager在更新过程中工作如此缓慢?

问题描述

我通过NotificationManager发布文件上传进度，但是在更新进度时，UI冻结了.

I publish file upload progress via NotificationManager, but while updating its progress UI freezes.

我使用NotificationCompat.Builder，它缓存在class字段中.因此进度发布非常简单:

I use NotificationCompat.Builder, which cached in the class field. So progress publishing is a very simple:

manager.notify(id, uploader.
    setProgress(MAX_PROGRESS, (int) (progress * 100), false).
    build()
);

保证更新进度是从主线程(包装在Handler装饰器中)执行的.

Update progress is guaranteed to execute from the main thread(wrapped in Handler decorator).

this.request.setCallback(new UploaderDecorator(this.request.getCallback()));

最新进展如下:

long total = file.length();
long uploaded = 0;
int bytesRead = input.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
    output.write(buffer, 0, bufferSize);
    uploaded += bytesRead;
    callback.onUploadProgress(activeFile, ((float) uploaded / total));
    bytesRead = input.read(buffer, 0, bufferSize);
}

那为什么它这么慢?

推荐答案

这是常见的行为.您不应该将频繁的更新充斥到NotificationManager中.您应该确定一个更新间隔，例如每秒两次.

This is a common behavior. You shouldn't flood the NotificationManager with frequent updates. You should decide an interval to update, like twice every second.

例如，

long startTime;
long elapsedTime = 0L;

if (elapsedTime > 500) {
                    new Handler(Looper.getMainLooper()).post(new Runnable() {
                        @Override
                        public void run() {
                            mBuilder.setProgress(100, (int) newValue, false);
                            mNotifyManager.notify(notificationID, mBuilder.build());

                            startTime = System.currentTimeMillis();
                            elapsedTime = 0;
                        }
                    });

                    Log.d("Andrognito", newValue + "Progress");
                }
                else
                    elapsedTime = new Date().getTime() - startTime;

这对我来说非常有效，也不会冻结通知.

This works perfectly for me and doesn't freeze the notifications too.

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