为什么NotificationManager在更新过程中运行得如此之慢？

Question

我通过NotificationManager发布文件上传进度,但在更新其进度时,用户界面冻结.

我使用NotificationCompat.Builder,它在类字段中缓存.因此,进度发布非常简单:

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

保证更新进度从主线程执行(包装在Handler装饰器中).

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

进展情况如下:

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);
}

那为什么它的工作如此之慢？

Answer 1

这是一种常见的行为.您不应该频繁更新泛洪NotificationManager.您应该决定更新的时间间隔,例如每秒两次.

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;

这对我来说非常合适,也不会冻结通知.