android – 为什么NotificationManager在更新过程中运行得如此之慢？

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

那为什么它的工作如此之慢？

解决方法

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.