Question

当我下载文件时，我希望进度条与此同步。但不是，我的代码是：

Thread thread = new Thread() {
            public void run() {
                try {
                    while ( (bufferLength = inputStream.read(buffer)) > 0 ) {
                        //add the data in the buffer to the file in the file output stream (the file on the sd card
                        fileOutput.write(buffer, 0, bufferLength);
                        //add up the size so we know how much is downloaded
                        downloadedSize += bufferLength;
                        pbar.setProgress((downloadedSize/totalSize)*100);
                        pbar.refreshDrawableState();

                        Log.d("CURRENT:", "" + (downloadedSize/totalSize)*100);
                    }
                } catch (Exception ex) {

                }
            }
        };
        thread.start();

此外，我的catlog文件未更新。请帮助....

Answer 1

您无法从后台主题更新用户界面，使用AsyncTask因为Androiders称之为painless threading

Here is a nice Tutorial使用ProgressBar

使用AsyncTask

Answer 2

不需要AsyncTask，在你的线程中使用MyActivity.this.runOnUiThread()。会做与AsyncTask相同的工作，但它会减少你重新编码所有东西的时间。 :)干杯

Progressbar没有更新线程android

2 个答案: