显示下载进度条
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【中文标题】显示下载进度条【英文标题】:show download progress bar 【发布时间】:2021-10-26 04:24:50 【问题描述】:在我的应用程序中,我使用执行器服务从 url 下载文件。现在我想添加一个水平进度条来显示下载进度。但我面临错误。如何在不使用异步任务的情况下在此代码中添加进度条?
private class ExecutorServiceDownload implements Runnable
private String url;
public ExecutorServiceDownload(String url)
this.url = url;
@Override
public void run()
dlFile(url);
private String dlFile(String surl)
try
// I added progressbar here and it didn't download anything
InputStream input = null;
OutputStream output = null;
HttpURLConnection connection = null;
URL url = new URL(surl);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
if (connection.getResponseCode() != HttpURLConnection.HTTP_OK)
return "Server returned HTTP " + connection.getResponseCode() + " " + connection.getResponseMessage();
input = connection.getInputStream();
String title = URLUtil.guessFileName(String.valueOf(url), null, null);
output = new FileOutputStream(Environment.getExternalStorageDirectory().toString() + "/test_files" + "/" + title);
int contentLength = connection.getContentLength();
byte data[] = new byte[4096];
long total = 0;
int count;
while ((count = input.read(data)) != -1)
total += count;
output.write(data, 0, count);
catch (Exception e)
return e.toString();
return null;
【问题讨论】:
***.com/questions/3028306/… 我以前看过这个。我不想使用异步任务 【参考方案1】:将此代码与执行器服务一起下载:
在 onCreate 中:
ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreat`enter code here`e(savedInstanceState);
setContentView(R.layout.activity_main);
progressBar = findViewById(R.id.progressbar);
downloading();
使用执行器服务下载文件:
private void downloading()
progressBar.setVisibility(View.VISIBLE);
ExecutorService executor = Executors.newSingleThreadScheduledExecutor();
Handler handler = new Handler(Looper.getMainLooper());
executor.execute(new Runnable()
int count;
@Override
public void run()
//Background work here
try
// put your url.this is sample url.
URL url = new URL("http://techslides.com/demos/sample-videos/small.mp4");
URLConnection conection = url.openConnection();
conection.connect();
int lenghtOfFile = conection.getContentLength();
// download the file
InputStream input = conection.getInputStream();
//catalogfile is your destenition folder
OutputStream output = new FileOutputStream(catalogfile + "video.mp4");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1)
total += count;
// publishing the progress....
publishProgress(Integer.valueOf("" + (int) ((total * 100) / lenghtOfFile)));
// writing data to file
output.write(data, 0, count);
// flushing output
output.flush();
// closing streams
output.close();
input.close();
handler.post(new Runnable()
@Override
public void run()
//UI Thread work here
progressBar.setVisibility(View.GONE);
);
catch (Exception e)
);
更新进度条
private void publishProgress(Integer... progress)
progressBar.setProgress(progress[0]);
和水平进度条的使用:
<ProgressBar
android:max="100"
style="?android:attr/progressBarStyleHorizontal"
android:visibility="invisible"
android:id="@+id/progressbar"
android:layout_
android:layout_
【讨论】:
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