如何使用 asynctask 显示倒计时的进度条? [英] How to use asynctask to display a progress bar that counts down?

问题描述

在我的应用程序中，我希望用户按下一个按钮，然后等待 5 分钟.我知道这听起来很糟糕，但就随它去吧.5 分钟等待期内的剩余时间应显示在进度条中.

In my application i want the user to press a button and then wait 5 mins. i know this sounds terrible but just go with it. The time remaining in the 5 min wait period should be displayed in the progress bar.

我使用带有文本视图的 CountDownTimer 进行倒计时，但我的老板想要看起来更好的东西.因此是进度条的原因.

I was using a CountDownTimer with a text view to countdown but my boss wants something that looks better. hence the reasoning for a progress bar.

推荐答案

你可以这样做..

public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private ProgressDialog mProgressDialog;

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
    case DIALOG_DOWNLOAD_PROGRESS:
        mProgressDialog = new ProgressDialog(this);
        mProgressDialog.setMessage("waiting 5 minutes..");
        mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        mProgressDialog.setCancelable(false);
        mProgressDialog.show();
        return mProgressDialog;
    default:
    return null;
    }
}

然后写一个异步任务来更新进度..

Then write an async task to update progress..

private class DownloadZipFileTask extends AsyncTask<String, String, String> {

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        showDialog(DIALOG_DOWNLOAD_PROGRESS);
    }

    @Override
    protected String doInBackground(String... urls) {
        //Copy you logic to calculate progress and call
        publishProgress("" + progress);
    }

    protected void onProgressUpdate(String... progress) {        
    mProgressDialog.setProgress(Integer.parseInt(progress[0]));
    }

    @Override
    protected void onPostExecute(String result) {           
        dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
    }
}

这应该可以解决您的目的，它甚至不会阻止 UI 步调..

This should solve your purpose and it wont even block UI tread..

这篇关于如何使用 asynctask 显示倒计时的进度条?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！