如何使用AsyncTask的显示进度条，倒计时？ [英] How to use asynctask to display a progress bar that counts down?

问题描述

在我的应用程序，我希望用户preSS一个按钮，然后等待5分钟。我知道这听起​​来很可怕，但只是去用它。残留在5分钟的等待期的时间应显示在进度条

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.

我使用的是CountDownTimer以文本视图倒计时，但我的老板想要的东西，看起来更好。因此推理的进度条。

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

您可以做这样的事情。

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);
    }
}

这应该可以解决你的目的，它甚至不会阻塞UI花纹。

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

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