Question

我有以下使用AsyncTask下载视频的代码。

//DOWNLOAD VIDEOS
private class downloadVideosAsync extends AsyncTask <String, String, String>{

    protected void onPreExecute(){
        super.onPreExecute();
        MyActivity.this.mProgressDialog.setMessage("Downloading Videos...");
    }

    @Override
    protected String doInBackground(String... strings){
        try{

            VideosC.downloadVideos( VideosM.getVideoNames(), VideosM.getVideoUrls(), 
                                    VideosM.getVideoThumbs(), VideosM.getFileModified() );

        }catch (NullPointerException e){
            Log.e(LOG_TAG, e.toString());
        }catch(Exception e){
            Log.e(LOG_TAG, e.toString());
        }
        return null;
    }

    @Override
    protected void onPostExecute(String lenghtOfFile) {
        new downloadSlideshowsAsync().execute();
    }
}

如您所见，我已为进度对话框设置了“正在下载视频...”消息。现在我想要做的是像setMessage（“下载1 of 5”）。但问题是我的downloadVideos功能是在另一个类文件VideosController.java

public void downloadVideos( ArrayList<String> VideoNames, ArrayList<String> VideoUrls,
                                ArrayList<String> VideoThumbs, ArrayList<String> fileModified){

    try{
        int x;
        int videoNamesLenght = VideoNames.size();
        File vidFile;
        for(x = 0; x < videoNamesLenght; x++) {

            String[] videoName = VideoNames.get(x).split("/");
            String currentFile = videoName[0] + "." + videoName[1];
            String currentFileURL = VideoUrls.get(x) + VideoNames.get(x);
            Log.v(LOG_TAG, "currentFileURL: " + currentFileURL);

            vidFile = new File(Environment.getExternalStorageDirectory() 
                                + "/MyApp/Downloads/Videos/", currentFile);

                    //I want to do maybe here something like
                    //mProgressDialog.setMessage("Downloading x of y")

            downloadVideoFile(currentFile, currentFileURL, vidFile, fileModified.get(x));

        }
    }catch(Exception e){
        Log.e(LOG_TAG, e.toString());
    }
}

有什么想法吗？非常感谢您的帮助！：）

Answer 1

您可以在Activity中定义一个静态函数来调用VideosController。在该功能中，您可以发送处理程序消息并进行处理。

Android进度对话框从类文件设置消息

1 个答案: