如何从ftp服务器下载文件并在android应用程序中播放？

我正在制作一个用于播放视频的应用程序，但我想将视频放在服务器上，然后在应用程序安装后下载并在应用程序中播放。请帮帮我

好的，我知道你的问题了……看看这个答案 在应用程序中创建一个启动屏幕，这将是您下载此视频并保存到外部存储的第一个屏幕，如下所示

在类中声明变量

ProgressDialog progress;
String path;

再创造

        new LoadUrlData().execute();

这是从服务器url下载视频的异步类

class LoadUrlData extends AsyncTask<Void, Void,String>
{

    @Override 
    protected void onPreExecute() { 
        progress= ProgressDialog.show(MainActivity.this,"Downloading !",
                "Please Wait");
    } 
    @Override
    protected String doInBackground(Void... params) {
        // TODO Auto-generated method stub
        downloadFileFromServer();

        return null;
    }

    @Override
    protected void onPostExecute(String result) {
        // TODO Auto-generated method stub
        progress.dismiss();

        super.onPostExecute(result);

    }

}
    public void downloadFileFromServer() 
{
    try {
        //set the download URL, a url that points to a file on the internet
        //this is the file to be downloaded
        URL url = new URL("server url to download video file");

        //create the new connection
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

        //set up some things on the connection
        urlConnection.setRequestMethod("GET");//or Post
        urlConnection.setDoOutput(true);

        //and connect!
        urlConnection.connect();

        //set the path where we want to save the file
        //in this case, going to save it on the root directory of the
        //sd card.
        File SDCardRoot = Environment.getExternalStorageDirectory();
        //create a new file, specifying the path, and the filename
        //which we want to save the file as.
        File file = new File(SDCardRoot,"videofilename.mp4");
        path = file.getAbsolutePath();
        Log.e("Path of file =", "path ="+file.getAbsolutePath());
        //this will be used to write the downloaded data into the file we created
        FileOutputStream fileOutput = new FileOutputStream(file);

        //this will be used in reading the data from the internet
        InputStream inputStream = urlConnection.getInputStream();

        //this is the total size of the file
        int totalSize = urlConnection.getContentLength();
        //variable to store total downloaded bytes
        int downloadedSize = 0;

        //create a buffer...
        byte[] buffer = new byte[1024];
        int bufferLength = 0; //used to store a temporary size of the buffer

        //now, read through the input buffer and write the contents to the file
        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;
            //this is where you would do something to report the prgress, like this maybe

        }
        //close the output stream when done
        fileOutput.close();

        //catch some possible errors...
    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

}

---

我希望这能对您有所帮助。

不，先生，这是一种糟糕的方法，我想在安装应用程序时下载视频（意思是在安装过程中），而您的方法每次运行应用程序时都会下载视频…….适合此用途基于filter.addAction（Intent.ACTION\u PACKAGE\u INSTALL）的广播接收器；有关更多信息，请点击此链接

videoview.setVideoURI(path);