Java 在Android上不使用Dropbox API从Dropbox下载APK

我想在不使用API的情况下从dropbox下载APK。我有以下代码：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);

    // Initialise the button
    btn = (Button) findViewById(R.id.mybutton);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            new DownloadFilesTask().execute();

            // Show Download confirmation
            Toast confirmDownload = Toast.makeText(Main2Activity.this,"Download is complete",Toast.LENGTH_LONG);
            confirmDownload.show();
        }
    });
}

/**
 * Asynchronous Task Class
 * Will invoke a new stream with which the apk is to be downloaded
 */
private static class DownloadFilesTask extends AsyncTask<Void, Void, Void> {

    /**
     * Concurrent process to download the file from the path provided
     * @param voids Parameters of the method are not used
     * @return Return value of the method is unimportant
     */
    @Override
    protected Void doInBackground(Void... voids) {
        try{
            URL download = new URL(pathToAPK);
            ReadableByteChannel rbc= Channels.newChannel(download.openStream());
            FileOutputStream fileOut = new FileOutputStream(dowloadPath+ "file.apk");
            fileOut.getChannel().transferFrom(rbc, 0,1 << 24 );
            fileOut.flush();
            fileOut.close();
            rbc.close();
        }catch(Exception e){ e.printStackTrace(); }
        return null;
    }

@覆盖
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main2）；
//初始化按钮
btn=（按钮）findViewById（R.id.mybutton）；
btn.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图）{
新建下载文件任务（）.execute（）；
//显示下载确认
Toast confirmDownload=Toast.makeText（Main2Activity.this，“下载完成”，Toast.LENGTH\u LONG）；
confirmDownload.show（）；
}
});
}
/**
*异步任务类
*将调用用于下载apk的新流
*/
私有静态类DownloadFilesTask扩展了AsyncTask{
/**
*从提供的路径下载文件的并发进程
*未使用方法的@param voids参数
*方法的@return值不重要
*/
@凌驾
受保护的空位背景（空位…空位）{
试一试{
URL下载=新URL（路径至主键）；
ReadableByteChannel rbc=Channels.newChannel（下载.openStream（））；
FileOutputStream fileOut=新的FileOutputStream（dowloadPath+“file.apk”）；
fileOut.getChannel（）.transferFrom（rbc，0,1发送给任何收到此恼人错误的人

步骤1：将dropbox URL末尾的dl更改为1

步骤2：使用下载文件

工作起来很有魅力！不需要流等

    private void download() {
        DownloadManager downloadManager =  (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
        Uri Download_Uri = Uri.parse(dropboxPath);
        DownloadManager.Request request = new DownloadManager.Request(Download_Uri);

        request.setDescription("new version");
        request.setTitle("Updated App");
        request.setMimeType("application/vnd.android.package-archive");
        request.setDestinationInExternalPublicDir(pathApk,"new-app.apk");
//        request.setDestinationUri(Uri.parse(pathApk + "test.txt"));
//        request.setDestinationUri(Uri.parse(pathApk + "test.txt"));
        request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

        // Download will immediately
        downloadManager.enqueue(request);

    }

任何人都会犯这个讨厌的错误

步骤1：将dropbox URL末尾的dl更改为1

步骤2：使用下载文件

工作起来很有魅力！不需要流等

    private void download() {
        DownloadManager downloadManager =  (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
        Uri Download_Uri = Uri.parse(dropboxPath);
        DownloadManager.Request request = new DownloadManager.Request(Download_Uri);

        request.setDescription("new version");
        request.setTitle("Updated App");
        request.setMimeType("application/vnd.android.package-archive");
        request.setDestinationInExternalPublicDir(pathApk,"new-app.apk");
//        request.setDestinationUri(Uri.parse(pathApk + "test.txt"));
//        request.setDestinationUri(Uri.parse(pathApk + "test.txt"));
        request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

        // Download will immediately
        downloadManager.enqueue(request);

    }

这是否回答了您的问题？感谢您的想法，将dl更改为1并不能解决问题。请参见下文。这是否回答了您的问题？感谢您的想法，将dl更改为1并不能解决问题。请参见下文