我想在不使用API的情况下从dropbox下载一个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;
}
文件下载成功,但是当我打开文件时,我得到的是:
解析错误: 解析包的时候出现了一个问题
我猜是文件因某种原因损坏了。任何猜测?
对于任何有这种不知情的错误的人。
第1步:将dropbox URL末尾的dl改为1。
第二步:使用 下载管理器 下载文件
工作起来得心应手! 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);
}