Java tutorial
package org.schabi.newpipe; import android.Manifest; import android.app.Activity; import android.app.Dialog; import android.app.DownloadManager; import android.app.Notification; import android.content.Context; import android.content.DialogInterface; import android.content.SharedPreferences; import android.content.pm.PackageManager; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.preference.PreferenceManager; import android.support.annotation.NonNull; import android.support.v4.app.ActivityCompat; import android.support.v4.app.DialogFragment; import android.support.v4.content.ContextCompat; import android.support.v7.app.AlertDialog; import android.util.Log; import android.widget.Toast; import java.io.File; import java.util.ArrayList; import java.util.List; /** * Created by Christian Schabesberger on 21.09.15. * * Copyright (C) Christian Schabesberger 2015 <chris.schabesberger@mailbox.org> * DownloadDialog.java is part of NewPipe. * * NewPipe is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * NewPipe is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with NewPipe. If not, see <http://www.gnu.org/licenses/>. */ public class DownloadDialog extends DialogFragment { private static final String TAG = DialogFragment.class.getName(); public static final String TITLE = "name"; public static final String FILE_SUFFIX_AUDIO = "file_suffix_audio"; public static final String FILE_SUFFIX_VIDEO = "file_suffix_video"; public static final String AUDIO_URL = "audio_url"; public static final String VIDEO_URL = "video_url"; private Bundle arguments; @NonNull @Override public Dialog onCreateDialog(Bundle savedInstanceState) { arguments = getArguments(); super.onCreateDialog(savedInstanceState); if (ContextCompat.checkSelfPermission(this.getContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) ActivityCompat.requestPermissions(getActivity(), new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, 0); AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); builder.setTitle(R.string.download_dialog_title).setItems(R.array.download_options, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Context context = getActivity(); SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); String suffix = ""; String title = arguments.getString(TITLE); String url = ""; File downloadDir = NewPipeSettings.getDownloadFolder(); switch (which) { case 0: // Video suffix = arguments.getString(FILE_SUFFIX_VIDEO); url = arguments.getString(VIDEO_URL); downloadDir = NewPipeSettings.getVideoDownloadFolder(context); break; case 1: suffix = arguments.getString(FILE_SUFFIX_AUDIO); url = arguments.getString(AUDIO_URL); downloadDir = NewPipeSettings.getAudioDownloadFolder(context); break; default: Log.d(TAG, "lolz"); } if (!downloadDir.exists()) { //attempt to create directory boolean mkdir = downloadDir.mkdirs(); if (!mkdir && !downloadDir.isDirectory()) { String message = context.getString(R.string.err_dir_create, downloadDir.toString()); Log.e(TAG, message); Toast.makeText(context, message, Toast.LENGTH_LONG).show(); return; } String message = context.getString(R.string.info_dir_created, downloadDir.toString()); Log.e(TAG, message); Toast.makeText(context, message, Toast.LENGTH_LONG).show(); } File saveFilePath = new File(downloadDir, createFileName(title) + suffix); long id = 0; if (App.isUsingTor()) { // if using Tor, do not use DownloadManager because the proxy cannot be set Downloader.downloadFile(getContext(), url, saveFilePath, title); } else { DownloadManager dm = (DownloadManager) context .getSystemService(Context.DOWNLOAD_SERVICE); DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url)); request.setDestinationUri(Uri.fromFile(saveFilePath)); request.setNotificationVisibility( DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); request.setTitle(title); request.setDescription("'" + url + "' => '" + saveFilePath + "'"); request.allowScanningByMediaScanner(); try { id = dm.enqueue(request); } catch (Exception e) { e.printStackTrace(); } } Log.i(TAG, "Started downloading '" + url + "' => '" + saveFilePath + "' #" + id); } }); return builder.create(); } /** * #143 #44 #42 #22: make shure that the filename does not contain illegal chars. * This should fix some of the "cannot download" problems. * */ private String createFileName(String fName) { // from http://eng-przemelek.blogspot.de/2009/07/how-to-create-valid-file-name.html List<String> forbiddenCharsPatterns = new ArrayList<String>(); forbiddenCharsPatterns.add("[:]+"); // Mac OS, but it looks that also Windows XP forbiddenCharsPatterns.add("[\\*\"/\\\\\\[\\]\\:\\;\\|\\=\\,]+"); // Windows forbiddenCharsPatterns.add("[^\\w\\d\\.]+"); // last chance... only latin letters and digits String nameToTest = fName; for (String pattern : forbiddenCharsPatterns) { nameToTest = nameToTest.replaceAll(pattern, "_"); } return nameToTest; } }