add export newipe db function

app/src/main/java/org/schabi/newpipe/settings/ContentSettingsFragment.java

@@ -1,9 +1,12 @@
 package org.schabi.newpipe.settings;
 
 import android.app.Activity;
+import android.content.Intent;
 import android.os.Bundle;
 import android.support.v7.preference.ListPreference;
 import android.support.v7.preference.Preference;
+import android.util.Log;
+import android.widget.Toast;
 
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.extractor.NewPipe;
@@ -12,19 +15,26 @@ import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.report.ErrorActivity;
 import org.schabi.newpipe.report.UserAction;
 import org.schabi.newpipe.util.Constants;
+import org.schabi.newpipe.util.FilePickerActivityHelper;
 import org.schabi.newpipe.util.KioskTranslator;
+import org.schabi.newpipe.util.ZipHelper;
+
+import java.io.BufferedOutputStream;
+import java.io.FileOutputStream;
+import java.util.zip.ZipOutputStream;
 
 public class ContentSettingsFragment extends BasePreferenceFragment {
 
+    private static final int REQUEST_IMPORT_PATH = 80945;
+    private static final int REQUEST_EXPORT_PATH = 30945;
+
     @Override
     public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
 
         addPreferencesFromResource(R.xml.content_settings);
 
         final ListPreference mainPageContentPref =  (ListPreference) findPreference(getString(R.string.main_page_content_key));
-        mainPageContentPref.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        mainPageContentPref.setOnPreferenceChangeListener((Preference preference, Object newValueO) -> {
-                    @Override
-                    public boolean onPreferenceChange(Preference preference, Object newValueO) {
                         final String newValue = newValueO.toString();
 
                         final String mainPrefOldValue =
@@ -95,8 +105,67 @@ public class ContentSettingsFragment extends BasePreferenceFragment {
                         defaultPreferences.edit().putBoolean(Constants.KEY_MAIN_PAGE_CHANGE, true).apply();
 
                         return true;
-                    }
+                    });
-                });
+
+        Preference importDataPreference = findPreference(getString(R.string.import_data));
+        importDataPreference.setOnPreferenceClickListener((Preference p) -> {
+            Intent i = new Intent(getActivity(), FilePickerActivityHelper.class)
+                    .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_MULTIPLE, false)
+                    .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_CREATE_DIR, false)
+                    .putExtra(FilePickerActivityHelper.EXTRA_MODE, FilePickerActivityHelper.MODE_FILE);
+            startActivityForResult(i, REQUEST_EXPORT_PATH);
+            return true;
+        });
+
+        Preference exportDataPreference = findPreference(getString(R.string.export_data));
+        exportDataPreference.setOnPreferenceClickListener((Preference p) -> {
+            Intent i = new Intent(getActivity(), FilePickerActivityHelper.class)
+                    .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_MULTIPLE, false)
+                    .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_CREATE_DIR, true)
+                    .putExtra(FilePickerActivityHelper.EXTRA_MODE, FilePickerActivityHelper.MODE_DIR);
+            startActivityForResult(i, REQUEST_EXPORT_PATH);
+            return true;
+        });
+    }
+
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+        if (DEBUG) {
+            Log.d(TAG, "onActivityResult() called with: requestCode = [" + requestCode + "], resultCode = [" + resultCode + "], data = [" + data + "]");
+        }
+
+        if ((requestCode == REQUEST_IMPORT_PATH || requestCode == REQUEST_EXPORT_PATH)
+                && resultCode == Activity.RESULT_OK) {
+            String path = data.getData().getPath();
+            if(requestCode == REQUEST_EXPORT_PATH) {
+                exportDatabase(path + "/NewPipeData.zip");
+            } else {
+                importDatabase(path);
+            }
+        }
+    }
+
+    private void exportDatabase(String path) {
+        try {
+            ZipOutputStream outZip = new ZipOutputStream(
+                    new BufferedOutputStream(
+                            new FileOutputStream(path)));
+            final String homeDir = getActivity().getApplicationInfo().dataDir;
+            ZipHelper.addFileToZip(outZip, homeDir + "/databases/newpipe.db", "newpipe.db");
+            ZipHelper.addFileToZip(outZip, homeDir + "/databases/newpipe.db-journal", "newpipe.db-journal");
+
+            outZip.close();
+
+            Toast.makeText(getContext(), getString(R.string.export_complete_toast), Toast.LENGTH_SHORT)
+                    .show();
+        } catch (Exception e) {
+            onError(e);
+        }
+    }
+
+    private void importDatabase(String path) {
+
     }
 
     @Override

app/src/main/java/org/schabi/newpipe/settings/DownloadSettingsFragment.java

@@ -46,7 +46,8 @@ public class DownloadSettingsFragment extends BasePreferenceFragment {
              Log.d(TAG, "onPreferenceTreeClick() called with: preference = [" + preference + "]");
         }
 
-        if (preference.getKey().equals(DOWNLOAD_PATH_PREFERENCE) || preference.getKey().equals(DOWNLOAD_PATH_AUDIO_PREFERENCE)) {
+        if (preference.getKey().equals(DOWNLOAD_PATH_PREFERENCE)
+                || preference.getKey().equals(DOWNLOAD_PATH_AUDIO_PREFERENCE)) {
             Intent i = new Intent(getActivity(), FilePickerActivityHelper.class)
                     .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_MULTIPLE, false)
                     .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_CREATE_DIR, true)

app/src/main/java/org/schabi/newpipe/util/ZipHelper.java

@@ -0,0 +1,51 @@
+package org.schabi.newpipe.util;
+
+import java.io.BufferedInputStream;
+import java.io.FileInputStream;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
+
+/**
+ * Created by Christian Schabesberger on 28.01.18.
+ * Copyright 2018 Christian Schabesberger <chris.schabesberger@mailbox.org>
+ * ZipHelper.java is part of NewPipe
+ *
+ * License: GPL-3.0+
+ * This program 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.
+ *
+ * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+public class ZipHelper {
+
+    private static final int BUFFER_SIZE = 2048;
+
+    /**
+     * This function helps to create zip files
+     * @param outZip The ZipOutputStream where the data should be stored in
+     * @param file The path of the file that should be added to zip.
+     * @param name The path of the file inside the zip.
+     * @throws Exception
+     */
+    public static void addFileToZip(ZipOutputStream outZip, String file, String name) throws Exception {
+        byte data[] = new byte[BUFFER_SIZE];
+        FileInputStream fi = new FileInputStream(file);
+        BufferedInputStream inputStream = new BufferedInputStream(fi, BUFFER_SIZE);
+        ZipEntry entry = new ZipEntry(name);
+        outZip.putNextEntry(entry);
+        int count;
+        while((count = inputStream.read(data, 0, BUFFER_SIZE)) != -1) {
+            outZip.write(data, 0, count);
+        }
+        inputStream.close();
+    }
+}

app/src/main/res/values/settings_keys.xml

@@ -131,6 +131,8 @@
     <string name="main_page_selected_channel_name" translatable="false">main_page_selected_channel_name</string>
     <string name="main_page_selected_channel_url" translatable="false">main_page_selected_channel_url</string>
     <string name="main_page_selectd_kiosk_id" translatable="false">main_page_selectd_kiosk_id</string>
+    <string name="import_data">import_data</string>
+    <string name="export_data">export_data</string>
 
     <!-- FileName Downloads  -->
     <string name="settings_file_charset_key" translatable="false">file_rename</string>

app/src/main/res/values/strings.xml

@@ -134,6 +134,10 @@
     <string name="switch_to_popup">Switch to Popup</string>
     <string name="switch_to_main">Switch to Main</string>
 
+    <string name="import_data_title">Import database</string>
+    <string name="export_data_title">Export database</string>
+    <string name="import_data_summary">Will override your current history and subscriptions</string>
+    <string name="export_data_summary">Export history, subscriptions and playlists.</string>
     <!-- error strings -->
     <string name="general_error">Error</string>
     <string name="network_error">Network error</string>
@@ -317,6 +321,7 @@
     <string name="select_a_channel">Select a channel</string>
     <string name="no_channel_subscribed_yet">No channel subscribed yet</string>
     <string name="select_a_kiosk">Select a kiosk</string>
+    <string name="export_complete_toast">Export complete</string>
 
     <!-- Kiosk Names -->
     <string name="kiosk">Kiosk</string>

app/src/main/res/xml/content_settings.xml

@@ -37,4 +37,14 @@
         android:key="@string/main_page_content_key"
         android:title="@string/main_page_content"
         android:summary="%s"/>
+
+    <Preference
+        android:summary="@string/import_data_summary"
+        android:key="@string/import_data"
+        android:title="@string/import_data_title"/>
+
+    <Preference
+        android:title="@string/export_data_title"
+        android:key="@string/export_data"
+        android:summary="@string/export_data_summary"/>
 </PreferenceScreen>