Java tutorial
/** * Flym * <p/> * Copyright (c) 2012-2015 Frederic Julian * <p/> * 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. * <p/> * 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. * <p/> * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * <p/> * <p/> * Some parts of this software are based on "Sparse rss" under the MIT license (see * below). Please refers to the original project to identify which parts are under the * MIT license. * <p/> * Copyright (c) 2010-2012 Stefan Handschuh * <p/> * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * <p/> * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * <p/> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package net.fred.feedex.activity; import android.app.AlertDialog; import android.app.LoaderManager; import android.app.ProgressDialog; import android.content.ContentResolver; import android.content.ContentValues; import android.content.Context; import android.content.CursorLoader; import android.content.DialogInterface; import android.content.Intent; import android.content.Loader; import android.database.Cursor; import android.os.Bundle; import android.support.v7.view.ActionMode; import android.support.v7.widget.Toolbar; import android.text.Html; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemLongClickListener; import android.widget.CheckBox; import android.widget.EditText; import android.widget.ListView; import android.widget.RadioButton; import android.widget.SimpleAdapter; import android.widget.TabHost; import net.fred.feedex.Constants; import net.fred.feedex.R; import net.fred.feedex.adapter.FiltersCursorAdapter; import net.fred.feedex.loader.BaseLoader; import net.fred.feedex.provider.FeedData.FeedColumns; import net.fred.feedex.provider.FeedData.FilterColumns; import net.fred.feedex.provider.FeedDataContentProvider; import net.fred.feedex.utils.Dog; import net.fred.feedex.utils.NetworkUtils; import net.fred.feedex.utils.UiUtils; import org.json.JSONArray; import org.json.JSONObject; import java.io.UnsupportedEncodingException; import java.net.HttpURLConnection; import java.net.URLEncoder; import java.util.ArrayList; import java.util.HashMap; public class EditFeedActivity extends BaseActivity implements LoaderManager.LoaderCallbacks<Cursor> { static final String FEED_SEARCH_TITLE = "title"; static final String FEED_SEARCH_URL = "url"; static final String FEED_SEARCH_DESC = "contentSnippet"; private static final String STATE_CURRENT_TAB = "STATE_CURRENT_TAB"; private static final String[] FEED_PROJECTION = new String[] { FeedColumns.NAME, FeedColumns.URL, FeedColumns.RETRIEVE_FULLTEXT, FeedColumns.IS_GROUP }; private final ActionMode.Callback mFilterActionModeCallback = new ActionMode.Callback() { // Called when the action mode is created; startActionMode() was called @Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { // Inflate a menu resource providing context menu items MenuInflater inflater = mode.getMenuInflater(); inflater.inflate(R.menu.edit_context_menu, menu); return true; } // Called each time the action mode is shown. Always called after onCreateActionMode, but // may be called multiple times if the mode is invalidated. @Override public boolean onPrepareActionMode(ActionMode mode, Menu menu) { return false; // Return false if nothing is done } // Called when the user selects a contextual menu item @Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { switch (item.getItemId()) { case R.id.menu_edit: Cursor c = mFiltersCursorAdapter.getCursor(); if (c.moveToPosition(mFiltersCursorAdapter.getSelectedFilter())) { final View dialogView = getLayoutInflater().inflate(R.layout.dialog_filter_edit, null); final EditText filterText = (EditText) dialogView.findViewById(R.id.filterText); final CheckBox regexCheckBox = (CheckBox) dialogView.findViewById(R.id.regexCheckBox); final RadioButton applyTitleRadio = (RadioButton) dialogView.findViewById(R.id.applyTitleRadio); final RadioButton applyContentRadio = (RadioButton) dialogView .findViewById(R.id.applyContentRadio); final RadioButton acceptRadio = (RadioButton) dialogView.findViewById(R.id.acceptRadio); final RadioButton rejectRadio = (RadioButton) dialogView.findViewById(R.id.rejectRadio); filterText.setText(c.getString(c.getColumnIndex(FilterColumns.FILTER_TEXT))); regexCheckBox.setChecked(c.getInt(c.getColumnIndex(FilterColumns.IS_REGEX)) == 1); if (c.getInt(c.getColumnIndex(FilterColumns.IS_APPLIED_TO_TITLE)) == 1) { applyTitleRadio.setChecked(true); } else { applyContentRadio.setChecked(true); } if (c.getInt(c.getColumnIndex(FilterColumns.IS_ACCEPT_RULE)) == 1) { acceptRadio.setChecked(true); } else { rejectRadio.setChecked(true); } final long filterId = mFiltersCursorAdapter .getItemId(mFiltersCursorAdapter.getSelectedFilter()); new AlertDialog.Builder(EditFeedActivity.this) // .setTitle(R.string.filter_edit_title) // .setView(dialogView) // .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { new Thread() { @Override public void run() { String filter = filterText.getText().toString(); if (!filter.isEmpty()) { ContentResolver cr = getContentResolver(); ContentValues values = new ContentValues(); values.put(FilterColumns.FILTER_TEXT, filter); values.put(FilterColumns.IS_REGEX, regexCheckBox.isChecked()); values.put(FilterColumns.IS_APPLIED_TO_TITLE, applyTitleRadio.isChecked()); values.put(FilterColumns.IS_ACCEPT_RULE, acceptRadio.isChecked()); if (cr.update(FilterColumns.CONTENT_URI, values, FilterColumns._ID + '=' + filterId, null) > 0) { cr.notifyChange( FilterColumns.FILTERS_FOR_FEED_CONTENT_URI( getIntent().getData().getLastPathSegment()), null); } } } }.start(); } }).setNegativeButton(android.R.string.cancel, null).show(); } mode.finish(); // Action picked, so close the CAB return true; case R.id.menu_delete: final long filterId = mFiltersCursorAdapter.getItemId(mFiltersCursorAdapter.getSelectedFilter()); new AlertDialog.Builder(EditFeedActivity.this) // .setIcon(android.R.drawable.ic_dialog_alert) // .setTitle(R.string.filter_delete_title) // .setMessage(R.string.question_delete_filter) // .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { new Thread() { @Override public void run() { ContentResolver cr = getContentResolver(); if (cr.delete(FilterColumns.CONTENT_URI, FilterColumns._ID + '=' + filterId, null) > 0) { cr.notifyChange(FilterColumns.FILTERS_FOR_FEED_CONTENT_URI( getIntent().getData().getLastPathSegment()), null); } } }.start(); } }).setNegativeButton(android.R.string.no, null).show(); mode.finish(); // Action picked, so close the CAB return true; default: return false; } } // Called when the user exits the action mode @Override public void onDestroyActionMode(ActionMode mode) { mFiltersCursorAdapter.setSelectedFilter(-1); mFiltersListView.invalidateViews(); } }; private TabHost mTabHost; private EditText mNameEditText, mUrlEditText; private CheckBox mRetrieveFulltextCb; private ListView mFiltersListView; private FiltersCursorAdapter mFiltersCursorAdapter; @Override protected void onCreate(Bundle savedInstanceState) { UiUtils.setPreferenceTheme(this); super.onCreate(savedInstanceState); setContentView(R.layout.activity_feed_edit); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true); setResult(RESULT_CANCELED); Intent intent = getIntent(); mTabHost = (TabHost) findViewById(R.id.tabHost); mNameEditText = (EditText) findViewById(R.id.feed_title); mUrlEditText = (EditText) findViewById(R.id.feed_url); mRetrieveFulltextCb = (CheckBox) findViewById(R.id.retrieve_fulltext); mFiltersListView = (ListView) findViewById(android.R.id.list); View tabWidget = findViewById(android.R.id.tabs); mTabHost.setup(); mTabHost.addTab(mTabHost.newTabSpec("feedTab").setIndicator(getString(R.string.tab_feed_title)) .setContent(R.id.feed_tab)); mTabHost.addTab(mTabHost.newTabSpec("filtersTab").setIndicator(getString(R.string.tab_filters_title)) .setContent(R.id.filters_tab)); mTabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() { @Override public void onTabChanged(String s) { invalidateOptionsMenu(); } }); if (savedInstanceState != null) { mTabHost.setCurrentTab(savedInstanceState.getInt(STATE_CURRENT_TAB)); } if (intent.getAction().equals(Intent.ACTION_INSERT) || intent.getAction().equals(Intent.ACTION_SEND)) { setTitle(R.string.new_feed_title); tabWidget.setVisibility(View.GONE); if (intent.hasExtra(Intent.EXTRA_TEXT)) { mUrlEditText.setText(intent.getStringExtra(Intent.EXTRA_TEXT)); } } else if (intent.getAction().equals(Intent.ACTION_VIEW)) { setTitle(R.string.new_feed_title); tabWidget.setVisibility(View.GONE); mUrlEditText.setText(intent.getDataString()); } else if (intent.getAction().equals(Intent.ACTION_EDIT)) { setTitle(R.string.edit_feed_title); mFiltersCursorAdapter = new FiltersCursorAdapter(this, Constants.EMPTY_CURSOR); mFiltersListView.setAdapter(mFiltersCursorAdapter); mFiltersListView.setOnItemLongClickListener(new OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) { startSupportActionMode(mFilterActionModeCallback); mFiltersCursorAdapter.setSelectedFilter(position); mFiltersListView.invalidateViews(); return true; } }); getLoaderManager().initLoader(0, null, this); if (savedInstanceState == null) { Cursor cursor = getContentResolver().query(intent.getData(), FEED_PROJECTION, null, null, null); if (cursor != null && cursor.moveToNext()) { mNameEditText.setText(cursor.getString(0)); mUrlEditText.setText(cursor.getString(1)); mRetrieveFulltextCb.setChecked(cursor.getInt(2) == 1); if (cursor.getInt(3) == 1) { // if it's a group, we cannot edit it finish(); } } else { UiUtils.showMessage(EditFeedActivity.this, R.string.error); finish(); } if (cursor != null) { cursor.close(); } } } } @Override protected void onSaveInstanceState(Bundle outState) { outState.putInt(STATE_CURRENT_TAB, mTabHost.getCurrentTab()); super.onSaveInstanceState(outState); } @Override protected void onDestroy() { if (getIntent().getAction().equals(Intent.ACTION_EDIT)) { String url = mUrlEditText.getText().toString(); ContentResolver cr = getContentResolver(); Cursor cursor = null; try { cursor = getContentResolver().query(FeedColumns.CONTENT_URI, FeedColumns.PROJECTION_ID, FeedColumns.URL + Constants.DB_ARG, new String[] { url }, null); if (cursor != null && cursor.moveToFirst() && !getIntent().getData().getLastPathSegment().equals(cursor.getString(0))) { UiUtils.showMessage(EditFeedActivity.this, R.string.error_feed_url_exists); } else { ContentValues values = new ContentValues(); if (!url.startsWith(Constants.HTTP_SCHEME) && !url.startsWith(Constants.HTTPS_SCHEME)) { url = Constants.HTTP_SCHEME + url; } values.put(FeedColumns.URL, url); String name = mNameEditText.getText().toString(); values.put(FeedColumns.NAME, name.trim().length() > 0 ? name : null); values.put(FeedColumns.RETRIEVE_FULLTEXT, mRetrieveFulltextCb.isChecked() ? 1 : null); values.put(FeedColumns.FETCH_MODE, 0); values.putNull(FeedColumns.ERROR); cr.update(getIntent().getData(), values, null, null); } } catch (Exception ignored) { } finally { if (cursor != null) { cursor.close(); } } } super.onDestroy(); } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.edit_feed, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onPrepareOptionsMenu(Menu menu) { if (mTabHost.getCurrentTab() == 0) { menu.findItem(R.id.menu_add_filter).setVisible(false); } else { menu.findItem(R.id.menu_add_filter).setVisible(true); } if (getIntent() != null && getIntent().getAction().equals(Intent.ACTION_EDIT)) { menu.findItem(R.id.menu_validate).setVisible(false); // only in insert mode } return super.onPrepareOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: finish(); return true; case R.id.menu_validate: // only in insert mode final String name = mNameEditText.getText().toString().trim(); final String urlOrSearch = mUrlEditText.getText().toString().trim(); if (urlOrSearch.isEmpty()) { UiUtils.showMessage(EditFeedActivity.this, R.string.error_feed_error); } if (!urlOrSearch.contains(".") || !urlOrSearch.contains("/") || urlOrSearch.contains(" ")) { final ProgressDialog pd = new ProgressDialog(EditFeedActivity.this); pd.setMessage(getString(R.string.loading)); pd.setCancelable(true); pd.setIndeterminate(true); pd.show(); getLoaderManager().restartLoader(1, null, new LoaderManager.LoaderCallbacks<ArrayList<HashMap<String, String>>>() { @Override public Loader<ArrayList<HashMap<String, String>>> onCreateLoader(int id, Bundle args) { String encodedSearchText = urlOrSearch; try { encodedSearchText = URLEncoder.encode(urlOrSearch, Constants.UTF8); } catch (UnsupportedEncodingException ignored) { } return new GetFeedSearchResultsLoader(EditFeedActivity.this, encodedSearchText); } @Override public void onLoadFinished(Loader<ArrayList<HashMap<String, String>>> loader, final ArrayList<HashMap<String, String>> data) { pd.cancel(); if (data == null) { UiUtils.showMessage(EditFeedActivity.this, R.string.error); } else if (data.isEmpty()) { UiUtils.showMessage(EditFeedActivity.this, R.string.no_result); } else { AlertDialog.Builder builder = new AlertDialog.Builder(EditFeedActivity.this); builder.setTitle(R.string.feed_search); // create the grid item mapping String[] from = new String[] { FEED_SEARCH_TITLE, FEED_SEARCH_DESC }; int[] to = new int[] { android.R.id.text1, android.R.id.text2 }; // fill in the grid_item layout SimpleAdapter adapter = new SimpleAdapter(EditFeedActivity.this, data, R.layout.item_search_result, from, to); builder.setAdapter(adapter, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { FeedDataContentProvider.addFeed(EditFeedActivity.this, data.get(which).get(FEED_SEARCH_URL), name.isEmpty() ? data.get(which).get(FEED_SEARCH_TITLE) : name, mRetrieveFulltextCb.isChecked()); setResult(RESULT_OK); finish(); } }); builder.show(); } } @Override public void onLoaderReset(Loader<ArrayList<HashMap<String, String>>> loader) { } }); } else { FeedDataContentProvider.addFeed(EditFeedActivity.this, urlOrSearch, name, mRetrieveFulltextCb.isChecked()); setResult(RESULT_OK); finish(); } return true; case R.id.menu_add_filter: { final View dialogView = getLayoutInflater().inflate(R.layout.dialog_filter_edit, null); new AlertDialog.Builder(this) // .setTitle(R.string.filter_add_title) // .setView(dialogView) // .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int id) { String filterText = ((EditText) dialogView.findViewById(R.id.filterText)).getText() .toString(); if (filterText.length() != 0) { String feedId = getIntent().getData().getLastPathSegment(); ContentValues values = new ContentValues(); values.put(FilterColumns.FILTER_TEXT, filterText); values.put(FilterColumns.IS_REGEX, ((CheckBox) dialogView.findViewById(R.id.regexCheckBox)).isChecked()); values.put(FilterColumns.IS_APPLIED_TO_TITLE, ((RadioButton) dialogView.findViewById(R.id.applyTitleRadio)).isChecked()); values.put(FilterColumns.IS_ACCEPT_RULE, ((RadioButton) dialogView.findViewById(R.id.acceptRadio)).isChecked()); ContentResolver cr = getContentResolver(); cr.insert(FilterColumns.FILTERS_FOR_FEED_CONTENT_URI(feedId), values); } } }).setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int id) { } }).show(); return true; } default: return super.onOptionsItemSelected(item); } } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { CursorLoader cursorLoader = new CursorLoader(this, FilterColumns.FILTERS_FOR_FEED_CONTENT_URI(getIntent().getData().getLastPathSegment()), null, null, null, FilterColumns.IS_ACCEPT_RULE + Constants.DB_DESC); cursorLoader.setUpdateThrottle(Constants.UPDATE_THROTTLE_DELAY); return cursorLoader; } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) { mFiltersCursorAdapter.swapCursor(data); } @Override public void onLoaderReset(Loader<Cursor> loader) { mFiltersCursorAdapter.swapCursor(Constants.EMPTY_CURSOR); } } /** * A custom Loader that loads feed search results from the google WS. */ class GetFeedSearchResultsLoader extends BaseLoader<ArrayList<HashMap<String, String>>> { private final String mSearchText; public GetFeedSearchResultsLoader(Context context, String searchText) { super(context); mSearchText = searchText; } /** * This is where the bulk of our work is done. This function is called in a background thread and should generate a new set of data to be * published by the loader. */ @Override public ArrayList<HashMap<String, String>> loadInBackground() { try { HttpURLConnection conn = NetworkUtils .setupConnection("https://ajax.googleapis.com/ajax/services/feed/find?v=1.0&q=" + mSearchText); try { String jsonStr = new String(NetworkUtils.getBytes(conn.getInputStream())); // Parse results final ArrayList<HashMap<String, String>> results = new ArrayList<>(); JSONObject response = new JSONObject(jsonStr).getJSONObject("responseData"); JSONArray entries = response.getJSONArray("entries"); for (int i = 0; i < entries.length(); i++) { try { JSONObject entry = (JSONObject) entries.get(i); String url = entry.get(EditFeedActivity.FEED_SEARCH_URL).toString(); if (!url.isEmpty()) { HashMap<String, String> map = new HashMap<>(); map.put(EditFeedActivity.FEED_SEARCH_TITLE, Html .fromHtml(entry.get(EditFeedActivity.FEED_SEARCH_TITLE).toString()).toString()); map.put(EditFeedActivity.FEED_SEARCH_URL, url); map.put(EditFeedActivity.FEED_SEARCH_DESC, Html .fromHtml(entry.get(EditFeedActivity.FEED_SEARCH_DESC).toString()).toString()); results.add(map); } } catch (Exception ignored) { } } return results; } finally { conn.disconnect(); } } catch (Exception e) { Dog.e("Error", e); return null; } } }