Java tutorial
/* * Tweetings - Twitter client for Android * * Copyright (C) 2012-2013 RBD Solutions Limited <apps@tweetings.net> * Copyright (C) 2012 Mariotaku Lee <mariotaku.lee@gmail.com> * * 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/>. */ package com.dwdesign.tweetings.fragment; import com.dwdesign.tweetings.R; import com.dwdesign.tweetings.adapter.UserAutoCompleteAdapter; import com.dwdesign.tweetings.provider.TweetStore.Filters; import android.app.AlertDialog; import android.app.Dialog; import android.content.BroadcastReceiver; import android.content.ContentResolver; import android.content.ContentValues; import android.content.Context; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.content.Intent; import android.content.IntentFilter; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.widget.SimpleCursorAdapter; import android.view.LayoutInflater; 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.AutoCompleteTextView; import android.widget.ListView; import android.widget.Toast; public abstract class BaseFiltersFragment extends BaseListFragment implements LoaderCallbacks<Cursor>, OnItemLongClickListener { private static final String INTENT_KEY_AUTO_COMPLETE = "auto_complete"; private FilterListAdapter mAdapter; private ContentResolver mResolver; private final BroadcastReceiver mStateReceiver = new BroadcastReceiver() { @Override public void onReceive(final Context context, final Intent intent) { final String action = intent.getAction(); if (BROADCAST_FILTERS_UPDATED.equals(action)) { getLoaderManager().restartLoader(0, null, BaseFiltersFragment.this); } } }; @Override public void onActivityCreated(final Bundle savedInstanceState) { mResolver = getContentResolver(); super.onActivityCreated(savedInstanceState); setHasOptionsMenu(true); mAdapter = new FilterListAdapter(getActivity()); setListAdapter(mAdapter); getListView().setOnItemLongClickListener(this); getLoaderManager().initLoader(0, null, this); } @Override public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) { menu.clear(); inflater.inflate(R.menu.menu_filter, menu); super.onCreateOptionsMenu(menu, inflater); } @Override public Loader<Cursor> onCreateLoader(final int id, final Bundle args) { final String[] cols = getContentColumns(); final Uri uri = getContentUri(); return new CursorLoader(getActivity(), uri, cols, null, null, null); } @Override public boolean onItemLongClick(final AdapterView<?> adapter, final View view, final int position, final long id) { final String where = Filters._ID + " = " + id; mResolver.delete(getContentUri(), where, null); getLoaderManager().restartLoader(0, null, this); return true; } @Override public void onListItemClick(final ListView l, final View v, final int position, final long id) { Toast.makeText(getActivity(), R.string.longclick_to_delete, Toast.LENGTH_SHORT).show(); super.onListItemClick(l, v, position, id); } @Override public void onLoaderReset(final Loader<Cursor> loader) { mAdapter.swapCursor(null); } @Override public void onLoadFinished(final Loader<Cursor> loader, final Cursor data) { mAdapter.swapCursor(data); } @Override public boolean onOptionsItemSelected(final MenuItem item) { switch (item.getItemId()) { case MENU_ADD: final Bundle args = new Bundle(); args.putBoolean(INTENT_KEY_AUTO_COMPLETE, this instanceof FilteredUsersFragment); args.putParcelable(INTENT_KEY_URI, getContentUri()); final AddItemFragment fragment = new AddItemFragment(); fragment.setArguments(args); fragment.show(getFragmentManager(), "add_rule"); break; } return super.onOptionsItemSelected(item); } @Override public void onStart() { super.onStart(); final IntentFilter filter = new IntentFilter(BROADCAST_FILTERS_UPDATED); registerReceiver(mStateReceiver, filter); } @Override public void onStop() { unregisterReceiver(mStateReceiver); super.onStop(); } protected abstract String[] getContentColumns(); protected abstract Uri getContentUri(); public static final class AddItemFragment extends BaseDialogFragment implements OnClickListener { private AutoCompleteTextView mEditText; private UserAutoCompleteAdapter mUserAutoCompleteAdapter; @Override public void onClick(final DialogInterface dialog, final int which) { switch (which) { case DialogInterface.BUTTON_POSITIVE: if (mEditText.length() <= 0) return; final ContentValues values = new ContentValues(); final String text = mEditText.getText().toString(); values.put(Filters.TEXT, text); final Bundle args = getArguments(); final Uri uri = args.getParcelable(INTENT_KEY_URI); getContentResolver().insert(uri, values); break; } } @Override public Dialog onCreateDialog(final Bundle savedInstanceState) { final Context context = getActivity(); final AlertDialog.Builder builder = new AlertDialog.Builder(context); final View view = LayoutInflater.from(context).inflate(R.layout.auto_complete_textview_default_style, null); builder.setView(view); mEditText = (AutoCompleteTextView) view.findViewById(R.id.edit_text); final Bundle args = getArguments(); if (args != null && args.getBoolean(INTENT_KEY_AUTO_COMPLETE)) { mUserAutoCompleteAdapter = new UserAutoCompleteAdapter(getActivity()); mEditText.setAdapter(mUserAutoCompleteAdapter); mEditText.setThreshold(1); } builder.setTitle(R.string.add_rule); builder.setPositiveButton(android.R.string.ok, this); builder.setNegativeButton(android.R.string.cancel, this); return builder.create(); } } public static final class FilteredKeywordsFragment extends BaseFiltersFragment { @Override public String[] getContentColumns() { return Filters.Keywords.COLUMNS; } @Override public Uri getContentUri() { return Filters.Keywords.CONTENT_URI; } } public static final class FilteredSourcesFragment extends BaseFiltersFragment { @Override public String[] getContentColumns() { return Filters.Sources.COLUMNS; } @Override public Uri getContentUri() { return Filters.Sources.CONTENT_URI; } } public static final class FilteredUsersFragment extends BaseFiltersFragment { @Override public String[] getContentColumns() { return Filters.Users.COLUMNS; } @Override public Uri getContentUri() { return Filters.Users.CONTENT_URI; } } public static final class FilterListAdapter extends SimpleCursorAdapter { private static final String[] from = new String[] { Filters.TEXT }; private static final int[] to = new int[] { android.R.id.text1 }; public FilterListAdapter(final Context context) { super(context, android.R.layout.simple_list_item_1, null, from, to, 0); } } }