Java tutorial
/* * Copyright (C) 2014 George Venios * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.veniosg.dir.android.fragment; import android.content.Intent; import android.database.Cursor; import android.os.Bundle; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.util.SparseBooleanArray; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.GridView; import android.widget.ListView; import android.widget.TextView; import com.veniosg.dir.R; import com.veniosg.dir.android.activity.AboutActivity; import com.veniosg.dir.android.activity.PreferenceActivity; import com.veniosg.dir.android.adapter.BookmarkListAdapter; import com.veniosg.dir.android.provider.BookmarkProvider; import com.veniosg.dir.android.ui.widget.WaitingViewFlipper; import java.io.File; import static android.view.View.GONE; import static com.veniosg.dir.android.ui.Themer.getThemedResourceId; import static com.veniosg.dir.android.ui.Themer.setStatusBarColour; public class SideNavFragment extends AbsListFragment implements LoaderManager.LoaderCallbacks<Cursor> { private WaitingViewFlipper mFlipper; private View.OnClickListener mSettingsClickListener = new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(getActivity(), PreferenceActivity.class); startActivity(intent); } }; private View.OnClickListener mAboutClickListener = new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(getActivity(), AboutActivity.class); startActivity(intent); } }; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_drawer, null); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); mFlipper = (WaitingViewFlipper) view.findViewById(R.id.flipper); setLoading(true); view.findViewById(R.id.empty_img).setVisibility(GONE); ((TextView) view.findViewById(R.id.empty_text)).setText(R.string.bookmark_empty); if (getListView() instanceof GridView) { ((GridView) getListView()).setNumColumns(1); } setListAdapter(new BookmarkListAdapter(getActivity(), null)); setListChoiceListener(); view.setBackgroundResource(getThemedResourceId(getActivity(), android.R.attr.colorBackground)); view.findViewById(R.id.action_settings).setOnClickListener(mSettingsClickListener); view.findViewById(R.id.action_about).setOnClickListener(mAboutClickListener); getLoaderManager().initLoader(0, null, this); } @Override public void onListItemClick(AbsListView l, View v, int position, long id) { Cursor c = ((Cursor) getListAdapter().getItem(position)); ((BookmarkContract) getActivity()).onBookmarkSelected(c.getString(c.getColumnIndex(BookmarkProvider.PATH))); } /** * Make the UI indicate loading. */ void setLoading(boolean loading) { if (loading) { mFlipper.setDisplayedChildDelayed(WaitingViewFlipper.PAGE_INDEX_LOADING); } else { mFlipper.setDisplayedChild(WaitingViewFlipper.PAGE_INDEX_CONTENT); } } private void setListChoiceListener() { getListView().setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() { @Override public boolean onPrepareActionMode(android.view.ActionMode mode, Menu menu) { menu.clear(); mode.getMenuInflater().inflate(R.menu.cab_bookmarks, menu); if (getListView().getCheckedItemCount() != 1) { menu.removeItem(R.id.menu_open_parent); } return true; } @Override public void onDestroyActionMode(android.view.ActionMode mode) { setStatusBarColour(getActivity(), false); } @Override public boolean onCreateActionMode(android.view.ActionMode mode, Menu menu) { setStatusBarColour(getActivity(), true); return true; } @Override public boolean onActionItemClicked(android.view.ActionMode mode, MenuItem item) { switch (item.getItemId()) { case R.id.menu_delete: long[] ids = getListView().getCheckedItemIds(); for (long id : ids) { getListView().getContext().getContentResolver().delete(BookmarkProvider.CONTENT_URI, BookmarkProvider._ID + "=?", new String[] { "" + id }); } mode.finish(); return true; case R.id.menu_open_parent: int pos = 0; SparseBooleanArray checked = getListView().getCheckedItemPositions(); for (int i = 0; i < getListView().getCount(); i++) { if (checked.get(i)) { pos = i; } } String path = ((Cursor) getListAdapter().getItem(pos)).getString(2); ((BookmarkContract) getActivity()).onBookmarkSelected(new File(path).getParent()); mode.finish(); return true; } return false; } @Override public void onItemCheckedStateChanged(android.view.ActionMode mode, int position, long id, boolean checked) { if (getListView().getCheckedItemCount() != 0) { mode.setTitle(getListView().getCheckedItemCount() + " " + getString(R.string.selected)); // Force actions' refresh mode.invalidate(); } } }); getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { return new CursorLoader(getActivity(), BookmarkProvider.CONTENT_URI, null, null, null, null); } public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) { ((BookmarkListAdapter) getListAdapter()).swapCursor(cursor); setLoading(false); } public void onLoaderReset(Loader<Cursor> loader) { ((BookmarkListAdapter) getListAdapter()).swapCursor(null); setLoading(false); } public static interface BookmarkContract { void onBookmarkSelected(String path); void showBookmarks(); } }