Java tutorial
/* * Copyright (c) 2014 Rex St. John on behalf of AirPair.com * * 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: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * 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 com.fitgoose.fitgoosedemo; //import android.app.LoaderManager; //import android.content.Loader; import android.support.v4.app.LoaderManager; //import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; //import android.support.v4.widget.CursorAdapter; import android.app.Activity; import android.app.ProgressDialog; import android.content.Context; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.ListAdapter; import android.widget.TextView; import android.support.v4.app.Fragment; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import com.fitgoose.fitgoosedemo.R; //import com.ultimate.camera.R; import com.fitgoose.fitgoosedemo.camera_utilities.PhotoAdapter; import com.fitgoose.fitgoosedemo.camera_utilities.PhotoGalleryAsyncLoader; import com.fitgoose.fitgoosedemo.camera_utilities.PhotoItem; import com.fitgoose.fitgoosedemo.plan_tab.BaseFragment; /** * This is an example which will load all the images on your phone into a grid using a background * image AsyncLoader. * * Reference: http://developer.android.com/reference/android/content/AsyncTaskLoader.html * * Created by Rex St. John (on behalf of AirPair.com) on 3/4/14. */ public class SimplePhotoGalleryListFragment extends BaseFragment implements AbsListView.OnItemClickListener, LoaderManager.LoaderCallbacks<List<PhotoItem>> { // Ivars. protected OnFragmentInteractionListener mListener; protected AbsListView mListView; protected PhotoAdapter mAdapter; protected ArrayList<PhotoItem> mPhotoListItem; protected TextView mEmptyTextView; protected ProgressDialog mLoadingProgressDialog; /** * Required empty constructor */ public SimplePhotoGalleryListFragment() { super(); } /** * Static factory method * @param sectionNumber * @return */ public static SimplePhotoGalleryListFragment newInstance(int sectionNumber) { SimplePhotoGalleryListFragment fragment = new SimplePhotoGalleryListFragment(); Bundle args = new Bundle(); args.putInt(ARG_SECTION_NUMBER, sectionNumber); fragment.setArguments(args); return fragment; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Create an empty loader and pre-initialize the photo list items as an empty list. Context context = getActivity().getBaseContext(); // Set up empty mAdapter mPhotoListItem = new ArrayList<PhotoItem>(); mAdapter = new PhotoAdapter(context, R.layout.photo_item, mPhotoListItem, false); // Prepare the loader. Either re-connect with an existing one, // or start a new one. getLoaderManager().initLoader(0, null, this); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = null; view = inflater.inflate(R.layout.fragment_photo_gallery, container, false); // Set the mAdapter mListView = (AbsListView) view.findViewById(android.R.id.list); ((AdapterView<ListAdapter>) mListView).setAdapter(mAdapter); mEmptyTextView = (TextView) view.findViewById(R.id.empty); // Show the empty text / message. resolveEmptyText(); // Set OnItemClickListener so we can be notified on item clicks mListView.setOnItemClickListener(this); return view; } /** * Used to show a generic empty text warning. Override in inheriting classes. */ protected void resolveEmptyText() { if (mAdapter.isEmpty()) { mEmptyTextView.setVisibility(View.VISIBLE); setEmptyText(); } else { mEmptyTextView.setVisibility(View.INVISIBLE); } } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { mListener = (OnFragmentInteractionListener) activity; // Show a progress dialog. mLoadingProgressDialog = new ProgressDialog(getActivity()); mLoadingProgressDialog.setMessage("Loading Photos..."); mLoadingProgressDialog.setCancelable(true); mLoadingProgressDialog.show(); } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnFragmentInteractionListener"); } } @Override public void onDetach() { super.onDetach(); mListener = null; cancelProgressDialog(); } @Override public void onPause() { super.onPause(); cancelProgressDialog(); } @Override public void onStop() { super.onStop(); cancelProgressDialog(); } /** * This is only triggered when the user selects a single photo. * @param parent * @param view * @param position * @param id */ @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { if (null != mListener) { // Tell the share builder to add the photo to the share operation. PhotoItem photoListItem = (PhotoItem) this.mAdapter.getItem(position); String imagePath = photoListItem.getThumbnailUri().getPath(); mListener.onFragmentInteraction(0); //MainActivity.SELECT_PHOTO_ACTION=0 resetFragmentState(); } } /** * Used when hitting the back button to reset the mFragment UI state */ protected void resetFragmentState() { // Clear view state getActivity().invalidateOptionsMenu(); ((BaseAdapter) mListView.getAdapter()).notifyDataSetChanged(); } /** * The default content for this Fragment has a TextView that is shown when * the list is empty. If you would like to change the text, call this method * to supply the text it should use. */ public void setEmptyText() { mEmptyTextView.setText("No Photos!"); } /** * Loader Handlers for loading the photos in the background. */ @Override public Loader<List<PhotoItem>> onCreateLoader(int id, Bundle args) { // This is called when a new Loader needs to be created. This // sample only has one Loader with no arguments, so it is simple. return new PhotoGalleryAsyncLoader(getActivity()); } @Override public void onLoadFinished(Loader<List<PhotoItem>> loader, List<PhotoItem> data) { // Set the new data in the mAdapter. mPhotoListItem.clear(); for (int i = 0; i < data.size(); i++) { PhotoItem item = data.get(i); mPhotoListItem.add(item); } mAdapter.notifyDataSetChanged(); resolveEmptyText(); cancelProgressDialog(); } @Override public void onLoaderReset(Loader<List<PhotoItem>> loader) { // Clear the data in the mAdapter. mPhotoListItem.clear(); mAdapter.notifyDataSetChanged(); resolveEmptyText(); cancelProgressDialog(); } /** * Save cancel for the progress loader */ private void cancelProgressDialog() { if (mLoadingProgressDialog != null) { if (mLoadingProgressDialog.isShowing()) { mLoadingProgressDialog.cancel(); } } } }