Java tutorial
/* * Copyright (C) 2014. * * BaasBox - info@baasbox.com * * 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.baasbox.android.samples.aloa.activities; import android.app.Activity; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.support.v4.app.LoaderManager; import android.support.v4.content.Loader; 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 com.baasbox.android.BaasResult; import com.baasbox.android.BaasUser; import com.baasbox.android.samples.aloa.Data; import com.baasbox.android.samples.aloa.R; import com.baasbox.android.samples.aloa.activities.loaders.BaasUsersLoader; import com.baasbox.android.samples.aloa.activities.loaders.ChannelsLoader; import java.util.List; /** * A fragment representing a list of Items. * <p /> * Large screen devices (such as tablets) are supported by replacing the ListView * with a GridView. * <p /> * interface. */ public class SendTargetFragment extends Fragment implements AbsListView.OnItemClickListener { // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER private static final String ITEMS_TYPE = "items_type"; private boolean mForChannels = false; private OnTargetSelectedListener mListener; /** * The fragment's ListView/GridView. */ private AbsListView mListView; private UserAdapter mUserAdapter; private ChannelsAdapter mChannelsAdapter; public static SendTargetFragment newInstance(boolean showChannels) { SendTargetFragment fragment = new SendTargetFragment(); Bundle args = new Bundle(); args.putBoolean(ITEMS_TYPE, showChannels); fragment.setArguments(args); return fragment; } /** * Mandatory empty constructor for the fragment manager to instantiate the * fragment (e.g. upon screen orientation changes). */ public SendTargetFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments() != null) { mForChannels = getArguments().getBoolean(ITEMS_TYPE, false); } if (mForChannels) { mChannelsAdapter = new ChannelsAdapter(); } else { mUserAdapter = new UserAdapter(); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_sendtarget, container, false); // Set the adapter mListView = (AbsListView) view.findViewById(android.R.id.list); ((AdapterView<ListAdapter>) mListView).setAdapter(mForChannels ? mChannelsAdapter : mUserAdapter); // Set OnItemClickListener so we can be notified on item clicks mListView.setOnItemClickListener(this); return view; } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); if (mForChannels) { getLoaderManager().initLoader(R.id.LOAD_CHANNELS, null, mChannelsAdapter); } else { getLoaderManager().initLoader(R.id.LOAD_USERS, null, mUserAdapter); } } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { mListener = (OnTargetSelectedListener) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnFragmentInteractionListener"); } } @Override public void onDetach() { super.onDetach(); mListener = null; } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { if (null != mListener) { if (mForChannels) { String item = mChannelsAdapter.getItem(position); mListener.onTargetSelected(item, true); } else { String user = mUserAdapter.getItem(position).getName(); mListener.onTargetSelected(user, false); } } } /** * 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(CharSequence emptyText) { View emptyView = mListView.getEmptyView(); if (emptyText instanceof TextView) { ((TextView) emptyView).setText(emptyText); } } protected interface SimpleAdapter<T> extends ListAdapter { @Override public abstract T getItem(int position); public abstract void swap(List<T> data); } private class ChannelsAdapter extends BaseAdapter implements SimpleAdapter<String>, LoaderManager.LoaderCallbacks<BaasResult<List<String>>> { private List<String> channels; private final LayoutInflater fInflater; ChannelsAdapter() { fInflater = LayoutInflater.from(getActivity()); } @Override public int getCount() { return channels == null ? 0 : channels.size(); } @Override public String getItem(int position) { return channels.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = fInflater.inflate(android.R.layout.simple_list_item_1, parent, false); } TextView channel = (TextView) convertView.findViewById(android.R.id.text1); channel.setText(getItem(position)); return convertView; } @Override public void swap(List<String> data) { channels = data; notifyDataSetChanged(); } @Override public Loader<BaasResult<List<String>>> onCreateLoader(int i, Bundle bundle) { return new ChannelsLoader(getActivity()); } @Override public void onLoadFinished(Loader<BaasResult<List<String>>> loader, BaasResult<List<String>> data) { if (data.isSuccess()) { swap(data.value()); } } @Override public void onLoaderReset(Loader<BaasResult<List<String>>> baasResultLoader) { } } private class UserAdapter extends BaseAdapter implements SimpleAdapter<BaasUser>, LoaderManager.LoaderCallbacks<BaasResult<List<BaasUser>>> { private List<BaasUser> mUsers; private final LayoutInflater fInflater; @Override public Loader<BaasResult<List<BaasUser>>> onCreateLoader(int i, Bundle bundle) { return new BaasUsersLoader(getActivity()); } @Override public void onLoadFinished(Loader<BaasResult<List<BaasUser>>> loader, BaasResult<List<BaasUser>> result) { if (result.isSuccess()) { swap(result.value()); } } @Override public void onLoaderReset(Loader<BaasResult<List<BaasUser>>> objectLoader) { } UserAdapter() { fInflater = LayoutInflater.from(getActivity()); } public void swap(List<BaasUser> users) { this.mUsers = users; notifyDataSetChanged(); } @Override public int getCount() { return mUsers == null ? 0 : mUsers.size(); } @Override public BaasUser getItem(int position) { return mUsers.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = fInflater.inflate(android.R.layout.simple_list_item_2, parent, false); } TextView nameView = (TextView) convertView.findViewById(android.R.id.text1); TextView flowerView = (TextView) convertView.findViewById(android.R.id.text2); BaasUser user = getItem(position); String name = user.getName(); String flower = user.getScope(BaasUser.Scope.PUBLIC).getString(Data.FLOWERS); nameView.setText(name); flowerView.setText(flower); return convertView; } } }