Java tutorial
/* * Copyright (C) 2012-2016 The Android Money Manager Ex Project Team * * 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.money.manager.ex.common; import android.os.Bundle; import android.os.Handler; import android.support.v4.app.Fragment; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnCreateContextMenuListener; import android.view.ViewGroup; import android.view.animation.AnimationUtils; import android.widget.AdapterView; import android.widget.ExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.ScrollView; import android.widget.TextView; import com.money.manager.ex.R; /** * This class has originally been taken from * http://stackoverflow.com/questions/6051050/expandablelistfragment-with-loadermanager-for-compatibility-package * and then modified by Manfred Moser <manfred@simpligility.com> to get it to work with the v4 r4 compatibility * library. With inspirations from the library source. * * All ASLv2 licensed. */ public class ExpandableListFragment extends Fragment implements OnCreateContextMenuListener, ExpandableListView.OnChildClickListener, ExpandableListView.OnGroupCollapseListener, ExpandableListView.OnGroupExpandListener { static final int INTERNAL_EMPTY_ID = 0x00ff0001; static final int INTERNAL_LIST_CONTAINER_ID = 0x00ff0003; final private Handler mHandler = new Handler(); final private Runnable mRequestFocus = new Runnable() { public void run() { mList.focusableViewAvailable(mList); } }; final private AdapterView.OnItemClickListener mOnClickListener = new AdapterView.OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View v, int position, long id) { onListItemClick((ListView) parent, v, position, id); } }; ExpandableListAdapter mAdapter; ExpandableListView mList; View mEmptyView; ScrollView mEmptyViewScroll; TextView mStandardEmptyView; CharSequence mEmptyText; View mListContainer; boolean mEmptyTextSet; boolean mListShown; boolean mFinishedStart = false; public ExpandableListFragment() { } /** * Provide default implementation to return a simple list view. Subclasses * can override to replace with their own layout. If doing so, the * returned view hierarchy <em>must</em> have a ListView whose id * is {@link android.R.id#list android.R.id.list} and can optionally * have a sibling view id {@link android.R.id#empty android.R.id.empty} * that is to be shown when the list is empty. * <p/> * <p>If you are overriding this method with your own custom content, * consider including the standard layout {@link android.R.layout#list_content} * in your layout file, so that you continue to retain all of the standard * behavior of ListFragment. In particular, this is currently the only * way to have the built-in indeterminant progress state be shown. */ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.expandable_list_fragment, container, false); // FrameLayout root = new FrameLayout(getActivity()); // // FrameLayout lframe = new FrameLayout(getActivity()); // lframe.setId(INTERNAL_LIST_CONTAINER_ID); // // TextView tv = new TextView(getActivity()); // tv.setId(INTERNAL_EMPTY_ID); // tv.setGravity(Gravity.CENTER); // lframe.addView(tv, // new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); // // ExpandableListView lv = new ExpandableListView(getActivity()); // lv.setId(android.R.id.list); // lv.setDrawSelectorOnTop(false); // lframe.addView(lv, // new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); // // root.addView(lframe, new FrameLayout.LayoutParams( // ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); // // ListView.LayoutParams lp = // new ListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); // root.setLayoutParams(lp); // // return root; } /** * Attach to list view once the view hierarchy has been created. */ @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); ensureList(); } /** Detach from list view. */ @Override public void onDestroyView() { mHandler.removeCallbacks(mRequestFocus); mList = null; super.onDestroyView(); } /** * This method will be called when an item in the list is selected. * Subclasses should override. Subclasses can call * getListView().getItemAtPosition(position) if they need to access the * data associated with the selected item. * @param l The ListView where the click happened * @param v The view that was clicked within the ListView * @param position The position of the view in the list * @param id The row id of the item that was clicked */ public void onListItemClick(ListView l, View v, int position, long id) { } /** Provide the cursor for the list view. */ public void setListAdapter(ExpandableListAdapter adapter) { boolean hadAdapter = mAdapter != null; mAdapter = adapter; if (mList != null) { mList.setAdapter(adapter); if (!mListShown && !hadAdapter) { // The list was hidden, and previously didn't have an // adapter. It is now time to show it. setListShown(true, getView().getWindowToken() != null); } } } /** * Set the currently selected list item to the specified * position with the adapter's data */ public void setSelection(int position) { ensureList(); mList.setSelection(position); } public long getSelectedPosition() { ensureList(); return mList.getSelectedPosition(); } public long getSelectedId() { ensureList(); return mList.getSelectedId(); } public ExpandableListView getExpandableListView() { ensureList(); return mList; } /** * The default content for a ListFragment has a TextView that can * be shown when the list is empty. If you would like to have it * shown, call this method to supply the text it should use. */ public void setEmptyText(CharSequence text) { ensureList(); if (mStandardEmptyView == null) { throw new IllegalStateException("Can't be used with a custom content view"); } mStandardEmptyView.setText(text); if (mEmptyText == null) { mList.setEmptyView(mEmptyViewScroll); } mEmptyText = text; // if (!mEmptyTextSet) { // mList.setEmptyView(mStandardEmptyView); // mEmptyTextSet = true; // } } /** * Control whether the list is being displayed. You can make it not * displayed if you are waiting for the initial data to show in it. During * this time an indeterminant progress indicator will be shown instead. * <p/> * <p>Applications do not normally need to use this themselves. The default * behavior of ListFragment is to start with the list not being shown, only * showing it once an adapter is given with {@link #setListAdapter(ListAdapter)}. * If the list at that point had not been shown, when it does get shown * it will be do without the user ever seeing the hidden state. * @param shown If true, the list view is shown; if false, the progress * indicator. The initial value is true. */ public void setListShown(boolean shown) { setListShown(shown, true); } /** * Like {@link #setListShown(boolean)}, but no animation is used when * transitioning from the previous state. */ public void setListShownNoAnimation(boolean shown) { setListShown(shown, false); } /** * Control whether the list is being displayed. You can make it not * displayed if you are waiting for the initial data to show in it. During * this time an indeterminant progress indicator will be shown instead. * @param shown If true, the list view is shown; if false, the progress * indicator. The initial value is true. * @param animate If true, an animation will be used to transition to the * new state. */ private void setListShown(boolean shown, boolean animate) { ensureList(); if (mListShown == shown) { return; } mListShown = shown; if (mListContainer != null) { if (shown) { if (animate) { mListContainer .startAnimation(AnimationUtils.loadAnimation(getActivity(), android.R.anim.fade_in)); } mListContainer.setVisibility(View.VISIBLE); } else { if (animate) { mListContainer .startAnimation(AnimationUtils.loadAnimation(getActivity(), android.R.anim.fade_out)); } mListContainer.setVisibility(View.GONE); } } } /** Get the ListAdapter associated with this activity's ListView. */ public ExpandableListAdapter getExpandableListAdapter() { return mAdapter; } private void ensureList() { if (mList != null) return; View root = getView(); if (root == null) { throw new IllegalStateException("Content view not yet created"); } if (root instanceof ExpandableListView) { mList = (ExpandableListView) root; } else { mEmptyViewScroll = (ScrollView) root.findViewById(R.id.emptyViewScroll); // mStandardEmptyView = (TextView) root.findViewById(R.id.empty); mStandardEmptyView = (TextView) root.findViewById(android.R.id.empty); if (mStandardEmptyView == null) { mEmptyView = root.findViewById(android.R.id.empty); } else { mEmptyViewScroll.setVisibility(View.GONE); } mListContainer = root.findViewById(R.id.container); View rawListView = root.findViewById(android.R.id.list); if (!(rawListView instanceof ExpandableListView)) { if (rawListView == null) { throw new RuntimeException("Your content must have a ExpandableListView whose id attribute is " + "'android.R.id.list'"); } throw new RuntimeException("Content has view with id attribute 'android.R.id.list' " + "that is not a ExpandableListView class"); } mList = (ExpandableListView) rawListView; if (mEmptyView != null) { // mList.setEmptyView(mEmptyView); mList.setEmptyView(mEmptyViewScroll); } else if (mEmptyTextSet) { mStandardEmptyView.setText(mEmptyText); mList.setEmptyView(mEmptyViewScroll); } } mListShown = true; mList.setOnItemClickListener(mOnClickListener); if (mAdapter != null) { setListAdapter(mAdapter); } else { // We are starting without an adapter, so assume we won't // have our data right away and start with the progress indicator. setListShown(false, false); } mHandler.post(mRequestFocus); } @Override public void onGroupExpand(int arg0) { // TODO Auto-generated method stub } @Override public void onGroupCollapse(int arg0) { // TODO Auto-generated method stub } @Override public boolean onChildClick(ExpandableListView arg0, View arg1, int arg2, int arg3, long arg4) { // TODO Auto-generated method stub return false; } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { } public void onContentChanged() { View emptyView = getView().findViewById(android.R.id.empty); mList = (ExpandableListView) getView().findViewById(android.R.id.list); if (mList == null) { throw new RuntimeException( "Your content must have a ExpandableListView whose id attribute is " + "'android.R.id.list'"); } if (emptyView != null) { mList.setEmptyView(emptyView); } mList.setOnChildClickListener(this); mList.setOnGroupExpandListener(this); mList.setOnGroupCollapseListener(this); if (mFinishedStart) { setListAdapter(mAdapter); } mFinishedStart = true; } }