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AlreadyExpandedGroupsExpandableExampleFragment.java
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AlreadyExpandedGroupsExpandableExampleFragment.java
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/*
* Copyright (C) 2015 Haruki Hasegawa
*
* 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.h6ah4i.android.example.advrecyclerview.demo_e_already_expanded;
import android.graphics.drawable.NinePatchDrawable;
import android.os.Build;
import android.os.Bundle;
import android.os.Parcelable;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import com.h6ah4i.android.example.advrecyclerview.R;
import com.h6ah4i.android.example.advrecyclerview.common.data.AbstractAddRemoveExpandableDataProvider;
import com.h6ah4i.android.widget.advrecyclerview.animator.GeneralItemAnimator;
import com.h6ah4i.android.widget.advrecyclerview.animator.RefactoredDefaultItemAnimator;
import com.h6ah4i.android.widget.advrecyclerview.decoration.ItemShadowDecorator;
import com.h6ah4i.android.widget.advrecyclerview.decoration.SimpleListDividerDecorator;
import com.h6ah4i.android.widget.advrecyclerview.expandable.RecyclerViewExpandableItemManager;
import com.h6ah4i.android.widget.advrecyclerview.utils.WrapperAdapterUtils;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
public class AlreadyExpandedGroupsExpandableExampleFragment extends Fragment {
private static final String SAVED_STATE_EXPANDABLE_ITEM_MANAGER = "RecyclerViewExpandableItemManager";
private RecyclerView mRecyclerView;
private RecyclerView.LayoutManager mLayoutManager;
private AlreadyExpandedGroupsExpandableExampleAdapter mAdapter;
private RecyclerView.Adapter mWrappedAdapter;
private RecyclerViewExpandableItemManager mRecyclerViewExpandableItemManager;
public AlreadyExpandedGroupsExpandableExampleFragment() {
super();
setHasOptionsMenu(true);
}
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_recycler_list_view, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
//noinspection ConstantConditions
mRecyclerView = getView().findViewById(R.id.recycler_view);
mLayoutManager = new LinearLayoutManager(requireContext());
final Parcelable eimSavedState = (savedInstanceState != null) ? savedInstanceState.getParcelable(SAVED_STATE_EXPANDABLE_ITEM_MANAGER) : null;
mRecyclerViewExpandableItemManager = new RecyclerViewExpandableItemManager(eimSavedState);
// Expand all group items by default. This method must be called before creating a wrapper adapter.
//
// FYI: AbstractExpandableItemAdapter.getInitialGroupExpandedState() can also be used if you
// need fine control of initial group items' state.
mRecyclerViewExpandableItemManager.setDefaultGroupsExpandedState(true);
//adapter
final AlreadyExpandedGroupsExpandableExampleAdapter myItemAdapter = new AlreadyExpandedGroupsExpandableExampleAdapter(mRecyclerViewExpandableItemManager, getDataProvider());
mAdapter = myItemAdapter;
mWrappedAdapter = mRecyclerViewExpandableItemManager.createWrappedAdapter(myItemAdapter); // wrap for expanding
final GeneralItemAnimator animator = new RefactoredDefaultItemAnimator();
// Change animations are enabled by default since support-v7-recyclerview v22.
// Need to disable them when using animation indicator.
animator.setSupportsChangeAnimations(false);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setAdapter(mWrappedAdapter); // requires *wrapped* adapter
mRecyclerView.setItemAnimator(animator);
mRecyclerView.setHasFixedSize(false);
// additional decorations
//noinspection StatementWithEmptyBody
if (supportsViewElevation()) {
// Lollipop or later has native drop shadow feature. ItemShadowDecorator is not required.
} else {
mRecyclerView.addItemDecoration(new ItemShadowDecorator((NinePatchDrawable) ContextCompat.getDrawable(requireContext(), R.drawable.material_shadow_z1)));
}
mRecyclerView.addItemDecoration(new SimpleListDividerDecorator(ContextCompat.getDrawable(requireContext(), R.drawable.list_divider_h), true));
mRecyclerViewExpandableItemManager.attachRecyclerView(mRecyclerView);
}
@Override
public void onSaveInstanceState(@NonNull Bundle outState) {
super.onSaveInstanceState(outState);
// save current state to support screen rotation, etc...
if (mRecyclerViewExpandableItemManager != null) {
outState.putParcelable(
SAVED_STATE_EXPANDABLE_ITEM_MANAGER,
mRecyclerViewExpandableItemManager.getSavedState());
}
}
@Override
public void onDestroyView() {
if (mRecyclerViewExpandableItemManager != null) {
mRecyclerViewExpandableItemManager.release();
mRecyclerViewExpandableItemManager = null;
}
if (mRecyclerView != null) {
mRecyclerView.setItemAnimator(null);
mRecyclerView.setAdapter(null);
mRecyclerView = null;
}
if (mWrappedAdapter != null) {
WrapperAdapterUtils.releaseAll(mWrappedAdapter);
mWrappedAdapter = null;
}
mAdapter = null;
mLayoutManager = null;
super.onDestroyView();
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_e_already_expanded, menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_add_group_bottom_2:
mAdapter.addGroupAndChildItemsBottom(2, 3);
return true;
case R.id.menu_remove_group_bottom_2:
mAdapter.removeGroupItemsBottom(2);
return true;
case R.id.menu_clear_groups:
mAdapter.clearGroupItems();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private boolean supportsViewElevation() {
return (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP);
}
public AbstractAddRemoveExpandableDataProvider getDataProvider() {
return ((AlreadyExpandedGroupsExpandableExampleActivity) getActivity()).getDataProvider();
}
}