com.h6ah4i.android.example.advrecyclerview.demo_e_already_expanded.AlreadyExpandedGroupsExpandableExampleFragment.java Source code

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Here is the source code for com.h6ah4i.android.example.advrecyclerview.demo_e_already_expanded.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.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.content.ContextCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
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;

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(LayoutInflater inflater, @Nullable ViewGroup container,
            @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_recycler_list_view, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        //noinspection ConstantConditions
        mRecyclerView = (RecyclerView) getView().findViewById(R.id.recycler_view);
        mLayoutManager = new LinearLayoutManager(getContext());

        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.
        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(getContext(), R.drawable.material_shadow_z1)));
        }
        mRecyclerView.addItemDecoration(new SimpleListDividerDecorator(
                ContextCompat.getDrawable(getContext(), R.drawable.list_divider_h), true));

        mRecyclerViewExpandableItemManager.attachRecyclerView(mRecyclerView);
    }

    @Override
    public void onSaveInstanceState(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();
    }
}