com.bobomee.android.recyclerviewhelperdemo.fragment.FastScrollFragment.java Source code

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Here is the source code for com.bobomee.android.recyclerviewhelperdemo.fragment.FastScrollFragment.java

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/*
 * Copyright (C) 2016.  BoBoMEe(wbwjx115@gmail.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.bobomee.android.recyclerviewhelperdemo.fragment;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewCompat;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.bobomee.android.recyclerviewhelper.fastscroll.RecyclerFastScroller;
import com.bobomee.android.recyclerviewhelper.fastscroll.interfaces.OnScrollStateChange;
import com.bobomee.android.recyclerviewhelper.smoothlayout.SmoothScrollStaggeredLayoutManager;
import com.bobomee.android.recyclerviewhelperdemo.R;
import com.bobomee.android.recyclerviewhelperdemo.recycler.BaseRecyclerAdapter;
import com.bobomee.android.recyclerviewhelperdemo.recycler.RecyclerViewHolder;
import java.util.ArrayList;
import java.util.List;

/**
 * Created on 2016/12/27.?11:21.
 *
 * @author bobomee.
 */

public class FastScrollFragment extends Fragment implements OnScrollStateChange.OnScrollStateChangeListener {

    private RecyclerView mRecyclerView;
    private FloatingActionButton mFloatingActionButton;
    Activity mActivity;
    private BaseRecyclerAdapter<String> mItemAdapter;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
            @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_fast_scroll, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler);

        mFloatingActionButton = (FloatingActionButton) view.findViewById(R.id.fab);

        mRecyclerView.setLayoutManager(
                new SmoothScrollStaggeredLayoutManager(mActivity, 2, StaggeredGridLayoutManager.VERTICAL));
        mRecyclerView.setAdapter(mItemAdapter);

        RecyclerFastScroller fastScroller = (RecyclerFastScroller) view.findViewById(R.id.fast_scroller);
        fastScroller.setBubbleTextCreator(mItemAdapter);

        fastScroller.setRecyclerView(mRecyclerView);
        fastScroller.addOnScrollStateChangeListener(this);

        int color = getColorAccent(mActivity);
        fastScroller.setAccentColor(color);

        mFloatingActionButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mRecyclerView.smoothScrollToPosition(0);
            }
        });
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public static int getColorAccent(Context context) {
        int accentAttr = android.R.attr.colorAccent;
        TypedArray androidAttr = context.getTheme().obtainStyledAttributes(new int[] { accentAttr });
        int colorAccent = androidAttr.getColor(0, 0xFF009688); //Default: material_deep_teal_500
        androidAttr.recycle();
        return colorAccent;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mActivity = getActivity();

        prepareData();

        mItemAdapter = new BaseRecyclerAdapter<String>(mDatas, mActivity) {
            @Override
            public void bindData(RecyclerViewHolder holder, int position, String item) {
                holder.setText(R.id.tvItemName, item);
            }

            @Override
            public int getItemLayoutId(int viewType) {
                return R.layout.item_adapter;
            }

            @Override
            public String onCreateBubbleText(int pos) {
                return String.valueOf(pos);
            }
        };
    }

    private List<String> mDatas = new ArrayList<>();

    private void prepareData() {

        for (int i = 0; i < 50; ++i) {

            mDatas.add(i + "");
        }
    }

    @Override
    public void onFastScrollerStateChange(boolean scrolling) {
        if (scrolling) {
            hideFab();
        } else {
            showFab();
        }
    }

    private void hideFab() {
        ViewCompat.animate(mFloatingActionButton).scaleX(0f).scaleY(0f).alpha(0f).setDuration(100).start();
    }

    private void showFab() {
        ViewCompat.animate(mFloatingActionButton).scaleX(1f).scaleY(1f).alpha(1f).setDuration(200)
                .setStartDelay(300L).start();
    }
}