【Android(安卓)- 框架】之可悬浮列表StickyHeadersRecyclerView

这是timehop的GitHub上发表的一个控件框架，大家可以去参考它的【GitHub】。

这里先贴出GitHub上提供的效果图：

要使用这个框架，我们需要首先导入它的依赖：

compile 'com.timehop.stickyheadersrecyclerview:library:0.4.3'compile 'com.android.support:recyclerview-v7:24.0.0'

这里需要说明的是，这个框架要求SDK的最小版本不能低于14；另外，这个框架在2016年4月之后就不再更新维护了。

下面让我们来看一下它的使用方式：

（1）在布局文件中，我们仍然使用RecyclerView：

<?xml version="1.0" encoding="utf-8"?>

（2）MainActivity中的代码如下：

package com.example.itgungnir.teststickyheadersrecyclerview;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import android.widget.Toast;import com.timehop.stickyheadersrecyclerview.StickyRecyclerHeadersAdapter;import com.timehop.stickyheadersrecyclerview.StickyRecyclerHeadersDecoration;import com.timehop.stickyheadersrecyclerview.StickyRecyclerHeadersTouchListener;public class MainActivity extends AppCompatActivity {    private RecyclerView rv;    private AnimalsHeadersAdapter adapter;    private StickyRecyclerHeadersDecoration headersDecor;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        rv = (RecyclerView) findViewById(R.id.rv);    }    @Override    protected void onResume() {        super.onResume();        initView();        initEvent();    }    private void initView() {        // 为RecyclerView设置适配器        adapter = new AnimalsHeadersAdapter();        adapter.addAll(getDummyDataSet());        rv.setAdapter(adapter);        // 为RecyclerView添加LayoutManager        final LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);        rv.setLayoutManager(layoutManager);        // 为RecyclerView添加Decorator装饰器        // 为RecyclerView中的Item添加Header头部（自动获取头部ID，将相邻的ID相同的聚合到一起形成一个Header）        headersDecor = new StickyRecyclerHeadersDecoration(adapter);        rv.addItemDecoration(headersDecor);        // 为RecyclerView添加Item之间的分隔线        rv.addItemDecoration(new DividerDecoration(this));    }    private void initEvent() {        // 为RecyclerView添加普通Item的点击事件（点击Header无效）        rv.addOnItemTouchListener(new RecyclerItemClickListener(this, new RecyclerItemClickListener.OnItemClickListener() {            @Override            public void onItemClick(View view, int position) {                Toast.makeText(MainActivity.this, adapter.getItem(position) + " Clicked", Toast.LENGTH_SHORT).show();            }        }));        // 为RecyclerView添加Header的点击事件        StickyRecyclerHeadersTouchListener touchListener = new StickyRecyclerHeadersTouchListener(rv, headersDecor);        touchListener.setOnHeaderClickListener(new StickyRecyclerHeadersTouchListener.OnHeaderClickListener() {            @Override            public void onHeaderClick(View header, int position, final long headerId) {                Toast.makeText(MainActivity.this, "Header position: " + position + ", id: " + headerId, Toast.LENGTH_SHORT).show();            }        });        rv.addOnItemTouchListener(touchListener);    }    // 获取RecyclerView中展示的数据源    private String[] getDummyDataSet() {        return getResources().getStringArray(R.array.animals);    }    // StickyHeadersRecyclerView的适配器类    private class AnimalsHeadersAdapter extends AnimalAdapter implements StickyRecyclerHeadersAdapter {        @Override        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.listitem_normal, parent, false);            return new RecyclerView.ViewHolder(view) {            };        }        @Override        public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {            TextView textView = (TextView) holder.itemView;            textView.setText(getItem(position));        }        // 获取当前Item的首字母，按照首字母将相邻的Item聚集起来并添加统一的头部        @Override        public long getHeaderId(int position) {            return getItem(position).charAt(0);        }        // 获取头部布局        @Override        public RecyclerView.ViewHolder onCreateHeaderViewHolder(ViewGroup parent) {            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.listitem_header, parent, false);            return new RecyclerView.ViewHolder(view) {            };        }        // 为头部布局中的控件绑定数据        @Override        public void onBindHeaderViewHolder(RecyclerView.ViewHolder holder, int position) {            final TextView textView = (TextView) holder.itemView;            textView.setText(String.valueOf(getItem(position).charAt(0)));        }    }}

（3）AnimalAdapter类中的代码：

import android.support.v7.widget.RecyclerView;import java.util.ArrayList;import java.util.Arrays;import java.util.Collection;/** * RecyclerView的适配器 */public abstract class AnimalAdapter extends RecyclerView.Adapter {    private ArrayList items = new ArrayList();    public AnimalAdapter() {        setHasStableIds(true);    }    public void add(String object) {        items.add(object);        notifyDataSetChanged();    }    public void add(int index, String object) {        items.add(index, object);        notifyDataSetChanged();    }    public void addAll(Collection<? extends String> collection) {        if (collection != null) {            items.addAll(collection);            notifyDataSetChanged();        }    }    public void addAll(String... items) {        addAll(Arrays.asList(items));    }    public void clear() {        items.clear();        notifyDataSetChanged();    }    public void remove(String object) {        items.remove(object);        notifyDataSetChanged();    }    public String getItem(int position) {        return items.get(position);    }    @Override    public long getItemId(int position) {        return getItem(position).hashCode();    }    @Override    public int getItemCount() {        return items.size();    }}

（4）RecyclerItemClickListener类中的代码：

import android.content.Context;import android.support.v7.widget.RecyclerView;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.View;public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener {    private OnItemClickListener mListener;    private GestureDetector mGestureDetector;    public RecyclerItemClickListener(Context context, OnItemClickListener listener) {        mListener = listener;        mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {            @Override            public boolean onSingleTapUp(MotionEvent e) {                return true;            }        });    }    @Override    public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {        View childView = view.findChildViewUnder(e.getX(), e.getY());        if (childView != null && mListener != null && mGestureDetector.onTouchEvent(e)) {            mListener.onItemClick(childView, view.getChildAdapterPosition(childView));        }        return false;    }    @Override    public void onTouchEvent(RecyclerView view, MotionEvent motionEvent) {    }    @Override    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {        // do nothing    }    public interface OnItemClickListener {        void onItemClick(View view, int position);    }}

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