羊皮书APP（Android版）开发系列（二十一）双联动分组ListView，类似于外卖点餐

package cn.studyou.doublelistviewlinkage.View;

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AdapterView;
import android.widget.HeaderViewListAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;

import cn.studyou.doublelistviewlinkage.Adapter.SectionedBaseAdapter;

public class PinnedHeaderListView extends ListView implements OnScrollListener {

    private OnScrollListener mOnScrollListener;

    public static interface PinnedSectionedHeaderAdapter {
        public boolean isSectionHeader(int position);

        public int getSectionForPosition(int position);

        public View getSectionHeaderView(int section, View convertView, ViewGroup parent);

        public int getSectionHeaderViewType(int section);

        public int getCount();

    }

    private PinnedSectionedHeaderAdapter mAdapter;
    private View mCurrentHeader;
    private int mCurrentHeaderViewType = 0;
    private float mHeaderOffset;
    private boolean mShouldPin = true;
    private int mCurrentSection = 0;
    private int mWidthMode;
    private int mHeightMode;

    public PinnedHeaderListView(Context context) {
        super(context);
        super.setOnScrollListener(this);
    }

    public PinnedHeaderListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        super.setOnScrollListener(this);
    }

    public PinnedHeaderListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        super.setOnScrollListener(this);
    }

    public void setPinHeaders(boolean shouldPin) {
        mShouldPin = shouldPin;
    }

    @Override
    public void setAdapter(ListAdapter adapter) {
        mCurrentHeader = null;
        mAdapter = (PinnedSectionedHeaderAdapter) adapter;
        super.setAdapter(adapter);
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
        if (mOnScrollListener != null) {
            mOnScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
        }

        if (mAdapter == null || mAdapter.getCount() == 0 || !mShouldPin || (firstVisibleItem < getHeaderViewsCount())) {
            mCurrentHeader = null;
            mHeaderOffset = 0.0f;
            for (int i = firstVisibleItem; i < firstVisibleItem + visibleItemCount; i++) {
                View header = getChildAt(i);
                if (header != null) {
                    header.setVisibility(VISIBLE);
                }
            }
            return;
        }

        firstVisibleItem -= getHeaderViewsCount();

        int section = mAdapter.getSectionForPosition(firstVisibleItem);
        int viewType = mAdapter.getSectionHeaderViewType(section);
        mCurrentHeader = getSectionHeaderView(section, mCurrentHeaderViewType != viewType ? null : mCurrentHeader);
        ensurePinnedHeaderLayout(mCurrentHeader);
        mCurrentHeaderViewType = viewType;

        mHeaderOffset = 0.0f;

        for (int i = firstVisibleItem; i < firstVisibleItem + visibleItemCount; i++) {
            if (mAdapter.isSectionHeader(i)) {
                View header = getChildAt(i - firstVisibleItem);
                float headerTop = header.getTop();
                float pinnedHeaderHeight = mCurrentHeader.getMeasuredHeight();
                header.setVisibility(VISIBLE);
                if (pinnedHeaderHeight >= headerTop && headerTop > 0) {
                    mHeaderOffset = headerTop - header.getHeight();
                } else if (headerTop <= 0) {
                    header.setVisibility(INVISIBLE);
                }
            }
        }

        invalidate();
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        if (mOnScrollListener != null) {
            mOnScrollListener.onScrollStateChanged(view, scrollState);
        }
    }

    private View getSectionHeaderView(int section, View oldView) {
        boolean shouldLayout = section != mCurrentSection || oldView == null;

        View view = mAdapter.getSectionHeaderView(section, oldView, this);
        if (shouldLayout) {
            // a new section, thus a new header. We should lay it out again
            ensurePinnedHeaderLayout(view);
            mCurrentSection = section;
        }
        return view;
    }

    private void ensurePinnedHeaderLayout(View header) {
        if (header.isLayoutRequested()) {
            int widthSpec = MeasureSpec.makeMeasureSpec(getMeasuredWidth(), mWidthMode);

            int heightSpec;
            ViewGroup.LayoutParams layoutParams = header.getLayoutParams();
            if (layoutParams != null && layoutParams.height > 0) {
                heightSpec = MeasureSpec.makeMeasureSpec(layoutParams.height, MeasureSpec.EXACTLY);
            } else {
                heightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
            }
            header.measure(widthSpec, heightSpec);
            header.layout(0, 0, header.getMeasuredWidth(), header.getMeasuredHeight());
        }
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);
        if (mAdapter == null || !mShouldPin || mCurrentHeader == null)
            return;
        int saveCount = canvas.save();
        canvas.translate(0, mHeaderOffset);
        canvas.clipRect(0, 0, getWidth(), mCurrentHeader.getMeasuredHeight()); // needed
        mCurrentHeader.draw(canvas);
        canvas.restoreToCount(saveCount);
    }

    @Override
    public void setOnScrollListener(OnScrollListener l) {
        mOnScrollListener = l;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        mWidthMode = MeasureSpec.getMode(widthMeasureSpec);
        mHeightMode = MeasureSpec.getMode(heightMeasureSpec);
    }

    public void setOnItemClickListener(OnItemClickListener listener) {
        super.setOnItemClickListener(listener);
    }

    public static abstract class OnItemClickListener implements AdapterView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int rawPosition, long id) {
            SectionedBaseAdapter adapter;
            if (adapterView.getAdapter().getClass().equals(HeaderViewListAdapter.class)) {
                HeaderViewListAdapter wrapperAdapter = (HeaderViewListAdapter) adapterView.getAdapter();
                adapter = (SectionedBaseAdapter) wrapperAdapter.getWrappedAdapter();
            } else {
                adapter = (SectionedBaseAdapter) adapterView.getAdapter();
            }
            int section = adapter.getSectionForPosition(rawPosition);
            int position = adapter.getPositionInSectionForPosition(rawPosition);

            if (position == -1) {
                onSectionClick(adapterView, view, section, id);
            } else {
                onItemClick(adapterView, view, section, position, id);
            }
        }

        public abstract void onItemClick(AdapterView<?> adapterView, View view, int section, int position, long id);

        public abstract void onSectionClick(AdapterView<?> adapterView, View view, int section, long id);

    }
}

package cn.studyou.doublelistviewlinkage.Adapter;

import android.util.SparseArray;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

import cn.studyou.doublelistviewlinkage.View.PinnedHeaderListView;

public abstract class SectionedBaseAdapter extends BaseAdapter implements PinnedHeaderListView.PinnedSectionedHeaderAdapter {

    private static int HEADER_VIEW_TYPE = 0;
    private static int ITEM_VIEW_TYPE = 0;
    private SparseArray<Integer> mSectionPositionCache;
    private SparseArray<Integer> mSectionCache;
    private SparseArray<Integer> mSectionCountCache;
    private int mCount;
    private int mSectionCount;
    public SectionedBaseAdapter() {
        super();
        mSectionCache = new SparseArray<Integer>();
        mSectionPositionCache = new SparseArray<Integer>();
        mSectionCountCache = new SparseArray<Integer>();
        mCount = -1;
        mSectionCount = -1;
    }

    @Override
    public void notifyDataSetChanged() {
        mSectionCache.clear();
        mSectionPositionCache.clear();
        mSectionCountCache.clear();
        mCount = -1;
        mSectionCount = -1;
        super.notifyDataSetChanged();
    }

    @Override
    public void notifyDataSetInvalidated() {
        mSectionCache.clear();
        mSectionPositionCache.clear();
        mSectionCountCache.clear();
        mCount = -1;
        mSectionCount = -1;
        super.notifyDataSetInvalidated();
    }

    @Override
    public final int getCount() {
        if (mCount >= 0) {
            return mCount;
        }
        int count = 0;
        for (int i = 0; i < internalGetSectionCount(); i++) {
            count += internalGetCountForSection(i);
            count++; // for the header view
        }
        mCount = count;
        return count;
    }

    @Override
    public final Object getItem(int position) {
        return getItem(getSectionForPosition(position), getPositionInSectionForPosition(position));
    }

    @Override
    public final long getItemId(int position) {
        return getItemId(getSectionForPosition(position), getPositionInSectionForPosition(position));
    }

    @Override
    public final View getView(int position, View convertView, ViewGroup parent) {
        if (isSectionHeader(position)) {
            return getSectionHeaderView(getSectionForPosition(position), convertView, parent);
        }
        return getItemView(getSectionForPosition(position), getPositionInSectionForPosition(position), convertView, parent);
    }

    @Override
    public final int getItemViewType(int position) {
        if (isSectionHeader(position)) {
            return getItemViewTypeCount() + getSectionHeaderViewType(getSectionForPosition(position));
        }
        return getItemViewType(getSectionForPosition(position), getPositionInSectionForPosition(position));
    }

    @Override
    public final int getViewTypeCount() {
        return getItemViewTypeCount() + getSectionHeaderViewTypeCount();
    }

    public final int getSectionForPosition(int position) {
        // first try to retrieve values from cache
        Integer cachedSection = mSectionCache.get(position);
        if (cachedSection != null) {
            return cachedSection;
        }
        int sectionStart = 0;
        for (int i = 0; i < internalGetSectionCount(); i++) {
            int sectionCount = internalGetCountForSection(i);
            int sectionEnd = sectionStart + sectionCount + 1;
            if (position >= sectionStart && position < sectionEnd) {
                mSectionCache.put(position, i);
                return i;
            }
            sectionStart = sectionEnd;
        }
        return 0;
    }

    public int getPositionInSectionForPosition(int position) {
        // first try to retrieve values from cache
        Integer cachedPosition = mSectionPositionCache.get(position);
        if (cachedPosition != null) {
            return cachedPosition;
        }
        int sectionStart = 0;
        for (int i = 0; i < internalGetSectionCount(); i++) {
            int sectionCount = internalGetCountForSection(i);
            int sectionEnd = sectionStart + sectionCount + 1;
            if (position >= sectionStart && position < sectionEnd) {
                int positionInSection = position - sectionStart - 1;
                mSectionPositionCache.put(position, positionInSection);
                return positionInSection;
            }
            sectionStart = sectionEnd;
        }
        return 0;
    }

    public final boolean isSectionHeader(int position) {
        int sectionStart = 0;
        for (int i = 0; i < internalGetSectionCount(); i++) {
            if (position == sectionStart) {
                return true;
            } else if (position < sectionStart) {
                return false;
            }
            sectionStart += internalGetCountForSection(i) + 1;
        }
        return false;
    }

    public int getItemViewType(int section, int position) {
        return ITEM_VIEW_TYPE;
    }

    public int getItemViewTypeCount() {
        return 1;
    }

    public int getSectionHeaderViewType(int section) {
        return HEADER_VIEW_TYPE;
    }

    public int getSectionHeaderViewTypeCount() {
        return 1;
    }

    public abstract Object getItem(int section, int position);

    public abstract long getItemId(int section, int position);

    public abstract int getSectionCount();

    public abstract int getCountForSection(int section);

    public abstract View getItemView(int section, int position, View convertView, ViewGroup parent);

    public abstract View getSectionHeaderView(int section, View convertView, ViewGroup parent);

    private int internalGetCountForSection(int section) {
        Integer cachedSectionCount = mSectionCountCache.get(section);
        if (cachedSectionCount != null) {
            return cachedSectionCount;
        }
        int sectionCount = getCountForSection(section);
        mSectionCountCache.put(section, sectionCount);
        return sectionCount;
    }

    private int internalGetSectionCount() {
        if (mSectionCount >= 0) {
            return mSectionCount;
        }
        mSectionCount = getSectionCount();
        return mSectionCount;
    }

}

package cn.studyou.doublelistviewlinkage.Activity;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.ListView;

import butterknife.Bind;
import butterknife.ButterKnife;
import cn.studyou.doublelistviewlinkage.Adapter.LeftListAdapter;
import cn.studyou.doublelistviewlinkage.Adapter.MainSectionedAdapter;
import cn.studyou.doublelistviewlinkage.R;
import cn.studyou.doublelistviewlinkage.View.PinnedHeaderListView;

public class MainActivity extends AppCompatActivity {

    @Bind(R.id.left_listview)
    ListView leftListview;
    @Bind(R.id.pinnedListView)
    PinnedHeaderListView pinnedListView;
    private boolean isScroll = true;
    private LeftListAdapter adapter;

    private String[] leftStr = new String[]{"面食类", "盖饭", "寿司", "烧烤", "酒水", "凉菜", "小吃", "粥", "休闲"};
    private boolean[] flagArray = {true, false, false, false, false, false, false, false, false};
    private String[][] rightStr = new String[][]{{"热干面", "臊子面", "烩面"},
            {"番茄鸡蛋", "红烧排骨", "农家小炒肉"},
            {"芝士", "丑小丫", "金枪鱼"}, {"羊肉串", "烤鸡翅", "烤羊排"}, {"长城干红", "燕京鲜啤", "青岛鲜啤"},
            {"拌粉丝", "大拌菜", "菠菜花生"}, {"小食组", "紫薯"},
            {"小米粥", "大米粥", "南瓜粥", "玉米粥", "紫米粥"}, {"儿童小汽车", "悠悠球", "熊大", " 熊二", "光头强"}
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        pinnedListView = (PinnedHeaderListView) findViewById(R.id.pinnedListView);
        final MainSectionedAdapter sectionedAdapter = new MainSectionedAdapter(this, leftStr, rightStr);
        pinnedListView.setAdapter(sectionedAdapter);
        adapter = new LeftListAdapter(this, leftStr, flagArray);
        leftListview.setAdapter(adapter);
        leftListview.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View view, int position, long arg3) {
                isScroll = false;

                for (int i = 0; i < leftStr.length; i++) {
                    if (i == position) {
                        flagArray[i] = true;
                    } else {
                        flagArray[i] = false;
                    }
                }
                adapter.notifyDataSetChanged();
                int rightSection = 0;
                for (int i = 0; i < position; i++) {
                    rightSection += sectionedAdapter.getCountForSection(i) + 1;
                }
                pinnedListView.setSelection(rightSection);

            }

        });

        pinnedListView.setOnScrollListener(new AbsListView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(AbsListView arg0, int scrollState) {
                switch (scrollState) {
                    // 当不滚动时
                    case AbsListView.OnScrollListener.SCROLL_STATE_IDLE:
                        // 判断滚动到底部
                        if (pinnedListView.getLastVisiblePosition() == (pinnedListView.getCount() - 1)) {
                            leftListview.setSelection(ListView.FOCUS_DOWN);
                        }

                        // 判断滚动到顶部
                        if (pinnedListView.getFirstVisiblePosition() == 0) {
                            leftListview.setSelection(0);
                        }

                        break;
                }
            }

            int y = 0;
            int x = 0;
            int z = 0;

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
                if (isScroll) {
                    for (int i = 0; i < rightStr.length; i++) {
                        if (i == sectionedAdapter.getSectionForPosition(pinnedListView.getFirstVisiblePosition())) {
                            flagArray[i] = true;
                            x = i;
                        } else {
                            flagArray[i] = false;
                        }
                    }
                    if (x != y) {
                        adapter.notifyDataSetChanged();
                        y = x;
                        //左侧ListView滚动到最后位置
                        if (y == leftListview.getLastVisiblePosition()) {
                            leftListview.setSelection(z);
                        }
                        //左侧ListView滚动到第一个位置
                        if (x == leftListview.getFirstVisiblePosition()) {
                            leftListview.setSelection(z);
                        }
                        if (firstVisibleItem + visibleItemCount == totalItemCount - 1) {
                            leftListview.setSelection(ListView.FOCUS_DOWN);
                        }
                    }
                } else {
                    isScroll = true;
                }
            }
        });

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        ButterKnife.unbind(this);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="horizontal">

    <ListView
        android:id="@+id/left_listview"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="2"
        android:scrollbars="none"
        android:divider="@null"></ListView>

    <cn.studyou.doublelistviewlinkage.View.PinnedHeaderListView
        android:id="@+id/pinnedListView"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_marginLeft="@dimen/dp10"
        android:layout_weight="5"
        android:background="@android:color/white"></cn.studyou.doublelistviewlinkage.View.PinnedHeaderListView>

</LinearLayout>

package cn.studyou.doublelistviewlinkage.Adapter;

import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import cn.studyou.doublelistviewlinkage.R;

/**
* 基本功能：左侧Adapter
* 创建：王杰
* 创建时间：16/4/14
* 邮箱：w489657152@gmail.com
*/
public class LeftListAdapter extends BaseAdapter {
   private String[] leftStr;
   boolean[] flagArray;
   private Context context;

   public LeftListAdapter(Context context, String[] leftStr, boolean[] flagArray) {
       this.leftStr = leftStr;
       this.context = context;
       this.flagArray = flagArray;
   }

   @Override
   public int getCount() {
       return leftStr.length;
   }

   @Override
   public Object getItem(int arg0) {
       return leftStr[arg0];
   }

   @Override
   public long getItemId(int arg0) {
       return arg0;
   }

   @Override
   public View getView(int arg0, View arg1, ViewGroup arg2) {
       Holder holder = null;
       if (arg1 == null) {
           holder = new Holder();
           arg1 = LayoutInflater.from(context).inflate(R.layout.left_list_item, null);
           holder.left_list_item = (TextView) arg1.findViewById(R.id.left_list_item);
           arg1.setTag(holder);
       } else {
           holder = (Holder) arg1.getTag();
       }
       holder.updataView(arg0);
       return arg1;
   }

   private class Holder {
       private TextView left_list_item;

       public void updataView(final int position) {
           left_list_item.setText(leftStr[position]);
           if (flagArray[position]) {
               left_list_item.setBackgroundColor(Color.rgb(255, 255, 255));
           } else {
               left_list_item.setBackgroundColor(Color.TRANSPARENT);
           }
       }

   }
}

package cn.studyou.doublelistviewlinkage.Adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

import cn.studyou.doublelistviewlinkage.R;
/**
* 基本功能：右侧Adapter
* 创建：王杰
* 创建时间：16/4/14
* 邮箱：w489657152@gmail.com
*/
public class MainSectionedAdapter extends SectionedBaseAdapter {

   private Context mContext;
   private String[] leftStr;
   private String[][] rightStr;

   public MainSectionedAdapter(Context context, String[] leftStr, String[][] rightStr) {
       this.mContext = context;
       this.leftStr = leftStr;
       this.rightStr = rightStr;
   }

   @Override
   public Object getItem(int section, int position) {
       return rightStr[section][position];
   }

   @Override
   public long getItemId(int section, int position) {
       return position;
   }

   @Override
   public int getSectionCount() {
       return leftStr.length;
   }

   @Override
   public int getCountForSection(int section) {
       return rightStr[section].length;
   }

   @Override
   public View getItemView(final int section, final int position, View convertView, ViewGroup parent) {
       RelativeLayout layout = null;
       if (convertView == null) {
           LayoutInflater inflator = (LayoutInflater) parent.getContext()
                   .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
           layout = (RelativeLayout) inflator.inflate(R.layout.right_list_item, null);
       } else {
           layout = (RelativeLayout) convertView;
       }
       ((TextView) layout.findViewById(R.id.textItem)).setText(rightStr[section][position]);
       layout.setOnClickListener(new OnClickListener() {
           @Override
           public void onClick(View arg0) {
               Toast.makeText(mContext, rightStr[section][position], Toast.LENGTH_SHORT).show();
           }
       });
       return layout;
   }

   @Override
   public View getSectionHeaderView(int section, View convertView, ViewGroup parent) {
       LinearLayout layout = null;
       if (convertView == null) {
           LayoutInflater inflator = (LayoutInflater) parent.getContext()
                   .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
           layout = (LinearLayout) inflator.inflate(R.layout.header_item, null);
       } else {
           layout = (LinearLayout) convertView;
       }
       layout.setClickable(false);
       ((TextView) layout.findViewById(R.id.textItem)).setText(leftStr[section]);
       return layout;
   }

}

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@color/gray_light"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/textItem"
        android:layout_marginLeft="@dimen/dp10"
        android:layout_width="wrap_content"
        android:layout_height="@dimen/dp30"
        android:layout_gravity="center_vertical"
        android:gravity="center_vertical"
        android:paddingLeft="@dimen/dp6"
        android:textColor="@color/black" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
 android:background="@color/gray_light"
    android:orientation="vertical" >
    
 <TextView 
     android:id="@+id/left_list_item"
     android:layout_width="match_parent"
     android:layout_height="@dimen/dp60"
     android:padding="@dimen/dp12"
  android:gravity="center_vertical"
  android:textColor="@color/black"/>
    
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/white"
    android:padding="@dimen/dp6">

    <ImageView
        android:id="@+id/imageItem"
        android:layout_width="@dimen/dp50"
        android:layout_height="@dimen/dp50"
        android:scaleType="fitXY"
        android:src="@drawable/pic"/>

    <TextView
        android:id="@+id/textItem"
        android:layout_width="wrap_content"
        android:layout_height="@dimen/dp50"
        android:gravity="center_vertical"
        android:paddingLeft="@dimen/dp6"
        android:layout_toRightOf="@+id/imageItem"
        android:textColor="@color/black" />
</RelativeLayout>