PinnedHeaderListView实现删除

项目中用到四个List集合展示一个页面,并且每个页面都会有一个标题栏.找了半天资料决定用PinnedHeaderListView开源项目.最后需求又来了,需要一个删除的功能,又去网上找资料,发现没有实现删除的demo,于是自己把PinnedHeaderListView源码分析了下,其实也就一个类.下面我贴上代码,希望后面的朋友少走弯路.

PinnedHeaderListView   实现滚动,重绘,添加回调函数

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.*;
import android.widget.AbsListView.OnScrollListener;

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
        // for
        // <
        // HONEYCOMB
        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(PinnedHeaderListView.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);

    }
}

SectionedBaseAdapter   

import android.util.SparseArray;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import za.co.immedia.pinnedheaderlistview.PinnedHeaderListView.PinnedSectionedHeaderAdapter;

public abstract class SectionedBaseAdapter extends BaseAdapter implements PinnedSectionedHeaderAdapter {
    private static int HEADER_VIEW_TYPE = 0;
    private static int ITEM_VIEW_TYPE = 0;

    /**
     * Holds the calculated values of @{link getPositionInSectionForPosition}
     */
    private SparseArray<Integer> mSectionPositionCache;
    /**
     * Holds the calculated values of @{link getSectionForPosition}
     */
    private SparseArray<Integer> mSectionCache;
    /**
     * Holds the calculated values of @{link getCountForSection}
     */
    private SparseArray<Integer> mSectionCountCache;

    /**
     * Caches the item count
     */
    private int mCount;
    /**
     * Caches the section count
     */
    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;
    }

}

TestSectionedAdapter  适配器

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import za.co.immedia.pinnedheaderlistview.SectionedBaseAdapter;
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;

public class TestSectionedAdapter extends SectionedBaseAdapter{
	private List<String> titles;//所有标题
	private Map<String,List<SWWSafearea>> mMap;//根据首字母存放数据
	
	public TestSectionedAdapter(){
		List<SWWSafearea> localWifi=new ArrayList<SWWSafearea>();
		for(int i=1;i<=10;i++){
			localWifi.add(new SWWSafearea(i,"10"+i));
		}
		
		List<SWWSafearea> localGeography=new ArrayList<SWWSafearea>();
		for(int i=4;i<=15;i++){
			localGeography.add(new SWWSafearea(i,"10"+i,i));
		}
		
		List<SWWSafearea> serverWifi=new ArrayList<SWWSafearea>();
//		for(int i=7;i<=9;i++){
//			serverWifi.add(new SWWSafearea(i,"10"+i));
//		}
		
		List<SWWSafearea> serverGeography=new ArrayList<SWWSafearea>();
		for(int i=30;i<=60;i++){
			serverGeography.add(new SWWSafearea(i,"10"+i,i));
		}
		
		titles=new ArrayList<String>();
		titles.add("1");
		titles.add("2");
		titles.add("3");
		titles.add("4");
		
		mMap = new HashMap<String, List<SWWSafearea>>();
		mMap.put(titles.get(0),localWifi);
		mMap.put(titles.get(1),localGeography);
		mMap.put(titles.get(2),serverWifi);
		mMap.put(titles.get(3),serverGeography);
	}

    @Override
    public Object getItem(int section, int position) {
        return mMap.get(titles.get(section)).get(position);
    }

    @Override
    public long getItemId(int section, int position) {
        return 0;
    }

    @Override
    public int getSectionCount() {//一共显示多少行标题栏
        return titles.size();
    }

    //每列显示的行数
    @Override
    public int getCountForSection(int section) {
        return mMap.get(titles.get(section)).size();
    }

	@Override
    public View getItemView(final int section,final int position, View convertView, ViewGroup parent) {
		ViewHolder holder=null;
		if (null==convertView) {
			holder=new ViewHolder();
			LayoutInflater inflator = (LayoutInflater) parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
			convertView=(LinearLayout)inflator.inflate(R.layout.list_item, null);
			holder.name=(TextView) convertView.findViewById(R.id.name);
			holder.radius=(TextView) convertView.findViewById(R.id.radius);
			holder.safeareaItem=(RelativeLayout) convertView.findViewById(R.id.safearea_item);
			convertView.setTag(holder);
		}else{
			holder=(ViewHolder) convertView.getTag();
		}
		SWWSafearea sf=mMap.get(titles.get(section)).get(position);
		if(section==0||section==2){
			holder.name.setText(sf.name);
			holder.radius.setText("");
		}else{
			holder.name.setText(sf.name);
			holder.radius.setText(""+sf.radius);
		}
		holder.safeareaItem.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				mMap.get(titles.get(section)).remove(position);
				notifyDataSetChanged();
			}
		});
        return convertView;
    }
    
	private class ViewHolder{
		TextView name,radius;
		RelativeLayout safeareaItem;
	}

    @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;
        }
        
        TextView textView=((TextView) layout.findViewById(R.id.textItem));
        if(mMap.get(titles.get(section)).size()>0){
        	textView.setVisibility(View.VISIBLE);
        	textView.setText(titles.get(section));
        }else{
        	textView.setVisibility(View.GONE);
        }
        return layout;
    }
    
    

	//实体类
	private class SWWSafearea{
		public int id;
		public String name;
		public int radius;
		public SWWSafearea(int id, String name, int radius) {
			super();
			this.id = id;
			this.name = name;
			this.radius = radius;
		}
		
		public SWWSafearea(int id, String name) {
			super();
			this.id = id;
			this.name = name;
		}
	}
}

MainActivity 

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import za.co.immedia.pinnedheaderlistview.PinnedHeaderListView;

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        PinnedHeaderListView listView = (PinnedHeaderListView) findViewById(R.id.pinnedListView);
        
        TestSectionedAdapter sectionedAdapter = new TestSectionedAdapter();
        listView.setAdapter(sectionedAdapter);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

效果图如下:

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