Android 多层树完美实现

效果: 
 

main.xml: 

<?xml version="1.0" encoding="utf-8"?>  
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="horizontal" android:layout_width="fill_parent"  
    android:layout_height="wrap_content">  
    <ImageView android:id="@+id/icon" android:layout_width="wrap_content"  
        android:layout_height="fill_parent" android:layout_marginRight="6.0dip"  
        android:layout_alignParentTop="true" android:layout_alignParentBottom="true" />  
    <!--<TextView android:id="@+id/text" android:layout_gravity="center_vertical"   
        android:layout_weight="1.0" android:layout_height="wrap_content" android:layout_width="0dip"   
        android:textAppearance="?android:attr/textAppearanceMedium" android:singleLine="true"   
        android:textColor="#ffffff" /> -->  
    <TextView android:textAppearance="?android:textAppearanceMedium"  
        android:gravity="center_vertical" android:id="@+id/text"  
        android:textColor="#ffffff" android:layout_width="fill_parent"  
        android:layout_height="fill_parent" android:singleLine="true"  
        android:layout_toRightOf="@id/icon" android:layout_alignParentTop="true"  
        android:layout_alignParentBottom="true" />  
</RelativeLayout>  

 

TreeElement.java: 

Java代码 

package com.iaiai;  
  
import java.util.ArrayList;  
  
/** 
 *  
 * <p> 
 * Title: TreeElement.java 
 * </p> 
 * <p> 
 * E-Mail: 176291935@qq.com 
 * </p> 
 * <p> 
 * QQ: 176291935 
 * </p> 
 * <p> 
 * Http: iaiai.iteye.com 
 * </p> 
 * <p> 
 * Create time: 2011-8-20 
 * </p> 
 *  
 * @author 丸子 
 * @version 0.0.1 
 */  
public class TreeElement {  
  
    private String id;  
    private String outlineTitle;  
    private boolean mhasParent;  
    private boolean mhasChild;  
    private TreeElement parent;  
    private int level;  
    private ArrayList<TreeElement> childList = new ArrayList<TreeElement>();  
  
    public String getId() {  
        return id;  
    }  
  
    public void setId(String id) {  
        this.id = id;  
    }  
  
    public String getOutlineTitle() {  
        return outlineTitle;  
    }  
  
    public void setOutlineTitle(String outlineTitle) {  
        this.outlineTitle = outlineTitle;  
    }  
  
    public boolean isMhasParent() {  
        return mhasParent;  
    }  
  
    public void setMhasParent(boolean mhasParent) {  
        this.mhasParent = mhasParent;  
    }  
  
    public boolean isMhasChild() {  
        return mhasChild;  
    }  
  
    public void setMhasChild(boolean mhasChild) {  
        this.mhasChild = mhasChild;  
    }  
  
    public int getLevel() {  
        return level;  
    }  
  
    public void setLevel(int level) {  
        this.level = level;  
    }  
  
    public boolean isExpanded() {  
        return expanded;  
    }  
  
    public void setExpanded(boolean expanded) {  
        this.expanded = expanded;  
    }  
  
    public ArrayList<TreeElement> getChildList() {  
        return childList;  
    }  
  
    public TreeElement getParent() {  
        return parent;  
    }  
  
    public void setParent(TreeElement parent) {  
        this.parent = parent;  
    }  
  
    // private OutlineElement outlineElement;  
    private boolean expanded;  
  
    public void addChild(TreeElement c) {  
        this.childList.add(c);  
        this.mhasParent = false;  
        this.mhasChild = true;  
        c.parent = this;  
        c.level = this.level + 1;  
  
    }  
  
    public TreeElement(String id, String title) {  
        super();  
        this.id = id;  
        this.outlineTitle = title;  
        this.level = 0;  
        this.mhasParent = true;  
        this.mhasChild = false;  
        this.parent = null;  
    }  
  
    public TreeElement(String id, String outlineTitle, boolean mhasParent,  
            boolean mhasChild, TreeElement parent, int level, boolean expanded) {  
        super();  
        this.id = id;  
        this.outlineTitle = outlineTitle;  
        this.mhasParent = mhasParent;  
        this.mhasChild = mhasChild;  
        this.parent = parent;  
        if (parent != null) {  
            this.parent.getChildList().add(this);  
        }  
        this.level = level;  
        this.expanded = expanded;  
    }  
  
}  

TreeView.java: 

Java代码 

package com.iaiai;  
  
import java.util.ArrayList;  
import java.util.List;  
  
import android.app.ListActivity;  
import android.content.Context;  
import android.graphics.Bitmap;  
import android.graphics.BitmapFactory;  
import android.os.Bundle;  
import android.util.Log;  
import android.view.LayoutInflater;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.ArrayAdapter;  
import android.widget.ImageView;  
import android.widget.ListView;  
import android.widget.TextView;  
import android.widget.Toast;  
  
/** 
 *  
 * <p> 
 * Title: TreeView.java 
 * </p> 
 * <p> 
 * E-Mail: 176291935@qq.com 
 * </p> 
 * <p> 
 * QQ: 176291935 
 * </p> 
 * <p> 
 * Http: iaiai.iteye.com 
 * </p> 
 * <p> 
 * Create time: 2011-8-20 
 * </p> 
 *  
 * @author 丸子 
 * @version 0.0.1 
 */  
public class TreeView extends ListActivity {  
    private ArrayList<TreeElement> mPdfOutlinesCount = new ArrayList<TreeElement>();  
    private TreeViewAdapter treeViewAdapter = null;  
  
    /** Called when the activity is first created. */  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
  
        initialData();  
        treeViewAdapter = new TreeViewAdapter(this, R.layout.main,  
                mPdfOutlinesCount);  
        setListAdapter(treeViewAdapter);  
        registerForContextMenu(getListView());  
    }  
  
    private void initialData() {  
        TreeElement element1 = new TreeElement("01", "关键类");  
        TreeElement element2 = new TreeElement("02", "应用程序组件");  
        TreeElement element3 = new TreeElement("03", "Activity和任务");  
        TreeElement element4 = new TreeElement("04", "激活组件：intent");  
        TreeElement element5 = new TreeElement("05", "关闭组件");  
        TreeElement element6 = new TreeElement("06", "manifest文件");  
        TreeElement element7 = new TreeElement("07", "Intent过滤器");  
        TreeElement element8 = new TreeElement("08", "Affinity（吸引力）和新任务");  
        TreeElement element9 = new TreeElement("09", "加载模式");  
        TreeElement element10 = new TreeElement("10", "加载模式孩子1");  
        TreeElement element11 = new TreeElement("11", "加载模式孩子2");  
        TreeElement element12 = new TreeElement("12", "加载模式孩子2的孩子1");  
        TreeElement element13 = new TreeElement("13", "加载模式孩子2的孩子2");  
        TreeElement element14 = new TreeElement("14", "加载模式孩子1的孩子1");  
        TreeElement element15 = new TreeElement("15", "加载模式孩子1的孩子2");  
        TreeElement element16 = new TreeElement("16", "加载模式孩子1的孩子3");  
        TreeElement element17 = new TreeElement("17", "加载模式孩子1的孩子4");  
        TreeElement element18 = new TreeElement("18", "加载模式孩子1的孩子5");  
        TreeElement element19 = new TreeElement("19", "加载模式孩子1的孩子6");  
  
        mPdfOutlinesCount.add(element1);  
        mPdfOutlinesCount.add(element2);  
        mPdfOutlinesCount.add(element9);  
        element2.addChild(element3);  
        element1.addChild(element4);  
        element1.addChild(element5);  
        element1.addChild(element6);  
        element1.addChild(element7);  
        element7.addChild(element8);  
        element9.addChild(element10);  
        element9.addChild(element11);  
        element11.addChild(element12);  
        element11.addChild(element13);  
        element10.addChild(element14);  
        element10.addChild(element15);  
        element10.addChild(element16);  
        element10.addChild(element17);  
        element10.addChild(element18);  
        element10.addChild(element19);  
  
    }  
  
    @SuppressWarnings("unchecked")  
    private class TreeViewAdapter extends ArrayAdapter {  
        public TreeViewAdapter(Context context, int textViewResourceId,  
                List objects) {  
            super(context, textViewResourceId, objects);  
            mInflater = LayoutInflater.from(context);  
            mfilelist = objects;  
            mIconCollapse = BitmapFactory.decodeResource(  
                    context.getResources(), R.drawable.outline_list_collapse);  
            mIconExpand = BitmapFactory.decodeResource(context.getResources(),  
                    R.drawable.outline_list_expand);  
        }  
  
        private LayoutInflater mInflater;  
        private List<TreeElement> mfilelist;  
        private Bitmap mIconCollapse;  
        private Bitmap mIconExpand;  
  
        public int getCount() {  
            return mfilelist.size();  
        }  
  
        public Object getItem(int position) {  
            return position;  
        }  
  
        public long getItemId(int position) {  
            return position;  
        }  
  
        public View getView(int position, View convertView, ViewGroup parent) {  
            ViewHolder holder;  
            /* if (convertView == null) { */  
            convertView = mInflater.inflate(R.layout.main, null);  
            holder = new ViewHolder();  
            holder.text = (TextView) convertView.findViewById(R.id.text);  
            holder.icon = (ImageView) convertView.findViewById(R.id.icon);  
            convertView.setTag(holder);  
            /* 
             * } else { holder = (ViewHolder) convertView.getTag(); } 
             */  
  
            final TreeElement obj = mfilelist.get(position);  
  
            holder.text.setOnClickListener(new View.OnClickListener() {  
  
                @Override  
                public void onClick(View v) {  
                    Log.i("TreeView", "obj.id:" + obj.getId());  
                }  
            });  
  
            int level = obj.getLevel();  
            holder.icon.setPadding(25 * (level + 1),  
                    holder.icon.getPaddingTop(), 0,  
                    holder.icon.getPaddingBottom());  
            holder.text.setText(obj.getOutlineTitle());  
            if (obj.isMhasChild() && (obj.isExpanded() == false)) {  
                holder.icon.setImageBitmap(mIconCollapse);  
            } else if (obj.isMhasChild() && (obj.isExpanded() == true)) {  
                holder.icon.setImageBitmap(mIconExpand);  
            } else if (!obj.isMhasChild()) {  
                holder.icon.setImageBitmap(mIconCollapse);  
                holder.icon.setVisibility(View.INVISIBLE);  
            }  
            return convertView;  
        }  
  
        class ViewHolder {  
            TextView text;  
            ImageView icon;  
  
        }  
    }  
  
    @Override  
    protected void onListItemClick(ListView l, View v, int position, long id) {  
        super.onListItemClick(l, v, position, id);  
        Log.i("TreeView", "position:" + position);  
        if (!mPdfOutlinesCount.get(position).isMhasChild()) {  
            Toast.makeText(this, mPdfOutlinesCount.get(position)  
                    .getOutlineTitle(), 2000);  
            /* 
             * int pageNumber; Intent i = getIntent(); element element = 
             * mPdfOutlinesCount .get(position); pageNumber = 
             * element.getOutlineElement().pageNumber; if (pageNumber <= 0) { 
             * String name = element.getOutlineElement().destName; pageNumber = 
             * idocviewer.getPageNumberForNameForOutline(name); 
             * element.getOutlineElement().pageNumber = pageNumber; 
             * element.getOutlineElement().destName = null; } 
             * i.putExtra("PageNumber", pageNumber); setResult(RESULT_OK, i); 
             * finish(); 
             */  
  
            return;  
        }  
  
        if (mPdfOutlinesCount.get(position).isExpanded()) {  
            mPdfOutlinesCount.get(position).setExpanded(false);  
            TreeElement element = mPdfOutlinesCount.get(position);  
            ArrayList<TreeElement> temp = new ArrayList<TreeElement>();  
  
            for (int i = position + 1; i < mPdfOutlinesCount.size(); i++) {  
                if (element.getLevel() >= mPdfOutlinesCount.get(i).getLevel()) {  
                    break;  
                }  
                temp.add(mPdfOutlinesCount.get(i));  
            }  
  
            mPdfOutlinesCount.removeAll(temp);  
  
            treeViewAdapter.notifyDataSetChanged();  
            /* 
             * fileExploreAdapter = new TreeViewAdapter(this, R.layout.outline, 
             * mPdfOutlinesCount); 
             */  
  
            // setListAdapter(fileExploreAdapter);  
  
        } else {  
            TreeElement obj = mPdfOutlinesCount.get(position);  
            obj.setExpanded(true);  
            int level = obj.getLevel();  
            int nextLevel = level + 1;  
  
            for (TreeElement element : obj.getChildList()) {  
                element.setLevel(nextLevel);  
                element.setExpanded(false);  
                mPdfOutlinesCount.add(position + 1, element);  
  
            }  
            treeViewAdapter.notifyDataSetChanged();  
            /* 
             * fileExploreAdapter = new TreeViewAdapter(this, R.layout.outline, 
             * mPdfOutlinesCount); 
             */  
  
            // setListAdapter(fileExploreAdapter);  
        }  
    }  
  
}  

转自：http://www.iteye.com/topic/1113720