Android 经典示例源码

这是我根据自己的良好习惯，把网络上的经典Android 案例组织在一个工程中。对于Android 学习者有很好的好处。欢迎大家把这个示例项目越做越大。为后来的新人积累财富。发扬前人种树，后人乘凉的精神。

package com.cmw.android.widgets;

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;

import com.cmw.android.data.TreeDataProvider;
import com.cmw.android.model.TreeElement;

public class MainFrameActivity  extends ListActivity{
 private List<TreeElement> nodes = new ArrayList<TreeElement>();
    private TreeViewAdapter treeViewAdapter = null; 
    private TreeDataProvider provider = null;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  provider = new TreeDataProvider(this);
  nodes = provider.getDataSource();
   treeViewAdapter = new TreeViewAdapter(this, R.layout.mainframe,nodes); 
      setListAdapter(treeViewAdapter); 
      registerForContextMenu(getListView()); 
 }
 
 
 @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.plus); 
            mIconExpand = BitmapFactory.decodeResource(context.getResources(), 
                    R.drawable.cut); 
        } 
 
        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; 
            convertView = mInflater.inflate(R.layout.mainframe, null); 
            holder = new ViewHolder(); 
            holder.text = (TextView) convertView.findViewById(R.id.treetext); 
            holder.icon = (ImageView) convertView.findViewById(R.id.icon); 
            convertView.setTag(holder); 
 
            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()); 
                    obj.forward(MainFrameActivity.this);
                } 
            }); 
 
            int level = obj.getLevel(); 
            holder.icon.setPadding(25 * (level + 1), 
                    holder.icon.getPaddingTop(), 0, 
                    holder.icon.getPaddingBottom()); 
            holder.text.setText(obj.getTitle()); 
            if (obj.isHasChild()&& (obj.isExpanded() == false)) { 
                holder.icon.setImageBitmap(mIconCollapse); 
            } else if (obj.isHasChild() && (obj.isExpanded() == true)) { 
                holder.icon.setImageBitmap(mIconExpand); 
            } else if (!obj.isHasChild()) { 
                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 (!nodes.get(position).isHasChild()) { 
            Toast.makeText(this, nodes.get(position).getTitle(), 2000); 
            return; 
        } 
 
        if (nodes.get(position).isExpanded()) { 
            nodes.get(position).setExpanded(false); 
            TreeElement element = nodes.get(position); 
            ArrayList<TreeElement> temp = new ArrayList<TreeElement>(); 
 
            for (int i = position + 1; i < nodes.size(); i++) { 
                if (element.getLevel() >= nodes.get(i).getLevel()) { 
                    break; 
                } 
                temp.add(nodes.get(i)); 
            } 
 
            nodes.removeAll(temp); 
 
            treeViewAdapter.notifyDataSetChanged(); 
 
        } else { 
            TreeElement obj = nodes.get(position); 
            obj.setExpanded(true); 
            int level = obj.getLevel(); 
            int nextLevel = level + 1; 
 
            for (TreeElement element : obj.getChilds()) { 
                element.setLevel(nextLevel); 
                element.setExpanded(false); 
                nodes.add(position + 1, element); 
 
            } 
            treeViewAdapter.notifyDataSetChanged(); 
        } 
    } 
 
}

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