Android 树形控件源码.zip项目安卓应用源码下载

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(); } } }