adapter.notifyDatasetChanged

package com.testadapter;import java.util.ArrayList;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.os.RemoteException;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.view.View.OnClickListener;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;import android.widget.ProgressBar;import android.widget.TextView;public class AdapterTest extends Activity {ListView mListview;ArrayList<Node> mlist;ArrayList<Node> mlist1;ArrayList<Node> mlist2;MyAdapter adapter; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mListview = (ListView) this.findViewById(R.id.listview); mlist1 = new ArrayList<Node>(); mlist2 = new ArrayList<Node>(); for(int i = 0; i < 5; i++) { Node n = new Node("node"+i, "id" + i); if(i < 3) { mlist1.add(n); } mlist2.add(n); } mlist = mlist1; adapter = new MyAdapter(this, mlist); mListview.setAdapter(adapter); mHandler.sendEmptyMessageDelayed(0, 3000); } public boolean isFirst = true; private Handler mHandler = new Handler() { public void handleMessage(Message msg) { if(isFirst) { mlist = mlist1; Log.d("testAdapter", "first"); adapter.notifyDataSetChanged(); isFirst = false; }else{ mlist = mlist2; adapter.notifyDataSetChanged(); Log.d("testAdapter", "second"); isFirst = true; } mHandler.sendEmptyMessageDelayed(0, 3000); } }; public void onDestroy() { mHandler.removeMessages(0); super.onDestroy(); } class MyAdapter extends BaseAdapter {private LayoutInflater mInflater;//private ArrayList<Node> list;public MyAdapter(Context context, ArrayList<Node> list) {mInflater = LayoutInflater.from(context);//this.list = list;}@Overridepublic int getCount() {//if(list != null) {return mlist.size();//}//return 0;}@Overridepublic Object getItem(int position) {return mlist.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ItemStruct struct;if (convertView == null) {TextView t = new TextView(AdapterTest.this);convertView = t;struct = new ItemStruct();struct.mName = t;convertView.setTag(struct);}else{struct = (ItemStruct) convertView.getTag();}struct.mName.setText(mlist.get(position).name);return convertView;}private class ItemStruct {TextView mName;}}class Node {public String name = "";public String id = "";public Node(String name, String id) {this.name = name;this.id = id;}}}

 

在设计adapter的时候就把其中的数据控制在全局的，不要写成adapter内部的的，否则在adapter.notifyDatasetChanged就不起作用了。