作业一.zip

package com.example.myapplication2; import android.os.Bundle; import android.widget.ListView; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import android.app.Activity; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; public class MainActivity extends Activity { private ImageView img; private List<HashMap<String, Object>> mData; private ListView listView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.friend_list); mData = getData();//为刚才的变量赋值 MyAdapter adapter = new MyAdapter(this);//创建一个适配器 listView = (ListView) findViewById(R.id.listView1);//实例化ListView listView.setAdapter(adapter);//为ListView控件绑定适配器 } /** 自定义适配器 */ public class MyAdapter extends BaseAdapter { private LayoutInflater mInflater;// 动态布局映射 public MyAdapter(Context context) { this.mInflater = LayoutInflater.from(context); } // 决定ListView有几行可见 @Override public int getCount() { return mData.size();// ListView的条目数 } @Override public Object getItem(int arg0) { return null; } @Override public long getItemId(int arg0) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { convertView = mInflater.inflate(R.layout.friend_list_item, null);//根据布局文件实例化view TextView title = (TextView) convertView.findViewById(R.id.title);//找某个控件 title.setText(mData.get(position).get("title").toString());//给该控件设置数据(数据从集合类中来) TextView time = (TextView) convertView.findViewById(R.id.time);//找某个控件 time.setText(mData.get(position).get("time").toString());//给该控件设置数据(数据从集合类中来) TextView info = (TextView) convertView.findViewById(R.id.info); info.setText(mData.get(position).get("info").toString()); img = (ImageView) convertView.findViewById(R.id.img); img.setBackgroundResource((Integer) mData.get(position).get("img")); return convertView; } } // 初始化一个List private List<HashMap<String, Object>> getData() { // 新建一个集合类，用于存放多条数据 ArrayList<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>(); HashMap<String, Object> map = null; for (int i = 1; i <= 100; i++) { map = new HashMap<String, Object>(); map.put("title", "人物" + i); map.put("time", ""); map.put("info", "请分享最近的新瓜！"); map.put("img", R.drawable.pic_person); list.add(map); } return list; } public void showInfo(int position){ getData(); } }