Android BaseAdapter用法

最新推荐文章于 2023-06-24 17:09:41 发布

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本文介绍了一个使用自定义BaseAdapter实现的ListView示例，展示了如何加载数据并为每个列表项设置图片、文字和CheckBox，同时实现了点击切换状态的功能。

1.两个布局文件listview和listitem

第一个布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >

弟二个布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="horizontal"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
  <ImageView
   android:layout_width="50dp"
   android:layout_height="50dp"
   android:id="@+id/imageview"/>
  <TextView
   android:layout_width="150dp"
   android:layout_height="50dp"
   android:id="@+id/textview"/>
  <CheckBox
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:id="@+id/checkbox"/>
</LinearLayout>

java文件

package com.example.baseadapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.os.Bundle;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.CompoundButton.OnCheckedChangeListener;

public class MainActivity extends Activity {

private ListView listview;
private String[] names = {"寮犱笁","鏉庡洓","鐜嬩簲"};
private int[] images = {R.drawable.a,R.drawable.b,R.drawable.c};
private String[] states = {"0","0","0"};
MyAdapter adapter;
List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();
@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  listview = (ListView)findViewById(R.id.listview);
        loadData();
        adapter = new MyAdapter();
        listview.setAdapter(adapter);
        listview.setOnItemClickListener(new OnItemClickListener() {

   @Override
   public void onItemClick(AdapterView<?> parent, View view,
     int position, long id) {
    // TODO Auto-generated method stub
    if(list.get(position).get("state").toString().equals("1")){
     list.get(position).put("state", "0");
    }
    else {
     list.get(position).put("state","1");
    }
    adapter.notifyDataSetChanged();
   }
  });
}

public void loadData(){
     for (int i = 0; i < names.length; i++) {
   Map<String,Object> map = new HashMap<String, Object>();
   map.put("name", names[i]);
   map.put("image", images[i]);
   map.put("state", states[i]);
   list.add(map);
  }
    }

    class MyAdapter extends BaseAdapter{

  @Override
  public int getCount() {
   // TODO Auto-generated method stub
   return list.size();
  }

  @Override
  public Object getItem(int position) {
   // TODO Auto-generated method stub
   return null;
  }

  @Override
  public long getItemId(int position) {
   // TODO Auto-generated method stub
   return 0;
  }

  @Override
  public View getView(final int position, View convertView, ViewGroup parent) {
   // TODO Auto-generated method stub
   LayoutInflater l = LayoutInflater.from(MainActivity.this);
   View view = l.inflate(R.layout.item, null);
   ImageView imageview = (ImageView)view.findViewById(R.id.imageview);
   imageview.setImageResource(Integer.parseInt(list.get(position).get("image").toString()));
   TextView textview = (TextView)view.findViewById(R.id.textview);
   textview.setText(list.get(position).get("name").toString());
   CheckBox checkbox = (CheckBox)view.findViewById(R.id.checkbox);
   checkbox.setFocusable(false);
   if(list.get(position).get("state").equals("1")){
    checkbox.setChecked(true);
   }
   else {
    checkbox.setChecked(false);
   }
   checkbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
     // TODO Auto-generated method stub
     if(isChecked){
      list.get(position).put("state", "1");
     }
     else {
      list.get(position).put("state", "0");
     }
    }
   });
   return view;

  }

    }

@Override
public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.activity_main, menu);
  return true;
}

}