关于自定义Adapter实现ListView的使用

时间：2023-12-15 14:09:08

以下为使用BaseAdapter作扩展，自定义Adapter来使用ListView控件：

需要注意以下的几点：

1、自定义Adapter时，需要特别注意Adapter类中getView()方法覆盖，注意加载布局文件和加载控件的区别；

2、自定义好Adapter后，在Activity中实现ListView的过程：

（1）生成Adapter对象（注意传入一个list表），并将Adapter对象作为ListView的适配器

ListViewAdapter adapter = new ListViewAdapter(getApplicationContext(),list); listView.setAdapter(adapter);
　　 （2）当list发生改动的时候，需要使用adapter.notifyDataSetChanged();
3、在Adapter的getView（）时，使用LayoutInflater.Inflate()方法加载布局，findViewByID（）加载控件；

项目包含的文件如下：

关于自定义Adapter实现ListView的使用关于自定义Adapter实现ListView的使用

结果如下：关于自定义Adapter实现ListView的使用

1、输入数字时候为第一种布局

2、输入文本的时候为第二种布局

完整代码如下

Adapter类：



package com.example.testlistview;


import java.util.List;


import android.content.Context;
import android.content.res.ColorStateList;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;


public class ListViewAdapter extends BaseAdapter {
	private Context context;
	private LayoutInflater listContainer;
	private List<String> listItems;


private TextView textView1;
	private TextView textView2;
	private Button button1;
	private Button button2;


public ListViewAdapter(Context context,List<String> list) {
		// TODO Auto-generated constructor stub
		this.context = context;
		this.listItems = list;
		this.listContainer = LayoutInflater.from(context);
	}


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


@Override
	public Object getItem(int arg0) {
		// TODO Auto-generated method stub
		return null;
	}


@Override
	public long getItemId(int arg0) {
		// TODO Auto-generated method stub
		return 0;
	}


@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		String str = listItems.get(position).toString();
		if(isNum(str)==false){
		    convertView = listContainer.inflate(R.layout.list_item_layout2, null);
		    textView1 = (TextView)convertView.findViewById(R.id.textView1);
		    textView2 = (TextView)convertView.findViewById(R.id.textView2);
		    button1 = (Button)convertView.findViewById(R.id.button1);
		    button2 = (Button)convertView.findViewById(R.id.button2);
		    textView1.setText(listItems.get(position));
		    textView1.setTextColor(Color.BLACK);
		    textView2.setText(listItems.get(position));
		    textView2.setTextColor(Color.BLACK);
		    button1.setText(listItems.get(position));
		    button2.setText(listItems.get(position));
		return convertView;
		}else {
			convertView = listContainer.inflate(R.layout.list_item_layout1, null);
			textView1 = (TextView)convertView.findViewById(R.id.textView1);
			textView2 = (TextView)convertView.findViewById(R.id.textView2);
			textView1.setText(listItems.get(position));
			textView1.setTextColor(Color.BLACK);
			textView2.setText(listItems.get(position));
			textView2.setTextColor(Color.BLACK);
			return convertView;
		}
	}


public static boolean isNum(String str){ 
		return str.matches("^[-+]?(([0-9]+)([.]([0-9]+))?|([.]([0-9]+))?)$"); 
	}


}



//Activity类


package com.example.testlistview;


import java.util.ArrayList;


import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;


public class ListViewActivity extends ActionBarActivity {
	private ListView listView;
	private Button btn;
	private EditText edt;
	private ListViewAdapter adapter;
	private ArrayList<String> list = new ArrayList<String>();


@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_list_view);
		listView = (ListView)findViewById(R.id.listView1);
		btn = (Button)findViewById(R.id.button1);
		edt = (EditText)findViewById(R.id.editText1);
		adapter = new ListViewAdapter(getApplicationContext(),list);	
		listView.setAdapter(adapter);


btn.setOnClickListener(new View.OnClickListener() {


@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				list.add(edt.getText().toString());
				adapter.notifyDataSetChanged();
			}
		});
	}


}


主布局


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >


<ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="312dp" >
    </ListView>


<LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >


<EditText
           android:id="@+id/editText1"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_weight="1"
           android:ems="10" >


<requestFocus />
       </EditText>


<Button
           android:id="@+id/button1"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_weight="1"
           android:text="提交" />


</LinearLayout>


</LinearLayout>


layout1布局：


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


<TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_weight="0.5"
        android:text="TextView" />


<TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_weight="0.5"
        android:text="TextView" />


</LinearLayout>


layout2布局：


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


<TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_weight="0.3"
        android:gravity="center"
        android:text="detail" />


<LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="0.4"
        android:gravity="center"
        android:orientation="vertical" >


<Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="layout1" />


<Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="layout2" />


</LinearLayout>


<TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_weight="0.3"
        android:gravity="center"
        android:text="state" />


</LinearLayout>


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