Android_BaseAdapter排列基础_141004

此篇仅仅涉及ListView

BaseAdapter就Android应用程序中经常用到的基础数据适配器，它的主要用途是将一组数据传到像ListView、Spinner、Gallery及GridView等UI显示组件，它是继承自接口类Adapter，

BaseAdapter是实现了ListAdapter和SpinnerAdapter两个接口，当然它也可以直接给ListView和Spinner等UI组件直接提供数据

代码, 仅仅为用BaseAdapter实现最简单的ListView展示功能

 // MainActivity.java

package com.yline.baseadapter;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.listview);

		ListView lv_base = (ListView) findViewById(R.id.lv_base);
		lv_base.setAdapter(new myAdapter());
	}

	private class myAdapter extends BaseAdapter{

		/**
		 * 返回 显示item的条数
		 */
		@Override
		public int getCount() {
			return 20;
		}

		@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(int position, View convertView, ViewGroup parent) {
			
			View v = View.inflate(MainActivity.this, R.layout.listview_item, null);

			TextView tv_item1 = (TextView) v.findViewById(R.id.tv_item);

			tv_item1.setText("tv_item" + position + "\n");
			return v;
		}

	}
}

  //listview.xml

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

    <ListView
        android:id="@+id/lv_base"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" >
    </ListView>

</RelativeLayout>

  // listview_item.xml

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

    <TextView
        android:id="@+id/tv_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="TextView" />

</RelativeLayout>

 BaseAdapter 运行代码:

http://pan.baidu.com/s/1hqzNsW0

参考网址: 

无

之后 补充一：

http://blog.youkuaiyun.com/u014803950/article/details/40143355