Android之自定义适配器
16lz
2021-01-23
activity_main.xml
items.xml
<?xml version="1.0" encoding="utf-8"?> MainActivity.java
package com.example.android_listview_adapter;import java.util.ArrayList;import java.util.List;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ListView;import android.widget.TextView;public class MainActivity extends ActionBarActivity {private ListView listView;private MyAdapter myAdapter;//自定义适配器@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);listView=(ListView) this.findViewById(R.id.listView1);myAdapter=new MyAdapter(getData());//把数据加进去listView.setAdapter(myAdapter);}public List getData(){List list=new ArrayList();for(int i=0;i<100;i++){list.add("ccnu"+i);}return list;}/** * * @author liuya * *一个基本的适配器有四个属性getCount，getItem，getItemId，getView *///由于json数据太复杂，所以要自定义适配器，声明适配器的类public class MyAdapter extends BaseAdapter{private List list;//构造方法，通过构造方法传递参数public MyAdapter(List list) {// TODO Auto-generated constructor stubthis.list=list;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn list.size();//得到适配器中填充的集合的个数，即是适配器的个数}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn list.get(position);//得到数据集的选项}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubView view=LayoutInflater.from(MainActivity.this).inflate(R.layout.items, null);//手工加载一个布局TextView textView=(TextView) view.findViewById(R.id.textView1);//把items.xml中的TextView加载到页面textView.setText(list.get(position));System.out.println("---->>"+position);return view;}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}} 
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