为什么80%的码农都做不了架构师?>>>
ListView 生成方法:
直接使用listView进行创建;
让Activity继承ListActivity(该Activity显示的组件为ListView);
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为listView设置现显示的列表项
如何让ListView显示出AdapterView的特性 通过setAdapter方法来进行AdapterView,并由Adapter提供列表项的每个组件,
AdapterView负责采用合适的方式来显示这些列表项
1.ArrayAdapter
创建ArrayAdapter基本的参数
//本地Context对象
// 资源ID,作为列表项组件作为每个列表项的组件,
// 数组或List为多个列表项提供数据,包含多少的元素,就生成多少的列表项
MainActivity
public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ListView list1 = (ListView) findViewById(R.id.list1);//定义一个数组String[] arr1 = {"北京", "南京", "南通"};//将数组包装成ArrayAdapterArrayAdapter<String> adapter1 = new ArrayAdapter<String>(this, R.layout.array_items, arr1);//为ListView设置Adapterlist1.setAdapter(adapter1);ListView list2 = (ListView) findViewById(R.id.list2);String[] arr2 = {"唐僧", "孙悟空", "猪八戒", "牛魔王"};ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(this, R.layout.checked_item, arr2);//本地Context对象// 资源ID,作为列表项组件作为每个列表项的组件,// 数组或List为多个列表项提供数据,包含多少的元素,就生成多少的列表项list2.setAdapter(adapter2);}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><!--直接使用数组资源给出列表--><!----><ListViewandroid:id="@+id/list1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:divider="#f00"android:dividerHeight="10px"android:headerDividersEnabled="true"></ListView><ListViewandroid:id="@+id/list2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:divider="#f00"android:dividerHeight="2px"android:headerDividersEnabled="false"></ListView></LinearLayout>
array_item.xml
<?xml version="1.0" encoding="utf-8"?><!--设置-->
<TextView xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/TextView"android:layout_width="match_parent"android:layout_height="wrap_content"android:padding="10px"android:shadowColor="#f0f"android:shadowDx="4"android:shadowDy="4"android:shadowRadius="2"android:textSize="24dp"></TextView>
checked_item页面
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"></TextView>
2.SimpleAdapter
基本的参数
//集合对象,对对象生成一个列表项//一个界面布局的ID//是一个String[]类型的参数,提取对象生成列表项//是一个int[]类型的参数,该参数决定填充哪些组件
public class MainActivity extends AppCompatActivity {private String[] names = new String[]{"酸奶店", "老板娘", "周太阳"};private String[] descs = new String[]{"梦想", "梦想", "18岁"};private int[] imagsIDs = new int[]{R.drawable.adele, R.drawable.adele2, R.drawable.adele3};protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//创建一个list集合,集合的元素为maoList<Map<String, Object>> listItems = new ArrayList<Map<String, Object>>();for (int i = 0; i < names.length; i++) {Map<String, Object> listItem = new HashMap<String, Object>();listItem.put("header", imagsIDs[i]);listItem.put("personName", names[i]);listItem.put("desc", descs[i]);listItems.add(listItem);}//创建一个SimpleAdapterSimpleAdapter simpleAdapter = new SimpleAdapter(this, listItems,R.layout.simple_item, new String[]{"personName","header","desc"},new int[]{R.id.name, R.id.header, R.id.desc});//集合对象,对对象生成一个列表项//一个界面布局的ID//是一个String[]类型的参数,提取对象生成列表项//是一个int[]类型的参数,该参数决定填充哪些组件ListView list = (ListView) findViewById(R.id.mylist);//为ListView设置Adapterlist.setAdapter(simpleAdapter);//为ListView的列表项的点击时间监听器list.setOnItemClickListener(new AdapterView.OnItemClickListener() {public void onItemClick(AdapterView<?> parent, View view, int position, long id) {System.out.println(names[position]+"被点击了");}});//为ListView的列表项的选中事件绑定监听器list.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {@Overridepublic void onItemSelected(AdapterView<?> parent, View view, int position, long id) {System.out.println(names[position] + "被选中了");}public void onNothingSelected(AdapterView<?> parent) {}});}
}
activity_main
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"><ListViewandroid:id="@+id/mylist"android:layout_width="match_parent"android:layout_height="wrap_content"></ListView>
</LinearLayout>
Simple_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="horizontal"><ImageViewandroid:layout_width="50dp"android:layout_height="50dp"android:id="@+id/header"android:paddingLeft="10dp"/><LinearLayoutandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="vertical"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/name"android:textSize="20dp"android:textColor="#f0f"android:paddingLeft="10dp"/><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/desc"android:paddingLeft="10dp"android:textSize="14dp"/></LinearLayout>
</LinearLayout>
3.BaseAdapter
public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ListView myList = (ListView) findViewById(R.id.myList);BaseAdapter adapter =new BaseAdapter() {public int getCount() { //该方法的返回值将会控制该Adapter将会包含多少个列表项//指定一共包含40个选项return 40;}//返回值决定第postition处的列表项的内容public Object getItem(int position) {return null;}//重写该方法,该方法的返回值将作为列表项的iDpublic long getItemId(int position) {return position;}//重写该方法,该方法返回的view将作为列表项(第position处的列表项组件)public View getView(int position, View convertView, ViewGroup parent) {//创建一个LinearLayout,并向其中添加两个组件LinearLayout line = new LinearLayout(MainActivity.this);line.setOrientation(0);ImageView image = new ImageView(MainActivity.this);image.setImageResource(R.drawable.smallfresh);TextView text = new TextView(MainActivity.this);text.setText("第"+(position + 1)+"列表项");text.setTextSize(20);text.setTextColor(Color.RED);line.addView(image);line.addView(text);//返回LineLayout实例return line;}};myList.setAdapter(adapter);}
}