Android PinnedHeaderListView 详解

PinnedHeaderListView.java

SectionedBaseAdapter.java

(一) 使用:

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xml 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=“vertical” >

<za.co.immedia.pinnedheaderlistview.PinnedHeaderListView

android:id=“@+id/pinnedListView”

android:layout_width=“match_parent”

android:layout_height=“match_parent”

android:background=“@android:color/white” >

</za.co.immedia.pinnedheaderlistview.PinnedHeaderListView>

Activity

public class MainActivity extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

PinnedHeaderListView listView = (PinnedHeaderListView) findViewById(R.id.pinnedListView);

LayoutInflater inflator = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

LinearLayout header1 = (LinearLayout) inflator.inflate(R.layout.list_item, null);

((TextView) header1.findViewById(R.id.textItem)).setText(“HEADER 1”);

LinearLayout header2 = (LinearLayout) inflator.inflate(R.layout.list_item, null);

((TextView) header2.findViewById(R.id.textItem)).setText(“HEADER 2”);

LinearLayout footer = (LinearLayout) inflator.inflate(R.layout.list_item, null);

((TextView) footer.findViewById(R.id.textItem)).setText(“FOOTER”);

listView.addHeaderView(header1);

listView.addHeaderView(header2);

listView.addFooterView(footer);

TestSectionedAdapter sectionedAdapter = new TestSectionedAdapter();

listView.setAdapter(sectionedAdapter);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.activity_main, menu);

return true;

}

}

adapter

继承    SectionedBaseAdapter

package za.co.immedia.pinnedheaderlistviewexample;

import za.co.immedia.pinnedheaderlistview.SectionedBaseAdapter;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.LinearLayout;

import android.widget.TextView;

public class TestSectionedAdapter extends SectionedBaseAdapter {

@Override

public Object getItem(int section, int position) {

// TODO Auto-generated method stub

return null;

}

@Override

public long getItemId(int section, int position) {

// TODO Auto-generated method stub

return 0;

}

@Override

public int getSectionCount() {//header的数量

return 3;

}

@Override

public int getCountForSection(int section) {//子item的数量

return 15;

}

@Override

public View getItemView(int section, int position, View convertView, ViewGroup parent) {//普通item的getview方法

LinearLayout layout = null;

if (convertView == null) {

LayoutInflater inflator = (LayoutInflater) parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

layout = (LinearLayout) inflator.inflate(R.layout.list_item, null);

} else {

layout = (LinearLayout) convertView;

}

((TextView) layout.findViewById(R.id.textItem)).setText("Section " + section + " Item " + position);

return layout;

}

@Override

public View getSectionHeaderView(int section, View convertView, ViewGroup parent) {//header的getview方法

LinearLayout layout = null;

if (convertView == null) {

LayoutInflater inflator = (LayoutInflater) parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

layout = (LinearLayout) inflator.inflate(R.layout.header_item, null);

} else {

layout = (LinearLayout) convertView;

}

((TextView) layout.findViewById(R.id.textItem)).setText("Header for section " + section);

return layout;

}

}

(二)解析:

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要使用它  需要继承    SectionedBaseAdapter

重写adapter之中的 6个方法

• public Object getItem(int section, int position);

• public long getItemId(int section, int position);

• public int getSectionCount();

• public int getCountForSection(int section);

• public View getItemView(int section, int position, View convertView, ViewGroup parent);

• public View getSectionHeaderView(int section, View convertView, ViewGroup parent);

getItem(int section, int position);  //section: header的位置数  ,position:普通item的位置数

getItemId(int section, int position);  //获取item的id  第几个section的 position

getSectionCount();  //header的总数量

getCountForSection(int section);    //普通 item 的总数量

getItemView(int section, int position, View convertView, ViewGroup parent);

// 普通item 加载view的方法 类似adapter中getview() 方法

getSectionHeaderView(int section, View convertView, ViewGroup parent);

// header  item  加载view的方法 也类似adapter中getview() 方法

在使用的时候  可以使用hashmap 把list存起来   通过section 和 position 进行数据展示

也可以单独对section进行判断 展示不同的header