Android PinnedHeaderListView 详解
Android PinnedHeaderListView 使用详解
PinnedHeaderListView 提供一些 钉头 会定在头部
它看起来像是 应用程序在Android 4.0以上的联系人 能够平滑的悬浮
下载后导入 编辑工具里 libray 只有2个类
PinnedHeaderListView.java
SectionedBaseAdapter.java
(一) 使用:
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> </LinearLayout>
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
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:
要使用它 需要继承 SectionedBaseAdapter
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
最后神兽镇楼
//┏┓ ┏┓ //┏┛┻━━━┛┻┓ //┃ ┃ //┃ ━ ┃ //┃ ┳┛ ┗┳ ┃ //┃ ┃ //┃ ┻ ┃ //┃ ┃ //┗━┓ ┏━┛ // ┃ ┃ 神兽保佑 // ┃ ┃ 代码无BUG! // ┃ ┗━━━┓ // ┃ ┣┓ // ┃ ┏┛ // ┗┓┓┏━┳┓┏┛ // ┃┫┫ ┃┫┫ // ┗┻┛ ┗┻┛
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