Android 水平的ListView

Android Horizontal ListViewPosted by paul on March 7, 2011

Due popularity, I have decided to create a GitHub repo for this project. Please checkout the code at:
http://github.com/dinocore1/Android-Horizontal-ListView Pull requests are welcome!

Licensed under MIT License Copyright (c) 2011 Paul Soucy, (paul+blog@dev-smart.com)

The Android API seems to be lacking a Horizontal ListView widget. Basically, what I needed was something exactly like the Gallery widget but without the center-locking feature. After much googling (and finding dead ends

like this or
this), I eventually came to the conclusion that a Horizontal ListView simply did not exist. So I built my own…

My Android Horizontal ListView implementation has the following features:

• Subclass AdapterView so I can make use of adapters
• Fast – make use of recycled views when possible
• Items are clickable – (accepts AdapterView.OnItemClickListener)
• Scrollable
• No center-locking
• Simple – is that so much to ask?

If you find this helpful, let me know, I would love to hear your feedback.

How to use:
Horizontal ListView is ment to be a drop-in replacement for a standard ListView. Here is some quick demo code to get you started:

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1. package com.devsmart.android.test;  
2.   
3. import android.app.Activity;  
4. import android.os.Bundle;  
5. import android.view.LayoutInflater;  
6. import android.view.View;  
7. import android.view.ViewGroup;  
8. import android.widget.BaseAdapter;  
9. import android.widget.TextView;  
10.   
11. import com.devsmart.android.ui.HorizontialListView;  
12.   
13. public class HorizontalListViewDemo extends Activity {  
14.   
15.     @Override  
16.     protected void onCreate(Bundle savedInstanceState) {  
17.         super.onCreate(savedInstanceState);  
18.   
19.         setContentView(R.layout.listviewdemo);  
20.   
21.         HorizontialListView listview = (HorizontialListView) findViewById(R.id.listview);  
22.         listview.setAdapter(mAdapter);  
23.   
24.     }  
25.   
26.     private static String[] dataObjects = new String[]{ "Text #1",  
27.         "Text #2",  
28.         "Text #3" };   
29.   
30.     private BaseAdapter mAdapter = new BaseAdapter() {  
31.   
32.         @Override  
33.         public int getCount() {  
34.             return dataObjects.length;  
35.         }  
36.   
37.         @Override  
38.         public Object getItem(int position) {  
39.             return null;  
40.         }  
41.   
42.         @Override  
43.         public long getItemId(int position) {  
44.             return 0;  
45.         }  
46.   
47.         @Override  
48.         public View getView(int position, View convertView, ViewGroup parent) {  
49.             View retval = LayoutInflater.from(parent.getContext()).inflate(R.layout.viewitem, null);  
50.             TextView title = (TextView) retval.findViewById(R.id.title);  
51.             title.setText(dataObjects[position]);  
52.   
53.             return retval;  
54.         }  
55.   
56.     };  
57.   
58. }  

res/layout/listviewdemo.xml:

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1. <!--?xml version="1.0" encoding="utf-8"?-->  
2. <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#fff">  
3.   
4.   <com.devsmart.android.ui.horizontiallistview android:id="@+id/listview" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="#ddd">  
5.   
6. </com.devsmart.android.ui.horizontiallistview></linearlayout>  

res/layout/listitem.xml:

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1. <!--?xml version="1.0" encoding="utf-8"?-->  
2. <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#fff">  
3.   
4.   <imageview android:id="@+id/image" android:layout_width="150dip" android:layout_height="150dip" android:scaletype="centerCrop" android:src="@drawable/icon">  
5.   
6.     <textview android:id="@+id/title" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textcolor="#000" android:gravity="center_horizontal">  
7.   
8. </textview></imageview></linearlayout>  

Download code here
Horizontal Listview (1931)

Changelist
1.5:
adapter.notifyDataSetChanged() now saves position in list instead of starting at begining

1.4:
Added code to respond to adapter.notifyDataSetChanged()

1.3:
added mScroller.forceFinished(true); to the onDown function of mOnGesture so the user con stop the scroll on tap.