使用EditText对ListView进行过滤，并作拼音匹配

通过EditText中的输入，实现ListView过滤，主要是让adapter实现Filterable接口。可以参考SimpleAdapter的实现方式。

至于拼音过滤，在google code中有一个pinyin4android的开源项目，已经实现了对中文拼音的匹配。

效果图:

定义一个UserAdapter，对user的name字段进行过滤：

public class UserAdapter extends BaseAdapter implements Filterable{
		private List<User> users;
		public Context mContext;
		private LayoutInflater mInflater;
		private FilterDemo mFilter;
		private ArrayList<User> mDisplayData;
		//记录索引
		private ArrayList<FilterIndex> mFilterIndexs;
		
		public UserAdapter(Context context, List<User> users)
		{
			super();
			
			mContext = context;
			
			this.users = users;
			
			mDisplayData = (ArrayList<User>) users;
			
			mFilterIndexs = new ArrayList<FilterIndex>();
			mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		}
		
		@Override
		public int getCount()
		{
			// TODO Auto-generated method stub
			return mDisplayData.size();
		}

		@Override
		public Object getItem(int position)
		{
			// TODO Auto-generated method stub
			
			return mDisplayData.get(position);
		}

		@Override
		public long getItemId(int position)
		{
			// TODO Auto-generated method stub
			return mDisplayData.get(position).getId();
		}

		@Override
		public View getView(final int position, View convertView, ViewGroup parent)
		{
			// TODO Auto-generated method stub

			if (convertView == null)
			  convertView = mInflater.inflate(R.layout.item, null);
			
			ViewHolder holder = new ViewHolder();
			holder.name = (TextView) convertView.findViewById(R.id.name); 
			holder.age = (TextView) convertView.findViewById(R.id.age);
			
			User user = mDisplayData.get(position);
	        
			SpannableStringBuilder ss=new SpannableStringBuilder(user.getName());
			if(!mFilterIndexs.isEmpty())
			  ss.setSpan(new ForegroundColorSpan(Color.RED),mFilterIndexs.get(position).getBegin(),mFilterIndexs.get(position).getEnd(),Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
			  
			holder.name.setText(ss);
			holder.age.setText(user.getAge()+"");

			return convertView;

		}
		
		
		static class ViewHolder
		{
			TextView name;
			TextView age;
			
		}

		@Override
		public Filter getFilter()
		{
			// TODO Auto-generated method stub
			if (mFilter == null) {
	            mFilter = new FilterDemo();
	        }
	        return mFilter;
		}
		private class FilterDemo extends Filter {

	        @Override
	        protected FilterResults performFiltering(CharSequence prefix) {
	            FilterResults results = new FilterResults();
	            
	            ArrayList<String> mData = new ArrayList<String>();
	            
	            mFilterIndexs.clear();
	           
	            for(int i = 0; i < users.size(); i ++){
	                	String name = users.get(i).getName();
	                	mData.add(name);
	            }
	           
	            if (prefix == null || prefix.length() == 0) {
	            
	                results.values = mData;
	                results.count = mData.size();
	            
	            } else {
	                String prefixString = prefix.toString();
	                
	                int count = mData.size();

	                ArrayList<String> newValues = new ArrayList<String>(count);
	                
	                for (int j = 0; j < count; j++) {
	     
	                     String s = mData.get(j);
	                    
	                    //
	                    String s1 = getPinYinHeadChar(s);
	                     
	                    if(s1.contains(prefixString))
	                    {
	                         getFilterIndex(s1,prefixString);
	                		 newValues.add(s);
	                     }else
	                     if(s.contains(prefixString))
	                    {
	                   	     getFilterIndex(s,prefixString);
	                    	 newValues.add(s);
	                    }
	                      
	                }
	             
	                results.values = newValues;
	                results.count = newValues.size();
	            }
	            
	            return results;
	        }
	        @SuppressWarnings("unchecked")
			@Override
	        protected void publishResults(CharSequence constraint, FilterResults results) {
	        
	            	mDisplayData = new ArrayList<User>(results.count);
	            	
	            	for(String username:(ArrayList<String>)results.values)
	            	{
	            		  for(User userInfo:users)
	            		  {
	            			  if(userInfo.getName().equals(username)){
	            				  
	            				  mDisplayData.add(userInfo);
	            			  }
	            		  }
	            	}
	            	
	                notifyDataSetChanged();
	         
	        }
	        
	      //提取汉字的首字母
	        private String getPinYinHeadChar(String str) {
	           StringBuilder convert = new StringBuilder();
	           int length = str.length();
	           for (int j = 0; j < length; j++) {
	               char word = str.charAt(j);
	    			try {
	    				
	    				String pinyinArray = PinyinUtil.toPinyin(mContext, word);
	    				
	    				if (pinyinArray != null) {
	    	                convert.append(pinyinArray.charAt(0));
	    	            } else {
	    	                convert.append(word);
	    	            }
	    				
	    			} catch (Exception e) {
	    				e.printStackTrace();
	    			}
	              
	           }

	           return convert.toString();
	       }
	       
	        /**
	         * 获取指定字符的开始与结束的位置
	         */
	       private void getFilterIndex(String father,String child)
	       {
	    	   int start = father.indexOf(child);
	    	   int end = start+child.length();
	    	   FilterIndex filterIndex = new FilterIndex(start,end);
	    	   mFilterIndexs.add(filterIndex);
	    	   
	       }
	       
	}
		   class FilterIndex
		   {
			   private int begin;
			   private int end;
			   
			   public FilterIndex(int begin,int end)
			   {
				   this.begin = begin;
				   this.end = end;
			   }

			public int getBegin() {
				return begin;
			}

			public void setBegin(int begin) {
				this.begin = begin;
			}

			public int getEnd() {
				return end;
			}

			public void setEnd(int end) {
				this.end = end;
			}
			   
		   }
	}

然后再Activity中使用该adapter,为EditText添加addTextChangedListener:

private ListView mListView;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        initComponent();
    }
	private void initComponent() {
		// TODO Auto-generated method stub
		EditText edit = (EditText) findViewById(R.id.edit);
		mListView = (ListView) findViewById(R.id.list_view);
		List<User> users = new ArrayList<User>();
		users.add(0, new User("zhangsan", 20));
		users.add(1, new User("lishi", 21));
		users.add(1, new User("wangwu", 21));
		users.add(1, new User("zhaoliu", 21));
		users.add(1, new User("xiaoming", 21));
		users.add(1, new User("daming", 21));
		final UserAdapter adapter = new UserAdapter(this, users);
		mListView.setAdapter(adapter);
		edit.addTextChangedListener(new TextWatcher() {
			
			@Override
			public void onTextChanged(CharSequence s, int start, int before, int count) {
				// TODO Auto-generated method stub
				
			}
			
			@Override
			public void beforeTextChanged(CharSequence s, int start, int count,
					int after) {
				// TODO Auto-generated method stub
				
			}
			
			@Override
			public void afterTextChanged(Editable s) {
				// TODO Auto-generated method stub
				adapter.getFilter().filter(s);
			}
		});
	}