我怎样才能在我的Android应用程序查询我的MYSQL数据库，而无需按搜索

Question

我有一个工作的搜索功能，插入搜索结果到微调，但我希望它是没有需要按搜索按钮就像谷歌。 事情是这样的：

Answer 1

嗯，首先，你需要使用一个AutoCompleteTextView，即每次触发一个过滤器，文本更改，并根据您附加的图像精确显示建议。

然后，你必须是你的自定义适配器，并把它添加到您的视图在你的活动你的onCreate功能：从

protected void onCreate(Bundle savedInstanceState) { 
    ... 

    AutomaticSearchAdapter adapter = new AutomaticSearchAdapter(this, new ArrayList<CustomObject>(), ""); 
    listView = (AutoCompleteTextView) findViewById(R.id.search_complete); 
    listView.setThreshold(1); 
    listView.setAdapter(adapter); 

    ... 
} 

下面是如何构建自定义适配器的模板，该载荷数据任何API和根据您自己的过滤标准建议

public class AutomaticSearchAdapter extends ArrayAdapter implements AsyncResponse, Filterable { 
    private ArrayList<ContactItem> realList; // The list that will be shown 
    private ArrayList<CustomObject> results = new ArrayList<CustomObject>(); // A list with all data from your API 

    private Filter mFilter = new Filter(){ 
     @Override 
     protected FilterResults performFiltering(CharSequence constraint) { 
      FilterResults filterResults = new FilterResults(); 
      if(constraint != null) { 
       String constraintTrim = ContactSearchAdapter.toPlain(constraint.toString()).trim().toLowerCase(); 


     // When te user introduces at least 3 characteres, get data from your API 
       if (constraintTrim.length() == 3) { 
      // Call Here to you API, and populate results 
       } 

     ArrayList<CustomObject> suggestions = new ArrayList<CustomObject>(); 
       for (CustomObject object : results) { 
      if(/*some condition on your downloaded datum */) { 
       suggestions.add(object); 
      } 
       } 

       filterResults.values = suggestions; 
       filterResults.count = suggestions.size(); 
      } 

      return filterResults; 
     } 

     @Override 
     protected void publishResults(CharSequence contraint, FilterResults results) { 
      if(results == null){ 
       return; 
      } 

      try { 
       realList.clear(); 
       if (results.values != null){ 
        realList.addAll((List<CustomObject>) results.values); 
       } 
       notifyDataSetChanged(); 
      }catch (Exception e) { 

      } 
     } 
    }; 


    public int getCount() { 
     return realList.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     try { 
      if (realList.size() > 0) { 
       return realList.get(position); 
      }else { 
       return null; 
      } 
     }catch (Exception ex) { 
      return null; 
     } 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 


    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 
    // HERE MUST BE YOUR CUSTOM getView FROM YOUR LIST 
     // YOU CAN LEARN MORE ABOUT http://androidexample.com/How_To_Create_A_Custom_Listview_-_Android_Example/index.php?view=article_discription&aid=67 

     return convertView; 
    } 

    @Override 
    public void postStart() { 
     //Nothing to do. 
    } 


    @Override 
    public Filter getFilter() { 
     return mFilter; 
    } 
} 

当然，您将需要重构上面的代码以满足自己的需求。

Answer 2

我bevieve你需要的是一个onTextChanged监听到这里看看https://developer.android.com/reference/android/text/TextWatcher.html