Android：带有TextChangedListener问题的edittext

Question

我正在将电话联系人加载到列表中并在edittext上实现TextChangedListener，如下所示

editTxt.addTextChangedListener(new TextWatcher() {

            public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {
            }

            public void afterTextChanged(Editable s) {
                final TextView noDataFound = (TextView) findViewById(R.id.norecords);
                inputName = s.toString();
                if(inputName!=null&&!inputName.trim().equals("")){

                Log.d(TAG, "LoadMoreEntries --> Constants.loadEntries : "
                        + Constants.loadEntries);

                    if (Constants.loadEntries != null) {
                        Constants.loadEntries.cancel(true);
                    }

                Constants.loadEntries = new LoadEntries();
                Constants.loadEntries.execute();
            }
                Button closesearch = (Button) findViewById(R.id.closesearch);

                if (inputName != null && !inputName.trim().equals("")) {
                    closesearch.setVisibility(View.VISIBLE);
                } else {
                    closesearch.setVisibility(View.GONE);
                }

                closesearch.setOnTouchListener(new OnTouchListener() {
                    @Override
                    public boolean onTouch(View v, MotionEvent event) {
                        if (Constants.loadEntries != null) {
                            Constants.loadEntries.cancel(true);
                Constants.loadEntries = new LoadEntries();
                Constants.loadEntries.execute();
                        }else {


            }
                        return false;
                    }
                }); 

            }
            public void onTextChanged(CharSequence s, int start, int before,
                    int count) {

            }
        });

在这里，当用户输入正确的名称时，它会给出名称，而当他输入错误的名称时，它不会显示任何数据。 我的问题是当我输入正确的名称并擦除时，整个列表已加载但当我输入错误的名称并显示时 没有数据，删除名称时，列表没有更新。在输入名称并单击该按钮后，我也有“ x ”按钮 应该拿回我所有的清单。任何帮助表示赞赏

Answer 1

使用 Google Places AutoComplete API 而不是实现 Textwatcher。当您开始输入并暂停时，Google Places AutoComplete API 非常有效，然后它会显示下拉列表，并且下拉列表会在每个字符处更新。

使用它，您可以轻松更新自动完成的下拉列表。

这是对此的解释。

editTxt.setAdapter(new PlacesAutoCompleteAdapter(this,R.layout.yourlayout));  

这里是 PlacesAutoCompleteAdapter 类，它是过滤结果并返回过滤结果。

private class PlacesAutoCompleteAdapter extends ArrayAdapter<String> implements Filterable {
    private ArrayList<String> resultList;
    private String[] myArray;

    public PlacesAutoCompleteAdapter(Context context, int textViewResourceId) {
        super(context, textViewResourceId);
    }

    @Override
    public int getCount() {
        return myArray.length;
    }

    @Override
    public String getItem(int index) {
        return myArray[index];
    }

    @Override
    public Filter getFilter() {
        Filter filter = new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults filterResults = new FilterResults();
                if (constraint != null) {
                    // Retrieve the autocomplete results.
                    myArray = autocomplete(constraint.toString());  // here we are calling myAutocomplete method.                    
                    // Assign the data to the FilterResults
                    filterResults.values = myArray;
                    filterResults.count = myArray.length;
                }
                return filterResults;
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                if (results != null && results.count > 0) {
                    notifyDataSetChanged();
                }
                else {
                    notifyDataSetInvalidated();
                }
            }};
        return filter;
    }
}   

private String[] autocomplete(String dropdownString) {
    ArrayList<String> resultList = null;
    StringBuilder jsonResults = new StringBuilder();
    String term;

    try {
        term=URLEncoder.encode(dropdownString, "utf8");
    } catch (Exception e) {
        e.printStackTrace();
        term = dropdownString;
    }

    StringBuilder sb = new StringBuilder(PLACES_API_BASE + TYPE_AUTOCOMPLETE);  
    sb.append("?param="+param1+"); // this is parameter if your getting data from server.        
    sb.append("&term="+term); // this term which you typing in edittext.  
    String url = sb.toString();

        // you can do here anything with your list. get it and populate it.   

    return myArray;
}

PLACES_API_BASE:- here is url if you are getting data from Web(in my example www.myurl/myapp).
TYPE_AUTOCOMPLETE:- file name or exact location from where are you getting data(in my example abc.php).
如果您有任何疑问问我。不要犹豫。