TextView中的OnWrite

Question

我有一个TextView，我想控制用户何时插入一个字母。

Ex.

s -> search s in database and show results
st -> search st in database and show results
sta -> search sta in database and show results
stac -> search stac in database and show results
stack -> search stack in database and show results
...
...
...

我怎么能这样做？

Answer 1

用户TextWatcher在用户在EditText中输入任何文本时获取文本

searchText.addTextChangedListener(new TextWatcher() {

                public void afterTextChanged(Editable s) {

                        String text = searchText.getText().toString();
                        if (text != null && text.length() > 0) {
                                                // Call your method that will get Data from Database and then update then data to the ListView or anything you want
                            getSearchDataFromDBagianUserText(text); 
                        }

                }

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

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

                }
            });