我需要知道EditText是否被更改,而不是用户是否在字段中输入了一些文本,而只更改了if String 。
You need a TextWatcher
See it here in action:
EditText text = (EditText) findViewById(R.id.YOUR_ID);
text.addTextChangedListener(textWatcher);
private TextWatcher textWatcher = new TextWatcher() {
public void afterTextChanged(Editable s) {
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
}
If you change your mind to listen to the keystrokes you can use OnKeyListener
EditText et = (EditText) findViewById(R.id.search_box);
et.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
//key listening stuff
return false;
}
});
But Johe's answer is what you need.
This actually worked for me
EditText text = (EditText) findViewById(R.id.YOUR_ID);
text.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if(your_string.equals(String.valueOf(s))) {
//do something
}else{
//do something
}
}
@Override
public void afterTextChanged(Editable s) {
}
});
Implement a TextWatcher . It gives you three methods, beforeTextChanged
, onTextChanged
, and afterTextChanged
. The last method shouldn't be called until something changes anyway, so that's a good thing to use for it.
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