How to make a landing button does not fill in username and password when pressed no way

            
How to make a landing button does not fill in username and password when pressed no way
Reply:
Input box is edittext right? Assumption is mUserNameEditText. Buttons assumption is mLoginButton
if (mUserNameEditText.getEditableText (). toString (). equals ("")) {
mLoginButton.setEnable (false);
}

Reply:
btn.setOnClickListener (new OnClickListener {
public void onClick (View v) {
if (/ / if user name password is blank) {
return;
} Else {
/ / Login
}
}
});
Reply:
You can use the edittext of addTextChangedListener event listener

 editText.addTextChangedListener (new TextWatcher () {

public void afterTextChanged (Editable s) {
/ / TODO Auto-generated method stub 
/ / S: after changing all characters 
Toast.makeText (getApplicationContext (), "change:" + s, Toast.LENGTH_SHORT) show (); 
.} 

public void beforeTextChanged (CharSequence s, int start, int count, 
int after) {
/ / TODO Auto-generated method stub 
/ / S: all the characters before the change; start: the position of the character begins; count: The total number of bytes before the change; after: after changing the number of bytes 
Toast.makeText (getApplicationContext (), "before the change:" + s + ";" + start + ";" + count + ";" + after, Toast.LENGTH_SHORT). Show (); 
} 

public void onTextChanged (CharSequence s, int start, int before, 
int count) {
/ / TODO Auto-generated method stub 
/ / S: all the characters after the change; start: character starting position; before: the total number of bytes before the change; count: the number of bytes 
 after changeToast.makeText. (GetApplicationContext (), "after the change:" + s + ";" + start + ";" + before + ";" + count, Toast.LENGTH_SHORT) show (); 
} 

});