Develop Reference

EditText.setError for a not focusable view

I want to show error for a not focusable EditText. But I can not see the message. Only red icon. Somebody says I need to request the focus manually. This is how I did:
mStartDateEditText.requestFocus();
mStartDateEditText.setError("Message");
But it doesn't work.

In my case is similar i used a TextWatcher , e.g.:
username.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) {
}
#Override
public void afterTextChanged(Editable s) {
if(s.length()==0){
username.requestFocus();
username.setError("Please enter your username.");
}else{
username.setError(null);
}
}
});

EditText monitor the cursor position

I want to use the cursor position to do something, so write this code:
input =(EditText)findViewById(R.id.Input_EditText);
input.addTextChangedListener(new TextWatcher()
{
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void afterTextChanged(Editable s)
{
int index = input.getSelectionEnd();
if(index==0)
{
//do nothing
}
else
{
Toast.makeText(MainActivity.this, Integer.toString(index), Toast.LENGTH_SHORT).show();
}
}
});
But if you press the newline key, then press the Delete key, then the program will crash
Will the problem is where?

Android App addTextChangedListner

I have a problem with my code, it's crashing for me when I have more than 1 textChangeListener.
I think that the problem is with using "new TextWatcher" more than once but I don't know what to change it to.
I'm only starting to learn java and app development so the code and variables are a bit messy.
the code:
editMiles.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) {
strMiles = 0 + editMiles.getText().toString();
intMiles = Integer.parseInt(strMiles);
editKnots.setText("" + intMiles * 1.15078);
editKilometers.setText("" + intMiles * 1.852);
}
#Override
public void afterTextChanged(Editable s) {
}
});
editBeaufort.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) {
strBeaufort = 0 + editBeaufort.getText().toString();
intBeaufort = Integer.parseInt(strBeaufort);
editKnots.setText("");
editKilometers.setText("");
editMiles.setText("");
}
#Override
public void afterTextChanged(Editable s) {
}
});
}

you have to get the input(CharSequence s) from your EditText's onTextChanged paramenter.so your code will be..
editMiles.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) {
strMiles = s.toString().trim();
intMiles = Integer.parseInt(strMiles);
editKnots.setText("" + intMiles * 1.15078);
editKilometers.setText("" + intMiles * 1.852);
}
#Override
public void afterTextChanged(Editable s) {
}
});
editBeaufort.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) {
strBeaufort = s.toString().trim();
intBeaufort = Integer.parseInt(strBeaufort);
editKnots.setText("");
editKilometers.setText("");
editMiles.setText("");
}
#Override
public void afterTextChanged(Editable s) {
}
});
}
i hope it will work for you
you have to give the correct input for your calculation, if you want to input int, you have to parse string to int, or if you want to input as double, parse string to double and throw for exception

How to get the subtraction result of two EditText in third EditText for Android?

I'm new to Android programming. While making a program I was looking for the program to auto fill the subtraction result of two EditText widgets in third EditText, without any button. Please help me to find the solution.

int firstvalue=FirstText.getText.Tostring();
int secondvalue=SecondText.getText.Tostring();
int Answer=firstvalue - secondvalue;
thirdvalue.setText(Answer);
Hope it works. If any Problem occour tell me

You can use OnEditorAction Listener Method to edit Text and do what you want when the focus change
editText2.setOnEditorActionListener(new EditText.OnEditorActionListener() {
#Override
public boolean onEditorAction(EditText v, int actionId, KeyEvent event) {
if (actionId == EditorInfo.IME_ACTION_DONE) {
//do here your stuff f
int value1=Integer.valueOf(edittext1.getText().Tostring());
int value2=Integer.valueOf(edittext2.getText().Tostring());
int value3=value1 - value2;
thirdvalue.setText(String.valueOf(value3));
return true;
}
return false;
} });

EditText e1=(EditText) findViewById(R.id.editText1);
EditText e2=(EditText) findViewById(R.id.editText2);
EditText e3=(EditText) findViewById(R.id.editText3);
e2.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before,
int count) {
if(!s.equals("") )
{
float a= Float.parseFloat(e1.getText().toString());
float b= Float.parseFloat(e2.getText().toString());
float c=a-b;
e3.setText(String.valueOf(c);
}
}
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
public void afterTextChanged(Editable s) {
}
});

Ofcourse I assume You'll do all the error handling. but this code will only if both fields are filled!.
Field1 = (EditText)findViewById(R.id.field1);
Field2 = (EditText)findViewById(R.id.field2);
Field3 = (EditText)findViewById(R.id.field3);
Field1.addTextChangedListener(new TextWatcher() {
#Override
public void afterTextChanged(Editable s) {}
#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(s.length() != 0 && Field2.getText().length() != 0)
Field3.setText(""+(Integer.parseInt(s.toString()) - Integer.parseInt(Field2.getText().toString())));
}
});
Field2.addTextChangedListener(new TextWatcher() {
#Override
public void afterTextChanged(Editable s) {}
#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(s.length() != 0 && Field1.getText().length() != 0)
Field3.setText(""+( Integer.parseInt(Field1.getText().toString()) - Integer.parseInt(s.toString())));
}
});

Not able to setTextto the EditView in the TextWatcher

I have a EditView called "text".
I have implemented textWatcher
text.addTextChangedListener(this);
Whenever i try to set EditView to some value in the TextWatcher,it is throwing Force close.
Here's the code:
public void beforeTextChanged(CharSequence s, int start, int count,int after)
{
}
public void onTextChanged(CharSequence s, int start, int before, int end)
{
//text.setText("");
}
public void afterTextChanged(Editable s)
{
//text.setText("");
}
My requirement is : Whenever the user type some value,the EditView has to set back to Null.
Please help me out.

You can do it this way:
public void beforeTextChanged(CharSequence s, int start, int count,int after) {
}
public void onTextChanged(CharSequence s, int start, int before, int end) {
}
public void afterTextChanged(Editable s){
s.clear();
}