How to Use Edittext Ontextchanged Event When I Press the Number

How to use EditText onTextChanged event when I press the number?

You have selected correct approach. You have to extend the class with TextWatcher and override afterTextChanged(),beforeTextChanged(), onTextChanged().

You have to write your desired logic in afterTextChanged() method to achieve functionality needed by you.

How to Apply the Textchange event on EditText

I think you are receiving empty String " " which is causing this problem. Make sure you get a non-empty String from your EditText.

Consider your EditText doesn't have any value typed in, and you are trying to get its value and convert into int you will run into this kind of problem.

edittext.addTextChangedListener(new TextWatcher() {

    public void onTextChanged(CharSequence s, int start, int before,
            int count) {
            if(!s.equals("") ) { 
                //do your work here 
            }
    }

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

    }

    public void afterTextChanged(Editable s) {

    }
});

Also check this link for more idea,

https://stackoverflow.com/a/3377648/603744

android on Text Change Listener

You can add a check to only clear when the text in the field is not empty (i.e when the length is different than 0).

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.setText("");
   }
  });

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.setText("");
   }
  });

Documentation for TextWatcher here.

Also please respect naming conventions.

Detecting an onTextChanged event in dot42

This would be a minimal implementation. I hope it helps you see a pattern in the difference between Java and C# - it is really trivial.

   [Activity]
   public class MainActivity : Activity, Android.Text.ITextWatcher
   {
      protected override void OnCreate(Bundle savedInstance)
      {
         base.OnCreate(savedInstance);
         SetContentView(R.Layouts.MainLayout);

         EditText editText = FindViewById<EditText>(R.Ids.status);
         editText.AddTextChangedListener(this);
      }

      public void AfterTextChanged(Android.Text.IEditable s)
      {
         throw new NotImplementedException();
      }

      public void BeforeTextChanged(Java.Lang.ICharSequence s, int start, int count, int after)
      {
         throw new NotImplementedException();
      }

      public void OnTextChanged(Java.Lang.ICharSequence s, int start, int before, int count)
      {
         throw new NotImplementedException();
      }
   }

The interface implementation is generated by Visual Studio.

Proper method to change EditText contents in OnTextChanged event

You are doing the wrong way. Instead, use this in your EditText:

<EditText
    ....
    android:hint="Type to compose"/>

The OS will take care of removing that text, and you won't have to workaround that. Also, it will look prettier.

android edittext onchange listener

First, you can see if the user finished editing the text if the EditText loses focus or if the user presses the done button (this depends on your implementation and on what fits the best for you).
Second, you can't get an EditText instance within the TextWatcher only if you have declared the EditText as an instance object. Even though you shouldn't edit the EditText within the TextWatcher because it is not safe.

EDIT:

To be able to get the EditText instance into your TextWatcher implementation, you should try something like this:

public class YourClass extends Activity {

    private EditText yourEditText;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);
        yourEditText = (EditText) findViewById(R.id.yourEditTextId);

        yourEditText.addTextChangedListener(new TextWatcher() {

            public void afterTextChanged(Editable s) {

                // you can call or do what you want with your EditText here

                // yourEditText... 
            }

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

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

Note that the above sample might have some errors but I just wanted to show you an example.

onTextChanged event doesn't work in Android

Maybe this helps:

if (!isChangedProgramatically) {
    String num = editText.getText().toString();
    if(!num.isEmpty()) {
        String str = num.replace(",", "");
        double x = Double.parseDouble(str);
        String text = NumberFormat.getIntegerInstance(Locale.US).format(x);

        isChangedProgramatically = true;
        editText.setText(text);
    }
} else {
    editText.setSelection(editText.getText().length());
    isChangedProgramatically = false;
}

isChangedProgramatically is a private boolean (default false) of your Activity.

How to handle Number Format Exception in edittext OntextChanged

When you remove everything on your editText, editText will return an empty string. Hence you will get NPE and also Number Format Exception.

You can handle like this:

if(!viewHolder.edt_product_qty.getText().toString().equals("")){
   quantity_count= Integer.parseInt(viewHolder.edt_product_qty.getText().toString()); 
   buyNowList(user_id,"UserCart",0,stList.get(position).getCartList1().getId(),stList.get(position).getCartList1().getProdSku(),stList.get(position).getCartList1().getProdId(),quantity_count,0,qty_status,stList.get(position).getCartList1().getProdPrice());
}

To compare initial value with current value

First you need to assign a variable as initial value in beforeTextChanged.

initalValue =viewHolder.edt_product_qty.getText().toString();

Then in onTextChanged:

if(!viewHolder.edt_product_qty.getText().toString().equals("")){
    quantity_count = Integer.parseInt(viewHolder.edt_product_qty.getText().toString()); // 
}if(initalValue>quantity_count)
{
    // code
}else
{
    //code
}

Have a look on this https://stackoverflow.com/a/20278708/5156075

android EditText - finished typing event

When the user has finished editing, s/he will press Done or Enter

((EditText)findViewById(R.id.youredittext)).setOnEditorActionListener(
    new EditText.OnEditorActionListener() {
        @Override
        public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
            if (actionId == EditorInfo.IME_ACTION_SEARCH ||
                    actionId == EditorInfo.IME_ACTION_DONE ||
                    event != null &&
                    event.getAction() == KeyEvent.ACTION_DOWN &&
                    event.getKeyCode() == KeyEvent.KEYCODE_ENTER) {
                if (event == null || !event.isShiftPressed()) {
                   // the user is done typing. 

                   return true; // consume.
                }                
            }
            return false; // pass on to other listeners. 
        }
    }
);

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