Listening to EditText input in Android using TextWatcher.

Hello all…….

Here is the java code for this.

package com.coderzheaven.test;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import android.widget.Toast;

public class Test extends Activity{
	private EditText ed_txt;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ed_txt=(EditText)findViewById(R.id.EditText01);

        ed_txt.addTextChangedListener(new TextWatcher() {
        	public void afterTextChanged(Editable s) {
        		if(ed_txt.getText().toString().trim().length() > 0){
	        		if(Integer.parseInt(ed_txt.getText().toString().trim()) < 20 || Integer.parseInt(ed_txt.getText().toString().trim()) > 120){
	        			ed_txt.setTextColor(Color.GREEN);
					}else{
						Toast.makeText(getApplicationContext(), "High", Toast.LENGTH_SHORT).show();
						ed_txt.setTextColor(Color.RED);
					}
        		}
        	}

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

Here I am checking whether the input value in the edittext is between 20 and 120 if yes then change the text color to Green otherwise to Red.

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