In Android how to show error in EditText

To display input error on in edit text .

Create a main.xml layout with a EditText box and a Button.
Main.xml

<?xml version="1.0" encoding="utf-8"?>  

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  

    android:orientation="vertical" android:layout_width="fill_parent"  

    android:layout_height="fill_parent">  




        <EditText android:id="@+id/editText1" 

                           android:layout_height="wrap_content"  

                           android:layout_width="match_parent" 

                           android:hint="Username"  

       / >  

        <Button android:id="@+id/button1" 

                        android:text="Register for Push Notification"  

                        android:layout_height="wrap_content" 

                        android:layout_width="wrap_content"
                  android:onClick="ErrorCheck"

                  android:text="Test It !!"


        />  

</LinearLayout> 

Now write a method in your activity "ErrorCheck" that is declired in main.xml file on Button Click .To display error you just need to check the error condition and editText.setError("your error message");

public class MainActivity extends Activity { 


EditText editText;






@Override  

    public void onCreate(Bundle savedInstanceState) {  

        super.onCreate(savedInstanceState);  

        setContentView(R.layout.main);  
        editText= (EditText) findViewById(R.id.editText1);





    }  




public void ErrorCheck(View v){




      if(editText.getText().length()==0){




          editText.setError("Please input text");




        }



}




}

Enjoy.... 

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