Alert dialogue with checkbox should appear only when check box is unchecked

package com.example.callingintent;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {

    public String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    protected static final int REQUEST_CODE = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        EditText edt1 = (EditText) findViewById(R.id.editText1);
        Button button1 = (Button) findViewById(R.id.button1);
        EditText et1 = (EditText) findViewById(R.id.editText1);
        et1.setText(getName());
        button1.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub

                Intent myintent = new Intent(MainActivity.this,
                        secondActivity.class);
                myintent.putExtra("name", "namratha");
                myintent.putExtra("Id", 1);
                // startActivity(myintent);
                startActivityForResult(myintent, REQUEST_CODE);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        String returnString;
        if (resultCode == RESULT_OK && requestCode == REQUEST_CODE) {
            if (data.hasExtra("returnString1")) {
                returnString = data.getExtras().getString("returnString1");
                System.out.println("return string is   " + returnString);
                setName(returnString);

            }
        }

    }

}




package com.example.callingintent;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;

public class secondActivity extends Activity {
    public static final String PREFS_NAME = "MyPrefsFile1";
    public CheckBox dontShowAgain;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
        EditText et1 = (EditText) findViewById(R.id.editText1);
        EditText et2 = (EditText) findViewById(R.id.editText2);
        Bundle mydata = getIntent().getExtras();
        if (mydata != null) {
            String name = mydata.getString("name");
            int id = mydata.getInt("Id");
            System.out.println("id is " + id);

            et1.setText(name);
            // et1.setText(id);

        }

        AlertDialog.Builder adb = new AlertDialog.Builder(this);
        LayoutInflater adbInflater = LayoutInflater.from(this);
        View eulaLayout = adbInflater.inflate(R.layout.checkbox, null);
        dontShowAgain = (CheckBox) eulaLayout.findViewById(R.id.skip);
        adb.setView(eulaLayout);
        adb.setTitle("Attention");
        adb.setMessage(Html.fromHtml("Message"));
        adb.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                String checkBoxResult = "NOT checked";
                if (dontShowAgain.isChecked())
                    checkBoxResult = "checked";
                SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
                SharedPreferences.Editor editor = settings.edit();
                editor.putString("skipMessage", checkBoxResult);
                // Commit the edits!
                editor.commit();
                return;
            }
        });
        SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
        String skipMessage = settings.getString("skipMessage", "NOT checked");
        if (skipMessage != "checked")
            adb.show();

    }

    public void finish() {
        Intent data = new Intent();

        data.putExtra("returnString1", "Message to parent activity");
        setResult(RESULT_OK, data);
        super.finish();

    }

}



activity_main.xml
-------------------------
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="44dp"
        android:text="Button" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button1"
        android:layout_marginTop="33dp"
        android:layout_toLeftOf="@+id/textView1"
        android:ems="10" >

        <requestFocus />
    </EditText>

</RelativeLayout>


checkbox.xml
-------------------------------
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout_root"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    android:padding="10dp" >

    <CheckBox
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/skip"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Do not show again" >
    </CheckBox>

</LinearLayout>

second.xml
--------------------------
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="Hello Second Activity"
        tools:context=".MainActivity" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="36dp"
        android:layout_marginTop="36dp"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_below="@+id/editText1"
        android:layout_marginLeft="21dp"
        android:layout_marginTop="20dp"
        android:ems="10" />

</RelativeLayout>