Need help in customizing default keyboard

I am working on Custom keyboard app i need to set or change background theme or color of keyboard .their setting.xml view in my app where user can select different background theme and different color for key rows. during first time launch of application it is working fine but next time when custom keyboard is displaying theme is not changed.

I am Am Using this code:-

public class SoftKeyboard extends InputMethodService
implements KeyboardView.OnKeyboardActionListener {
static final boolean DEBUG = false;

/**
* This boolean indicates the optional example code for performing
* processing of hard keys in addition to regular text generation
* from on-screen interaction. It would be used for input methods that
* perform language translations (such as converting text entered on
* a QWERTY keyboard to Chinese), but may not be used for input methods
* that are primarily intended to be used for on-screen text entry.
*/
static final boolean PROCESS_HARD_KEYS = true;

private static final int SELECT_PICTURE = 101;

private KeyboardView mInputView;
private CandidateView mCandidateView;
private CompletionInfo[] mCompletions;
private Context context = SoftKeyboard.this;
private StringBuilder mComposing = new StringBuilder();
private boolean mPredictionOn;
private boolean mCompletionOn;
private int mLastDisplayWidth;
private boolean mCapsLock;
private long mLastShiftTime;
private long mMetaState;

private LatinKeyboard mSymbolsKeyboard;
private LatinKeyboard mSymbolsShiftedKeyboard;
private LatinKeyboard mQwertyKeyboard;
private LatinKeyboard mSmilyKeyboard;
private LatinKeyboard mSmilyKeyboard1;

private LatinKeyboard mCurKeyboard;

private String mWordSeparators;

/**
* Main initialization of the input method component. Be sure to call
* to super class.
*/

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

mWordSeparators = getResources().getString(R.string.word_separators);
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
String name = preferences.getString("Name","");


Log.e("SoftKeyboard - ",""+name+"OnCreate Method Called--");



if(!name.equalsIgnoreCase(""))
{
name = name+" Sethi"; /* Edit the value here*/
}
}

And This is my Setting Class where i am setting or selecting color or theme:--

public class Setting extends Activity implements OnClickListener {

LinearLayout roar, edge, burst, impact, blue_theme, orange_theme,
green_theme, black_brigthness, white_brightness;

Bundle bundle;

public static boolean isblackBrightness = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.setting);

// ----------UI intilisation---------------------
uiInitilisation();

}

public void uiInitilisation() {

roar = (LinearLayout) findViewById(R.id.ror_LL);
edge = (LinearLayout) findViewById(R.id.edge_LL);
burst = (LinearLayout) findViewById(R.id.burst_LL);
impact = (LinearLayout) findViewById(R.id.impact_LL);

// -------------Themes------------------------------
blue_theme = (LinearLayout) findViewById(R.id.blue_theme_LL);
orange_theme = (LinearLayout) findViewById(R.id.orange_theme_LL);
green_theme = (LinearLayout) findViewById(R.id.green_theme_LL);

// ------------Brightness----------------------------
black_brigthness = (LinearLayout) findViewById(R.id.black_brigthness_LL);
white_brightness = (LinearLayout) findViewById(R.id.white_brigthness_LL);

// --------------On Click Events-------------------

roar.setOnClickListener(this);
edge.setOnClickListener(this);
burst.setOnClickListener(this);
impact.setOnClickListener(this);

// -----------Theme-------------------------------------
blue_theme.setOnClickListener(this);
orange_theme.setOnClickListener(this);
green_theme.setOnClickListener(this);

// ------------------Brightness--------------------------
black_brigthness.setOnClickListener(this);
white_brightness.setOnClickListener(this);

}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.ror_LL:

startActivity(new Intent(Setting.this, MainActivity.class));

break;

case R.id.edge_LL:

startActivity(new Intent(Setting.this, MainActivity.class));




break;
case R.id.burst_LL:

startActivity(new Intent(Setting.this, MainActivity.class));

break;

case R.id.impact_LL:

startActivity(new Intent(Setting.this, MainActivity.class));

break;

case R.id.blue_theme_LL:

Intent i = new Intent(Setting.this,
MainActivity.class);
i.putExtra("color", "blue");

startActivity(i);


break;

case R.id.orange_theme_LL:
Intent i2 = new Intent(Setting.this,
MainActivity.class);
i2.putExtra("color", "orange");

startActivity(i2);

break;

case R.id.green_theme_LL:
Intent i3 = new Intent(Setting.this,
MainActivity.class);
i3.putExtra("color", "green");

startActivity(i3);

break;
case R.id.black_brigthness_LL:

Intent black_britness = new Intent(Setting.this,
MainActivity.class);
black_britness.putExtra("bright", "black");
startActivity(black_britness);

SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = preferences.edit();
editor.putString("Name","Harneet");
editor.commit();


isblackBrightness = true ;
Log.e("Black--","Black=="+isblackBrightness);

break;
case R.id.white_brigthness_LL:
Intent white_britness = new Intent(Setting.this,
MainActivity.class);
white_britness.putExtra("bright", "white");
startActivity(white_britness);
isblackBrightness = false;
Log.e("white--","White=="+isblackBrightness);

SharedPreferences preferences1 = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor1 = preferences1.edit();
editor1.putString("Name","Arun");
editor1.commit();


break;

}
}

I am not sure how this could be achieved. Do I need to set a widget? I need solution urgently. Please provide help.