Android รบกวนด้วยคร้าบบบบ SharedPreferences ทำงานแล้วแต่ไม่รู้จะใส่ ฟังกชั่นการทำงานอย่างไรดี

import com.google.android.gms.maps.GoogleMap;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

public class Steting extends Activity {

	private CheckBox checkBox;
	private TextView textView;
	Context context = this;
	private Button button;
	GoogleMap mMap;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main_sharepreferrence);
		checkBox = (CheckBox) findViewById(R.id.Chk1);
		textView = (TextView) findViewById(R.id.Txout);
		LoadPrefs();
		button=(Button) findViewById(R.id.button1);
		button.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Member();
			}
		});
		
		
		
	}
	

	private void LoadPrefs(){
		
        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
        boolean cbvalue =  sharedPreferences .getBoolean("CHECKBOX", false);
        String string = sharedPreferences.getString("Show","Can't Checking");
        if (cbvalue){
        	checkBox.setChecked(true);
      
        }else{
         	checkBox.setChecked(false);
         
        
        }
        textView.setText(string);
	}
	private void SavePrefs(String string,boolean value){
		
		SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
		Editor editor = sharedPreferences.edit();
		editor.putBoolean(string, value);
		editor.commit();
		
	}
	
//////////////////////////////////////////////// Prefer Stage String ///////////////////////////////////////////////////////////////	
	private void SavePrefs(String string,String value){
		
		SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
		Editor editor = sharedPreferences.edit();
		editor.putString(string, value);
		editor.commit();
	}
	
//////////////////////////////////////////////// Event Stage //////////////////////////////////////////////////////////////////	
	
	private void Member(){
	final String CK = "Traffic Open";
	final String UNCK  = "Traffic Closed!!";
		SavePrefs("CHECKBOX",checkBox.isChecked());
		
		if(checkBox.isChecked()){				
			textView.setText(""+CK);
			SavePrefs("Show",textView.getText().toString());
		Toast.makeText(context, "Traffic Open", Toast.LENGTH_SHORT).show();
		
		}
		else{
		textView.setText(""+UNCK);
		SavePrefs("Show",textView.getText().toString());
		Toast.makeText(context, "Traffic Closed!!", Toast.LENGTH_SHORT).show();	
		}
				
		
	}
}