SharedPreferences對象，傳遞資料

package mutou.test;import android.app.Activity;import android.os.Bundle;import android.widget.EditText;import android.content.SharedPreferences;public class Sample45Activity extends Activity {    EditText et;    SharedPreferences sp;    public static final String EDIT_TEXT_KEY = "EDIT_TEXT";    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                et = (EditText)this.findViewById(R.id.et);        sp = getPreferences(MODE_PRIVATE);                String result = sp.getString(EDIT_TEXT_KEY, null);                if(result != null)        {        et.setText(result);        }    }        @Override    public void onDestroy()    {    SharedPreferences.Editor editor = sp.edit();    editor.putString(EDIT_TEXT_KEY, String.valueOf(et.getText()));    editor.commit();    super.onDestroy();    }}