SharedPreferences对象，传递数据

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(); } }