持久化存储(实例)

public class CalendarActivity extends Activity {
    ...
    static final int DAY_VIEW_MODE = 0;
    static final int WEEK_VIEW_MODE = 1;
    private SharedPreferences mPrefs;
    private int mCurrentViewMode;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        SharedPreferences mPrefs = getSharedPreferences("MyPrefs", MODE_PRIVATE); 
        mCurrentViewMode = mPrefs.getInt(\"view_mode\", DAY_VIEW_MODE);
    }

    protected void onPause() {
        super.onPause();
        SharedPreferences.Editor ed = mPrefs.edit();
        ed.putInt(\"view_mode\", mCurrentViewMode);
        ed.apply();
    }
}