下拉式選單_預設選項

利用 SharedPreferences 記憶前一次的選項並回復

部分元件接續 預設下拉式 內文  

Activity

Public static final String PREF = "BMI_PREF";

Public static final String PREF_FEET = "BMI_Feet";

@Override

protected void onCreate(Bundle savedInstanceState) {

/*…………………..*/

RestorePrefs();

}

private restorePrefs(){

SharedPreferences setting = getSharedPreferences(PREF, 0);

Integer pref_feet = setting.getInt(PREF_FEET, 5);

field_feet.requestFocus(pref_feet);

Field_feet.setSelection(pref_feet);

}

protected void onPause(){

Super.onPause();

SharedPreferences setting = getSharedPreferences(PREF, 3);

setting.edit()

.putInt(PREF_FEET, field_feet.getSelectedItemPosition())

.commit();

}