紙團部屋: 11月 2018

2018年11月10日星期六

[Android]sharedPreferences範例(改良版)

因為有時會用到就放這邊參考

public void SavePref(String keyname, String value) {
    SharedPreferences sharedPreferences = getPreferences(MainActivity.MODE_PRIVATE);    SharedPreferences.Editor editor = sharedPreferences.edit();    editor.putString(keyname, value);    editor.commit();}
public String GetPref(String keyname) {
    SharedPreferences sharedPreferences = getPreferences(MainActivity.MODE_PRIVATE);    return sharedPreferences.getString(keyname, "");}

SavePref("02","111111");

SavePref("02","222222");

SavePref("02","333333");
Log.d("---------", GetPref("01"));
Log.d("---------", GetPref("02"));

執行結果，02的值是可以取代的

[Android]記錄ListView點選位置

https://blog.csdn.net/u013168615/article/details/51479716

//記錄ListView點選位置private void saveListViewPositionAndTop() {
    firstVisiblePosition = lv.getFirstVisiblePosition();    View item = lv.getChildAt(0);    firstVisiblePositionTop = (item == null) ? 0 : item.getTop();}

// 恢复现在ListView的位置，(上一次保存的位置)
lv.setSelectionFromTop(firstVisiblePosition, firstVisiblePositionTop);


使用方式：
1、在onItemClick加這個：

saveListViewPositionAndTop();

2、在setAdapter加上setSelectionFromTop

lv.setAdapter(adapter);lv.setSelectionFromTop(firstVisiblePosition, firstVisiblePositionTop);

[JAVA]千分位符號

//測試千分符號int tempa = 100000;int tempb = 10000;NumberFormat numberFormat1 = NumberFormat.getNumberInstance();Log.d("---------",numberFormat1.format(tempa));Log.d("---------",numberFormat1.format(tempb));