SharedPreference沖洗或清除不工作

Question

所以這是我first.java

SharedPreferences preferences = getSharedPreferences("myPrefss", getApplicationContext().MODE_PRIVATE); 
preferences.getString(currentPlace, ""); 
SharedPreferences.Editor editor = preferences.edit(); 
editor.putString("CurrentPlace", currentPlace); 
editor.commit(); 

這是我second.java

SharedPreferences preferences = getSharedPreferences("myPrefss", getApplicationContext().MODE_PRIVATE);  
String curlocation; 
curlocation = preferences.getString("CurrentPlace",""); 

說，第一類爲輸出爲aaa第一次現在當我回去並重做這個過程時，我得到aaaaaa，字符串被追加。任何想法如何我可以避免這一點？

Answer 1

使用preferences.clear()後SharedPreferences.Editor editor = preferences.edit();

SharedPreferences preferences = getSharedPreferences("myPrefss", getApplicationContext().MODE_PRIVATE); 
SharedPreferences.Editor editor = preferences.edit(); 
editor.clear(); 
editor.putString("CurrentPlace", currentPlace); 
editor.commit(); 

Answer 2

嘗試使用

SharedPreferences preferences = getSharedPreferences("myPrefss", getApplicationContext().MODE_PRIVATE); 
//preferences.getString(currentPlace, ""); // Remove this line 
SharedPreferences.Editor editor = preferences.edit(); 
editor.putString("CurrentPlace", currentPlace); 
editor.commit();