android保存ArrayList到本地並顯示（重複的問題已解決）

/**
* 保存數組到sp裏
*/
public void saveSearch(String content) {

//searchList裏沒有數據就直接存
if (searchList.size() == 0) {
searchList.add(content + "");
} else {
//searchList裏有數據，且沒有這條數據，直接在0的位置加上這條數據
if (!searchList.contains(content)) {
searchList.add(0, content + "");
} else {
for (int i = 0; i < searchList.size(); i++) {
if (searchList.get(i).equals(content)) {
//searchList裏有數據，也有這條數據，就把原來的這條數據清掉，在0的位置加上這條數據
searchList.remove(i);
searchList.add(0, content + "");
}
}
}
}

SharedPreferences.Editor editor = getSharedPreferences(
"SearchDataList", MODE_PRIVATE).edit();

editor.putInt("searchNums", searchList.size());
for (int i = 0; i < searchList.size(); i++) {
editor.putString("item_" + i, searchList.get(i));
}
editor.commit();
}

/**
* 讀取sp裏的數組
*/
public ArrayList<String> getSearch() {
SharedPreferences preferDataList = getSharedPreferences(
"SearchDataList", MODE_PRIVATE);
ArrayList<String> list = new ArrayList<>();

int searchNums = preferDataList.getInt("searchNums", 0);
for (int i = 0; i < searchNums; i++) {
searchItem = preferDataList.getString("item_" + i, null);
list.add(searchItem);
}
return list;
}