@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main_tab2015, menu);
    return true;
}

menu 的判斷寫在 Activity 的：

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

如何彈出 menu dialog, 先寫一個 class , class 裡放一個 interface, 然後在 activity 裡去 implements 那一個 interface, 然後就可以變成在 fragment 裡去執行 activity 裡的 function.

sample, 主程式：

https://github.com/haiwen/seadroid/blob/master/app/src/main/java/com/seafile/seadroid2/ui/activity/BrowserActivity.java

副程式：

https://github.com/haiwen/seadroid/blob/master/app/src/main/java/com/seafile/seadroid2/ui/dialog/SortFilesDialogFragment.java

官方網站：http://cocosw.com/BottomSheet/

github: https://github.com/soarcn/BottomSheet

One way to present a set of actions to a user is with bottom sheets, a sheet of paper that slides up from the bottom edge of the screen. Bottom sheets offer flexibility in the display of clear and simple actions that do not need explanation.

我在使用上有遇到一個問題，就是無法在builder 裡 remove menu 的 group, 從外部無法存取到作者官方版本裡 private 的 menu object. 只能透過overwrite 作者的 object 並增加新的 method 才能做到。

更多執行畫面：

String str = "aaa:bbb:ccc:ddd";
String[] tokens = str.split(":");
for (String token:tokens) {
 System.out.println(token);
}

檔案（或是目錄）的非法字元(保留字元) 說明請看：
https://stackoverflow.max-everyday.com/2017/02/filename-rule/

上面這篇的重要是要說，冒號其實是合法字元，而且 Dropbox 支援去同步有冒號的目錄。

參數說明：
https://github.com/nostra13/Android-Universal-Image-Loader/wiki/Useful-Info

universal image loader 似乎內建直接用是 http + get, 要下載自有https 憑證會出問題。解法：
https://github.com/nostra13/Android-Universal-Image-Loader/issues/713

增加header 範例：
android universal image loader not caching or saving image
http://stackoverflow.com/questions/25424103/android-universal-image-loader-not-caching-or-saving-image

Map<String, String> headers = new HashMap<String, String>();
headers.put(“key”, Commons.CURRENT_ACTIVE_PROFILE.getKey());
headers.put(“secret”, Commons.CURRENT_ACTIVE_PROFILE.getSecret());

displayImageOptions = new DisplayImageOptions.Builder()
.extraForDownloader(headers)

使用範例：
https://github.com/haiwen/seadroid/search?utf8=%E2%9C%93&q=AuthImageDownloader

範例2號：
https://github.com/nostra13/Android-Universal-Image-Loader/issues/188

範例3:
http://stackoverflow.com/questions/13586183/accessing-protected-images-in-universal-image-loader/29233984#29233984

PS:
W/ImageLoader: Try to initialize ImageLoader which had already been initialized before. To re-init ImageLoader with new configuration call ImageLoader.destroy() at first.