Let Android Preference display content changes in real-time summary

The preference available in Android can save the user's preference settings. In the Morning Star's Android staff address Book, there is a place to save the user input URL is the use of preference.

However, preference displays the value of summary by default. We want them to show the user input only.

First look at the effect:

If the user is not entered, this summary prompts the user to enter

If the user enters, this displays the user's input value

To implement the above function,

(1) Adding an XML configuration file

< edittextpreference         Android:key = "url"         android:title= "Please enter URL"            >    </ edittextpreference >

(2) Execute Onsharedpreferencechangelistener interface

 Public classSettingsfragmentextendsPreferencefragmentImplementsOnsharedpreferencechangelistener {Privateedittextpreference URL; @Override Public voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);                Addpreferencesfromresource (r.xml.c21preference); URL= (edittextpreference) getpreferencescreen (). findpreference ("url"); } @Override Public voidonsharedpreferencechanged (sharedpreferences sharedpreferences, String key) {/*Get Preference*/                  if(Key.equals ("url") ) {inittextsummary (); }    }             Public voidinittextsummary () {if(Url.gettext (). Equals ("") {url.setsummary ("Please enter the interface address, e.g. http://demo.dotnetcms.org/worklog/"); }        Else{url.setsummary (Url.gettext ()); }} @Override Public voidOnresume () {Super. Onresume ();            Inittextsummary (); Getpreferencemanager (). Getsharedpreferences (). Registeronsharedpreferencechangelistener ( This); } @Override Public voidOnPause () {Getpreferencemanager (). Getsharedpreferences (). Unregisteronsharedpreferencechangelistener ( This); Super. OnPause (); }    

So you can.

(3) Get the user's configuration value

void Read (view view) {            // sharedpreferences settings = getsharedpreferences ("C21preference", Mode_ PRIVATE);          ///// Toast.maketext (Getapplicationcontext (), TXT, toast.length_short). Show ();  Sharedpreferences settings=preferencemanager.getdefaultsharedpreferences (this); String txt=settings.getstring ("url", "xxx"          

Let Android Preference summary display content changes in real time