The use of Android drip Contentobserver

a conceptContentobserver is used to observe (capture) changes in data caused by a particular URI, and then to do some corresponding processing,when the URI observed by the contentobserver changes, it is triggered. The concept of contentobserver is particularly useful for monitoring changes in system data, such as database changes, or any other URI that has been registered in the Urimatcher class. For example: Settings.System.ACCELEROMETER_ROTATION, you can monitor the direction of the system screen. Two-use1. Create

Mobserver = new Contentobserver (new Handler ()) {public                void OnChange (Boolean selfchange) {                UPDATESCREENROTATIONBTN ();                                    }            };

2. Registration

Contentresolver CR = Getcontentresolver ();            Uri tmp = Settings.System.getUriFor (Settings.System.ACCELEROMETER_ROTATION);            Cr.registercontentobserver (TMP, FALSE, Mobserver);