ScanSettings. Builder settingBuilder=new ScanSettings. Builder (); 
SettingBuilder. SetScanMode (ScanSettings. SCAN_MODE_LOW_LATENCY); 
SettingBuilder. SetMatchMode (ScanSettings. MATCH_MODE_AGGRESSIVE); 
SettingBuilder. SetCallbackType (ScanSettings. CALLBACK_TYPE_ALL_MATCHES); 
SettingBuilder. SetLegacy (true);//false10 seconds a true about 20 s a 
ScanSettings Settings=settingBuilder. The build (); 

Excuse me breath screen mode scanning interval can be modified, now the fastest also need to 10 seconds to scan, there are ways to modify the scanning interval scanning rates screen can a bit faster?