Bluetooth operation for Android Development (2)-Modify the visibility of the local Bluetooth device and scan the available Bluetooth devices

1. Modify the visibility of the local Bluetooth device

2. Scan the available Bluetooth devices around

Eg:

I. configuration file adroidmanifest. xml:

<? XML version = "1.0" encoding = "UTF-8"?> <Manifest xmlns: Android = "http://schemas.android.com/apk/res/android" package = "com. se7en "Android: versioncode =" 1 "Android: versionname =" 1.0 "> <uses-SDK Android: minsdkversion =" 8 "/> <application Android: icon = "@ drawable/icon" Android: Label = "@ string/app_name"> <activity Android: Name = ". mainactivity "Android: Label =" @ string/app_name "> <intent-filter> <action Android: Name =" android. intent. action. main "/> <ca Tegory Android: Name = "android. intent. category. launcher "/> </intent-filter> </activity> </Application> <uses-Permission Android: Name =" android. permission. bluetooth "/> <! -To manage a bluetooth device and modify its visibility, you need the following permissions: <uses-Permission Android: Name = "android. Permission. effecth_admin"/> </manifest>

Ii. layout file: Main. xml:

<? XML version = "1.0" encoding = "UTF-8"?> <Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android" Android: Orientation = "vertical" Android: layout_width = "fill_parent" Android: layout_height = "fill_parent"> <textview Android: layout_width = "fill_parent" Android: layout_height = "wrap_content" Android: text = "@ string/Hello"/> <button Android: Id = "@ + ID/discoverbutton" Android: layout_width = "fill_parent" Android: layout_height = "wrap_content" Android: text = "set visibility"/> <button Android: Id = "@ + ID/scanbutton" Android: layout_width = "fill_parent" Android: layout_height = "wrap_content" Android: text = "Start scan"/> </linearlayout>

3. mainactivity:

Import android. app. activity; import android. bluetooth. export thadapter; import android. bluetooth. export thdevice; import android. content. broadcastreceiver; import android. content. context; import android. content. intent; import android. content. intentfilter; import android. OS. bundle; import android. view. view; import android. view. view. onclicklistener; import android. widget. button; public class mainactivity extends activity {private button discoverbutton = NULL; private button scanbutton = NULL; private javasthadapter adapter = NULL; private extends threceiver = NULL; /** called when the activity is first created. * // @ override public void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); adapter = effecthadapter. getdefaadapter adapter (); discoverbutton = (button) findviewbyid (R. id. discoverbutton); scanbutton = (button) findviewbyid (R. id. scanbutton); // modify the visibility of the bluetooth device discoverbutton. setonclicklistener (New onclicklistener () {@ overridepublic void onclick (view) {intent discoverintent = new intent (descrithadapter. action_request_discoverable); // sets the Bluetooth visibility. 500 indicates the visible time (unit: seconds). If the value is greater than 300, the default value is 300discoverintent. putextra (effecthadapter. extra_discoverable_duration, 500); startactivity (discoverintent) ;}}); scanbutton. setonclicklistener (New onclicklistener () {@ overridepublic void onclick (view v) {// start to scan the peripheral bluetooth device. This method is called asynchronously and returned as a broadcast mechanism, therefore, you need to create a broadcastreceiver to obtain the information adapter. startdisdevice () ;}}); // sets the filter intentfilter = new intentfilter (descrithdevice. action_found); // create a receiver for Bluetooth broadcast information (); // register a broadcast receiver (registerreceiver, intentfilter );} private class extends threceiver extends broadcastreceiver {@ overridepublic void onreceive (context, intent) {// obtain the scanned remote Bluetooth device. Then thdevice device = intent. getparcelableextra (effecthdevice. extra_device); system. out. println (device. getaddress ());}}}