Android: Bluetooth 4.0-ble-Summary =1.0

Requirements: BLE connection and communication (do now-device on-search device-connect device)Resources: Some demos and official documents from the Web

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1-ble is a Android4.3 version of the api-to provide some conceptual things or it is necessary to understand
At present, the Android real machine can only accept and control products-that is, the client side of the-server end is only a product-and Apple seems to be a mobile phone can be used as the receiving end can also be sent-
The basic concept is central and peripheral--the handset as the center--the product as the periphery--and both are connected by ble--
So I understand that the--gatt protocol for messaging is based on ATT--they contain a set of information that is server--there can be a lot of characti in the server ... And every feature is the constant information we need.
If there is something wrong with understanding it can be pointed out-after all, my understanding and cognition of this piece is only a few days-

2-Let's go to the formal lecture section below
App permissions Issue = = Call the Bluetooth device to claim permission = =

<span style= "FONT-SIZE:14PX;" ><uses-permission android:name= "Android.permission.BLUETOOTH"/><uses-permission android:name= " Android.permission.BLUETOOTH_ADMIN "/></span>

= = Sometimes the implementation of the various parts of our app is based on Bluetooth then we need to explain that the device is bluetooth only applicable = =

<span style= "FONT-SIZE:14PX;" ><uses-feature        android:name= "Android.hardware.bluetooth_le"        android:required= "true"/></ Span>

3-Building a new project-testbluetooth

Put out Mainactivity.java code.

Package Com.example.testbluetooth;import Java.util.arraylist;import Android.app.activity;import Android.app.listactivity;import Android.bluetooth.bluetoothadapter;import Android.bluetooth.bluetoothadapter.lescancallback;import Android.bluetooth.bluetoothdevice;import Android.bluetooth.bluetoothmanager;import Android.content.context;import Android.content.intent;import Android.content.pm.packagemanager;import Android.os.bundle;import Android.os.handler;import Android.util.Log; Import Android.view.layoutinflater;import android.view.menu;import android.view.menuitem;import Android.view.View; Import Android.view.viewgroup;import Android.widget.baseadapter;import Android.widget.listview;import Android.widget.textview;import Android.widget.toast;public class Mainactivity extends Listactivity {private final static String TAG = "Bluetoohth_test";p rivate ledevicelistadapter mledevicelistadapter;private bluetoothadapter Mbluetoothadapter;private Boolean mscanning;private Handler mhandler;private static Final int request_enable_bt = 1;//Stops scanning after seconds.private static final long scan_period = 10000; @Ov errideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Getactionbar (). Settitle (r.string.title_devices); mhandler = new Handler ();//Determine if BLELOG.I (TAG, "wheter_support_ble") is supported; Getpackagemanager (). Hassystemfeature (Packagemanager.feature_bluetooth_le)) {Toast.maketext (this, R.string.ble_ not_supported, Toast.length_short). Show (); Finish ();} LOG.I (TAG, "Get_about_ble_api"); final Bluetoothmanager Bluetoothmanager = (bluetoothmanager) Getsystemservi        CE (context.bluetooth_service);                Mbluetoothadapter = Bluetoothmanager.getadapter (); if (Mbluetoothadapter = = null) {Toast.maketext (this, r.string.error_bluetooth_not_supported, Toast.length_shor            T). Show ();            Finish ();        Return }} @Overrideprotected void Onresume () {super.onresume ()/////For Bluetooth connection//ensures Bluetooth is EnabLED on the device. If Bluetooth is notlog.i (TAG, "connect_ble"); if (!mbluetoothadapter.isenabled ()) {if (!mbluetoothadapter.isenabled ()) {Intent enablebtintent = new Intent (bluetoothadapter.action_request_enable); Startactivityforresult (Enablebtintent, REQUEST_ENABLE_BT);}} Initializes list view Adapter.mledevicelistadapter = new Ledevicelistadapter (); Setlistadapter (Mledevicelistadapter ); Scanledevice (true);} /** * Real-time search for Bluetooth devices * devices are scanned every once and the device gets a prompt refresh-via Notifydatasetchange method * @author Admin * */private class Ledevicelistadap ter extends Baseadapter {private arraylist<bluetoothdevice> mledevices;private layoutinflater mInflator;public Ledevicelistadapter () {super (); mledevices = new arraylist<bluetoothdevice> (); minflator = MainActivity.this.getLayoutInflater ();} Add a device into the list of public void AddDevice (Bluetoothdevice device) {if (!mledevices.contains (device)) {Mledevices.add (device);}} Gets the corresponding device public bluetoothdevice getdevice (int position) {return mledevices.get (position) in the subkey;} Empty columnsTable Data public void Clear () {mledevices.clear ();} @Overridepublic int GetCount () {return mledevices.size ();} @Overridepublic Object getItem (int i) {return mledevices.get (i);} @Overridepublic long Getitemid (int i) {return i;} @Overridepublic View GetView (int i, view view, ViewGroup viewgroup) {Viewholder viewholder;//general ListView Optimizatio N code.if (view = null) {view = Minflator.inflate (R.layout.listitem_device, null); Viewholder = new Viewholder (); viewhold Er.deviceaddress = (TextView) View.findviewbyid (r.id.device_address); viewholder.devicename = (TextView) View.findviewbyid (R.id.device_name); View.settag (Viewholder);} else {Viewholder = (Viewholder) View.gettag ();} The corresponding devices are processed bluetoothdevice device = Mledevices.get (i); final String devicename = Device.getname (); if (devicename! = null & amp;& devicename.length () > 0) viewHolder.deviceName.setText (devicename); ElseviewHolder.deviceName.setText ( R.string.unknown_device); ViewHolder.deviceAddress.setText (Device.getaddress ()); return view;}}Static class Viewholder {TextView devicename; TextView deviceaddress;} /** * Scan device * @param enable */private void Scanledevice (Final Boolean enable) {if (enable) {//Stops SC            Anning after a pre-defined scan period. Mhandler.postdelayed (New Runnable () {@Override public void run () {MScan                    ning = false;                    Mbluetoothadapter.stoplescan (Mlescancallback);                Invalidateoptionsmenu ();            }}, Scan_period);            Mscanning = true;        Mbluetoothadapter.startlescan (Mlescancallback);            } else {mscanning = false;        Mbluetoothadapter.stoplescan (Mlescancallback); } invalidateoptionsmenu ()///Update the menu bar information}//Scan to the Bluetooth device response settings Private Bluetoothadapter.lescancallback Mlescancallbac K = new Bluetoothadapter.lescancallback () {@Override public void Onlescan (final bluetoothdevice device, int rssi, byte[] Scanrecord) {Runonuithread (new Runnable () {@Override public void run () {                    Mledevicelistadapter.adddevice (device);                Mledevicelistadapter.notifydatasetchanged ();        }            });         }    };        @Override protected void OnPause () {super.onpause ();        Scanledevice (FALSE);    Mledevicelistadapter.clear (); }//the option to scan and pause @Override public boolean oncreateoptionsmenu (Menu menu) {getmenuinflater (). Inflate (r.menu.ma        in, menu);            if (!mscanning) {Menu.finditem (r.id.menu_stop). setvisible (false);            Menu.finditem (R.id.menu_scan). setvisible (True);        Menu.finditem (R.id.menu_refresh). Setactionview (NULL);            } else {Menu.finditem (r.id.menu_stop). setvisible (True);            Menu.finditem (R.id.menu_scan). setvisible (false); Menu.finditem (R.id.menu_refresh). Setactionview (R.layout.actionbar_indeterminate_progress);    } return true;            }//Click event @Override Public boolean onoptionsitemselected (MenuItem item) {switch (Item.getitemid ()) {                Case R.id.menu_scan:mledevicelistadapter.clear ();                Scanledevice (TRUE);            Break                Case R.id.menu_stop:scanledevice (FALSE);        Break    } return true; }/* Listen for events for each subkey * @see Android.app.listactivity#onlistitemclick (Android.widget.ListView, Android.view.Vie W, int, long) */@Override protected void Onlistitemclick (ListView l, View v, int position, long id) {fi        NAL Bluetoothdevice device = mledevicelistadapter.getdevice (position);        if (device = = null) return;        Final Intent Intent = new Intent (this, devicecontrolactivity.class);        Intent.putextra (Devicecontrolactivity.extras_device_name, Device.getname ()); Intent.putextra (Devicecontrolactivity.extras_devIce_address, Device.getaddress ());            if (mscanning) {Mbluetoothadapter.stoplescan (mlescancallback);        Mscanning = false;    } startactivity (Intent);  } @Override protected void Onactivityresult (int requestcode, int resultcode, Intent data) {//User chose        Not to enable Bluetooth.            if (Requestcode = = Request_enable_bt && ResultCode = = activity.result_canceled) {finish ();        Return    } super.onactivityresult (Requestcode, ResultCode, data); }}

3.1-Post---Listitem_device.xml

</pre><pre name= "code" class= "java" ><pre name= "code" class= "HTML" ><?xml version= "1.0" encoding= "Utf-8"? ><linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"              android:orientation = "vertical"              android:layout_width= "match_parent"              android:layout_height= "wrap_content" >    < TextView android:id= "@+id/device_name"            android:layout_width= "match_parent" android:layout_height= "Wrap_            Content "            android:textsize=" 24DP "/>    <textview android:id=" @+id/device_address "            android:layout_ Width= "Match_parent"            android:layout_height= "wrap_content"            android:textsize= "12DP"/></ Linearlayout>

Not to be continued