android - Bluetooth ACTION_FOUND broadcastReceiver is not working -

i'm trying calculate bluetooth rssi , found example, broadcastreceiver not working. code this:

private final broadcastreceiver receiver = new broadcastreceiver(){      @override     public void onreceive(context context, intent intent) {          string action = intent.getaction();         if(bluetoothdevice.action_found.equals(action)) {             int rssi = intent.getshortextra(bluetoothdevice.extra_rssi,short.min_value);             string name = intent.getstringextra(bluetoothdevice.extra_name);             textview rssi_msg = (textview) findviewbyid(r.id.textview1);             rssi_msg.settext(rssi_msg.gettext() + name + " => " + rssi + "dbm\n");         }     } }; 

registered through this:

registerreceiver(receiver, new intentfilter(bluetoothdevice.action_found)); 

and when button clicked, btadapter.startdiscovery(); working. nothing changed in textview.

can please have advice me?

edit again: changed code little more , i'll show whole code.

public class blutooth extends activity {  private bluetoothadapter btadapter = bluetoothadapter.getdefaultadapter();  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_blutooth);      button boton = (button) findviewbyid(r.id.button1);     boton.setonclicklistener(new onclicklistener(){         public void onclick(view v) {             btadapter.startdiscovery();         }     }); }  @override public boolean oncreateoptionsmenu(menu menu) {     getmenuinflater().inflate(r.menu.blutooth, menu);     return true;   } } 

and receiver class is

public class testreceiver extends broadcastreceiver {  @override public void onreceive(context context, intent intent) {     // todo auto-generated method stub     string name = intent.getaction();     string device = intent.getstringextra(bluetoothdevice.extra_name);     string rssi_msg = integer.tostring(intent.getshortextra(bluetoothdevice.extra_rssi,short.min_value));     toast.maketext(context, name, toast.length_short).show();   }  } 

i'm trying toast intent.getaction(); nothing happened. think bluetoothdevice.action_found not broadcast.

edit again : i'm using android 6.0 version. , whole manifest this:

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.example.blutooth"     android:versioncode="1"     android:versionname="1.0" >      <uses-feature android:name="android.hardware.bluetooth" />     <uses-permission android:name="android.permission.bluetooth" />     <uses-permission android:name="android.permission.bluetooth_admin" />     <uses-permission android:name="android.permission.access_fine_location" />     <uses-permission android:name="android.permission.access_coarse_location" />     <uses-sdk         android:minsdkversion="23"         android:targetsdkversion="23" />      <application         android:allowbackup="true"         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         android:theme="@style/apptheme" >         <activity             android:name=".blutooth"             android:label="@string/app_name" >             <intent-filter>                 <action android:name="android.intent.action.main" />                  <category android:name="android.intent.category.launcher" />             </intent-filter>         </activity>         <receiver android:name=".testreceiver">             <intent-filter>                 <action android:name="bluetoothdevice.action_found">             </action></intent-filter>         </receiver>      </application>  </manifest> 

i heard on 6.0 version need additional permission use action_found. so, added access_fine_location , access_coarse_location. , added filter.addaction(bluetoothdevice.action_name_changed); code in activity. action_name_changed worked fine , can bluetoothdevice.extra_name. bluetoothdevice.extra_rssi,short.min_value not working. print default value -32768. still bluetoothdevice.action_found not working.

i found answer. android 6.0 needs additional permission, adding uses-permission manifest not working. have check permission user. write code this:

int permissioncheck = contextcompat.checkselfpermission(thisactivity, manifest.permission.access_coarse_location);          bluetoothadapter bluetoothadapter = bluetoothadapter.getdefaultadapter();         if (!bluetoothadapter.isenabled())           bluetoothadapter.enable();         lescanner = bluetoothadapter.getbluetoothlescanner();          button boton = (button) findviewbyid(r.id.button1);         boton.setonclicklistener(new onclicklistener(){             public void onclick(view v) {                 lescanner.startscan(scancallback);             }         }); 

this code show permission pop up. many answers.