L. Woo L. Woo - 4 months ago 136
Android Question

Bluetooth ACTION_FOUND broadcastReceiver is not working

I'm trying to calculate bluetooth RSSI and found some example, but broadcastReceiver is not working. The code is 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 is clicked, BTAdapter.startDiscovery(); is working.
But nothing changed in textview.

Can you please have some advice for me? Thank you.

Edit Again:
I changed my code little more and I'll show my 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 to Toast
intent.getAction();
but nothing happened.
I think
BluetoothDevice.ACTION_FOUND
is not broadcast.

edit again :
I'm using android 6.0 version.
And my whole manifest is 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 over 6.0 version need additional permission to use
ACTION_FOUND
.
So, I added
ACCESS_FINE_LOCATION
and
ACCESS_COARSE_LOCATION
.
And I added
filter.addAction(BluetoothDevice.ACTION_NAME_CHANGED);
code in my activity.
ACTION_NAME_CHANGED
is worked fine and I can get
BluetoothDevice.EXTRA_NAME
.
But
BluetoothDevice.EXTRA_RSSI,Short.MIN_VALUE
is not working.
It print default value -32768.
Still
BluetoothDevice.ACTION_FOUND
is not working.

Answer

I finally found answer. Android 6.0 needs additional permission, but Just adding uses-permission to Manifest is not working. You have to check permission to user. I write my code like 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 you permission pop up. Thanks for many answers.

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