APK and Tutorials for Android Gadgets

Gadget APK

Scan specified BLE devices with ScanFilter

Scan specified BLE devices with ScanFilter
4.7 (93.33%) 3 votes

The former post show how to scan Bluetooth LE device with BluetoothLeScanner, accept all BLE devices. We can use ScanFilter to limit to specified BLE deviecs only.


Edit scanLeDevice() method of MainActivity.java in last post.

package com.blogspot.android_er.androidblegatt;

import android.app.Activity;
import android.app.AlertDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothManager;
import android.bluetooth.le.BluetoothLeScanner;
import android.bluetooth.le.ScanCallback;
import android.bluetooth.le.ScanFilter;
import android.bluetooth.le.ScanResult;
import android.bluetooth.le.ScanSettings;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

private BluetoothAdapter mBluetoothAdapter;
private BluetoothLeScanner mBluetoothLeScanner;

private boolean mScanning;

private static final int RQS_ENABLE_BLUETOOTH = 1;

Button btnScan;
ListView listViewLE;

List<BluetoothDevice> listBluetoothDevice;
ListAdapter adapterLeScanResult;

private Handler mHandler;
private static final long SCAN_PERIOD = 10000;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

// Check if BLE is supported on the device.
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
Toast.makeText(this,
“BLUETOOTH_LE not supported in this device!”,
Toast.LENGTH_SHORT).show();
finish();
}

getBluetoothAdapterAndLeScanner();

// Checks if Bluetooth is supported on the device.
if (mBluetoothAdapter == null) {
Toast.makeText(this,
“bluetoothManager.getAdapter()==null”,
Toast.LENGTH_SHORT).show();
finish();
return;
}

btnScan = (Button)findViewById(R.id.scan);
btnScan.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
scanLeDevice(true);
}
});
listViewLE = (ListView)findViewById(R.id.lelist);

listBluetoothDevice = new ArrayList<>();
adapterLeScanResult = new ArrayAdapter<BluetoothDevice>(
this, android.R.layout.simple_list_item_1, listBluetoothDevice);
listViewLE.setAdapter(adapterLeScanResult);
listViewLE.setOnItemClickListener(scanResultOnItemClickListener);

mHandler = new Handler();

}

AdapterView.OnItemClickListener scanResultOnItemClickListener =
new AdapterView.OnItemClickListener(){

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
final BluetoothDevice device =
(BluetoothDevice) parent.getItemAtPosition(position);

String msg = device.getAddress() + “\n”
+ device.getBluetoothClass().toString() + “\n”
+ getBTDevieType(device);

new AlertDialog.Builder(MainActivity.this)
.setTitle(device.getName())
.setMessage(msg)
.setPositiveButton(“OK”, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {

}
})
.show();

}
};

private String getBTDevieType(BluetoothDevice d){
String type = “”;

switch (d.getType()){
case BluetoothDevice.DEVICE_TYPE_CLASSIC:
type = “DEVICE_TYPE_CLASSIC”;
break;
case BluetoothDevice.DEVICE_TYPE_DUAL:
type = “DEVICE_TYPE_DUAL”;
break;
case BluetoothDevice.DEVICE_TYPE_LE:
type = “DEVICE_TYPE_LE”;
break;
case BluetoothDevice.DEVICE_TYPE_UNKNOWN:
type = “DEVICE_TYPE_UNKNOWN”;
break;
default:
type = “unknown…”;
}

return type;
}

@Override
protected void onResume() {
super.onResume();

if (!mBluetoothAdapter.isEnabled()) {
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, RQS_ENABLE_BLUETOOTH);
}
}
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

if (requestCode == RQS_ENABLE_BLUETOOTH && resultCode == Activity.RESULT_CANCELED) {
finish();
return;
}

getBluetoothAdapterAndLeScanner();

// Checks if Bluetooth is supported on the device.
if (mBluetoothAdapter == null) {
Toast.makeText(this,
“bluetoothManager.getAdapter()==null”,
Toast.LENGTH_SHORT).show();
finish();
return;
}

super.onActivityResult(requestCode, resultCode, data);
}

private void getBluetoothAdapterAndLeScanner(){
// Get BluetoothAdapter and BluetoothLeScanner.
final BluetoothManager bluetoothManager =
(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();
mBluetoothLeScanner = mBluetoothAdapter.getBluetoothLeScanner();

mScanning = false;
}

/*
to call startScan (ScanCallback callback),
Requires BLUETOOTH_ADMIN permission.
Must hold ACCESS_COARSE_LOCATION or ACCESS_FINE_LOCATION permission to get results.
*/
private void scanLeDevice(final boolean enable) {
if (enable) {
listBluetoothDevice.clear();
listViewLE.invalidateViews();

// Stops scanning after a pre-defined scan period.
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
mBluetoothLeScanner.stopScan(scanCallback);
listViewLE.invalidateViews();

Toast.makeText(MainActivity.this,
“Scan timeout”,
Toast.LENGTH_LONG).show();

mScanning = false;
btnScan.setEnabled(true);
}
}, SCAN_PERIOD);

//mBluetoothLeScanner.startScan(scanCallback);

//scan specified devices only with ScanFilter
ScanFilter scanFilter =
new ScanFilter.Builder()
.setServiceUuid(BluetoothLeService.ParcelUuid_GENUINO101_ledService)
.build();
List<ScanFilter> scanFilters = new ArrayList<ScanFilter>();
scanFilters.add(scanFilter);< br />
ScanSettings scanSettings =
new ScanSettings.Builder().build();

mBluetoothLeScanner.startScan(scanFilters, scanSettings, scanCallback);

mScanning = true;
btnScan.setEnabled(false);
} else {
mBluetoothLeScanner.stopScan(scanCallback);
mScanning = false;
btnScan.setEnabled(true);
}
}

private ScanCallback scanCallback = new ScanCallback() {
@Override
public void onScanResult(int callbackType, ScanResult result) {
super.onScanResult(callbackType, result);

addBluetoothDevice(result.getDevice());
}

@Override
public void onBatchScanResults(List<ScanResult> results) {
super.onBatchScanResults(results);
for(ScanResult result : results){
addBluetoothDevice(result.getDevice());
}
}

@Override
public void onScanFailed(int errorCode) {
super.onScanFailed(errorCode);
Toast.makeText(MainActivity.this,
“onScanFailed: ” + String.valueOf(errorCode),
Toast.LENGTH_LONG).show();
}

private void addBluetoothDevice(BluetoothDevice device){
if(!listBluetoothDevice.contains(device)){
listBluetoothDevice.add(device);
listViewLE.invalidateViews();
}
}
};
}


~ Bluetooth LE Gatt Example, step-by-step

Android-er

If the article proved helpful to you, please click on one of the buttons to share it with your friends. Thanks!

Related posts:

Root all devices

Root all devices Android Root methods for all smartphones and tablets, also it include superuser checker tool STEPS: 1. AUTO SEARCH. 2. GET THE AVAILABLE ROOTING METHODS FOR IT 3. ROOT YOUR ANDROID WITH THE STEPS OF ONE OF ROOTING METHODS EASY, SECURE AND [...]

List paired BlueTooth devices, and read its information

List paired BlueTooth devices, and read its information This example check BlueTooth support of the device, then check if it is enabled, and list paired devices in ListView. When user click on any device, display it details. MainActivity.java package com.example.androidbluetooth; import java.util.ArrayList; import java.util.Set; [...]

Goat Simulator APK+DATA v1.0 (1.0) (ALL DEVICES)

Goat Simulator APK+DATA v Goat Simulator Apk and DataKey Features You can be a goat  Get points for wrecking stuff – brag to your friends that you’re the alpha goat  MILLIONS OF BUGS! We’re only eliminating the crash-bugs, everything else is hilarious and we’re [...]

Leave a Reply

Your email address will not be published. Required fields are marked *

*