Einfache Android BLE Scanner

Question

Ich versuche, eine einfache Android-Anwendung zu erstellen, mit der ich Bluetooth Low Energy (BLE) Geräte scannen und Namen als Log drucken kann. Die Hauptaktivität ist sehr einfach, ich brauche keine Kontrollen, das ist wohl in Ordnung. Der Scan startet, aber ich habe keine Ergebnisse.

Manifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.s1080994.tid.findble"> 


    <uses-permission android:name="android.permission.BLUETOOTH" /> 
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> 


    <uses-feature 
     android:name="android.hardware.bluetooth_le" 
     android:required="true" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
    </application> 

</manifest> 

MainActivity.java

public class MainActivity extends AppCompatActivity { 

    private BluetoothAdapter mBluetoothAdapter = null; 
    private BluetoothLeScanner mBluetoothLeScanner = null; 

    public static final int REQUEST_BT_PERMISSIONS = 0; 
    public static final int REQUEST_BT_ENABLE = 1; 

    private boolean mScanning = false; 
    private Handler mHandler = null; 

    private Button btnScan = null; 

    private ScanCallback mLeScanCallback = 
      new ScanCallback() { 

       @Override 
       public void onScanResult(int callbackType, final ScanResult result) { 
        //super.onScanResult(callbackType, result); 
        Log.i("BLE", result.getDevice().getName()); 

       } 

       @Override 
       public void onScanFailed(int errorCode) { 
        super.onScanFailed(errorCode); 
        Log.i("BLE", "error"); 
       } 
      }; 



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

     btnScan = (Button) findViewById(R.id.btnScan); 

     this.mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); 
     this.mBluetoothLeScanner = mBluetoothAdapter.getBluetoothLeScanner(); 
     this.mHandler = new Handler(); 

     checkBtPermissions(); 
     enableBt(); 
    } 

    public void onBtnScan(View v){ 
     if (mScanning){ 
      mScanning = false; 
      scanLeDevice(false); 
      btnScan.setText("STOP"); 
     } else { 
      mScanning = true; 
      scanLeDevice(true); 
      btnScan.setText("SCAN"); 
     } 
    } 

    public void checkBtPermissions() { 
     this.requestPermissions(
       new String[]{ 
         Manifest.permission.BLUETOOTH, Manifest.permission.BLUETOOTH_ADMIN 
       }, 
       REQUEST_BT_PERMISSIONS); 
    } 

    public void enableBt(){ 
     if (mBluetoothAdapter == null) { 
      // Device does not support Bluetooth 
     } 
     if (!mBluetoothAdapter.isEnabled()) { 
      Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); 
      startActivityForResult(enableBtIntent, REQUEST_BT_ENABLE); 
     } 
    } 

    public void scanLeDevice(final boolean enable) { 
     //ScanSettings mScanSettings = new ScanSettings.Builder().setScanMode(ScanSettings.SCAN_MODE_BALANCED).setCallbackType(ScanSettings.CALLBACK_TYPE_ALL_MATCHES).build(); 

     if (enable) { 
      mScanning = true; 
      Log.i("Scanning", "start"); 
      mBluetoothLeScanner.startScan(mLeScanCallback); 
     } else { 
      Log.i("Scanning", "stop"); 
      mScanning = false; 
      mBluetoothLeScanner.stopScan(mLeScanCallback); 
     } 
    } 
} 

Answer 1

Sie benötigen Standort/GPS-Einstellungen, um zu ermöglichen, BLE-Geräte in der Nähe auf Android zu scannen. Bitte aktivieren Sie location/gps und versuchen Sie zu scannen.