找不到蓝牙LE设备

Question

I am doing project to detect the BLE device surround you. But however the device can't find any BLE device near by. Device supports BLE, but my coding can't detect the BLE device. Please help me if any mistake or anything missing.

public class MainActivity extends AppCompatActivity {

BluetoothLeScanner leScanner;
ArrayList<ScanFilter> scanFilters;
ScanSettings settings;
ProgressDialog dialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button scanStartbtn= (Button) findViewById(R.id.startscanbtn);
    final BluetoothAdapter adapter=BluetoothAdapter.getDefaultAdapter();

    settings=new ScanSettings.Builder().setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY).build();
    scanFilters=new ArrayList<ScanFilter>();
    scanStartbtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            leScanner=adapter.getBluetoothLeScanner();
            leScanner.startScan(scanFilters,settings,mScanCallback);
            Toast.makeText(MainActivity.this, "Scanning started", Toast.LENGTH_LONG).show();

        }
    });

}



ScanCallback mScanCallback=new ScanCallback() {
    @Override
    public void onScanResult(int callbackType, ScanResult result) {
        super.onScanResult(callbackType, result);
        Toast.makeText(MainActivity.this, "Hey I found BLE device+onScanResult" + result.toString(), Toast.LENGTH_LONG).show();
    }

    @Override
    public void onBatchScanResults(List<ScanResult> results) {
        super.onBatchScanResults(results);
        dialog.dismiss();
        for(ScanResult result:results) {
            Toast.makeText(MainActivity.this, "Hey I found BLE device" + result.toString(), Toast.LENGTH_LONG).show();
        }
    }

    @Override
    public void onScanFailed(int errorCode) {
        super.onScanFailed(errorCode);

        if(errorCode==1) {
            Toast.makeText(MainActivity.this, "Scan is already started" + errorCode, Toast.LENGTH_LONG).show();
        }else if(errorCode==3)
        {
            Toast.makeText(MainActivity.this, "Scan is interrupted due to internal error" + errorCode, Toast.LENGTH_LONG).show();
        }else{
            Toast.makeText(MainActivity.this, "Unexpected error" + errorCode, Toast.LENGTH_LONG).show();
        }
    }
};
}

Thank you.

Answer 1

I think code below is enough :

final BluetoothAdapter adapter=BluetoothAdapter.getDefaultAdapter();
        adapter.startLeScan(new BluetoothAdapter.LeScanCallback() {
            @Override
            public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) {

            }
        })