安卓藍牙掃描周期性廣告

Question

我是 Android 開發和藍牙的新手，所以如果我的問題聽起來很愚蠢，請原諒我，我正在使用他們的 nrf connect sdk 2.0.0 示例藍牙定期廣告在 Nordic 52840 上工作，我想掃描我的北歐設備並接收廣告數據使用 android 手機 Android 10.0，我可以使用我的代碼找到其他設備，例如一些筆記本電腦、三星電視等，但找不到我需要的北歐設備。

package com.example.ble_scanner;

import androidx.appcompat.app.AppCompatActivity;

import android.Manifest;
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.ScanResult;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.nfc.Tag;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;


public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MyActivity";
    private BluetoothAdapter mBluetoothAdapter  = null;
    private BluetoothLeScanner mBluetoothLeScanner = null;
    public ArrayList<BluetoothDevice> mBTdevice=new ArrayList<>();
    public DeviceListAdapter mDeviceListAdapter;
    ListView lvNewDevice;
    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 final BroadcastReceiver mBroadcastreceiver1=new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action =intent.getAction();
        if(action.equals(mBluetoothAdapter.ACTION_STATE_CHANGED)){
            final int state=intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,mBluetoothAdapter.ERROR);

            switch (state){
                case BluetoothAdapter.STATE_OFF:
                    Log.d(TAG,"STATE OFF");
                    break;
                case BluetoothAdapter.STATE_TURNING_OFF:
                    Log.d(TAG,"TURNNING OFF");
                    break;
                case BluetoothAdapter.STATE_ON:
                    Log.d(TAG,"STATE ON");
                    break;
                case BluetoothAdapter.STATE_TURNING_ON:
                    Log.d(TAG,"TURNNING ON");
                    break;
            }
        }
    }
};
private final BroadcastReceiver mBroadcastreceiver2=new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action =intent.getAction();
        if(action.equals(mBluetoothAdapter.ACTION_SCAN_MODE_CHANGED)){
            final int state=intent.getIntExtra(BluetoothAdapter.EXTRA_SCAN_MODE,mBluetoothAdapter.ERROR);

            switch (state){
                case BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE:
                    Log.d(TAG,"DISCOVERABLE");
                    break;
                case BluetoothAdapter.SCAN_MODE_CONNECTABLE:
                    Log.d(TAG,"Discoverability Disable,Able to receive connection");
                    break;
                case BluetoothAdapter.SCAN_MODE_NONE:
                    Log.d(TAG,"Discoverability Disable,unable to receive connection");
                    break;
                case BluetoothAdapter.STATE_CONNECTING:
                    Log.d(TAG,"Connecting...");
                    break;
                case BluetoothAdapter.STATE_CONNECTED:
                    Log.d(TAG,"Connected");
                    break;
            }
        }
    }
};
private final BroadcastReceiver mBroadcastreceiver3=new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action =intent.getAction();
        Log.d(TAG,"onReceive:ACTION FOUND");
        if(action.equals(BluetoothDevice.ACTION_FOUND)){
            BluetoothDevice device=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            mBTdevice.add(device);
            Log.d(TAG,"onReceive: "+device.getName()+" : "+device.getAddress());
            mDeviceListAdapter=new DeviceListAdapter(context,R.layout.device_adapter_view,mBTdevice);
            lvNewDevice.setAdapter(mDeviceListAdapter);

        }
    }
};

@Override
protected void onDestroy() {
    Log.d(TAG,"onDestroy called");
    super.onDestroy();
    unregisterReceiver(mBroadcastreceiver1);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    lvNewDevice=(ListView)findViewById(R.id.lvNewDevice);
    mBTdevice=new ArrayList<>();
    mBluetoothAdapter= BluetoothAdapter.getDefaultAdapter();

    Button Btbtn=(Button) findViewById(R.id.button);
    Btbtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.d(TAG,"enable disable button");
            enabledisableBT();
        }
    });
    Button discover=(Button)findViewById(R.id.button3);
    discover.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            discoverenabledisable();
        }
    });
    Button scan=(Button)findViewById(R.id.button4);
    scan.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            scanBTDevice();
        }
    });

}


public void enabledisableBT(){
    if(mBluetoothAdapter==null){
        Log.d(TAG,"Does not have BT function");
    }
    if(!mBluetoothAdapter.isEnabled()){
        Intent enableBTIntent =new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivity(enableBTIntent);

        IntentFilter BTIntent=new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
        registerReceiver(mBroadcastreceiver1,BTIntent);
    }
    if(mBluetoothAdapter.isEnabled()){
        mBluetoothAdapter.disable();

        IntentFilter BTIntent=new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
        registerReceiver(mBroadcastreceiver1,BTIntent);
    }
}
public void discoverenabledisable(){
    Log.d(TAG,"make device discoverable for 300 second");

    Intent discoverableIntent= new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
    discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION,300);
    startActivity(discoverableIntent);
    IntentFilter intentFilter=new IntentFilter(mBluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
    registerReceiver(mBroadcastreceiver2,intentFilter);
}
public void scanBTDevice(){
    Log.d(TAG,"Scan device");

    if(mBluetoothAdapter.isDiscovering()){
        mBluetoothAdapter.cancelDiscovery();
        Log.d(TAG,"cancel scan");
        checkBTPermission();
        mBluetoothAdapter.startDiscovery();
        IntentFilter discoveryDeviceIntent =new IntentFilter(BluetoothDevice.ACTION_FOUND);
        registerReceiver(mBroadcastreceiver3,discoveryDeviceIntent);
    }
    if(!mBluetoothAdapter.isDiscovering()){
        checkBTPermission();
        mBluetoothAdapter.startDiscovery();
        IntentFilter discoveryDeviceIntent =new IntentFilter(BluetoothDevice.ACTION_FOUND);
        registerReceiver(mBroadcastreceiver3,discoveryDeviceIntent);
    }
}
private void checkBTPermission(){
    if(Build.VERSION.SDK_INT>Build.VERSION_CODES.LOLLIPOP){
        int pc=this.checkSelfPermission("Manifest.permission.ACCESS_FINE_LOCATION");
        pc+=this.checkSelfPermission("Manifest.permission.ACCESS_COARSE_LOCATION");
        if(pc!=0){
            this.requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.ACCESS_COARSE_LOCATION},1001);
        }else {
            Log.d(TAG,"checkBT permission");
        }
    }
}

我的應用找到了一些藍牙設備，但不是我需要的

Answer 1

您的代碼當前正在搜索經典藍牙設備，但您的​​ nRF52840 正在使用藍牙低功耗 (BLE)。 這些都是藍牙標准的一部分，但不兼容。 請閱讀BLE 概述以及 Android 開發者文檔的查找 BLE 設備頁面。

對於許多開發人員來說，BLE 可能很難處理，並且有很多在線指南可以幫助您比 Android 文檔更進一步。 我個人使用 Martijn van Welie 的制作 Android BLE 工作指南取得了成功。