Question

首先，我是android编程的新手现在我的问题是我想创建一个列出附近可用蓝牙设备的应用程序，我阅读了android概述，并尝试遵循它，但是我的代码不起作用，可能是问题所在

我已经阅读了一些文章，但无法正常工作

package com.example.arduinobluetoothinterface;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Set;

public class Main2Activity extends AppCompatActivity {
    //set an ArrayList for the bluetooth Devices Names
    ArrayList<BtDevicesClass> listOfDevices = new ArrayList<>();
    final BluetoothAdapter BluetoothDevices = BluetoothAdapter.getDefaultAdapter();
    // Create a BroadcastReceiver for ACTION_FOUND.
    private final BroadcastReceiver receiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                // Discovery has found a device. Get the BluetoothDevice
                // object and its info from the Intent.
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                String deviceName = device.getName();
                String deviceHardwareAddress = device.getAddress(); // MAC address
                listOfDevices.add(new BtDevicesClass(deviceHardwareAddress,deviceName));
            }
        }
    };
    @Override
    protected void onDestroy() {
        super.onDestroy();
        // Don't forget to unregister the ACTION_FOUND receiver.
        unregisterReceiver(receiver);
        BluetoothDevices.disable();

    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        registerReceiver(receiver, filter);
        setContentView(R.layout.activity_main2);
        //set the bluetooth adapter
        //set a List view for the bluetooth Devices
        ListView listofItems = (ListView) findViewById(R.id.root_view);
        //set Adapter
        ArrayAdapterBt itemAdapter = new ArrayAdapterBt(this, listOfDevices);
        //append list item to ArrayAdapter
        listofItems.setAdapter(itemAdapter);
        //check if the bluetooth service is avaliable on the device
        if (BluetoothDevices != null) { //check if the device supports bluetooth
            /*
             ** if the bluetooth module is not enabled this block of code pops-up a message to
             * enable it via an Intent , this is done by performing an Intent as shown below
             */
           if (!BluetoothDevices.isEnabled()) {
                Intent bluetoothenableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                startActivityForResult(bluetoothenableIntent, 0);
            }
                Toast.makeText(getApplicationContext(),"Searching for nearby Devices",Toast.LENGTH_SHORT).show();
                Intent makeDeviceDiscouvrable = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
                startActivityForResult(makeDeviceDiscouvrable,0);
                BluetoothDevices.startDiscovery();
                Set<BluetoothDevice> pairedDevices = BluetoothDevices.getBondedDevices();
                if (pairedDevices.size() > 0) {
                    // There are paired devices. Get the name and address of each paired device.
                    for (BluetoothDevice device : pairedDevices) {
                        String deviceName = device.getName();
                        String deviceHardwareAddress = device.getAddress(); // MAC address
                        listOfDevices.add(new BtDevicesClass(deviceHardwareAddress,deviceName));
                    }
                }

        }
    }
}

Answer 1

尝试以下代码：

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();

List<String> bluetoothList = new ArrayList<String>();
for(BluetoothDevice bluetooth : pairedDevices)
    bluetoothList.add(bluetooth.getName());

setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item, bluetoothList));

可用的蓝牙设备列表

1 个答案: