Question

我想用Android蓝牙API显示已绑定设备的列表，但我不知道为什么在我的设备上运行它时，此代码中没有显示toast？顺便说一下，toast将包含每个设备的名称。

package com.example.fatma.cst;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
import android.widget.Toast;

import java.util.Set;
import java.util.Vector;

public class MainActivity extends AppCompatActivity {
    TextView txt = null;
    private static final int REQUEST_ENABLE_BT = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        final Vector mArrayAdapter = null;
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        BluetoothAdapter bluetoothAdapter=BluetoothAdapter.getDefaultAdapter();

        if(bluetoothAdapter==null){
            Toast t=new Toast(this);
            t.setText("Sorry your phone do not support Bluetooth");
            t.show();
        }
        else
        {
            if (!bluetoothAdapter.isEnabled()) {
                Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
            }

            if(REQUEST_ENABLE_BT!=0) {



    /* bluetoothAdapter.startDiscovery();
                BroadcastReceiver mReceiver = new BroadcastReceiver() {
                    public void onReceive(Context context, Intent intent) {
                        String action = intent.getAction();

                        //Finding devices
                        if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                            // Get the BluetoothDevice object from the Intent
                            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            // Add the name and address to an array adapter to show in a ListView
                            mArrayAdapter.add(device.getName() + "\n" + device.getAddress());



                        }
                    }

                };*/

                //IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
               // registerReceiver(mReceiver, filter);
               Set<BluetoothDevice> devices;

                devices = bluetoothAdapter.getBondedDevices();
                for (BluetoothDevice blueDevice : devices) {
                    Toast.makeText(this, "Device = " + blueDevice.getName(), Toast.LENGTH_SHORT).show();
                }
            }
        }


    }

}

Answer 1

这是我使用的一种方法（并且没有什么特别的）来迭代和记录或配对配对的蓝牙设备。您的代码似乎在做同样的事情。

glorot_uniform

Answer 2

通过在for循环中添加Toast来尝试此代码。

$text_files_path = "C:/inetpub/wwwroot/dbs"; 
$command = ("diff $text_files_path/$OldDbFile $text_files_path/$NewDbFile > $text_files_path/diffFile.txt"); 
exec($command);

您也可以参考此Bluetooth Android Developer

如何查询蓝牙绑定（配对）设备列表？

2 个答案: