Android 6.0蓝牙程序无法发现任何可用的蓝牙设备

Question

目标

发现所有可用的蓝牙设备,例如我的iPad蓝牙ON(可发现).

ANDROID VERSION

6

问题

无法发现任何蓝牙设备.

码

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

public BroadcastReceiver mReceiver;
public IntentFilter filter;

private boolean discover_AvailableBluetoothDevice() {
        mReceiver = new BroadcastReceiver() {
            public void onReceive(Context context, Intent intent) {
                Log.d(TAG, "onReceive Called");
                String action = intent.getAction();
                // When discovery finds a device
                if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
                    Log.d(TAG, "ACTION_DISCOVERY_STARTED");
                } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
                    Log.d(TAG, "ACTION_DISCOVERY_FINISHED");
                } else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                    Log.d(TAG, "ACTION_FOUND");
                    // Get the BluetoothDevice object from the Intent
                    BluetoothDevice device = (BluetoothDevice) intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    // Add the name and address to an array adapter to show in a ListView
                    String str = device.getName() + "\n( " + device.getAddress() + " )";
                    adapter.add(str);
                }
            }
        };

        filter = new IntentFilter();
        filter.addAction(BluetoothDevice.ACTION_FOUND);
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        registerReceiver(mReceiver, filter);
        boolean isSuccessDiscovery = mBluetoothAdapter.startDiscovery();
        return isSuccessDiscovery;
    }

执行结果(logcat)

02-02 01:17:26.142 7194-7194/eie.imt.smartswitch D/†MainActivity: This device support Bluetooth.
02-02 01:17:55.052 7194-7194/eie.imt.smartswitch D/†ConnectSwitchActivity: isSuccessDiscovery=true
02-02 01:17:55.147 7194-7194/eie.imt.smartswitch D/†ConnectSwitchActivity: onReceive Called
02-02 01:17:55.147 7194-7194/eie.imt.smartswitch D/†ConnectSwitchActivity: ACTION_DISCOVERY_STARTED
02-02 01:18:07.909 7194-7194/eie.imt.smartswitch D/†ConnectSwitchActivity: onReceive Called
02-02 01:18:07.910 7194-7194/eie.imt.smartswitch D/†ConnectSwitchActivity: ACTION_DISCOVERY_FINISHED

我看到程序没有进入ACTION_FOUND的条件块但我的iPad的蓝牙是ON,问题来自哪里？

Answer 1

如果您使用的是Android 6,请添加以下权限之一:

<uses-permission android:name="android.permission.ACCESS_FINE_LOCTION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

并打开位置服务(GPS):

并启用位置权限:

Google现在需要ACCESS_FINE_LOCTION或ACCESS_COARCE_LOCATION权限才能扫描蓝牙或Wifi设备.这是一种奇怪的行为,但谷歌表示从现在开始应该如何运作.

链接到AndroidDev关于此