Android无法检测蓝牙设备

我的广播接收器有问题，正在查找特定设备。在我的程序的前面，我查找当前设备，并允许用户选择。该名称和地址已保存。当应用程序处理其“onResume”时，我创建了一个广播接收器

我所要做的就是查看以前保存的设备是否在该区域中。它不需要配对，但至少必须被看到。我没有看到这些祝酒词。在此之前，我甚至尝试将设备置于可发现模式

这是我的广播接收器

mBluetoothReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        try {
            String action = intent.getAction();

            // When discovery finds a device
            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                // Get the BluetoothDevice object from the Intent
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

                String deviceName = device.getName();
                String deviceAddress = device.getAddress();

                Toast toast = Toast.makeText(getApplicationContext(), "BT Found", Toast.LENGTH_LONG);
                toast.show();

                if (deviceAddress.equals(mDeviceAddress)) {
                    Toast toasty = Toast.makeText(getApplicationContext(), "Correct BT Device Found", Toast.LENGTH_LONG);
                    toasty.show();
                }
            }
            if(BluetoothDevice.ACTION_ACL_CONNECTED.equals(action)) {
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                String deviceName = device.getName();
                String deviceAddress = device.getAddress();
                Toast toast = Toast.makeText(getApplicationContext(), "BT Connected", Toast.LENGTH_LONG);
                toast.show();

                if (deviceAddress.equals(mDeviceAddress)) {
                    Toast toasty = Toast.makeText(getApplicationContext(), "Correct BT Device Connected", Toast.LENGTH_LONG);
                    toasty.show();
                }
            }
            } catch (Exception e) {
                System.out.println("Broadcast Error : " + e.toString());
            }
        }
    };

    IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    this.registerReceiver(mBluetoothReceiver, filter);

    filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    this.registerReceiver(mBluetoothReceiver, filter);

    filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
    this.registerReceiver(mBluetoothReceiver, filter);

    filter = new IntentFilter(BluetoothDevice.ACTION_ACL_CONNECTED);
    this.registerReceiver(mBluetoothReceiver, filter);

    filter = new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECT_REQUESTED);
    this.registerReceiver(mBluetoothReceiver, filter);

    filter = new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECTED);
    this.registerReceiver(mBluetoothReceiver, filter);

编辑

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似乎已正确检测到连接和断开事件。它们仅在更改时检测到。但是，找不到的操作。我不能只是在设备区域。

您设置权限了吗？是的，权限已经设置好了。所以它看起来有些有效。我必须去另一个活动，然后再回到这个活动。此寄存器位于onResume代码中。为什么第一次不起作用，但其他所有的原因都起作用了？