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java - 我正在做一个项目，它不断地给我以前配对的设备的 RSSI。我没有得到连续的结果

问题描述

该项目应该不断地给我一个已知 MAC 地址的设备的 RSSI。我得到了大约 2-3 次 RSSI，然后什么也没有。即使我在安卓手机上测试这个设备，我也可以绕过谷歌向我抛出的电池限制等。该项目的目标设备将是一个根植的 Android M 设备。

这是我的代码：

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

            if(BluetoothDevice.ACTION_FOUND.equals(action)){
                BluetoothDevice device=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                String deviceName=device.getName();
                String deviceHardwareAddress=device.getAddress();
                int rssi=intent.getShortExtra(BluetoothDevice.EXTRA_RSSI,Short.MIN_VALUE);
                if(deviceHardwareAddress.equals(MAC)){
                    deviceFound=true;
                    bluetoothAdapter.cancelDiscovery();
                    Log.i("broadcastReceiver" , "device " + deviceName);
                    Log.i("broadcastReceiver" , "hard"  + deviceHardwareAddress);
                    Log.i("broadcastReceiver","Rssi "+rssi);
                    Log.i("broadcastReceiver","Paired Id "+MAC );
                    tv.setText(deviceName+"     "+rssi);
                    stringArrayList.add(String.valueOf(rssi));
                    arrayAdapter.notifyDataSetChanged();
                    deviceFound=false;
                    bluetoothAdapter.startDiscovery();
                }
                if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){
                    if(deviceFound==false){
                        bluetoothAdapter.startDiscovery();
                    }
                }
            }

        }
    };

标签： javaandroidbluetooth

解决方案

解决了！

只需将 BroadcastReceiver 分成两部分即可。请不要在不了解会发生什么的情况下复制此答案。此代码将消耗大量电池。我的项目允许这样做。它会有类似连续电源的东西。它只在某些条件下运行。干杯!

  private final BroadcastReceiver broadcastReceiver1=new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action=intent.getAction();
            if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){
                if(deviceFound==false) {
                    bluetoothAdapter.cancelDiscovery();
                    bluetoothAdapter.startDiscovery();
                }
            };
        }
    };
private final BroadcastReceiver broadcastReceiver=new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action=intent.getAction();

            if(BluetoothDevice.ACTION_FOUND.equals(action)){
                BluetoothDevice device=intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                String deviceName=device.getName();
                String deviceHardwareAddress=device.getAddress();
                int rssi=intent.getShortExtra(BluetoothDevice.EXTRA_RSSI,Short.MIN_VALUE);
                if(deviceHardwareAddress.equals(MAC)){
                    deviceFound=true;
                    bluetoothAdapter.cancelDiscovery();
                    Log.i("broadcastReceiver" , "device " + deviceName);
                    Log.i("broadcastReceiver" , "hard"  + deviceHardwareAddress);
                    Log.i("broadcastReceiver","Rssi "+rssi);
                    Log.i("broadcastReceiver","Paired Id "+MAC );
                    tv.setText(deviceName+"     "+rssi);
                    deviceFound=false;
                    bluetoothAdapter.startDiscovery();
                }
            }

        }
    };

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