Android Bluetooth使用詳解

1.判斷是否支持Bluetooth
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(bluetoothAdapter == null) {
    //the device doesn't support bluetooth
} else {
    //the device support bluetooth
}

2.如果支持，打開Bluetooth

if(!bluetoothAdapter.isEnable()) {
    Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(enableIntent,REQUEST_ENABLE_BT);
}

3.監視Bluetooth打開狀態

BroadcastReceiver bluetoothState = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
    String stateExtra = BluetoothAdapter.EXTRA_STATE;
       int state = intent.getIntExtra(stateExtra, -1);
       switch(state) {
    case BluetoothAdapter.STATE_TURNING_ON:
        break;
    case BluetoothAdapter.STATE_ON:
        break;
    case BluetoothAdapter.STATE_TURNING_OFF:
        break;
    case BluetoothAdapter.STATE_OFF:
        break;
    }
    }
}

registerReceiver(bluetoothState,new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));

4.設置本地設備可以被其它設備搜索
Intent discoveryIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
startActivityForResult(discoveryIntent,REQUEST_DISCOVERY);

BroadcastReceiver discovery = new BroadcastReceiver() {
    @Override
    public void onRecevie(Content context, Intent intent) {
        String scanMode = BluetoothAdapter.EXTRA_SCAN_MODE;
        String preScanMode = BluetoothAdapter.EXTRA_PREVIOUS_SCAN_MODE;
        int mode = intent.getIntExtra(scanMode);
    }
}

registerReceiver(discovery,new IntentFilter(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED);

5.搜索設備
開始搜索 bluetoothAdapter.startDiscovery();
停止搜索 bluetoothAdapter.cancelDiscovery();

當發現一個設備時，系統會發出ACTION_FOUND廣播消息，我們可以實現接收這個消息的BroadcastReceiver

BroadcastReceiver deviceFound = new BroadcastReceiver() {
    @Override
    public void onReceiver(Content content, Intent intent) {
        String remoteDeviceName = intent.getStringExtra(BluetoothAdapter.EXTRA_NAME);
        BluetoothDevice remoteDevice = intent.getParcelableExtra(BluetoothAdapter.EXTRA_DEVICE);
    }
}

registerReceiver(deviceFound, new IntentFilter(BluetoothAdapter.ACTION_FOUND);