我正在开发蓝牙应用程序。在我的应用程序中，我有以下代码。当蓝牙关闭时，意味着我的else语句会在打开蓝牙时发现设备列表（它工作正常），否则，如果该语句将运行并获取设备列表。
My problem is "if condition is runnning but it doesn't discover the devices"
。任何人都可以提出解决方案。
if (btAdapter.isEnabled()) {
registerReceiver(ActionFoundReceiver, new IntentFilter(
BluetoothDevice.ACTION_FOUND));
btAdapter.startDiscovery();
} else {
Intent i1 = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivity(i1);
new java.util.Timer().schedule(new java.util.TimerTask() {
@Override
public void run() {
registerReceiver(ActionFoundReceiver, new IntentFilter(
BluetoothDevice.ACTION_FOUND));
btAdapter.startDiscovery();
}
}, 5000);
}
//接收器检测设备代码
private final BroadcastReceiver ActionFoundReceiver = 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);
items += device.getName() + ",";
}
Toast.makeText(getApplicationContext(), items, Toast.LENGTH_LONG)
.show();
}
};
最佳答案
我想这正是您所需要的。
http://developer.android.com/guide/topics/wireless/bluetooth.html#FindingDevices
http://developer.android.com/guide/topics/wireless/bluetooth.html#DiscoveringDevices
关于在不询问用户的情况下启用蓝牙的内容，文档内容如下：
Bluetooth should never be enabled without direct user consent. If you
want to turn on Bluetooth in order to create a wireless connection, you should use the ACTION_REQUEST_ENABLE Intent, which will raise a dialog that requests user permission to turn on Bluetooth. The enable() method is provided only for applications that include a user interface for changing system settings, such as a "power manager" app.
但是，如果您真的想这样做，可以采取以下方法：
BluetoothAdapter.enable（）
您可以调用此电话而无需询问用户
为了使enable（）起作用，您必须在Android Manifest文件中添加权限
“ android.permission.BLUETOOTH_ADMIN”
尝试一下，
getApplicationContext().registerReceiver(receiver,
new IntentFilter(BluetoothDevice.ACTION_ACL_CONNECTED));
getApplicationContext().registerReceiver(receiver,
new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECTED));
关于android - 蓝牙发现无效，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/18401021/