Android上的蓝牙:调试startDiscovery() [英] Bluetooth on Android: Debuging startDiscovery()

问题描述

我正在开发一个搜索可发现设备并将其显示为按钮的应用程序. 调用startDiscovery()时，根据我当前使用BroadcastReceiver和ACTION_DISCOVERY_FINISHED调试的方式，我会说它工作30％的时间.

I'm working on an app that searches for discoverable devices and displays them as buttons. When calling startDiscovery() I would say it works 30% of the time, based on the way I'm currently debugging it, with the BroadcastReceiver and ACTION_DISCOVERY_FINISHED.

我也在使用isDiscovering()来测试startDiscovery()函数是否被调用，但是它返回false.

I'm also using isDiscovering() to test if the startDiscovery() function is called but it returns false.

有没有办法知道是否成功调用了startDiscovery()?并且您可以在我的代码中识别出不会失败的东西吗?

Is there a way to know if startDiscovery() is called successfully? And can you identify something in my code that would make it not fail?

不好.:我同时具有BLUETOOTH和BLUETOOTH_ADMIN权限.

Obs.: I have both BLUETOOTH AND BLUETOOTH_ADMIN permissions.

这是我的代码:

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scan);

        mReceiver = new BroadcastReceiver() {
            public void onReceive(Context context, Intent intent) {
                String action = intent.getAction();
                String Address;
                // 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);
                    Address = device.getAddress();
                    System.out.println("Found Address: " + Address );  //DEBUG
                            //Do something with Address
                } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
                    System.out.println("Discovery finished");
                }
            }
        };

        // Register the BroadcastReceiver
        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        registerReceiver(mReceiver, filter);    

        MainActivity.mBluetoothAdapter.startDiscovery();

        if (MainActivity.mBluetoothAdapter.isDiscovering()) {
            System.out.println("Discovering...");  //DEBUG
        }

}

尽管我有一些可发现的设备，但没有一个会用ACTION_FOUND触发onReceive()

Although I have a few discoverable devices available, none of them trigger onReceive() with ACTION_FOUND

更新:运行该应用程序时，我转到了蓝牙设置"下的扫描"，并且无法扫描新设备.我禁用/启用了蓝牙并返回到应用程序，问题已解决.我不知道这是否表明适配器正忙或暂停.

UPDATE: I went to "Scan" under Bluetooth Settings while the app was running and I could not scan for new devices. I disabled/enabled Bluetooth and returned to the app and the problem was resolved. I don't know if that indicates that the adapter is busy or halted somehow.

推荐答案

我确认了这个问题.

在某些电话上，您只需要禁用/激活BT.您可以通过编程方式进行操作

On some telephones you just need to disable/active BT. You can doit programatically with

mBluetoothAdapter.disable(); 
mBluetoothAdapter.enable();

在某些电话上，这还不够(三星S5).为了检测它，我使用计时器，并且在超时结束时未收到BT广播状态的更改(BluetoothAdapter.ACTION_DISCOVERY_STARTED或BluetoothAdapter.ACTION_DISCOVERY_FINISHED)=>表示BT无法正常工作的迹象.实际上，我显示了一个对话框，建议用户重新启动电话.

On some telephones its not enough ( Samsung S5 ). To detect it, I use timer, and if on end of timeout the change of BT broadcast state (BluetoothAdapter.ACTION_DISCOVERY_STARTED or BluetoothAdapter.ACTION_DISCOVERY_FINISHED ) wasnt received => its sign that BT is not working. Actually I show dialog which propose to user reboot the telephone.

这篇关于Android上的蓝牙:调试startDiscovery()的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！