如何在Android中更改蓝牙适配器的扫描模式? [英] How to Change the Scan Mode of Bluetooth Adapter in android.?

问题描述

当前，我正在使用蓝牙应用程序，需要单击按钮将扫描模式从 SCAN_MODE_CONNECTABLE_DISCOVERABLE 更改为 SCAN_MODE_CONNECTABLE .

Currently i am working on a Bluetooth app where i need to change the Scan Mode from SCAN_MODE_CONNECTABLE_DISCOVERABLE to SCAN_MODE_CONNECTABLE on click of a button.

我使用以下意图将其设置为可发现":

i am setting it Discoverable using following Intent:

Intent discoverableIntent = new Intent( BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); discoverableIntent .putExtra( BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, DISOVERABLE_DURATION);
startActivityForResult(discoverableIntent, REQUEST_DISCOVERABLE_BT);

---

我在其中设置了 DISOVERABLE_DURATION = 300 ;

现在，我想跳过两者之间的可发现性，只想将其状态更改为 SCAN_MODE_CONNECTABLE .

Now i want to skip the Discoverability in between and want to change its state to SCAN_MODE_CONNECTABLE only.

请为我提供适当的解决方案../

Kindly provide me an appropriate solution../

推荐答案

这是一个很老的问题，但是您可以在没有用户任何许可的情况下(并且就我所测试的而言)无限制地切换蓝牙的扫描模式.这将需要在Android API上使用反射，因此这不是官方的API.当然，您自己承担风险使用:)下面是我用来使BT适配器可发现的代码:

Well it is quite old question, however you can switch scan mode of bluetooth without any permission of user and (for as far as i have tested) unlimited time. This will require using reflections on Android API, so this is not an official api. Of course, you are using it on your own risk :) Below is code i am using to make BT adapter discoverable:

private boolean setBluetoothScanMode(int scanMode){
    Method method = null;
    final BluetoothAdapter btAdapter = btManager.getAdapter();

    if(!btAdapter.isEnabled()){
        Log.d(LCAT, "BT adapter is off, turning on");
        btAdapter.enable();
    }

    try {
        method = btAdapter.getClass().getMethod("setScanMode", int.class);
    } catch (SecurityException e) {
        return false;
    } catch (NoSuchMethodException e) {
        return false;
    }

    try {
      method.invoke(btAdapter, scanMode);
    } catch (IllegalArgumentException e) {
        return false;
    } catch (IllegalAccessException e) {
        return false;
    } catch (InvocationTargetException e) {
        return false;
    }
    return true;
}

您还需要权限:

<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />

此设备应处于扫描模式后，您可以通过传递int scanMode参数进行选择.它可以在Android API 23上运行.

After this device should be in scan mode you choose by passing the int scanMode argument. It is working on Android API 23.

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