如何更改android中蓝牙适配器的扫描模式。?

如何更改android中蓝牙适配器的扫描模式。?,android,android-intent,bluetooth,discoverability,Android,Android Intent,Bluetooth,Discoverability,目前我正在开发一款蓝牙应用程序,我需要在点击按钮后将扫描模式从Scan\u Mode\u CONNECTABLE\u DISCOVERABLE更改为Scan\u Mode\u CONNECTABLE 我使用以下意图将其设置为可发现: Intent discoverableIntent = new Intent( BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); discoverableIntent .putExtra( BluetoothAdapter

目前我正在开发一款蓝牙应用程序,我需要在点击按钮后将扫描模式从
Scan\u Mode\u CONNECTABLE\u DISCOVERABLE
更改为
Scan\u Mode\u CONNECTABLE

我使用以下意图将其设置为可发现:

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

其中我设置了
不可恢复的\u持续时间=300

现在我想跳过中间的可发现性,只想将其状态更改为
SCAN\u MODE\u CONNECTABLE


请为我提供一个合适的解决方案。

使用扫描模式启动一个新意图\u NONE停止扫描,然后使用扫描模式\u CONNECTABLE重新启动,以便仅在可连接模式下再次扫描。

使用扫描模式\u NONE启动一个新意图,停止扫描,然后使用扫描模式\u CONNECTABLE重新启动,以便在可连接模式下再次扫描仅限。

您不能使用第三方(非内核/非系统)应用程序在4.2及更高版本中设置Android设备的扫描模式。您只能启用查找(
SCAN\u MODE\u CONNECTABLE\u DISCOVERABLE
),并使用
EXTRA\u DISCOVERABLE\u duration
选项设置特定的持续时间。通过设置,可以有效地取消查找

有关证据,请浏览一下,重点是BluetoothAdapter.java

/**
 * Set the Bluetooth scan mode of the local Bluetooth adapter.
 * <p>The Bluetooth scan mode determines if the local adapter is
 * connectable and/or discoverable from remote Bluetooth devices.
 * <p>For privacy reasons, discoverable mode is automatically turned off
 * after <code>duration</code> seconds. For example, 120 seconds should be
 * enough for a remote device to initiate and complete its discovery
 * process.
 * <p>Valid scan mode values are:
 * {@link #SCAN_MODE_NONE},
 * {@link #SCAN_MODE_CONNECTABLE},
 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}.
 * <p>If Bluetooth state is not {@link #STATE_ON}, this API
 * will return false. After turning on Bluetooth,
 * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON}
 * to get the updated value.
 * <p>Requires {@link android.Manifest.permission#WRITE_SECURE_SETTINGS}
 * <p>Applications cannot set the scan mode. They should use
 * <code>startActivityForResult(
 * BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE})
 * </code>instead.
 *
 * @param mode valid scan mode
 * @param duration time in seconds to apply scan mode, only used for
 *                 {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}
 * @return     true if the scan mode was set, false otherwise
 * @hide
 */
public boolean setScanMode(int mode, int duration) {
    if (getState() != STATE_ON) return false;
    try {
        synchronized(mManagerCallback) {
            if (mService != null) return mService.setScanMode(mode, duration);
        }
    } catch (RemoteException e) {Log.e(TAG, "", e);}
    return false;
}

如来源中所述,“应用程序无法设置扫描模式”。手动扫描API之外的模式需要权限。

您不能使用第三方(非内核/非系统)应用程序在4.2及更高版本中设置Android设备的扫描模式。您只能启用查找(
SCAN\u MODE\u CONNECTABLE\u DISCOVERABLE
),并使用
EXTRA\u DISCOVERABLE\u duration
选项设置特定的持续时间。通过设置,可以有效地取消查找

有关证据,请浏览一下,重点是BluetoothAdapter.java

/**
 * Set the Bluetooth scan mode of the local Bluetooth adapter.
 * <p>The Bluetooth scan mode determines if the local adapter is
 * connectable and/or discoverable from remote Bluetooth devices.
 * <p>For privacy reasons, discoverable mode is automatically turned off
 * after <code>duration</code> seconds. For example, 120 seconds should be
 * enough for a remote device to initiate and complete its discovery
 * process.
 * <p>Valid scan mode values are:
 * {@link #SCAN_MODE_NONE},
 * {@link #SCAN_MODE_CONNECTABLE},
 * {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}.
 * <p>If Bluetooth state is not {@link #STATE_ON}, this API
 * will return false. After turning on Bluetooth,
 * wait for {@link #ACTION_STATE_CHANGED} with {@link #STATE_ON}
 * to get the updated value.
 * <p>Requires {@link android.Manifest.permission#WRITE_SECURE_SETTINGS}
 * <p>Applications cannot set the scan mode. They should use
 * <code>startActivityForResult(
 * BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE})
 * </code>instead.
 *
 * @param mode valid scan mode
 * @param duration time in seconds to apply scan mode, only used for
 *                 {@link #SCAN_MODE_CONNECTABLE_DISCOVERABLE}
 * @return     true if the scan mode was set, false otherwise
 * @hide
 */
public boolean setScanMode(int mode, int duration) {
    if (getState() != STATE_ON) return false;
    try {
        synchronized(mManagerCallback) {
            if (mService != null) return mService.setScanMode(mode, duration);
        }
    } catch (RemoteException e) {Log.e(TAG, "", e);}
    return false;
}

如来源中所述,“应用程序无法设置扫描模式”。手动扫描API之外的模式需要许可。

这是一个很老的问题,但是您可以在没有任何用户许可的情况下(就我所测试的情况而言)无限时间地切换蓝牙的扫描模式。 这需要在Android API上使用反射,因此这不是一个官方API。当然,您使用它的风险是您自己承担的:) 下面是我用来使BT适配器可发现的代码:

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;
}
您还需要以下权限:

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


在此设备应处于扫描模式后,通过传递int scanMode参数选择扫描模式。它正在开发Android API 23

这是一个很老的问题,但是你可以在没有任何用户许可的情况下(就我测试而言)无限时间地切换蓝牙扫描模式。 这需要在Android API上使用反射,因此这不是一个官方API。当然,您使用它的风险是您自己承担的:) 下面是我用来使BT适配器可发现的代码:

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;
}
您还需要以下权限:

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


在此设备应处于扫描模式后,通过传递int scanMode参数选择扫描模式。它正在开发Android API 23

@Dennis..感谢您的回复..我只想知道该意图的目标是什么..因为我将设置扫描模式\u无作为其标志之一..它是否与intent discoverableIntent=new intent(BluetoothAdapter.ACTION\u REQUEST\u DISCOVERABLE)相同;我也试着把它当作。。意向意向=新意向(BluetoothAdapter.ACTION\u SCAN\u MODE\u CHANGED);intent.putExtra(BluetoothAdapter.EXTRA\u PREVIOUS\u SCAN\u MODE,BluetoothAdapter.SCAN\u MODE\u CONNECTABLE\u DISCOVERABLE);intent.putExtra(BluetoothAdapter.EXTRA\u扫描模式,BluetoothAdapter.SCAN\u模式\u无);startActivityForResult(意图、扫描模式改变);但是也不起作用。@Dennis..谢谢你的回答..我只想知道该意图的目标是什么..因为我将设置扫描模式\u无作为其标志之一..它与意图发现意图=新意图(BluetoothAdapter.ACTION\u REQUEST\u DISCOVERABLE)相同吗;我也试着把它当作。。意向意向=新意向(BluetoothAdapter.ACTION\u SCAN\u MODE\u CHANGED);intent.putExtra(BluetoothAdapter.EXTRA\u PREVIOUS\u SCAN\u MODE,BluetoothAdapter.SCAN\u MODE\u CONNECTABLE\u DISCOVERABLE);intent.putExtra(BluetoothAdapter.EXTRA\u扫描模式,BluetoothAdapter.SCAN\u模式\u无);startActivityForResult(意图、扫描模式改变);但是也没用问题依然存在。有没有办法做到这一点,还是我们应该关掉蓝牙?问题依然存在。有没有办法做到这一点,还是我们应该关掉蓝牙?