在Androidmanifest.xml中开启BLUETOOTH_SCAN权限

在AndroidManifest.xml文件中添加蓝牙扫描权限，你需要在`<uses-permission>`标签内声明`<uses-feature>`以及`<permission-sdk>`。以下是具体的步骤：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="your.package.name">

    <uses-permission android:name="android.permission.BLUETOOTH" />
    <!-- Bluetooth LE (Low Energy) scanning requires a higher API level -->
    <uses-feature android:name="android.hardware.bluetooth_le" android:required="true" />

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <!-- For location-based scanning -->

    <!-- If you want to receive advertisements from devices without pairing -->
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

    <!-- Add this permission for Android 6.0 (API level 23) and above -->
    <uses-permission android:name="android.permission.REQUEST_LOCATION_PERMISSION" android:maxSdkVersion="29" />

    <application>
        <!-- ... -->
        <activity>
            <!-- ... -->
            <!-- Here's where you declare your activity requesting the scan permission -->
            <intent-filter>
                <action android:name="android.bluetooth.adapter.action.STATE_CHANGED" />
                <!-- You can also request location permissions if needed -->
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value=".MainActivity" />
        </activity>
    </application>

</manifest>