Android 蓝牙 - 检测与设备的断开连接 [英] Android Bluetooth - detect a disconnection from a device

问题描述

我正在尝试捕获蓝牙设备断开连接意图过滤器.我在 onReceive 中添加了一个日志，但它永远不会到达它并且没有显示在 logcat 中.我怀疑问题出在我的 manifest.xml 配置上:

I am trying to catch a bluetooth device disconnection intent filter. I added a log to the onReceive but it never reaches it and is not displayed in the logcat. I suspect that the problem is with my manifest.xml configuration:

清单:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.company"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="16" />

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

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <receiver android:name="com.company.MyReceiver" android:enabled="true" android:exported="true">
            <intent-filter>
                <category android:name="android.intent.category.DEFAULT" />
                <action android:name="android.bluetooth.device.action.ACL_DISCONNECT_REQUESTED" />
                <action android:name="android.bluetooth.adapter.action.CONNECTION_STATE_CHANGED" />
                <action android:name="android.bluetooth.adapter.action.DISCOVERY_STARTED" />
            </intent-filter>
        </receiver>

        <activity
            android:name=".BTActivity"
            android:label="BTActivity" >
        </activity>
    </application>

</manifest>

MyReceiver 扩展了 BroadcastReceiver:

MyReceiver extends BroadcastReceiver:

@Override
    public void onReceive(Context context, Intent intent) {
        Log.i("got-in", "got-in-");
        // String action = intent.getAction();
        BluetoothDevice device = intent
                .getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

        Log.i("disconnect", device.getName());
        Intent i = new Intent(context, BTActivity.class);
        Bundle b = new Bundle();
        b.putString("deviceName", device.getName());
        intent.putExtras(b); // Put your id to your next Intent
        context.startActivity(i);
        // finish();

    }

推荐答案

使用此代码接收断开连接(当蓝牙仍然打开时):

Use this code for receiving a disconnect (when Bluetooth is still turned on):

<intent-filter> <action android:name="android.bluetooth.device.action.ACL_CONNECTED" />
    <action android:name="android.bluetooth.device.action.ACL_DISCONNECT_REQUESTED" />
    <action android:name="android.bluetooth.device.action.ACL_DISCONNECTED" />
</intent-filter>

此外，您还必须注册一个服务，然后注册一个广播接收器以进行蓝牙状态更改，因此您的应用程序知道蓝牙何时关闭并因此丢弃所有活动设备，因为在简单地打开蓝牙时您不会收到 ACL_DISCONNECT关闭.

Also you have to register a service that then registers a broadcast receiver for Bluetooth status change, so your app knows when Bluetooth was turned off and therefore discards all active devices, as you won't receive a ACL_DISCONNECT when Bluetooth is simply turned off.

@Override
    public int onStartCommand(Intent intent, int flags, int startId) {

    IntentFilter filter = new IntentFilter();
    filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
    registerReceiver(bluetoothTurnedOnOff, filter);
    return START_STICKY;
}

private final BroadcastReceiver bluetoothTurnedOnOff = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, -1) == BluetoothAdapter.STATE_OFF) {
 [...]

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