使用BroadcastReceiver监听蓝牙开关状态

var main = plus.android.runtimeMainActivity();  
var BluetoothAdapter = plus.android.importClass("android.bluetooth.BluetoothAdapter");  
var BAdapter = new BluetoothAdapter.getDefaultAdapter();  
var resultDiv = document.getElementById('output');  
var receiver=plus.android.implements('io.dcloud.android.content.BroadcastReceiver', {  
onReceive: function(context, intent) { //实现onReceiver回调函数  
    plus.android.importClass(intent);  
    console.log(intent.getAction());  
    resultDiv.textContent += '\nAction :' + intent.getAction();  
    main.unregisterReceiver(receiver);  
    }  
});  
var IntentFilter = plus.android.importClass('android.content.IntentFilter');  
var filter = new IntentFilter();  
filter.addAction(BAdapter.ACTION_STATE_CHANGED); //监听蓝牙开关  
main.registerReceiver(receiver, filter); //注册监听  

if (!BAdapter.isEnabled()) {  
    BAdapter.enable(); //启动蓝牙  
}else{  
    BAdapter.disable();  
}  

代码已测试过了ctrl+c直接使用

更新：5+已提供蓝牙，参考http://www.html5plus.org/doc/zh_cn/bluetooth.html 注意需要最新版HBuilderX