importPackage(android.bluetooth);
importPackage(android.content);
importClass(java.util.concurrent.CountDownLatch);
importClass(java.util.concurrent.TimeUnit);

function enableBt() {
    var a = BluetoothAdapter.getDefaultAdapter();
    if (a == null) throw new Error("不支持蓝牙");
    a.enable();
    return a;
}

function withPan(adapter, fn) {
    var latch = new CountDownLatch(1);
    var out = { v: false };

    adapter.getProfileProxy(context, new BluetoothProfile.ServiceListener({
        onServiceConnected: function(p, proxy) {
            if (p == BluetoothProfile.PAN) {
                out.v = fn(proxy);
                adapter.closeProfileProxy(BluetoothProfile.PAN, proxy);
            }
            latch.countDown();
        },
        onServiceDisconnected: function() {
            latch.countDown();
        }
    }), BluetoothProfile.PAN);

    latch.await(2, TimeUnit.SECONDS);
    return out.v;
}

function toggleBluetoothTethering(context) {
    var adapter = enableBt();
    var state = withPan(adapter, function(p) { return p.isTetheringOn(); });
    withPan(adapter, function(p) { p.setBluetoothTethering(!state); });
    return state ? "蓝牙网络共享已关闭" : "蓝牙网络共享已开启";
}

toggleBluetoothTethering(context);
// 通过蓝牙共享手机的网络连接