我有我的其中BT建立连接的第一项活动。有psented给用户的选项$ P $，并根据他们的选择，一个不同的活动将加载

I have my first Activity in which the BT connection is established. There is an option presented to the user and, based on their selection, a different Activity will load.

现在的问题是，这两个活动都需要一个BT连接，我没有看到这一点摧毁一个连接只是再拍。

The problem is, both activities need a BT connection and I don't see the point in destroying one connection just to make another.

有没有办法，我可以通过活动之​​间的联系的方式？

Is there a way that I could pass the connection between Activities?

有没有人有一些例子，我或者一个链接？

Does anyone have some example for me or perhaps a link?

我已经试过类MyApplication的扩展应用，但我不能使用：

I've tried "class MyApplication extends Application", but then I can't use:

super.onCreate(savedInstanceState);
setContentView(R.layout.blablabla);

这可能是pretty的愚蠢的问题，但我只在Android的+ - 。2周

This may be a pretty silly question but I've only been at Android +- 2 weeks.

推荐答案

您是否尝试过使用Application对象存储在对象中的蓝牙连接，并使用你的活动得到它？

Have you tried using the Application object to store the Bluetooth connection in an object and using your Activities to get it?

尝试这样的事情。 （注：我从来没有与蓝牙在Android上工作过，所以我不知道该用哪些相关的类在这种情况下，我会使用 BluetoothDevice类，因为它似乎。基于该库文件是正确的类）

Try something like this. (Note: I have never worked with Bluetooth on Android, so I don't know which relevant classes to use. In this case, I'll use BluetoothDevice, since it seems to be the right class based on the library documentation)

public class MyApplication extends Application {
    BluetoothDevice device;
    ...
    public synchronized BluetoothDevice getBtConnection() {
        if (device == null) {
            // construct a BluetoothDevice object and put it into variable device
        }
        return device;
    }
}

这样的话，你的第一个活动只是要做到这一点：

That way, your first activity just has to do this:

public class FirstActivity extends Activity {
    private BluetoothDevice device;
    ...
    @Override
    protected void onCreate(Bundle b) {
        super(b);
        ...
        device = ((MyApplication) getApplication()).getBtDevice();
        ...
    }
    ...
}

然后，任何时候你的其他活动需要用到这方面，他们只需要调用 getBtDevice（），因为 FirstActivity 已实例吧。