java - 如何将值从 MainActivity 传递到 ServiceConnection？

Question

我有一个带有私有(private)字符串属性的MainActivity。在我的代码中，我有以下内容:

private ServiceConnection mTransactionServiceConnection = new ServiceConnection() {
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        mTransactionService = IPoyntTransactionService.Stub.asInterface(iBinder);
        Log.d(TAG, "Transaction service connected");
        try {
            mTransactionService.getTransaction("fcf98959-c188-42d1-b085-786d21e552ac", UUID.randomUUID().toString(), mTransactionServiceListener);
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }

    public void onServiceDisconnected(ComponentName componentName) {
        mTransactionService = null;
        Log.d(TAG, "Transaction service disconnected");
    }
};

值:fcf98959-c188-42d1-b085-786d21e552ac 已硬编码。我需要在 MainActivity 的属性中放置一个字符串。我怎样才能做到这一点？

我尝试将字符串设为公共(public)、静态，但不起作用。

Answer 1

在您的服务中创建一个像 setter 一样工作的函数，例如:

public void setValue(String value){
   this.value = value;
}

在 onServiceConnected() 函数内部

并在初始化服务后从 onServiceConnected() 调用它，您可以使用其中的函数。

private ServiceConnection mTransactionServiceConnection = new ServiceConnection() {
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        mTransactionService = IPoyntTransactionService.Stub.asInterface(iBinder);
        Log.d(TAG, "Transaction service connected");
         **mTransactionService.setValue(the value your want to set);**
        try {
            mTransactionService.getTransaction("fcf98959-c188-42d1-b085-786d21e552ac", UUID.randomUUID().toString(), mTransactionServiceListener);
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }
    public void onServiceDisconnected(ComponentName componentName) {
        mTransactionService = null;
        Log.d(TAG, "Transaction service disconnected");
    }
};

这将更新服务的值。您还可以从 onServiceConnected 外部使用服务函数，只需确保它不为 null。