java - 关闭 BluetoothSocket 的正确方法

Question

我以这种方式创建了 gpsSocket:

final BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
final BluetoothDevice gpsDevice = bluetoothAdapter.getRemoteDevice(bluetoothAddr);
gpsSocket = gpsDevice.createRfcommSocketToServiceRecord(RFCOMM_UUID);
                gpsSocket.connect();

为简单起见，我删除了错误处理。

之后，我设置了一些东西以开始使用套接字:

final InputStream in = gpsSocket.getInputStream();
final BufferedReader reader = new BufferedReader(new InputStreamReader(in, "US-ASCII"));

如果我在从reader读取时捕获到异常，我是否应该关闭reader，或 gpsSocket，还是两者兼而有之？

Answer 1

根据经验，您应该始终注意关闭对象，即 Closeable

两者都是BluetoothSocket和 BufferedReader实现 Closeable 接口(interface)，这意味着一旦您完成了该对象，您应该通过调用 close() 处理它们，否则您将结束内存泄漏。

结构应该是这样的:

BufferedReader reader;

try {
    reader = ... // initialization
} catch (some exception) {
    ...
} finally {
    if (reader != null) {
        reader.close();
    }
}

Should I close reader, gpsSocket or both of them?

您当然应该关闭阅读器。如果您不再需要 gpsSocket，那么您也应该关闭它。但如 documentation of BluetoothSocket.close() 中所示:

If the stream is already closed then invoking this method has no effect.