Question

如何使用另一个线程（非主要）和另一个类中定义的方法？直接示例是在蓝牙教程onAndroidDev中有一个ConnectedThread类并且在该类中有一个write（）方法，用于在bluetooth的输出流上放置一些东西。如何在main activiy中使用该方法，因为我想通过按下按钮发送信息？

private class ConnectedThread extends Thread {
    private final BluetoothSocket mmSocket;
    private final InputStream mmInStream;
    private final OutputStream mmOutStream;

    public ConnectedThread(BluetoothSocket socket) {
        mmSocket = socket;
        InputStream tmpIn = null;
        OutputStream tmpOut = null;

        // Get the input and output streams, using temp objects because
        // member streams are final
        try {
            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();
        } catch (IOException e) { }

        mmInStream = tmpIn;
        mmOutStream = tmpOut;
    }

    public void run() {
        byte[] buffer = new byte[1024];  // buffer store for the stream
        int bytes; // bytes returned from read()

        // Keep listening to the InputStream until an exception occurs
        while (true) {
            try {
                // Read from the InputStream
                bytes = mmInStream.read(buffer);
                // Send the obtained bytes to the UI activity
                mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
                        .sendToTarget();
            } catch (IOException e) {
                break;
            }
        }
    }

    /* Call this from the main activity to send data to the remote device */
    public void write(byte[] bytes) { //how do i use this method in the ui(main) activity?
        try {
            mmOutStream.write(bytes);
        } catch (IOException e) { }
    }

    /* Call this from the main activity to shutdown the connection */
    public void cancel() {
        try {
            mmSocket.close();
        } catch (IOException e) { }
    }
}

Answer 1

确保您尝试从另一个类访问的方法是公共方法。

Answer 2

在此示例中，主要活动调用fragmentActivity并在布局主要活动中显示片段。您需要做的是在 layout fragmentActivity 中创建一个新按钮，并在 onViewCreated 中实例化。按钮在setupChat ()方法中初始化事件后，通过参数发送sendMessage ("yourMessage")您的信息。片段活动中的所有内容。

Answer 3

我建议使用诸如EventBus或Otto之类的eventbus。如果要更改UI，则需要注册该事件，然后在主线程上运行代码，例如Activity.runOnUIThread(){}

从Android中的其他线程调用方法

3 个答案: