Question

如果没有正在运行的活动，如何从线程发出Toast消息？

我启动了应用程序，为后台套接字侦听创建了一个新线程，然后退出了应用程序。但是，该线程然后仍监听传入的套接字请求。

我从这个例子开始：BluetoothChat 在这个地方的某个地方（BluetoothChatService.java行：来自类＆＃34的243;私有类AcceptThread扩展Thread＆＃34;）我开始吐司：

public void run() {
        if (D) Log.d(TAG, "BEGIN mAcceptThread" + this);
        setName("AcceptThread");
        BluetoothSocket socket = null;

        // Listen to the server socket if we're not connected
        while (mState != STATE_CONNECTED) {
            try {
                // This is a blocking call and will only return on a
                // successful connection or an exception
                socket = mmServerSocket.accept();
            } catch (IOException e) {
                Log.e(TAG, "accept() failed", e);
                break;
            }

            // If a connection was accepted
            if (socket != null) {
                synchronized (BluetoothChatService.this) {
                    switch (mState) {
                    case STATE_LISTEN:
                    case STATE_CONNECTING:
                        // Situation normal. Start the connected thread.
                        connected(socket, socket.getRemoteDevice());
                        break;
                    case STATE_NONE:
                    case STATE_CONNECTED:
                        // Either not ready or already connected. Terminate new socket.
                        try {
                            socket.close();
                        } catch (IOException e) {
                            Log.e(TAG, "Could not close unwanted socket", e);
                        }
                        break;
                    }
                }
            }
        }

Answer 1

如果在初始化课程时可以将引用传递给Activity，则可以使用runOnUiThread()。例如，

全球指针......

Activity mActivity;

你的构造函数......

public MyClass(Activity activity) {
    mActivity = activity;
}

MyClass内显示祝酒词的方法......

public void showToast(String message, int duration) {
    mActivity.runOnUiThread(new Runnable() {
        public void run() {
            Toast.makeText(mActivity, message, duration);
        }
    }
}

然后随时调用该方法。

来自Thread的Toast消息

1 个答案: