线程阻塞在Android的UI

本文介绍了线程阻塞在Android的UI的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我使用来自Android的蓝牙指南此示例code，发现这里的 developer.android/guide/topics/connectivity/bluetooth.html 作为连接客户端之下。

I am using this sample code from the Android Bluetooth guide, found here developer.android/guide/topics/connectivity/bluetooth.html under "Connecting as a Client".

private class ConnectThread extends Thread { private final BluetoothSocket mmSocket; private final BluetoothDevice mmDevice; public ConnectThread(BluetoothDevice device) { // Use a temporary object that is later assigned to mmSocket, // because mmSocket is final BluetoothSocket tmp = null; mmDevice = device; // Get a BluetoothSocket to connect with the given BluetoothDevice try { // MY_UUID is the app's UUID string, also used by the server code tmp = device.createRfcommSocketToServiceRecord(MY_UUID); } catch (IOException e) { } mmSocket = tmp; } public void run() { // Cancel discovery because it will slow down the connection mBluetoothAdapter.cancelDiscovery(); try { // Connect the device through the socket. This will block // until it succeeds or throws an exception mmSocket.connect(); } catch (IOException connectException) { // Unable to connect; close the socket and get out try { mmSocket.close(); } catch (IOException closeException) { } return; } // Do work to manage the connection (in a separate thread) manageConnectedSocket(mmSocket); } /** Will cancel an in-progress connection, and close the socket */ public void cancel() { try { mmSocket.close(); } catch (IOException e) { } }

}

在我的onCreate，我称之为

In my onCreate, I call

protected void onCreate(Bundle savedInstanceState) { setContentView(R.layout.activity_main); super.onCreate(savedInstanceState); connectionManager= new ConnectionManager(this); connectionManager.start();

本的ConnectionManager启动一个ConnectThread和连接线成功地连接到另一台蓝牙设备。然而，布局不会呈现直到ConnectThread回报率（确切地说，当mmSocket.connect（）停止阻塞）。我怎样才能获得的布局首先显示？

The connectionManager launches a ConnectThread and the connect thread successfully connects to another bluetooth device. However, the layout isn't rendered until the ConnectThread returns (exactly, when mmSocket.connect() stops blocking). How can I get the layout to display first?

推荐答案

记住，的setContentView（）只需要一次行动的onCreate（）方法返回。考虑到这一点，你应该运行在另一个线程，而不是在UI线程code。

Remember, setContentView() only takes action once the onCreate() method returns. Taking this into account, you should run the code in another thread and not in the UI thread.

您code应该是这个样子：

Your code should look something like this:

protected void onCreate(Bundle savedInstanceState) { setContentView(R.layout.activity_main); super.onCreate(savedInstanceState); new Thread(new Runnable() { @Override public void run() { connectionManager= new ConnectionManager(this); connectionManager.start(); } }).start(); }