线程阻塞在Android的UI [英] Thread blocking UI in android

问题描述

我使用来自Android的蓝牙指南此示例code，发现这里的 http://developer.android.com/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 http://developer.android.com/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();
}

这篇关于线程阻塞在Android的UI的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！