WIFI framework

最新推荐文章于 2025-03-29 09:42:03 发布

原创最新推荐文章于 2025-03-29 09:42:03 发布 · 449 阅读

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本文详细解析了Android系统中WifiService的实现机制，包括关键类如WifiService.java、WifiControl.java等的作用，以及AsyncTask、Handler、HandlerThread在WifiServiceImpl中的应用。探讨了AsyncChannel的连接过程和原理，为理解Android Wifi模块提供了深入视角。

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framework:

1. getSystemService(Context.WIFI_SERVICE)
mWifiManager = (WifiManager) context.getApplicationContext().getSystemService(Context.WIFI_SERVICE);

2. AsyncChannel

    private synchronized AsyncChannel getChannel() {
        if (mAsyncChannel == null) {
            Messenger messenger = getWifiServiceMessenger();
            if (messenger == null) {
                throw new IllegalStateException(
                        "getWifiServiceMessenger() returned null!  This is invalid.");
            }

            mAsyncChannel = new AsyncChannel();
            mConnected = new CountDownLatch(1);

            Handler handler = new ServiceHandler(mLooper);
            mAsyncChannel.connect(mContext, handler, messenger);
            try {
                mConnected.await();
            } catch (InterruptedException e) {
                Log.e(TAG, "interrupted wait at init");
            }
        }
        return mAsyncChannel;
    }


关键的类：
WifiService.java　－－－－WifiServiceImpl.java
WifiControl.java
WifiStateMashin.java

WifiServiceImpl中关键技术点：
AsyncTask: 
     class TdlsTask extends AsyncTask<TdlsTaskParams, Integer, Integer> {
     new TdlsTask().execute(params);

Handler: 
private class ClientHandler extends Handler {
private class WifiStateMachineHandler extends Handler {

HandlerThread:
HandlerThread wifiThread = new HandlerThread("WifiService");
wifiThread.start();
HandlerThread wifiStateMachineThread = new HandlerThread("WifiStateMachine");
wifiStateMachineThread.start();

可参考:
AsyncChannel的使用和原理