如何在我的活动中添加runOnUiThread（）

Question

我添加了AsyncTask来将网络操作卸载到后台线程。我需要确保UI操作位于UI线程上，因此我想在Activity中使用runOnUiThread（）。

谢谢你的帮助

WifiApManager

public class WifiApManager {
private final WifiManager mWifiManager;

public WifiApManager(Context context) {
    mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
}

public boolean setWifiApEnabled(WifiConfiguration wifiConfig, boolean enabled) {
    try {
        if (enabled) { // disable WiFi in any case
            mWifiManager.setWifiEnabled(false);
        }

        Method method = mWifiManager.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, boolean.class);
        return (Boolean) method.invoke(mWifiManager, wifiConfig, enabled);
    } catch (Exception e) {
        Log.e(this.getClass().toString(), "wifi", e);
        return false;
    }
}

public WIFI_AP_STATE getWifiApState() {
    try {
        Method method = mWifiManager.getClass().getMethod("getWifiApState");

        int tmp = ((Integer)method.invoke(mWifiManager));

        // Fix for Android 4
        if (tmp > 10) {
            tmp = tmp - 10;
        }

        return WIFI_AP_STATE.class.getEnumConstants()[tmp];
    } catch (Exception e) {
        Log.e(this.getClass().toString(), "wifi", e);
        return WIFI_AP_STATE.WIFI_AP_STATE_FAILED;
    }
}


public boolean isWifiApEnabled() {
    return getWifiApState() == WIFI_AP_STATE.WIFI_AP_STATE_ENABLED;
}


public WifiConfiguration getWifiApConfiguration() {
    try {
        Method method = mWifiManager.getClass().getMethod("getWifiApConfiguration");
        return (WifiConfiguration) method.invoke(mWifiManager);
    } catch (Exception e) {
        Log.e(this.getClass().toString(), "wifi", e);
        return null;
    }
}


public boolean setWifiApConfiguration(WifiConfiguration wifiConfig) {
    try {
        Method method = mWifiManager.getClass().getMethod("setWifiApConfiguration", WifiConfiguration.class);
        return (Boolean) method.invoke(mWifiManager, wifiConfig);
    } catch (Exception e) {
        Log.e(this.getClass().toString(), "wifi", e);
        return false;
    }
}


public ArrayList<ClientScanResult> getClientList(boolean onlyReachables) {
    return getClientList(onlyReachables, 10);
}


public ArrayList<ClientScanResult> getClientList(boolean onlyReachables, int reachableTimeout) {
    BufferedReader br = null;
    ArrayList<ClientScanResult> result = null;

    try {
        result = new ArrayList<ClientScanResult>();
        br = new BufferedReader(new FileReader("/proc/net/arp"));
        String line;
        while ((line = br.readLine()) != null) {
            String[] splitted = line.split(" +");

            if ((splitted != null) && (splitted.length >= 4)) {
                // Basic sanity check
                String mac = splitted[3];

                if (mac.matches("..:..:..:..:..:..")) {
                    boolean isReachable = InetAddress.getByName(splitted[0]).isReachable(reachableTimeout);

                    if (!onlyReachables || isReachable) {
                        result.add(new ClientScanResult(splitted[0], splitted[3], splitted[5], isReachable));
                    }
                }
            }
        }
    } catch (Exception e) {
        Log.e(LOGTAG, e.toString());
    } finally {
        try {
            br.close();
        } catch (IOException e) {
            Log.e(LOGTAG, e.toString());
        }
    }
return result;
}
}

connect.java

public class connect extends Activity{
WifiApManager wifiApManager;
TextView tv;
Button scan;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.connect);
    tv =(TextView) findViewById(R.id.iptv);
    new scan().execute();
}
public class scan extends AsyncTask<String, Integer, String> {

public Object WIFI_SERVICE;
@Override
protected void onProgressUpdate(Integer...integers)  {
     ArrayList<ClientScanResult> clients = wifiApManager.getClientList(false);
        tv.setText("WifiApState: " + wifiApManager.getWifiApState() + "\n\n");
        tv.append("Clients: \n");
        for (ClientScanResult clientScanResult : clients) {
            tv.append("####################\n");
            tv.append("IpAddr: " + clientScanResult.getIpAddr() + "\n");
            tv.append("Device: " + clientScanResult.getDevice() + "\n");
            tv.append("HWAddr: " + clientScanResult.getHWAddr() + "\n");
            tv.append("isReachable: " + clientScanResult.isReachable()+ "\n");
            }
}
@Override
        protected void onPostExecute(String result){
            tv.setText(result);             
        }
@Override
protected String doInBackground(String... params) {
    wifiApManager = new WifiApManager(this);
    // the above line shows a Error
    return null;
}
}
}

编辑

我想在TextView中显示已处理的文本

class scan extends AsyncTask<String, Void, Void> { 
public Context context;
ArrayList<ClientScanResult> clients;
public scan(Context c)  // constructor to take Context
{
    context = c;   // Initialize your Context variable
}

protected Void doInBackground(String... params) {
        wifiApManager = new WifiApManager(context);  // use the variable here
         clients = wifiApManager.getClientList(false);
        return null;
}
}           
protected void onPostExecute(Void result){
    ArrayList<ClientScanResult> clients;
    tv.setText("WifiApState: " + wifiApManager.getWifiApState() + "\n\n");
    tv.append("Clients: \n");
    for (ClientScanResult clientScanResult : clients)//showin error in clients
 {
            tv.append("####################\n");
            tv.append("IpAddr: " + clientScanResult.getIpAddr() + "\n");
            tv.append("Device: " + clientScanResult.getDevice() + "\n");
            tv.append("HWAddr: " + clientScanResult.getHWAddr() + "\n");
            tv.append("isReachable: " + clientScanResult.isReachable()+ "\n");
                       }
}
}

Answer 1

我添加了AsyncTask来将网络操作卸载到后台线程。我需要确保UI操作位于UI线程上，因此我想在Activity中使用runOnUiThread（）。

啊! 没有！！！除以外， 每种 方法都AsyncTask可以运行。您也可以通过从进行调用来进行网络操作并更新in 或in 。UI Thread``doInBackground()``doInBackground()``UI``onPostExecute()``onProgressUpdate()``publishProgress()``doInBackground()

请勿runOnUiThread()与一起使用AsyncTask。至少对于我来说，没有理由使用它，AsyncTask因为它具有已经在上运行的方法UI Thread。我从未见过它会做任何事情，但会带来麻烦。

您可以致电publishProgress()您loop，并更新您TextView在onProgressUpdate()或添加值的ArrayList中和更新onProgressUpdate()。

请多次阅读文档。AsyncTask刚开始时有点棘手，但是一旦您了解了它的功能，那么它可能就是一件美丽的事情。

编辑

创建您的实例AsyncTask并将其传递Activity Context给它

Scan myScan = new scan(this); // pass the context to the constructor
myScan.execute();

然后在中创建一个构造函数，AsyncTask并接受Context。

public class scan extends AsyncTask<String, Integer, String> 
{

     public Object WIFI_SERVICE;
     public Context context;   // Context variable

     public scan(Context c)  // constructor to take Context
     {
         context = c;   // intialize your Context variable
     }

现在使用该变量

    @Override
    protected String doInBackground(String... params) 
    {
        wifiApManager = new WifiApManager(context);  // use the variable here
        return null;
    }

另一个编辑

class scan extends AsyncTask<String, Void, Void> {
     ArrayList<ClientScanResult> clients;
     Context context;

...

then initialize your `clients` in `doInBackground()`

clients = wifiApManager.getClientList(false);

改变onPostExecute()为不接受任何东西

protected void onPostExecute(Void result){

然后将更新其中的代码TextView放入其中。