Java 如何延迟textview输出？

我正在使用下面的代码连接到wifi网络。有没有办法延迟textview文本的输出，使其在连接到wifi之前不会显示？消息在实际连接之前出现

import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;

import android.widget.Button;
import android.widget.TextView;

public class TestActivity extends Activity {
/** Called when the activity is first created. 
 * @return */



@Override
public void onCreate(Bundle savedInstanceState) {    
    super.onCreate(savedInstanceState);          


    setContentView(R.layout.main);
    Button OffWifi = (Button)findViewById(R.id.offwifi);
    OffWifi.setOnClickListener(new OnClickListener() { 
      public void onClick(View v) {   

          WifiManager wifiManager = (WifiManager)getBaseContext().getSystemService(Context.WIFI_SERVICE);
            wifiManager.setWifiEnabled(false);          
          }        
      });


    TextView tv= (TextView) findViewById(R.id.tv); 

    WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE); 
    WifiConfiguration wc = new WifiConfiguration();  
    wc.SSID = "\"Test\""; //IMP! This should be in Quotes!! 

    wc.hiddenSSID = true; 
    wc.status = WifiConfiguration.Status.ENABLED;      
    wc.priority = 10; 
    wc.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); 
    wc.allowedProtocols.set(WifiConfiguration.Protocol.RSN);  
    wc.allowedProtocols.set(WifiConfiguration.Protocol.WPA); 
    wc.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN); 
    wc.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED); 
    wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP); 
    wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP); 
    wc.preSharedKey = "\"Password\""; 
    WifiManager  wifiManag = (WifiManager) this.getSystemService(WIFI_SERVICE); 
    boolean res1 = wifiManag.setWifiEnabled(true); 
    int res = wifi.addNetwork(checkPreviousConfiguration(wc)); 
    Log.d("WifiPreference", "add Network returned " + res ); 
    boolean es = wifi.saveConfiguration(); 
    Log.d("WifiPreference", "saveConfiguration returned " + es ); 
    boolean b = wifi.enableNetwork(res, true);    
    Log.d("WifiPreference", "enableNetwork returned " + b );   



         ConnectivityManager connec = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE); 

         if (connec != null && (connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED) ||(connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED)){  

             tv.setText("You are now connected!  " +  "Version 1.1"); 
            }else if (connec.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED ||  connec.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED ) {              

                tv.setText("The was an error connecting, please try again."); 
            }  

    }     




 public WifiConfiguration checkPreviousConfiguration(WifiConfiguration wc) {
WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE); 
 List<WifiConfiguration> configs = wifi.getConfiguredNetworks();     
    for(WifiConfiguration config : configs) {         
        if(config.SSID.equals(wc.SSID)) return config;     
        }     
    return wc; 
    } 

}

import java.util.List；
导入android.app.Activity；
导入android.os.Bundle；
导入android.content.Context；
导入android.net.ConnectivityManager；
导入android.net.NetworkInfo；
导入android.net.wifi.WifiConfiguration；
导入android.net.wifi.WifiManager；
导入android.util.Log；
导入android.view.view；
导入android.view.view.OnClickListener；
导入android.widget.Button；
导入android.widget.TextView；
公共类测试活动扩展了活动{
/**在首次创建活动时调用。
*@返回*/
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.main）；
WiFi按钮=（按钮）findViewById（R.id.OffWifi）；
setOnClickListener（新的OnClickListener（）{
公共void onClick（视图v）{
WifiManager WifiManager=（WifiManager）getBaseContext（）.getSystemService（Context.WIFI_SERVICE）；
wifiManager.setWifiEnabled（false）；
}        
});
TextView tv=（TextView）findViewById（R.id.tv）；
WifiManager wifi=（WifiManager）getSystemService（Context.wifi\u SERVICE）；
WifiConfiguration wc=新的WifiConfiguration（）；
wc.SSID=“\”Test\”；//IMP！应该用引号括起来！！
wc.hiddenSSID=true；
wc.status=WifiConfiguration.status.ENABLED；
wc.priority=10；
wc.allowedKeyManagement.set（wificonfig.keymanagement.WPA\u PSK）；
wc.allowedProtocols.set（WifiConfiguration.Protocol.RSN）；
wc.allowedProtocols.set（WifiConfiguration.Protocol.WPA）；
wc.allowedAuthAlgorithms.set（WifiConfiguration.AuthAlgorithm.OPEN）；
wc.allowedAuthAlgorithms.set（WifiConfiguration.AuthAlgorithm.SHARED）；
wc.allowedPairwisecipher.set（WifiConfiguration.Pairwiseciper.CCMP）；
wc.allowedPairwisecipher.set（WifiConfiguration.Pairwiseciper.TKIP）；
wc.preSharedKey=“\”密码\”；
WifiManager wifiManag=（WifiManager）this.getSystemService（WIFI_服务）；
布尔值res1=wifiManag.setWifiEnabled（真）；
int res=wifi.addNetwork（checkPreviousConfiguration（wc））；
Log.d（“WifiPreference”，“添加返回的网络”+res）；
布尔es=wifi.saveConfiguration（）；
Log.d（“WifiPreference”、“saveConfiguration returned”+es）；
布尔b=wifi.enableNetwork（res，true）；
Log.d（“WifiPreference”、“enableNetwork returned”+b）；
ConnectivityManager connec=（ConnectivityManager）getSystemService（Context.CONNECTIVITY_服务）；
如果（connec！=null&&（connec.getNetworkInfo（1.getState（）==NetworkInfo.State.CONNECTED）| |（connec.getNetworkInfo（0.getState（）==NetworkInfo.State.CONNECTED））{
tv.setText（“您现在已连接！”+“版本1.1”）；
}如果（connec.getNetworkInfo（0）.getState（）==NetworkInfo.State.DISCONNECTED | | connec.getNetworkInfo（1）.getState（）==NetworkInfo.State.DISCONNECTED）{
tv.setText（“连接时出错，请重试”）；
}  
}     
公共无线配置检查先前配置（无线配置wc）{
WifiManager wifi=（WifiManager）getSystemService（Context.wifi\u SERVICE）；
List configs=wifi.getConfiguredNetworks（）；
对于（WifiConfiguration config:configs）{
if（config.SSID.equals（wc.SSID））返回config；
}     
返回wc；
} 
}

在我看来，您需要收听意图广播。

使用

AsyncTask

并将连接放入

doInBackground

，

setText

放入

onPostExecute

public class Connect extends AsyncTask<String, Void, Boolean> {

private Activity activity;
private Context context;

public LoadContacts(Activity activity){
    this.activity=activity;
    context = activity;
}

@Override
protected void onPreExecute() {
    // TODO Auto-generated method stub
    super.onPreExecute();

}

@Override
protected void onPostExecute(Boolean result) {
    TextView tv= (TextView) activity.findViewById(R.id.tv); 
    if (connec != null && (connec.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED) ||(connec.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED)){  

         tv.setText("You are now connected!  " +  "Version 1.1"); 
        }else if (connec.getNetworkInfo(0).getState() == NetworkInfo.State.DISCONNECTED ||  connec.getNetworkInfo(1).getState() == NetworkInfo.State.DISCONNECTED ) {              

            tv.setText("The was an error connecting, please try again."); 
        }
    super.onPostExecute();
}

@Override
protected Boolean doInBackground(String... params) {
    WifiManager wifi = (WifiManager) activity.getSystemService(Context.WIFI_SERVICE); 
WifiConfiguration wc = new WifiConfiguration();  
wc.SSID = "\"Test\""; //IMP! This should be in Quotes!! 

wc.hiddenSSID = true; 
wc.status = WifiConfiguration.Status.ENABLED;      
wc.priority = 10; 
wc.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); 
wc.allowedProtocols.set(WifiConfiguration.Protocol.RSN);  
wc.allowedProtocols.set(WifiConfiguration.Protocol.WPA); 
wc.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN); 
wc.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED); 
wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP); 
wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP); 
wc.preSharedKey = "\"Password\""; 
WifiManager  wifiManag = (WifiManager) context.getSystemService(WIFI_SERVICE); 
boolean res1 = wifiManag.setWifiEnabled(true); 
int res = wifi.addNetwork(checkPreviousConfiguration(wc)); 
Log.d("WifiPreference", "add Network returned " + res ); 
boolean es = wifi.saveConfiguration(); 
Log.d("WifiPreference", "saveConfiguration returned " + es ); 
boolean b = wifi.enableNetwork(res, true);    
Log.d("WifiPreference", "enableNetwork returned " + b );   



     ConnectivityManager connec = (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE); 

    return true;
}

}

---

代码没有经过测试，可能会有一些错误，但我希望你能理解这一点……

我认为不能保证他为连接WIFI而进行的那些函数调用会同步发生。我尝试了代码，但现在我得到了一个错误04-20 17:35:46.191:E/AndroidRuntime（338）：java.lang.RuntimeException:执行doInBackground（）时出错

public class TestActivity extends Activity {
/** Called when the activity is first created. 
 * @return */

@Override
public void onCreate(Bundle savedInstanceState) {    
super.onCreate(savedInstanceState);          


setContentView(R.layout.main);

new Connect(this).execute();
}