Question

帮助我...... 我使用此代码检查Internet连接，但在每个状态中它都返回“false”

 boolean check;
    ConnectivityManager connectivityManager 
    =(ConnectivityManager)this.getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
 NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
  check=(activeNetworkInfo != null && activeNetworkInfo.isConnected());

Answer 1

试试这段代码

此代码检查所有类型的网络连接，如wifi，网络数据等... 当你想检查互联网连接时，只需要调用此方法，如

 if (isConnectingToInternet(this)) { 
   //do internet available here 
 }
 else{
   //internet not available here 
 }


public static boolean isConnectingToInternet(Context _context) {
    ConnectivityManager connectivity = (ConnectivityManager) _context
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connectivity != null) {
        NetworkInfo[] info = connectivity.getAllNetworkInfo();
        if (info != null)
            for (int i = 0; i < info.length; i++)
                if (info[i].getState() == NetworkInfo.State.CONNECTED) {
                    Log.d("Network",
                            "NETWORKnAME: " + info[i].getTypeName());
                    return true;
                }
    }
    return false;
}

Answer 2

protected boolean isNetworkConnected() {
    Context ctx = this;
    ConnectivityManager cm = (ConnectivityManager) ctx
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo info = cm.getActiveNetworkInfo();
    if (info != null)
        return info.isAvailable();
    else
        return false;
}

还在清单中设置了以下权限

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Answer 3

试试这个，

创建一个ConnectionDetector类。

public class ConnectionDetector {

private Context _context;
public ConnectionDetector(Context context){
    this._context = context;
}

/**
 * Checking for all possible Internet providers
 * **/
public boolean isConnectingToInternet(){
    ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);
      if (connectivity != null)
      {
          NetworkInfo[] info = connectivity.getAllNetworkInfo();
          if (info != null)
              for (int i = 0; i < info.length; i++)
                  if (info[i].getState() == NetworkInfo.State.CONNECTED)
                  {
                      return true;
                  }

      }
      return false;
   }

}

当你想在任何活动/片段/其他人检查互联网时使用此代码..

 ConnectionDetector conn = new ConnectionDetector(ActivityName.this);
                    if(conn.isConnectingToInternet()){
                    // Do your Network Operations 
                    }else{
                        // No Network , show a dialog , etc
                    }

的Manifest.xml

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

我想查看Internet连接

3 个答案: