学习笔记一 Android 网络是否连接

来源：互联网发布：人工智能应用公共交通编辑：程序博客网时间：2024/06/07 04:59

整理一下，以备后用。如有错误，欢迎指正。

1.networkinfo.isConnected

ConnectivityManager conMan = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);conMan.getNetworkInfo(TYPE_ETHERNET).isConnected()

返回一个Boolean 类型的值

2.networkinfo.isAvailable()

public static boolean isNetworkAvailabe(final Context context) {        boolean netStatus = false;        ConnectivityManager connectManager = (ConnectivityManager) context                .getSystemService(Context.CONNECTIVITY_SERVICE);        connectManager.getActiveNetworkInfo();        if (connectManager.getActiveNetworkInfo() != null) {            netStatus = connectManager.getActiveNetworkInfo().isAvailable();        }        return netStatus;    }

3.networkInfo.getState()

 public static boolean isCurrentNetConnected(Context context) {        ConnectivityManager conMan = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        State mobile = conMan.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();        State wifi = conMan.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();        if (mobile == State.CONNECTED || wifi == State.CONNECTED) {            return true;        } else {            return false;        }    }

源码分析：

networkinfo.isConnected

  public boolean isConnected() {        synchronized (this) {            return mState == State.CONNECTED;        }    }

networkInfo.getState()

public State getState() {        synchronized (this) {            return mState;        }    }

由源码，可以看出，这两个的值其实是一个。同时可以看出State（枚举源码如下）的值中只有CONNECTED代表连接。

<span style="font-size:32px;"> public enum State {        CONNECTING, CONNECTED, SUSPENDED, DISCONNECTING, DISCONNECTED, UNKNOWN    }</span>

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