Android开发之判断网络状态

// 判断网络状态
    public boolean isNetworkConnected(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo = mConnectivityManager
                    .getActiveNetworkInfo();
            if (mNetworkInfo != null) {
                return mNetworkInfo.isAvailable();
            }
        }
        return false;
    }

if (isNetworkConnected(this)) {
            Toast.makeText(getApplicationContext(), "有网", 1000).show();
        } else {
            Toast.makeText(getApplicationContext(), "没网", 1000).show();
        }