How to directly access WifiService and androidwifiservice at the android framework layer from C ++ code
After all, the service at the Java layer is the encapsulation of the binder at the C ++ layer. In principle, it is entirely possible to directly access the service at the android framework layer through the C ++ code, this article uses WifiService as an example to explain how to implement this function.
To put it bluntly, go directly to the Code:
WifiTest. cpp
#include
The basic idea
network is testing, and the password (psk) is testingPassword.
Adding the network details to the rassberry pi (add the network to Raspberry PI)
Use the nano editor to open the wpa-supplicant configuration file:
Sudo nano/etc/wpa_supplicant/wpa_supplicant.conf
Add the following content at the bottom of the file:
Network = {Ssid = "The_ESSID_from_earlier"Psk = "Your_wifi_password"}
In this example, we should
entering the admin address, please click here:
1
, start Setup Wizard
After entering the router's admin interface, click the
Setup Wizard and click
Next .
2
, choose the way of Internet
If you are using the Broadband account password for PPPoE dial-up Internet access, follow the article instructions to continue Setup. If it is other forms of Internet access, please choose
PPPoE
(
ADSL
virtual dial-up)
, click
Next .
switch with the information recognition service of the caller's phone number and a terminal with the function of displaying the caller's phone number, on the terminal, information such as the phone number and call time of the caller can be displayed.
I. background of CID Technology
Bell Communications Research Office (Bellcore) first introduced the Voice Band Data Communication modulation and demodulation method to achieve CID business, and in 1990 put forward related technical suggestions (TR-
Use the Iwconfig command:Search Wireless network iwlist wlan0 ScanWrite down Essid.Connect a wireless network without a password iwconfig wlan0 Essid chinanet where chinanet is the search for a wireless network EssidConnect a password to the wireless network Iwconfig wlan0 Essid chinanet key xxxx where xxxx is the passwordEnable wireless card ifconfig wlan0 upGet IP dhclient wlan0 or dhcpcd wlan0 via DHCP?$vi/etc/network/interfaces Add the following:Auto Wlan0Iface Wlan0 inet DHCPpre-up IP link
information about the network. For example:1, ESSID: "Testing": This is the name of the WiFi network.2, Ie:ieee 802.11I/WPA2 Version1: This part represents the network authentication method, here is the WPA2, this is one to replace the WPA1 the update more secure wireless network standard. This guide should apply to WEP, WPA, or WPA2, but may not be available for Enterprise Edition WPA2.You also need the password for your wifi network. Most home routers (default passwords) are labeled on the ba
About Wpa_supplicant:Use the WPA_CLI command.Wpa_cli-iwlan0 add_network//Wlan0 is the name of the wireless network device, and adding a network will return a number, assuming 1Wpa_cli-iwlan0 set_network 1 SSID ' ... '//Here The SSID is the network name to be connected, note that the following is a single quote + double quotation markWpa_cli-iwlan0 set_network 1 PSK ' "..." '//Here PSK is the passwordWpa_cli
connect WiFi but not the internet
For why only the Phantom of the MX2 mobile phone can even wifi but can't access the problem, small codec is not familiar with encryption technology, can only simply think that the charm of the family MX2 WiFi security requirements higher ... If you have friends who are more aware of this problem, please write a question for the small.
Mobile phone with WiFi, but no network solution
Since you know that the WiFi encryption type is chosen by default for "Automa
by not encrypting the wireless network of the router, when everyone else can join the wireless network.
WPA-PSK/WPA2-PSK: Router wireless network encryption, if selected, please enter a password in the PSK password, the password requires 8-63 ASCII characters or 8-64 16 characters.
Do not modify wireless security settings: Select this option to keep the last s
devices, and if the router has a hidden SSID, then other smartphones and notebooks will not be able to search our wireless network, which can effectively enhance the security of the network.
Tp-link Wireless router Settings hide SSID is simple, in the wireless settings of the basic security settings, the "open SSID broadcast" before the check out, and then click Save
Ps. Hide SSID, hackers can use other tools to find, but can make most mobile phone, book users cannot find, unless using profes
information.
Third, set the hidden SSID
The SSID is the wireless network name that we can search for using wireless devices, and if the router has a hidden SSID, then other smartphones and notebooks will not be able to search our wireless network, which can effectively enhance the security of the network.
Tp-link Wireless router Settings hide SSID is simple, in the wireless settings of the basic security settings, the "open SSID broadcast" before the check out, and then click Save, as show
Tools/raw Materials
Routers, desktops, or laptops
Method/Step
First to open the browser, double-click the desktop's IE browser icon, into the browser
Then enter 192.168.0.1 or 192.168.1.1 In the address bar of the browser and enter the router Setup interface by knocking down the carriage
Click on the router settings on the right side of the homepage, there is a wireless setting, click to go to the wireless settings interface
In wireless secur
configuration.
In the page shown in the following illustration, the SSID can be arbitrarily modified to the name you want (the suggested word or number, or its combination), which is the name of your wireless network and the other values remain intact. In the security options area, it is recommended that you select "Wpa-psk/wpa2-psk PSK password" an
to complete add, then Point DHCP tab, click + New DHCP serviceName:server1Interface:lanAddress Pool:pool1Click OK to complete the add
4. Set wireless network card as wireless APFirst in the interface should be able to find and correctly identify your wireless network card model, or you can not continueClick on the wireless on the left, click Security Profiles in the window, and click on the new secure authentication profile.Name:wpa2-pskmode:dynamic keysAuthentication Types:wpa
computer will be able to surf the Internet. Dynamic IP Settings: Select "Dynamic IP (Ethernet broadband, automatically obtain IP address from the service provider)"--> click "Next".
(3), static IP: handled the "Static IP" internet broadband business users, broadband operators to provide a network cable to the user's home, but also provides an IP address, subnet mask, gateway, 2 DNS server address to the user, when not using the router, you need to plug this network cable on the com
DNS server address to the user, when not using the router, you need to plug this network cable on the computer, and set the IP address on the computer according to the IP address information provided.
Static IP Internet settings: Select "Static IP (Ethernet broadband, network service provider to provide fixed IP address)"--> click "Next".
Fill in the operator's assigned IP address, subnet mask, gateway, and DNS server address--> click Next.
6, configure th
, select WPA-PSK/WPA2-PSK encryption mode, in the location of the PSK password set the wireless password, click Save. Do not reboot and continue with the next setting.
2, modify the management IP address
Check the admin address on the back of the router and if it is tplogin.cn, you do not need this step.
Login Router management interface, click Net
Tplink router to set up a switch method
Connect the settings computer to the tl-wr841n LAN port to ensure that the computer automatically obtains the IP address and DNS server address.
Note: To avoid IP conflicts or DHCP server conflicts, do not connect tl-wr841n to the front-end network.
Modify SSID (wireless name)
Login Router Admin interface, enter wireless settings >> basic settings, modify SSID, click Save.
Set Wireless password
Go to Wireless Settings >> wirel
To make the Raspberry Pi convenient operation, it is necessary to configure the wireless network card, which can greatly enhance the mobile and convenience of Raspberry Pi, in fact, the configuration of wireless network card is basically the same as the normal Linux platform configuration wireless network card, several methods are similar, the following:One, the first method: through the configuration of the/etc/network/interfaces file implementationsudo nano/etc/network/interfacesThe contents o
1, the computer connection needs to modify the WiFi, in your browser address bar input 192.168.1.1. Depending on the brand you are using, you may enter a different TP address, please refer to the router's back label.
2, in the Settings page to choose Wireless Settings-Wireless security settings, select WPA-PSK/WPA2-PSK encryption, in the PSK password box
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