The android phone checks for network status

From the point of view of program development, the following comments can be understood:

connectivitymanager manager = (connectivitymanager) getsystemservice(connectivity_service);

Check the network connection, if there is no network available, there is no need to connect to the network, etc.

networkinfo info = ;

if (info == null ||

return "No internet connection";

return "The internet is unblocked";

During the development of the project, our applications are processed with a network, but we also need to consider what will happen to the application without a network, so we need to obtain the current network information.

To obtain network information, you need to add the appropriate permissions to the file.

1) Check whether there is a network connection.

2) Determine whether the wifi network is available.

3) Determine whether the mobile network is available.

4) Get the type information of the current network connection.

When developing Android applications, it is often necessary to check the network status when it comes to network access, so as to provide users with the necessary reminders. This can usually be done through the ConnectivityManager.

When we want to listen to the network status in the program, we only need to take a few steps

1. Define a receiver to overload the onrreceive function in it, and complete the required functions in it, such as changing the appearance of the space according to whether the wifi and GPRS are disconnected.

2. Register the receiver in the appropriate place, you can register it in the program, and call the following function in oncreate:

3. When appropriate, cancel the registration of the receiver, you can take the worm in the program, and call the following function in ondestroye:

Many friends will encounter the type judgment of mobile phone network in Android development, because as far as the current Android platform mobile phone is concerned: there may be 4 states:

These four states, if there is no network, it is definitely impossible to request the Internet, if it is a wap, you need to add China Mobile to the mobile phone**.

Here's how to judge the network late::

Because we get the service object, the network status is refreshed from time to time, so we only need to get the network status!

Final Summary: Tools:

baseactivity:

mainactivity

logs.

Application scenario: Determine whether the current network is available.

There are currently available networks, as shown in the figure below

There is currently no network available, as shown below

Steps: 1. Obtain the connectivitymanager object 2. Obtain the networkinfo object.

get networkinfo object networkinfo networkinfo = ;

3. Check whether the current network status is the connection state.

if (networkinfo[i].getState() ==4, add permission to access the current network state.

**As follows: Result printed out by the console: