Android network status judgment (WiFi, 3G, 2G)

First you need to add permissions

The code is as follows	Copy Code
<uses-permission android:name= "Android.permission.ACCESS_NETWORK_STATE" ></uses-permission> <uses-permission android:name= "Android.permission.INTERNET"/>

Check the network status code as follows

The code is as follows

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public boolean checknetworkstate () { Boolean flag = false; Connectivitymanager manager = (Connectivitymanager) getsystemservice ( Context.connectivity_service); if (manager.getactivenetworkinfo ()!= null) { Flag = Manager.getactivenetworkinfo (). isavailable (); } if (!flag) { Alertdialog.builder Builder = new Alertdialog.builder (this); Builder.seticon (Android. R.drawable.ic_dialog_alert); Builder.settitle (r.string.netstate); Builder.setmessage (r.string.setnetwork); Builder.setpositivebutton (R.string.ok, New Dialoginterface.onclicklistener () { @Override public void OnClick (Dialoginterface dialog, int which) { TODO auto-generated Method Stub Intent mintent = new Intent ("/"); ComponentName comp = new ComponentName ("Com.android.settings", "Com.android.settings.WirelessSettings"); Mintent.setcomponent (comp); Mintent.setaction ("Android.intent.action.VIEW"); StartActivity (mintent); } }); Builder.setnegativebutton (R.string.cancel, New Dialoginterface.onclicklistener () { @Override public void OnClick (Dialoginterface dialog, int which) { Dialog.cancel (); } }); Builder.create (); Builder.show (); } return flag; }

The results are as follows: Users can click OK to set up the network, such as starting WiFi

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If you want to do something with a network connection, you need to determine whether the current network state is true, do something about it, or set up a network. It could be another way, actually.

The code is as follows

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Setnetwork public void Setnetwork () { Alertdialog.builder Builder = new Alertdialog.builder (this); Builder.seticon (Android. R.drawable.ic_dialog_alert); Builder.settitle (r.string.netstate); Builder.setmessage (r.string.setnetwork); Builder.setpositivebutton (R.string.ok, New Dialoginterface.onclicklistener () { @Override public void OnClick (Dialoginterface dialog, int which) { TODO auto-generated Method Stub Intent mintent = new Intent ("/"); ComponentName comp = new ComponentName ("Com.android.settings", "Com.android.settings.WirelessSettings"); Mintent.setcomponent (comp); Mintent.setaction ("Android.intent.action.VIEW"); StartActivity (mintent); } }); Builder.setnegativebutton (R.string.cancel, New Dialoginterface.onclicklistener () { @Override public void OnClick (Dialoginterface dialog, int which) { Dialog.cancel (); } }); Builder.create (); Builder.show (); } Network public boolean isnetworkavailable () { Context context = Getapplicationcontext (); Connectivitymanager connect = (Connectivitymanager) context.getsystemservice ( Context.connectivity_service); if (connect==null) { return false; }else//get All network Info { Networkinfo[] info = Connect.getallnetworkinfo (); if (info!=null) { for (int i=0;i<info.length;i++) { if (Info[i].getstate () ==networkinfo.state.connected) { return true; } } } } return false; }

Then, by judging if the current state is available, execute the relevant code, and then set up the network

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if (isnetworkavailable ()) { Related code }else { Setnetwork (); }]

This article has introduced the network state of the judgment, but after testing found that the method can only determine whether WiFi connectivity, and now the smart machine can be WiFi, 3G, or even 2G. So if you don't use the above method, you need to make changes so that it's not connected to the network (WiFi, 3G, 2G). The code is as follows

The code is as follows

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Check Network public void Checknetworkstate () { Boolean flag = false; Connectivitymanager manager = (Connectivitymanager) getsystemservice ( Context.connectivity_service); state mobile = Manager.getnetworkinfo (Connectivitymanager.type_mobile). GetState (); state WiFi = Manager.getnetworkinfo (Connectivitymanager.type_wifi). GetState (); If the network status of 3G, WiFi, 2G and so on is connected, exit, otherwise the display prompts the information to enter the network Setup interface if (mobile = state.connected| | mobile==state.connecting) Return if (WiFi = state.connected| | wifi==state.connecting) Return Showtips (); } private void Showtips () { Alertdialog.builder Builder = new Alertdialog.builder (this); Builder.seticon (Android. R.drawable.ic_dialog_alert); Builder.settitle (r.string.netstate); Builder.setmessage (r.string.setnetwork); Builder.setpositivebutton (R.string.ok, New Dialoginterface.onclicklistener () { @Override public void OnClick (Dialoginterface dialog, int which) { If there is no network connection, enter the network Setup interface StartActivity (New Intent (settings.action_wireless_settings)); } }); Builder.setnegativebutton (R.string.cancel, New Dialoginterface.onclicklistener () { @Override public void OnClick (Dialoginterface dialog, int which) { Dialog.cancel (); } }); Builder.create (); Builder.show (); }

The way is simpler and more useful, of course, the first article also has the merit, may add the 3G state check can
Note: Don't forget to add the permission

The code is as follows	Copy Code
<uses-permission android:name= "Android.permission.ACCESS_NETWORK_STATE" ></uses-permission>