Android detects network connection

Android detects network connection

Permission:

The Code is as follows:

Package com. example. nettest;

Import android.net. ConnectivityManager;
Import android.net. NetworkInfo. State;
Import android. OS. Bundle;
Import android. app. Activity;
Import android. app. AlertDialog;
Import android. content. ComponentName;
Import android. content. Context;
Import android. content. DialogInterface;
Import android. content. Intent;
Import android. view. Menu;
Import android. widget. TextView;
Import android. widget. Toast;


Public class MainActivity extends Activity {


Private ConnectivityManager manager;
Private TextView TV;
StringBuffer sb = new StringBuffer (256 );


@ Override
Protected void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
SetContentView (R. layout. activity_main );


TV = (TextView) findViewById (R. id. textView1 );
CheckNetworkState ();
}


/**
* Check whether the network is connected
*
* @ Return
*/
Private boolean checkNetworkState (){
Boolean flag = false;
// Obtain the network connection information
Manager = (ConnectivityManager) getSystemService (Context. CONNECTIVITY_SERVICE );
// Determine whether the network is connected
If (manager. getActiveNetworkInfo ()! = Null ){
Flag = manager. getActiveNetworkInfo (). isAvailable ();
}
If (! Flag ){
SetNetwork ();
} Else {
IsNetworkAvailable ();
}
TV. setText (sb. toString ());
Return flag;
}


/**
* When the network is not connected, call the setting method.
*/
Private void setNetwork (){
Toast. makeText (this, "wifi is closed! ", Toast. LENGTH_SHORT). show ();
AlertDialog. Builder builder = new AlertDialog. Builder (this );
Builder. setIcon (R. drawable. ic_launcher );
Builder. setTitle ("Network prompt information ");
Builder. setMessage ("the network is unavailable. If you want to continue, set the network first! ");
Builder. setPositiveButton ("set", new DialogInterface. OnClickListener (){
@ Override
Public void onClick (DialogInterface dialog, int which ){
Intent intent = null;
/**
* Determine the version of the mobile phone system! If the API is greater than 10, it is 3.0 +. Because the setting of version 3.0 or later is different from that of version 3.0 or lower, the called method is different.
*/
If (android. OS. Build. VERSION. SDK_INT> 10 ){
Intent = new Intent (
Android. provider. Settings. ACTION_SETTINGS );
} Else {
Intent = new Intent ();
ComponentName component = new ComponentName (
"Com. android. settings ",
"Com. android. settings. WirelessSettings ");
Intent. setComponent (component );
Intent. setAction ("android. intent. action. VIEW ");
}
StartActivity (intent );
}
});


Builder. setNegativeButton ("cancel", new DialogInterface. OnClickListener (){
@ Override
Public void onClick (DialogInterface dialog, int which ){
}
});
Builder. create ();
Builder. show ();
}


/**
* The network is connected, and then you can determine whether the Wi-Fi connection or GPRS connection has set some logical calls.
*/
Private void isNetworkAvailable (){


State gprs = manager. getNetworkInfo (ConnectivityManager. TYPE_MOBILE)
. GetState ();
State wifi = manager. getNetworkInfo (ConnectivityManager. TYPE_WIFI)
. GetState ();
If (gprs = State. CONNECTED | gprs = State. CONNECTING ){
Toast. makeText (this, "gprs is open! ", Toast. LENGTH_SHORT). show ();
Sb. append ("\ ngprs is open! ");
} Else {
Sb. append ("\ ngprs is closed! ");
}


// The advertisement is loaded only when it is determined to be wifi. If it is a GPRS mobile phone network, it is not loaded!
If (wifi = State. CONNECTED | wifi = State. CONNECTING ){
Toast. makeText (this, "wifi is open! ", Toast. LENGTH_SHORT). show ();
LoadAdmob ();
Sb. append ("\ nwifi is open! ");
} Else {
Sb. append ("\ nwifi is closed! ");
}


}


/**
* Admob advertisement loading in wifi status
*/
Private void loadAdmob (){
Toast. makeText (getApplicationContext (), "ad is loding...", 1). show ();
Sb. append ("\ NADIS loding ...");
}
}