Android check the net and go to the setting acvivity by intent

we used need to check the user's net is work before we need to connect the work.how can we do this?

just see the code:

private void checkNet(){
		ConnectivityManager cm = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
		
		NetworkInfo info = cm.getActiveNetworkInfo();
		
		if(info !=null && info.isConnected()){
			Toast.makeText(this, "net is working", 0).show();
		}else{
			Toast.makeText(this, "net isn't work", 0).show();
			// jump to the setting 
			Intent intent = new Intent();
			intent.setClassName("com.android.setting", "com.android.settings.WirelessSettings");
			startActivity(intent);
		}
	}

and u need to add the permission to ur AndroidManifest.xml:

android.permission.ACCESS_NETWORK_STATE