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package com.example.myborad;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
public class MainActivity extends Activity {
private IntentFilter intentfile;
private NetworkChangeReciver network;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
intentfile=new IntentFilter();
intentfile.addAction("android.net.conn.CONNECTIVITY_CHANGE");
network=new NetworkChangeReciver();
registerReceiver(network, intentfile);
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
unregisterReceiver(network);
}
class NetworkChangeReciver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub'
ConnectivityManager connectivityManager=(ConnectivityManager)getSystemService(context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo=connectivityManager.getActiveNetworkInfo();
if(networkInfo!=null&&networkInfo.isAvailable())
Toast.makeText(context, "当前网络正常!", Toast.LENGTH_SHORT).show();
else
Toast.makeText(context, "当前网络处于断网!", Toast.LENGTH_SHORT).show();
}
}
}
网络监听从无到有,这也是变化。