Android 监听网络变化

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• 首先在清单文件里加入权限

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

• NetworkChangeReceiver.class

public class NetworkChangeReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
        if (null != networkInfo && networkInfo.isAvailable()) {
            switch (networkInfo.getType()) {
                case ConnectivityManager.TYPE_MOBILE:
                    Toast.makeText(context, "正在使用2G/3G/4G网络", Toast.LENGTH_SHORT).show();
                    break;
                case ConnectivityManager.TYPE_WIFI:
                    Toast.makeText(context, "正在使用wifi上网", Toast.LENGTH_SHORT).show();
                    break;
                default:
                    break;
            }
        } else {
            Toast.makeText(context, "当前网络不可用", Toast.LENGTH_SHORT).show();
        }

    }
}

• 在BaseApp.class中注册广播

public class BaseApp extends Application {

    private NetworkChangeReceiver receiver;

    @Override
    public void onCreate() {
        super.onCreate();
        IntentFilter filter = new IntentFilter();
        filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
        receiver = new NetworkChangeReceiver();
        registerReceiver(receiver, filter);
    }

    @Override
    public void onLowMemory() {
        super.onLowMemory();
        if (null != receiver) {
            unregisterReceiver(receiver);
        }
    }
}