网络状态监听

网络状态监听

定义一个广播接收器和状态变化接口

public class NetBroadcastReceiver extends BroadcastReceiver {
    public static ArrayList<NetEventHandler> mListeners = new ArrayList<NetEventHandler>();
    private static String NET_CHANGE_ACTION = "android.net.conn.CONNECTIVITY_CHANGE";
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i("dsc", "dsc");
        if (intent.getAction().equals(NET_CHANGE_ACTION)) {
            MainActivity.mNetWorkState = NetUtil.getNetworkState(context);
            if (mListeners.size() > 0)//通知接口完成加载
                for (NetEventHandler handler : mListeners) {
                    handler.onNetChange();
           }
        }
    }
    public interface NetEventHandler {
        public void onNetChange();
    }
}

网络状态工具类

public class NetUtil {
    public static final int NETWORN_NONE = 0;
    public static final int NETWORN_WIFI = 1;
    public static final int NETWORN_MOBILE = 2;
    public static int getNetworkState(Context context) {
        ConnectivityManager connManager = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        // Wifi
        State state = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI)
                .getState();
        if (state == State.CONNECTED || state == State.CONNECTING) {
            return NETWORN_WIFI;
        }
        // 3G
        state = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE)
                .getState();
        if (state == State.CONNECTED || state == State.CONNECTING) {
            return NETWORN_MOBILE;
        }
        return NETWORN_NONE;
    }
}

主要实现

public class MainActivity extends AppCompatActivity implements NetBroadcastReceiver.NetEventHandler{
    public static int mNetWorkState;
    private NetBroadcastReceiver netReceiver;//网络状态监测
    private boolean netState = false;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //注册网络监听广播
        regist();
    }
    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.e("myLog", "TaskListFragment执行销毁");
        unregisterReceiver(netReceiver);
    }
    /**
     * 注册广播
     */
    private void regist() {
        netReceiver = new NetBroadcastReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
        registerReceiver(netReceiver, filter);
        NetBroadcastReceiver.mListeners.add(this);
    }
    @Override
    public void onNetChange() {
        if (getApplicationContext()== null) {
            return;
        }
        if (NetUtil.getNetworkState(this) == NetUtil.NETWORN_NONE) {//没有网络
            netState = false;
             Toast.makeText(this, "你的网络已断开连接,请检查网络！", Toast.LENGTH_SHORT).show();
        } else if (NetUtil.getNetworkState(this) == NetUtil.NETWORN_WIFI) {//wifi网络
            netState = true;
            Toast.makeText(this, "你目前是wifi网络！", Toast.LENGTH_SHORT).show();
        } else {//手机网络
            netState = true;
             Toast.makeText(this, "你目前是手机网络！", Toast.LENGTH_SHORT).show();
        }
    }
}

AndroidManifest注册

<receiver android:name=".NetBroadcastReceiver"/>

来自为知笔记(Wiz)