Android实时监听网络状态

1. 新建一个基类BasicActivity.class，在基类中注册网络监听广播NetworkChangeReceiver.class，全部页面的Activity都继承此基类BasicActivity.class

(1)网络状态改变监听类：NetWorkChangReceiver.class

/**
 * 监听网络状态变化
 * Created by Travis on 2017/10/11.
 */

public class NetWorkChangReceiver extends BroadcastReceiver {

    /**
     * 获取链接类型
     *
     * @param type
     * @return
     */
    private String getConnectionType(int type) {
        String connType = "";
        if (type == ConnectivityManager.TYPE_MOBILE) {
            connType = "3G网络数据";
        } else if (type == ConnectivityManager.TYPE_WIFI) {
            connType = "WIFI网络";
        }
        return connType;
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(intent.getAction())) {// 监听wifi的打开与关闭，与wifi的链接无关
            int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0);
            Log.e("TAG", "wifiState:" + wifiState);
            switch (wifiState) {
                case WifiManager.WIFI_STATE_DISABLED:
                    break;
                case WifiManager.WIFI_STATE_DISABLING:
                    break;
            }
        }
        // 监听网络链接，包括wifi和移动数据的打开和关闭,以及链接上可用的链接都会接到监听
        if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {
            //获取联网状态的NetworkInfo对象
            NetworkInfo info = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
            if (info != null) {
                //若是当前的网络链接成功而且网络链接可用
                if (NetworkInfo.State.CONNECTED == info.getState() && info.isAvailable()) {
                    if (info.getType() == ConnectivityManager.TYPE_WIFI || info.getType() == ConnectivityManager.TYPE_MOBILE) {
                        Log.i("TAG", getConnectionType(info.getType()) + "连上");
                        Toast.makeText(context, getConnectionType(info.getType()) + "连上", Toast.LENGTH_SHORT).show();
                    }
                } else {
                    Log.i("TAG", getConnectionType(info.getType()) + "断开");
                    Toast.makeText(context, getConnectionType(info.getType()) + "断开", Toast.LENGTH_SHORT).show();
                }
            }
        }
    }
}

(2)基类 BasicActivity

/**
 * Activity基类:实时获取网络状态
 * create by Travis1022 on 2017-10-11
 */
public class BasicActivity extends AppCompatActivity {
    private boolean isRegistered = false;
    private NetWorkChangReceiver netWorkChangReceiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //注册网络状态监听广播
        netWorkChangReceiver = new NetWorkChangReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
        filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
        filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
        registerReceiver(netWorkChangReceiver, filter);
        isRegistered = true;
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //解绑
        if (isRegistered) {
            unregisterReceiver(netWorkChangReceiver);
        }
    }
}

　(3) 在AndroidManifest.xml中声明广播以及对应的网络权限

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.guorentong.learn.wangluozhuangtai">

    <!-- 网络权限 -->
    <uses-permission android:name="android.permission.INTERNET"/>

    <!-- 网络状态 -->
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />



    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>


        <!--监听网络状态-->
        <receiver android:name=".NetWorkChangReceiver" >
            <intent-filter>
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
                <action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
                <action android:name="android.net.wifi.STATE_CHANGE" />
            </intent-filter>
        </receiver>
    </application>

</manifest>