Android检测网络状态监听网络变化

网络状态改变、用户信息改变（帐户的钱），第一时间就要想到用观察者模式来实现

广播接收者，简单地把网络的变化通过接口抛出去

package com.qkt.face.et.receiver;import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.util.Log;import com.qkt.face.et.MyApplication;
import com.qkt.face.et.enums.NetworkType;
import com.qkt.face.et.utils.NetworkUtil;import java.util.ArrayList;
import java.util.List;public class NetStateChangeReceiver extends BroadcastReceiver {private static class InstanceHolder {private static final NetStateChangeReceiver INSTANCE = new NetStateChangeReceiver();}private List<NetStateChangeObserver> mObservers = new ArrayList<>();@Overridepublic void onReceive(Context context, Intent intent) {if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {NetworkType networkType = NetworkUtil.getNetworkType(context);Log.i("NetStateChangeReceiver", networkType.toString());notifyObservers(networkType);}}public static void registerReceiver(Context context) {IntentFilter intentFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);context.registerReceiver(InstanceHolder.INSTANCE, intentFilter);}public static void unRegisterReceiver(Context context) {context.unregisterReceiver(InstanceHolder.INSTANCE);}public static void registerObserver(NetStateChangeObserver observer) {if (observer == null) {return;}if (!InstanceHolder.INSTANCE.mObservers.contains(observer)) {InstanceHolder.INSTANCE.mObservers.add(observer);}}public static void unRegisterObserver(NetStateChangeObserver observer) {if (observer == null) {return;}if (InstanceHolder.INSTANCE.mObservers == null) {return;}InstanceHolder.INSTANCE.mObservers.remove(observer);}private void notifyObservers(NetworkType networkType) {if (networkType == NetworkType.NETWORK_NO) {for (NetStateChangeObserver observer : mObservers) {observer.onNetDisconnected();}} else {for (NetStateChangeObserver observer : mObservers) {observer.onNetConnected(networkType);}}}
}

public enum  NetworkType {NETWORK_WIFI("WiFi"),NETWORK_4G("4G"),NETWORK_2G("2G"),NETWORK_3G("3G"),NETWORK_UNKNOWN("Unknown"),NETWORK_NO("No network");private String desc;NetworkType(String desc) {this.desc = desc;}@Overridepublic String toString() {return desc;}
}

在需要的地方监听网络状态变化(记得销毁时删除监听器)，一般在BaseActivity

public class BaseActivity extends AppCompatActivity implements NetStateChangeObserver {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);NetStateChangeReceiver.registerObserver(this);registerReceiver();}@Overrideprotected void onDestroy() {super.onDestroy();NetStateChangeReceiver.unRegisterObserver(this);unregisterReceiver();}@Overridepublic void onNetDisconnected() {ivNet.setImageResource(R.drawable.netError);}//设置网络图标@Overridepublic void onNetConnected(NetworkType networkType) {if (networkType.equals(NetworkType.NETWORK_WIFI) ) {getWifi();} else {ivNet.setImageResource(R.drawable.net_eth);}}//获取wifi信号强度private void getWifi() {//x心跳包请求成功，获取真实网速，请求失败，网络错误WifiManager wifi_service = (WifiManager) getContext().getApplicationContext().getSystemService(WIFI_SERVICE);WifiInfo wifiInfo = wifi_service.getConnectionInfo();int wStrength = Math.abs(wifiInfo.getRssi());if (wStrength < 50) {ivNet.setImageResource(R.drawable.net4);} else if (49 < wStrength && wStrength < 100) {ivNet.setImageResource(R.drawable.net3);} else if (100 < wStrength) {ivNet.setImageResource(R.drawable.net2);}}}

public class NetworkUtil {private NetworkUtil() {throw new UnsupportedOperationException("u can't instantiate me...");}@RequiresPermission("android.permission.ACCESS_NETWORK_STATE")private static NetworkInfo getActiveNetworkInfo(Context context) {ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);return cm.getActiveNetworkInfo();}/*** 获取当前网络类型* 需添加权限 {@code <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>}*/@RequiresPermission("android.permission.ACCESS_NETWORK_STATE")public static NetworkType getNetworkType(Context context) {NetworkType netType = NetworkType.NETWORK_NO;NetworkInfo info = getActiveNetworkInfo(context);if (info != null && info.isAvailable()) {if (info.getType() == ConnectivityManager.TYPE_WIFI) {netType = NetworkType.NETWORK_WIFI;} else if (info.getType() == ConnectivityManager.TYPE_MOBILE) {switch (info.getSubtype()) {case TelephonyManager.NETWORK_TYPE_TD_SCDMA:case TelephonyManager.NETWORK_TYPE_EVDO_A:case TelephonyManager.NETWORK_TYPE_UMTS:case TelephonyManager.NETWORK_TYPE_EVDO_0:case TelephonyManager.NETWORK_TYPE_HSDPA:case TelephonyManager.NETWORK_TYPE_HSUPA:case TelephonyManager.NETWORK_TYPE_HSPA:case TelephonyManager.NETWORK_TYPE_EVDO_B:case TelephonyManager.NETWORK_TYPE_EHRPD:case TelephonyManager.NETWORK_TYPE_HSPAP:netType = NetworkType.NETWORK_3G;break;case TelephonyManager.NETWORK_TYPE_LTE:case TelephonyManager.NETWORK_TYPE_IWLAN:netType = NetworkType.NETWORK_4G;break;case TelephonyManager.NETWORK_TYPE_GSM:case TelephonyManager.NETWORK_TYPE_GPRS:case TelephonyManager.NETWORK_TYPE_CDMA:case TelephonyManager.NETWORK_TYPE_EDGE:case TelephonyManager.NETWORK_TYPE_1xRTT:case TelephonyManager.NETWORK_TYPE_IDEN:netType = NetworkType.NETWORK_2G;break;default:String subtypeName = info.getSubtypeName();if (subtypeName.equalsIgnoreCase("TD-SCDMA")|| subtypeName.equalsIgnoreCase("WCDMA")|| subtypeName.equalsIgnoreCase("CDMA2000")) {netType = NetworkType.NETWORK_3G;} else {netType = NetworkType.NETWORK_UNKNOWN;}break;}} else {netType = NetworkType.NETWORK_UNKNOWN;}}return netType;}
}

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