android开发如何判断当前的网络?是wifi还是4G呢?
我们在开发时,有时候某些场景需要判断网络情况。
比如说要下载文件时,提示用户是否在wifi连接情况下才下载。比如说在线看视频时,不是wifi模式我们要提示用户注意流量消耗。
判断网络连接状态
- 添加权限
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
获取网络连接状态
ConnectivityManager cm =
(ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean isConnected = activeNetwork != null &&
activeNetwork.isConnectedOrConnecting();
Log.d(TAG,"isConnected -- > " + isConnected);
这样子就可以拿到网络连接状态了
如果为true表示已经连接,false表示没有连接,也就是断网了。
判断网络类型
boolean isWiFi = activeNetwork.getType() == ConnectivityManager.TYPE_WIFI;
广播监听判断是2G,3G,4G网络类型
如果以 Android 7.0(API 级别 24)及更高版本为目标平台的应用在其清单中声明广播接收器,则它们不会收到 CONNECTIVITY_ACTION 广播。如果应用使用 Context.registerReceiver() 注册 BroadcastReceiver 且该上下文仍有效,则它们仍会收到 CONNECTIVITY_ACTION 广播。
所以还是通过动态注册来监听吧
注册广播,前面说了,不让静态注册,高版本。
IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
receiver = new NetworkReceiver();
this.registerReceiver(receiver, filter);
广播接受者
public class NetworkReceiver extends BroadcastReceiver {
private static final String TAG = "NetworkReceiver";
public static String strNetworkType = null;
@Override
public void onReceive(Context context,Intent intent) {
ConnectivityManager conn = (ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = conn.getActiveNetworkInfo();
if(networkInfo != null && networkInfo.isConnected()) {
if(networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
strNetworkType = "WIFI";
Log.d(TAG,"wifi...");
} else if(networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
String _strSubTypeName = networkInfo.getSubtypeName();
Log.d(TAG,"Network getSubtypeName : " + _strSubTypeName);
// TD-SCDMA networkType is 17
int networkType = networkInfo.getSubtype();
switch(networkType) {
case TelephonyManager.NETWORK_TYPE_GPRS:
case TelephonyManager.NETWORK_TYPE_EDGE:
case TelephonyManager.NETWORK_TYPE_CDMA:
case TelephonyManager.NETWORK_TYPE_1xRTT:
case TelephonyManager.NETWORK_TYPE_IDEN: //api<8 : replace by 11
strNetworkType = "2G";
break;
case TelephonyManager.NETWORK_TYPE_UMTS:
case TelephonyManager.NETWORK_TYPE_EVDO_0:
case TelephonyManager.NETWORK_TYPE_EVDO_A:
case TelephonyManager.NETWORK_TYPE_HSDPA:
case TelephonyManager.NETWORK_TYPE_HSUPA:
case TelephonyManager.NETWORK_TYPE_HSPA:
case TelephonyManager.NETWORK_TYPE_EVDO_B: //api<9 : replace by 14
case TelephonyManager.NETWORK_TYPE_EHRPD: //api<11 : replace by 12
case TelephonyManager.NETWORK_TYPE_HSPAP: //api<13 : replace by 15
strNetworkType = "3G";
break;
case TelephonyManager.NETWORK_TYPE_LTE: //api<11 : replace by 13
strNetworkType = "4G";
break;
default:
// http://baike.baidu.com/item/TD-SCDMA 中国移动 联通 电信 三种3G制式
if(_strSubTypeName.equalsIgnoreCase("TD-SCDMA") ||
_strSubTypeName.equalsIgnoreCase("WCDMA") ||
_strSubTypeName.equalsIgnoreCase("CDMA2000")) {
strNetworkType = "3G";
} else {
strNetworkType = _strSubTypeName;
}
break;
}
Log.d(TAG,"Network getSubtype : " + Integer.valueOf(networkType).toString());
}
Log.d(TAG,"网络类型 -- > " + strNetworkType);
}
}
}
以上网络类型判断来自民间博客
监听 结果
D/NetworkReceiver: wifi...
D/NetworkReceiver: 网络类型 -- > WIFI
D/NetworkReceiver: wifi...
D/NetworkReceiver: 网络类型 -- > WIFI
D/NetworkReceiver: Network getSubtypeName : LTE
D/NetworkReceiver: Network getSubtype : 13
D/NetworkReceiver: 网络类型 -- > 4G
okay,安卓api常见,知道就好,不需要记。必要的时候,或者遇到问题了,上官网去看看就好。