android网络连接的判断

1.网络连接是通过广播进行发送的

package ysl.netdemo;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.text.TextUtils;
import android.util.Log;public class NetWorkBroadcastReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {if (ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())) {// 监听网络连接状态变化Log.i("ysl","NetWorkBroadcastReceiver onReceive CONNECTIVITY_ACTION");String oldNetType = LetvBaseWebViewActivity.netType;String currentNetType = NetWorkTypeUtils.getNetTypeForWebView(context);String telecomOperators = NetWorkTypeUtils.getTelecomOperators(context);if (TextUtils.isEmpty(oldNetType)) {Log.i("ysl", "oldNetType为空！BaseWebView初始化有问题！");} else if (!oldNetType.equalsIgnoreCase(currentNetType)) {HashMap<String, Object> netMap = new HashMap<String, Object>();netMap.put("pre", oldNetType);netMap.put("now", currentNetType);Log.i("ysl", oldNetType+"-----------------"+currentNetType+"_________"+telecomOperators);netMap.put("result", 200);notifyAllObservers(netMap);LetvBaseWebViewActivity.netType = currentNetType;}else if (oldNetType.equalsIgnoreCase(currentNetType)) {Log.i("ysl", oldNetType+"=========="+currentNetType+"_________"+telecomOperators);}}}public interface NetWorkChangeObserver {void onNetTypeChange(HashMap<String, Object> netMap);}private static List<NetWorkChangeObserver> netWorkChangeObservers = new ArrayList<NetWorkChangeObserver>();public synchronized static void registerObserver(NetWorkChangeObserver observer) {if (!netWorkChangeObservers.contains(observer)) {netWorkChangeObservers.add(observer);}}public synchronized static void unRegisterObserver(NetWorkChangeObserver observer) {if (netWorkChangeObservers.contains(observer)) {netWorkChangeObservers.remove(observer);}}public void notifyAllObservers(HashMap<String, Object> netMap) {for (NetWorkChangeObserver observer : netWorkChangeObservers) {observer.onNetTypeChange(netMap);}}
}

2.注册广播接受者，就可以使用

NetWorkBroadcastReceiver receiver = new NetWorkBroadcastReceiver();IntentFilter filter = new IntentFilter();filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");registerReceiver(receiver, filter);

3.这有一个判断网络的工具类，可直接使用

package ysl.netdemo;import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.telephony.TelephonyManager;
import android.text.TextUtils;public class NetWorkTypeUtils {private static final int NETTYPE_WIFI = 5;private static final int NETTYPE_2G = 2;private static final int NETTYPE_3G = 3;private static final int NETTYPE_4G = 4;private static final int NETTYPE_UNKOWN = 0;private static final int NETTYPE_NO = 1;private static final String China_Mobile = "中国移动";private static final String China_Unicom = "中国联通";private static final String China_Telecom = "中国电信";private static final String China_Unkown = "不知道";private static ConnectivityManager connectivityManager;private static NetworkInfo networkInfo;public static String getNetTypeForWebView(Context context) {String type = "unknown";int netGeneration = NetWorkTypeUtils.getNetGeneration(context);switch (netGeneration) {case NetWorkTypeUtils.NETTYPE_WIFI:type = "wifi";break;case NetWorkTypeUtils.NETTYPE_2G:type = "2G";break;case NetWorkTypeUtils.NETTYPE_3G:type = "3G";break;case NetWorkTypeUtils.NETTYPE_4G:type = "4G";break;case NetWorkTypeUtils.NETTYPE_UNKOWN:type = "unknown";break;case NetWorkTypeUtils.NETTYPE_NO:type = "none";break;}return type;}private static int getNetGeneration(Context context) {connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);networkInfo = connectivityManager.getActiveNetworkInfo();if (networkInfo != null && networkInfo.isAvailable()) {String typeName = networkInfo.getTypeName();if ("WIFI".equalsIgnoreCase(typeName)) {return NETTYPE_WIFI;} else if ("MOBILE".equalsIgnoreCase(typeName)) {TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);switch (telephonyManager.getNetworkType()) {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:return NETTYPE_2G;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:case TelephonyManager.NETWORK_TYPE_EHRPD:case TelephonyManager.NETWORK_TYPE_HSPAP:return NETTYPE_3G;case TelephonyManager.NETWORK_TYPE_LTE:return NETTYPE_4G;case TelephonyManager.NETWORK_TYPE_UNKNOWN:return NETTYPE_UNKOWN;default:return NETTYPE_UNKOWN;}}} else {return NETTYPE_NO;}return -1;}/*** 判断为哪个运营商*/public static String getTelecomOperators(Context context) {ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();String imsi = "";if (networkInfo != null && networkInfo.isAvailable()) {TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);imsi = telephonyManager.getSubscriberId();}if (!TextUtils.isEmpty(imsi)) {if (imsi.startsWith("46000") || imsi.startsWith("46002")) {return China_Mobile;} else if (imsi.startsWith("46001")) {return China_Unicom;} else if (imsi.startsWith("46003")) {return China_Telecom;}}return China_Unkown;}}

4.判断当前手机的信号强度

4.1 wifi变化的广播接收者

public class WifiChangeBroadcastReceiver extends BroadcastReceiver{private Context mContext;private TextView myText8;  public WifiChangeBroadcastReceiver(TextView myText8) {this.myText8 = myText8;}@Overridepublic void onReceive(Context context, Intent intent) {  mContext=context;  System.out.println("Wifi发生变化");  getWifiInfo();  }  private void getWifiInfo() {  WifiManager wifiManager = (WifiManager) mContext.getSystemService(mContext.WIFI_SERVICE);  WifiInfo wifiInfo = wifiManager.getConnectionInfo();  if (wifiInfo.getBSSID() != null) {  //wifi名称  String ssid = wifiInfo.getSSID();  //wifi信号强度  int level = WifiManager.calculateSignalLevel(wifiInfo.getRssi(), 5);  //wifi速度  int speed = wifiInfo.getLinkSpeed();  //wifi速度单位  String units = WifiInfo.LINK_SPEED_UNITS;  myText8.setText("Wifi发生变化"+"\n"+"ssid="+ssid+",level="+level+",speed="+speed+",units="+units);System.out.println("ssid="+ssid+",level="+level+",speed="+speed+",units="+units);  }  }
}

4.2 信号强度的各种信息

package zz.xinhaoqiangdu;import java.util.List;import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.os.Handler;
import android.telephony.PhoneStateListener;
import android.telephony.SignalStrength;
import android.telephony.TelephonyManager;
import android.widget.TextView;
import android.widget.Toast;public class MainActivity extends Activity { //TelephonyManager类的对象  private TelephonyManager Tel;  //MyPhoneStateListener类的对象，即设置一个监听器对象  private MyPhoneStateListener MyListener;private BroadcastReceiver receiver;private TextView myText8;private IntentFilter filter;  @Override  public void onCreate(Bundle savedInstanceState) {  //SignalStrength signalStrength;  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  myText8 = (TextView)findViewById(R.id.myText8); //初始化对象  MyListener = new MyPhoneStateListener();  //通过名字获得一个系统级服务  Tel = ( TelephonyManager )getSystemService(Context.TELEPHONY_SERVICE);  //设置监听器监听特定事件的状态  Tel.listen(MyListener ,PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);  receiver = new WifiChangeBroadcastReceiver();filter = new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION);registerReceiver(receiver, filter);}  @Override  protected void onPause() {  super.onPause();  Tel.listen(MyListener, PhoneStateListener.LISTEN_NONE);  }  @Override  protected void onResume() {  super.onResume();  Tel.listen(MyListener,PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);  registerReceiver(receiver, filter);}  //监听器类  private class MyPhoneStateListener extends PhoneStateListener{  /*得到信号的强度由每个tiome供应商,有更新*/  TextView myText = (TextView)findViewById(R.id.myText);  TextView myText1=(TextView)findViewById(R.id.myText1);  TextView myText2=(TextView)findViewById(R.id.myText2);  TextView myText3=(TextView)findViewById(R.id.myText3);  TextView myText4=(TextView)findViewById(R.id.myText4);  TextView myText5=(TextView)findViewById(R.id.myText5);  TextView myText6=(TextView)findViewById(R.id.myText6);  TextView myText7=(TextView)findViewById(R.id.myText7);  @Override  public void onSignalStrengthsChanged(SignalStrength signalStrength){  //调用超类的该方法，在网络信号变化时得到回答信号  super.onSignalStrengthsChanged(signalStrength);  //cinr：Carrier to Interference plus Noise Ratio（载波与干扰和噪声比）  //Toast.makeText(getApplicationContext(), "Go to Firstdroid!!! GSM Cinr = "+ String.valueOf(signalStrength.getGsmSignalStrength()), Toast.LENGTH_SHORT).show();  int level = signalStrength.getLevel();int cdmaDbm = signalStrength.getCdmaDbm();int CdmaEcio = signalStrength.getCdmaEcio();int EvdoDbm = signalStrength.getEvdoDbm();int EvdoEcio = signalStrength.getEvdoEcio();int EvdoSnr = signalStrength.getEvdoSnr();int GsmBitErrorRate = signalStrength.getGsmBitErrorRate();int GsmSignalStrength = signalStrength.getGsmSignalStrength();myText.setText("level = "+ level);  //信号格数myText1.setText("cdmaDbm  = "+ cdmaDbm);  myText2.setText("CdmaEcio = "+ CdmaEcio);  myText3.setText("EvdoDbm = "+ EvdoDbm);  myText4.setText("EvdoEcio = "+ EvdoEcio);  myText5.setText("EvdoSnr = "+ EvdoSnr);  myText6.setText("GsmBitErrorRate = "+ GsmBitErrorRate);  myText7.setText("GsmSignalStrength = "+ GsmSignalStrength);//信号强度  }  } private class WifiChangeBroadcastReceiver extends BroadcastReceiver{@Overridepublic void onReceive(Context context, Intent intent) {  System.out.println("Wifi发生变化");  WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);  WifiInfo wifiInfo = wifiManager.getConnectionInfo();  if (wifiInfo.getBSSID() != null) {  //wifi名称  final String ssid = wifiInfo.getSSID();  //wifi信号强度  final int level = WifiManager.calculateSignalLevel(wifiInfo.getRssi(), 5);  //wifi速度  final int speed = wifiInfo.getLinkSpeed();  //wifi速度单位  final String units = WifiInfo.LINK_SPEED_UNITS;  myText8.setText("Wifi发生变化"+"\n"+"ssid="+ssid+",level="+level+",speed="+speed+",units="+units);System.out.println("ssid="+ssid+",level="+level+",speed="+speed+",units="+units);  }   }  }@Overrideprotected void onDestroy() {unregisterReceiver(receiver);super.onDestroy();}}

xml文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context="zz.xinhaoqiangdu.MainActivity" ><TextViewandroid:id="@+id/myText"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/hello_world" /><TextViewandroid:id="@+id/myText1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/hello_world" /><TextViewandroid:id="@+id/myText2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/hello_world" /><TextViewandroid:id="@+id/myText3"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/hello_world" /><TextViewandroid:id="@+id/myText4"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/hello_world" /><TextViewandroid:id="@+id/myText5"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/hello_world" /><TextViewandroid:id="@+id/myText6"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/hello_world" /><TextViewandroid:id="@+id/myText7"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/hello_world" /><TextViewandroid:id="@+id/myText8"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="50dip"android:text="监听wifi变化并获得当前信号强度" /></LinearLayout>

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