android判断是否有网络
‘壹’ Android检测是否有网络的代码
从程序开发的角度来开发该功能如下代码及代码中的注释即可理解：
ConnectivityManager manager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
// 检查网络连接，如果无网络可用，就不需要进行连网操作等
NetworkInfo info = manager.getActiveNetworkInfo();
if (info == null || !manager.getBackgroundDataSetting()) {
return "无网络链接";
}
return "网络畅通";
‘贰’ android 判断是否有网络连接
ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = connectivity.getActiveNetworkInfo();
if(info != null && info.isAvailable()){
if (netInfo.getType() == ConnectivityManager.TYPE_WIFI) {
//WiFi网络
} else if (netInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
//移动网络
} else {
//网络错误
}
}else{
//网络错误
}
‘叁’ Android中如何简单检测网络是否连接
权限：
<uses-permissionandroid:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permissionandroid:name="android.permission.INTERNET"/>
<uses-permissionandroid:name="android.permission.ACCESS_WIFI_STATE"/>
代码：
java">/*
*判断网络连接是否已开
*true已打开false未打开
**/
publicstaticbooleanisConn(Contextcontext){
booleanbisConnFlag=false;
ConnectivityManagerconManager=(ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfonetwork=conManager.getActiveNetworkInfo();
if(network!=null){
bisConnFlag=conManager.getActiveNetworkInfo().isAvailable();
}
returnbisConnFlag;
}
/*没有网络跳转到网络设置页面
*打开设置网络界面
**/
(finalContextcontext){
//提示对话框
AlertDialog.Builderbuilder=newAlertDialog.Builder(context);
builder.setTitle("网络设置提示").setMessage("网络连接不可用,是否进行设置?").setPositiveButton("设置",newDialogInterface.OnClickListener(){
@Override
publicvoidonClick(DialogInterfacedialog,intwhich){
//TODOAuto-generatedmethodstub
Intentintent=null;
//判断手机系统的版本即API大于10就是3.0或以上版本
if(Build.VERSION.SDK_INT>10){
intent=newIntent(Settings.ACTION_WIRELESS_SETTINGS);
}else{
intent=newIntent();
ComponentNamecomponent=newComponentName("com.android.settings","com.android.settings.WirelessSettings");
intent.setComponent(component);
intent.setAction("android.intent.action.VIEW");
}
context.startActivity(intent);
}
}).setNegativeButton("取消",newDialogInterface.OnClickListener(){
@Override
publicvoidonClick(DialogInterfacedialog,intwhich){
//TODOAuto-generatedmethodstub
dialog.dismiss();
}
}).show();
}
‘肆’ android怎么判断是否联网
面返false表示网络通 // 检测网络 public static boolean checkNetworkAvailable(Context context) { ConnectivityManager connectivity = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); if (connectivity == null) { return false; } else { NetworkInfo[] info = connectivity.getAllNetworkInfo(); if (info != null) { for (int i = 0; i < info.length; i++) { if (info[i].getState() == NetworkInfo.State.CONNECTED) { NetworkInfo netWorkInfo = info[i]; if (netWorkInfo.getType() == ConnectivityManager.TYPE_WIFI) { return true; } else if (netWorkInfo.getType() == ConnectivityManager.TYPE_MOBILE) { return true; } } } } } return false; }
‘伍’ android 判断当前是否有网络
NetworkInfo networkInfo = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE).getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected()){
//有网络以及网络类型
if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI){
//wifi
}else if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE){
//移动网络
}
} else {
//无网络
}
==希望能对你有用，望采纳
‘陆’ android 判断是不是有网络 方法 工具类里的几个常用方法
我都是自定义的网络工具类，大概是这样写的，希望能够帮到您：
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;
import android.widget.Toast;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
/**
* 网络工具类
*
* @author shikh
*
*/
public class NetUtils {
public static final int CMNET = 20;
public static final int CMWAP = 21;
public static final int WIFI = 22;
/**
* 获得网络类型:3G /WIFI
*/
public static int getAPNType(Context context) {
int netType = -1;
ConnectivityManager connMgr = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
if (networkInfo == null) {
return netType;
}
int nType = networkInfo.getType();
if (nType == ConnectivityManager.TYPE_MOBILE) {
Log.e("networkInfo.getExtraInfo()",
"networkInfo.getExtraInfo() is "
+ networkInfo.getExtraInfo());
if (networkInfo.getExtraInfo().toLowerCase().equals("cmnet")) {
netType = CMNET;
} else {
netType = CMWAP;
}
} else if (nType == ConnectivityManager.TYPE_WIFI) {
netType = WIFI;
}
return netType;
}
/**
* 获取Ip 地址
*
* @return
*/
public static String getLocalIpAddress() {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface
.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = intf
.getInetAddresses(); enumIpAddr.hasMoreElements();) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress()) {
return inetAddress.getHostAddress().toString();
}
}
}
} catch (SocketException ex) {
}
return null;
}
/**
* 判断网络状况
* @param context
* @return
*/
public static boolean isCheckNetAvailable(Context context) {
boolean isCheckNet = false;
try {
final ConnectivityManager connectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo mobNetInfoActivity = connectivityManager
.getActiveNetworkInfo();
if (mobNetInfoActivity == null || !mobNetInfoActivity.isAvailable()) {
isCheckNet = false;
return isCheckNet;
} else {
isCheckNet = true;
return isCheckNet;
}
} catch (Exception ex) {
ex.printStackTrace();
}
return isCheckNet;
}
public static boolean isCheckNetAvailable(Context context, int netType) {
boolean isAvaliable = false;
ConnectivityManager manager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = manager.getNetworkInfo(netType);
if (null != info && info.isConnected()) {
isAvaliable = true;
}else{
Toast.makeText(context, R.string.net_wrok_unconnetion_text, Toast.LENGTH_SHORT).show();
}
return isAvaliable;
}
/**
* 判断网络是否可用
* @param context 上下文对象
* @return 可用返回true 不可用返回false
*/
public static boolean NetAvailable(Context context) {
if (!NetUtils.isCheckNetAvailable(context)) {
StringUtils.showToast(context, R.string.net_wrok_unconnetion_text);
return false;
}
return true;
}
}
‘柒’ Android系列之如何判断网络链接状态
获取android系统的连接服务可判断网络连接状态，代码如下
publicclassNetUtils{
(Contextcontext){
=(ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo[]infos=cm.getAllNetworkInfo();
for(NetworkInfoinfo:infos){
if(info.isAvailable()&&info.isConnected()){
returntrue;
}
}
returnfalse;
}
}NetworkInfo的isAvailable()和isConnected()有以下5种状态：
在WLAN设置界面
1，显示连接已保存，但标题栏没有，即没有实质连接上：isConnected()==false,isAvailable()=true
2，显示连接已保存，标题栏也有已连接上的图标：isConnected()==true,isAvailable()=true
3，选择不保存后：isConnected()==false,isAvailable()=true
4，选择连接，在正在获取IP地址时：isConnected()==false,isAvailable()=false
5，连接上后：isConnected()==true,isAvailable()=true
‘捌’ android 如何判断网络是否能够上网
实现步骤：
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1、获取ConnectivityManager对象
Context context = activity.getApplicationContext();
// 获取手机所有连接管理对象（包括对wi-fi,net等连接的管理）
ConnectivityManager connectivityManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
2、获取NetworkInfo对象
// 获取NetworkInfo对象
NetworkInfo[] networkInfo = connectivityManager.getAllNetworkInfo();
3、判断当前网络状态是否为连接状态
if (networkInfo[i].getState() == NetworkInfo.State.CONNECTED)
{
return true;
}
4、在AndroidManifest.xml中添加访问当前网络状态权限
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
代码如下：
public class ClassTestDemoActivity extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (isNetworkAvailable(ClassTestDemoActivity.this))
{
Toast.makeText(getApplicationContext(), "当前有可用网络！", Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(getApplicationContext(), "当前没有可用网络！", Toast.LENGTH_LONG).show();
}
}
/**
* 检查当前网络是否可用
*
* @param context
* @return
*/
public boolean isNetworkAvailable(Activity activity)
{
Context context = activity.getApplicationContext();
// 获取手机所有连接管理对象（包括对wi-fi,net等连接的管理）
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivityManager == null)
{
return false;
}
else
{
// 获取NetworkInfo对象
NetworkInfo[] networkInfo = connectivityManager.getAllNetworkInfo();
if (networkInfo != null && networkInfo.length > 0)
{
for (int i = 0; i < networkInfo.length; i++)
{
System.out.println(i + "===状态===" + networkInfo[i].getState());
System.out.println(i + "===类型===" + networkInfo[i].getTypeName());
// 判断当前网络状态是否为连接状态
if (networkInfo[i].getState() == NetworkInfo.State.CONNECTED)
{
return true;
}
}
}
}
return false;
}
}
‘玖’ android 怎么判断网络状态
获取android系统的连接服务可判断网络连接状态，代码如下
public class NetUtils{
public static boolean isNetworkConnected(Context context){
ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo[] infos = cm.getAllNetworkInfo();
for(NetworkInfo info:infos){
if(info.isAvailable()&&info.isConnected()){
return true;
}
}
return false;
}
}
NetworkInfo的isAvailable()和isConnected()有以下5种状态：
在WLAN设置界面
1，显示连接已保存，但标题栏没有，即没有实质连接上：isConnected()==false,isAvailable()=true
2，显示连接已保存，标题栏也有已连接上的图标：isConnected()==true,isAvailable()=true
3，选择不保存后：isConnected()==false,isAvailable()=true
4，选择连接，在正在获取IP地址时：isConnected()==false,isAvailable()=false
5，连接上后：isConnected()==true,isAvailable()=true
‘拾’ 如何判断android手机当前是否联网
下面的方法返回false表示网络不通
// 检测网络
public static boolean checkNetworkAvailable(Context context) {
ConnectivityManager connectivity = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity == null) {
return false;
} else {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null) {
for (int i = 0; i < info.length; i++) {
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
NetworkInfo netWorkInfo = info[i];
if (netWorkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
return true;
} else if (netWorkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
return true;
}
}
}
}
}
return false;
}