Android设备是否连接网络

public static boolean checkNet(Context context) {

try {
ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null) {

NetworkInfo info = connectivity.getActiveNetworkInfo();
if (info != null && info.isConnected()) {

if (info.getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
} catch (Exception e) {
return false;
}
return false;
}

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* 检验网络连接 并toast提示
*
* @return
*/
public boolean note_Intent(Context context) {
ConnectivityManager con = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkinfo = con.getActiveNetworkInfo();
if (networkinfo == null || !networkinfo.isAvailable()) {
// 当前网络不可用
Toast.makeText(context.getApplicationContext(), "请先连接Internet！",
Toast.LENGTH_SHORT).show();
return false;
}
boolean wifi = con.getNetworkInfo(ConnectivityManager.TYPE_WIFI)
.isConnectedOrConnecting();
if (!wifi) { // 提示使用wifi
Toast.makeText(context.getApplicationContext(), "建议您使用WIFI以减少流量！",
Toast.LENGTH_SHORT).show();
}
return true;

}

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android中判断网络连接是否可用
 http://www.cnblogs.com/codeworker/archive/2012/04/23/2467180.html 一、判断网络连接是否可用

[java] view plaincopyprint?
public static boolean isNetworkAvailable(Context context) {
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (cm == null) {
} else {
　　　　　　　//如果仅仅是用来判断网络连接
　　　　　　  //则可以使用 cm.getActiveNetworkInfo().isAvailable();
NetworkInfo[] info = cm.getAllNetworkInfo();
if (info != null) {
for (int i = 0; i < info.length; i++) {
if (info.getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
}
return false;
}
二、判断GPS是否打开

[java] view plaincopyprint?
public static boolean isGpsEnabled(Context context) {
LocationManager lm = ((LocationManager) context
.getSystemService(Context.LOCATION_SERVICE));
List accessibleProviders = lm.getProviders(true);
return accessibleProviders != null && accessibleProviders.size() > 0;
}
三、判断WIFI是否打开

[java] view plaincopyprint?
public static boolean isWifiEnabled(Context context) {
ConnectivityManager mgrConn = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
TelephonyManager mgrTel = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
return ((mgrConn.getActiveNetworkInfo() != null && mgrConn
.getActiveNetworkInfo().getState() == NetworkInfo.State.CONNECTED) || mgrTel
.getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS);
}
四、判断是否是3G网络

[java] view plaincopyprint?
public static boolean is3rd(Context context) {
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkINfo = cm.getActiveNetworkInfo();
if (networkINfo != null
&& networkINfo.getType() == ConnectivityManager.TYPE_MOBILE) {
return true;
}
return false;
}

五、判断是wifi还是3g网络,用户的体现性在这里了，wifi就可以建议下载或者在线播放。

[java] view plaincopyprint?
public static boolean isWifi(Context context) {
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkINfo = cm.getActiveNetworkInfo();
if (networkINfo != null
&& networkINfo.getType() == ConnectivityManager.TYPE_WIFI) {
return true;
}
return false;
}  ```