android判断网络连接状态

/**
* 检测网络状态
* http://www.cnblogs.com/qingblog/archive/2012/07/19/2598983.html * @return
*/
public boolean hasIntener() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = cm.getActiveNetworkInfo();
if(networkInfo != null) {
return networkInfo.isAvailable();
}
return false;
}

/**
* 检测wifi状态
* @return
*/
public boolean checkWifi() {
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
if(networkInfo != null) {
return networkInfo.isAvailable();
}
return false;
}

/**
* 检测GPRS连接是否可用
* @return
*/
public boolean checkMobile() {
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if(networkInfo != null) {
return networkInfo.isAvailable();
}
return false;
}

/**
* 获取当前的网络状态 -1：没有网络 1：WIFI网络2：wap网络3：net网络
* @return
*/
public int getNetworkType() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = cm.getActiveNetworkInfo();
if(networkInfo != null && networkInfo.isAvailable()) {
if(networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
return NET_WIFI;
}else {
switch (networkInfo.getSubtype()) {
case TelephonyManager.NETWORK_TYPE_CDMA:
case TelephonyManager.NETWORK_TYPE_GPRS:
case TelephonyManager.NETWORK_TYPE_EDGE:
case TelephonyManager.NETWORK_TYPE_1xRTT:
case TelephonyManager.NETWORK_TYPE_IDEN:
NetType = NET_2G;
break;
case TelephonyManager.NETWORK_TYPE_UMTS:
case TelephonyManager.NETWORK_TYPE_HSDPA:
case TelephonyManager.NETWORK_TYPE_EVDO_0:
case TelephonyManager.NETWORK_TYPE_EVDO_A:
case TelephonyManager.NETWORK_TYPE_EVDO_B:
case TelephonyManager.NETWORK_TYPE_HSPA:
case TelephonyManager.NETWORK_TYPE_EHRPD:
case TelephonyManager.NETWORK_TYPE_HSPAP:
case TelephonyManager.NETWORK_TYPE_LTE:
NetType = NET_3G;
break;
case TelephonyManager.NETWORK_TYPE_UNKNOWN:
default:
NetType = NET_2G;
break;
}
}
return NetType;
}
return -1;
}

/**
* 设置网络
* @param context
*/
public void setNet(final Context context) {
//提示对话框
AlertDialog.Builder builder=new AlertDialog.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", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Intent intent=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(android.os.Build.VERSION.SDK_INT>10){
intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);
}else{
intent = new Intent();
ComponentName component = new ComponentName("com.android.settings","com.android.settings.WirelessSettings");
intent.setComponent(component);
intent.setAction("android.intent.action.VIEW");
}
context.startActivity(intent);
}
}).setNegativeButton("取消", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
}).show();
}