android 网络判断

转自

package mark.zhang;import java.util.List;import android.content.Context;import android.location.LocationManager;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.telephony.TelephonyManager;public class NetworkProber {/** * 网络是否可用 *  * @param activity * @return */public static boolean isNetworkAvailable(Context context) {ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);if (connectivity == null) {} else {NetworkInfo[] info = connectivity.getAllNetworkInfo();if (info != null) {for (int i = 0; i < info.length; i++) {if (info[i].getState() == NetworkInfo.State.CONNECTED) {return true;}}}}return false;}/** * Gps是否打开 *  * @param context * @return */public static boolean isGpsEnabled(Context context) {LocationManager locationManager = ((LocationManager) context.getSystemService(Context.LOCATION_SERVICE));List<String> accessibleProviders = locationManager.getProviders(true);return accessibleProviders != null && accessibleProviders.size() > 0;}/** * wifi是否打开 */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);}/** * 判断当前网络是否是wifi网络 * if(activeNetInfo.getType()==ConnectivityManager.TYPE_MOBILE) { //判断3G网 *  * @param context * @return boolean */public static boolean isWifi(Context context) {ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();if (activeNetInfo != null&& activeNetInfo.getType() == ConnectivityManager.TYPE_WIFI) {return true;}return false;}/** * 判断当前网络是否是3G网络 *  * @param context * @return boolean */public static boolean is3G(Context context) {ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();if (activeNetInfo != null&& activeNetInfo.getType() == ConnectivityManager.TYPE_MOBILE) {return true;}return false;}}

另外还有两个方法判断网络是否可用：

public static boolean isNetworkAvailable_00(Context context) {  ConnectivityManager cm = ((ConnectivityManager) context  .getSystemService(Context.CONNECTIVITY_SERVICE));  if (cm != null) {  NetworkInfo info = cm.getActiveNetworkInfo();  if (info != null && info.isConnectedOrConnecting()) {  return true;  }  }  return false;  }    public static boolean isNetworkAvailable_01(Context context) {  ConnectivityManager cm = (ConnectivityManager) context  .getSystemService(Context.CONNECTIVITY_SERVICE);  NetworkInfo network = cm.getActiveNetworkInfo();  if (network != null) {  return network.isAvailable();  }  return false;  }  

更加严谨的写法：

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;  }