Android之判断是否有网封装类

            Android之判断是否有网封装类

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.widget.Toast;

public class NetState {

public final static int CONNECTION_NO      = 0; //无网络连接
public static final int CONNECTION_HOME    = 1;//内网中wifi
public final static int CONNECTION_OUTSIDE = 2;//外网中wifi或使用移动数据
//检查网络状态
public static int checkState(Context context){
int state = CONNECTION_NO;
ConnectivityManager connectivityManager= (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
if(connectivityManager!=null){
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if(networkInfo!=null&&networkInfo.isAvailable()&&networkInfo.isConnected()){
if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
WifiManager wifiManager =(WifiManager)context.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
//					wifiInfo.getBSSID().equals(wifiMac);
state = CONNECTION_HOME;
}else {
state =CONNECTION_OUTSIDE;
}
}
}
return state;
}

/**
* 判断是否有网络
*/
@SuppressWarnings("deprecation")
public static boolean IfNet(Context context){
switch (NetState.checkState(context)) {
case NetState.CONNECTION_NO:
Toast.makeText(context, "网络断了哦,检查一下您的网络吧", Toast.LENGTH_SHORT).show();
return true;
default:
break;
}
return false;
}

public static String getLocalMacAddress(Context context) {
WifiManager wifi = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
WifiInfo info = wifi.getConnectionInfo();
return info.getMacAddress();
}

public static boolean isWifi(Context context) {
try {
WifiManager wm = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
return (wm!=null && WifiManager.WIFI_STATE_ENABLED == wm.getWifiState());
} catch (Exception e) {
}
return false;
}
}

public class NetworkDetector {

public static boolean detect(Activity act) {

ConnectivityManager manager = (ConnectivityManager) act
.getApplicationContext().getSystemService(
Context.CONNECTIVITY_SERVICE);

if (manager == null) {
return false;
}

NetworkInfo networkinfo = manager.getActiveNetworkInfo();

if (networkinfo == null || !networkinfo.isAvailable()) {
return false;
}

return true;
}
}

这个类只有一个静态方法，用来检测当前系统的网络是否可用。如果可用，返回true。
还要进一步说明的是，NetworkInfo类中有一个方法getType()，这个方法可以用来判断当前可用的网络是wifi，还是mobile等等。

再来看使用的例子。

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boolean networkState = NetworkDetector.detect(XXXActivity.this);
if (!networkState) {
DialogUtil.openMsgDialog(XXXActivity.this,
android.R.drawable.ic_dialog_info,
“网络不可用，是否现在设置网络？”, android.R.string.ok,
android.R.string.cancel,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
startActivityForResult(new Intent(
ACTION_WIRELESS_SETTINGS), 0);
}
}, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
}).show();
}
boolean networkState = NetworkDetector.detect(XXXActivity.this);
if (!networkState) {
DialogUtil.openMsgDialog(XXXActivity.this,
android.R.drawable.ic_dialog_info,
“网络不可用，是否现在设置网络？”, android.R.string.ok,
android.R.string.cancel,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
startActivityForResult(new Intent(
ACTION_WIRELESS_SETTINGS), 0);
}
}, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
}).show();
}