Android中判断网络是否连接并提示设置

/**
* 判断网络是否连通
* @param context
* @return
*/
public static boolean isNetworkConnected(Context context){
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
NetworkInfo info = cm.getActiveNetworkInfo();
return info != null && info.isConnected();
}

//如果网络连接
if(Util.isNetworkConnected(context)){
mMainFrameTask = new MainFrameTask();
mMainFrameTask.execute();
}else{
AlertDialog.Builder builder = new Builder(context);
builder.setTitle("设置网络");
builder.setMessage("网络错误，请设置网络");

builder.setPositiveButton("设置网络",new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
//获取系统版本号
/* Build.VERSION_CODES
1 (0x00000001)           Android 1.0             BASE
2 (0x00000002)           Android 1.1             BASE_1_1
3 (0x00000003)           Android 1.5             CUPCAKE
4 (0x00000004)           Android 1.6             DONUT
5 (0x00000005)           Android 2.0             ECLAIR
6 (0x00000006)           Android 2.0.1          ECLAIR_0_1
7 (0x00000007)           Android 2.1             ECLAIR_MR1
8 (0x00000008)           Android 2.2             FROYO
9 (0x00000009)           Android 2.3             GINGERBREAD
10 (0x0000000a)         Android 2.3.3          GINGERBREAD_MR1
11 (0x0000000b)         Android 3.0             HONEYCOMB
12 (0x0000000c)         Android 3.1             HONEYCOMB_MR1
13 (0x0000000d)         Android 3.2             HONEYCOMB_MR2 */
int currentapiVersion=android.os.Build.VERSION.SDK_INT;
System.out.println("currentapiVersion = " + currentapiVersion);
Intent intent;
if(currentapiVersion < 11){
intent = new Intent();
intent.setClassName("com.android.settings", "com.android.settings.WirelessSettings");
}else{
//3.0以后
//intent = new Intent( android.provider.Settings.ACTION_WIRELESS_SETTINGS);
intent = new Intent( android.provider.Settings.ACTION_SETTINGS);
}
context.startActivity(intent);
}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {

}
});
builder.create().show();
}
}