简单的网络判断

public class NetStateUtil {

/*
* 判断网络连接是否已开
 * true 已打开  false 未打开
 * */
public static boolean isConn(Context context){
    boolean bisConnFlag=false;
    ConnectivityManager conManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo network = conManager.getActiveNetworkInfo();
    if(network!=null){
        bisConnFlag=conManager.getActiveNetworkInfo().isAvailable();
    }
    return bisConnFlag;
}

/**
 * 当判断当前手机没有网络时选择是否打开网络设置
 * @param context
 */
public static void showNoNetWorkDlg(final Context context) {
    AlertDialog.Builder builder = new AlertDialog.Builder(context);
    builder.setIcon(R.mipmap.ic_launcher)         //
            .setTitle(R.string.app_name)            //
            .setMessage("当前无网络").setPositiveButton("设置", new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {
            // 跳转到系统的网络设置界面
            Intent intent = null;
            // 先判断当前系统版本
            if(android.os.Build.VERSION.SDK_INT > 10){  // 3.0以上
                intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);
            }else{
                intent = new Intent();
                intent.setClassName("com.android.settings", "com.android.settings.WirelessSettings");
            }
            context.startActivity(intent);

        }
    }).setNegativeButton("知道了", null).show();
}
}



//读取网络权限
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>