判断网络状态



  添加权限 android.permission.ACCESS_NETWORK_STATE

public static boolean isConn(Context context){
        boolean bisConnFlag=false;
        //1.获取网络连接的管理对象
        ConnectivityManager conManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        //2.通过管理者对象拿到网络的信息
        NetworkInfo network = conManager.getActiveNetworkInfo();
        if(network!=null){
            //3.网络状态是否可用的返回值
            bisConnFlag=network.isAvailable();
        }
        return bisConnFlag;
    }

    /**
     * 如果没有网络 弹出dialog对话框,,,是否进入设置网络的页面
     * @param context
     */
    public static void showNoNetWorkDlg(final Context context) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setIcon(R.mipmap.ic_launcher)         //
                .setTitle("警告")            //
                .setMessage("当前无网络,是否去设置?").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("取消", null).show();
    }