判断网络状态

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class NetUtil {

  //是否有可用的网络
  public static boolean hasNetwork(Context context) {
    ConnectivityManager cm =
        (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetworkInfo = cm.getActiveNetworkInfo();

    //有网络设备 且设备可用
    return activeNetworkInfo != null && activeNetworkInfo.isAvailable();
  }

  //判断是否是手机网络
  public static boolean isMobileNetwork(Context context) {
    //连接管理服务
    ConnectivityManager cm =
        (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

    //获取到当前默认可用网络信息
    NetworkInfo activeNetworkInfo = cm.getActiveNetworkInfo();

    //有网络设备 且 网络设备是手机网络
    return activeNetworkInfo.getType() == ConnectivityManager.TYPE_MOBILE;
  }
}

判断设置

if (!NetWorkUtils.isNetWork(this)) {
                    TextView msg = new TextView(this);
                    msg.setText("当前没有可以使用的网络，请设置网络！");
                    new AlertDialog.Builder(this)
                            .setIcon(R.drawable.ic_launcher_background)
                            .setTitle("网络状态提示")
                            .setView(msg)
                            .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                                 @Override
                                 public void onClick(DialogInterface dialog, int whichButton) {
                                    // 跳转到设置界面
                                     MovieActivity.this.startActivityForResult(new Intent(Settings.ACTION_WIRELESS_SETTINGS), 0);
                                 }
                            })
                            .create()
                            .show();