Question

我正在尝试使用开关在约束布局中切换组的可见性。我在Android Studio“无法解析方法'setVisibility（int）'的setVisibility方法上遇到错误。”我可以弄清楚我错过了什么。

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CompoundButton;
import android.widget.Switch;

import java.security.acl.Group;

public class FragmentCO2Settings extends Fragment {

public static final String ARG_PAGE = "ARG_PAGE";

private int mPage;
private Group fractiongroup;
private Switch fractionswitch;

public static FragmentCO2Settings newInstance(int page) {
    Bundle args = new Bundle();
    args.putInt(ARG_PAGE, page);
    FragmentCO2Settings fragment = new FragmentCO2Settings();
    fragment.setArguments(args);
    return fragment;
}

public FragmentCO2Settings() {
}

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.co2extractor_settings_fragment, container, false);
    fractionswitch = (Switch) getView().findViewById(R.id.fractswitch);
    fractiongroup = (Group) getView().findViewById(R.id.Fractiongroup);
    fractionswitch.setChecked(true);
    fractionswitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if(isChecked){
                fractiongroup.setVisibility(View.VISIBLE);
            } else {
                fractiongroup.setVisibility(View.GONE);
            }
        }
    });
    return rootView;

    }
}

默认情况下，分数开关设置为检查，并且分数组设置为可见。我想设置它，以便当分数开关未被点击时，分数组将可见性改为GONE。

Answer 1

试试这个。

            if(isChecked){
                fractiongroup.setVisibility(ConstraintLayout.VISIBLE);
            } else {
                fractiongroup.setVisibility(ConstraintLayout.GONE);
            }

或者您也可以单独更改引用视图的可见性。

Answer 2

我发现了问题。当我应该使用ViewGroup类时，我正在使用Group类。改变了它并且它起作用了。

设置tablayout片段中组的可见性时遇到问题

2 个答案: