片段中的单选按钮 findViewById

Question

为了让 findViewById 在我的 Fragment 中工作，我环顾四周并实施了一些我发现的东西。但是，我要么无法解析方法 findViewById，要么得到 "Unreachable Statement." 我不完全确定哪里出错了。

这是我的片段的代码。

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

/**
 * Created by James Singleton on 8/8/2016.
 */

public class SettingsFragment extends Fragment
{
    View myView;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        myView = inflater.inflate(R.layout.settings_layout, container, false);
        return myView;

        RadioGroup radioGroup = (RadioGroup) getView().findViewById(R.id.radioGroup);

        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()
        {
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                // checkedId is the RadioButton selected

                switch(checkedId) {
                    case R.id.radioButton7:
                        // switch to fragment 1
                        break;
                    case R.id.radioButton6:
                        // Fragment 2
                        break;
                }
            }
        });
    }
}

这是我的布局代码

<?xml version="1.0" encoding="utf-8"?>

<TextView
    android:text="Use Cell Data to retrieve driving data:"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/textView"
    android:textSize="18sp"
    android:textColor="@color/cast_expanded_controller_background_color"
    android:layout_alignParentTop="true"
    android:layout_alignParentStart="true" />

<RadioGroup
    android:layout_width="89dp"
    android:layout_height="69dp"
    android:weightSum="1"
    android:layout_below="@+id/textView"
    android:id="@+id/radioGroup">

    <RadioButton
        android:text="Enable"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/radioButton7"
        android:layout_weight="1" />

    <RadioButton
        android:text="Disable"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/radioButton6"
        android:layout_weight="1"
        android:checked="true" />
</RadioGroup>

Answer 1

在 onCreateView() 中返回一个视图之前，使用您膨胀的视图，如：

view.findViewById(R.id.your_id);

所以在你的情况下它会像：

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    myView = inflater.inflate(R.layout.settings_layout, container, false);

    RadioGroup radioGroup = (RadioGroup) myView.findViewById(R.id.radioGroup);

    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()
    {
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            // checkedId is the RadioButton selected

            switch(checkedId) {
                case R.id.radioButton7:
                    // switch to fragment 1
                    break;
                case R.id.radioButton6:
                    // Fragment 2
                    break;
            }
        }
    });
    return myView;
}

Answer 2

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.settings_layout, container, false);
    RadioGroup radioGroup = (RadioGroup) view.findViewById(R.id.radioGroup);
    return myView;
    }

Answer 3

像这样更改您的代码：

@Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        myView = inflater.inflate(R.layout.settings_layout, container, false);


        RadioGroup radioGroup = (RadioGroup) myView .findViewById(R.id.radioGroup);

        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()
        {
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                // checkedId is the RadioButton selected

                switch(checkedId) {
                    case R.id.radioButton7:
                        // switch to fragment 1
                        break;
                    case R.id.radioButton6:
                        // Fragment 2
                        break;
                }
            }
        });

        return myView;
    }

片段中的单选按钮 findViewById

Radio Button findViewById within a Fragment

android

radio-group

radio-button

android-fragments

android-radiogroup