Java:如果单击任何单选按钮，则从适配器获取信息到 Activity

Question

我无法从我的适配器到 Activity 中获取有关已选中单选按钮的信息

这是该回收站 View 中单选按钮所在的项目:

private boolean mRadioButton;
private String mCourseName, mHolesTxt, mHolesNm, mParTxt, mParNm;

public NewGameCourseItem(boolean radioButton, String courseName, String holesTxt, String holesNm, String parTxt, String parNm) {
    mRadioButton = radioButton;
    mCourseName = courseName;
    mHolesTxt = holesTxt;
    mHolesNm = holesNm;
    mParTxt = parTxt;
    mParNm = parNm;
}

public boolean getRadioButton() {
    return mRadioButton;
}

public String getCourseName() {
    return mCourseName;
}

public String getHolesTxt() {
    return mHolesTxt;
}

public String getHolesNm() {
    return mHolesNm;
}

public String getParTxt() {
    return mParTxt;
}

public String getParNm() {
    return mParNm;
}

这是我的适配器，它跟踪选择了哪个单选按钮:

public class ActivityNewGame2 extends AppCompatActivity {
    private RecyclerView mRecyclerView;
    private NewGameCourseAdapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;

    private ArrayList<NewGameCourseItem> mCourseList;

@Override
public void onBindViewHolder(@NonNull final NewGameCourseViewHolder holder, final int position) {

    /** This can prevent some unwanted actions in some cases **/
    holder.mRadioButton.setOnCheckedChangeListener(null);

    holder.mRadioButton.setChecked(selectedPosition == position);

    holder.mRadioButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
            selectedPosition = holder.getAdapterPosition();

            /** This part considers checking for radio buttons (checked or not) **/
            if (selectedPosition == position) {
                holder.mRadioButton.setChecked(true);
                notifyDataSetChanged();
            } else {
                holder.mRadioButton.setChecked(false);
                notifyDataSetChanged();
            }

这是我的 Activity ，我试图在其中检查该列表，这些单选按钮在哪里，以及如果这些单选按钮中的任何一个为真，那么当单击“开始游戏”按钮时， Intent 进行另一个 Activity :

    mStartGame = findViewById(R.id.button_start_game);

    mStartGame.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            for (int i = 0; i < mCourseList.size(); i++) {
                /** If any radio button is selected, then intent to another Activity **/
                if (mCourseList.get(i).getRadioButton() == true) {
                    Intent intent = new Intent(ActivityNewGame2.this, ActivityGame.class);
                    startActivity(intent);
                    overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left);
                }
            }

        }
    });

目前，它不会进行其他 Activity ...当我启动我的应用程序并单击不同的单选按钮时，它们会正确选择...

Answer 1

问题是你在选中复选框时没有更新你的对象类试试这个:

在您的适配器中:

if (selectedPosition == position) {
            holder.mRadioButton.setChecked(true);

          yourList.get(position).setRadioButton(holder.mRadioButton.isChecked)
            notifyDataSetChanged();
        } else {
            holder.mRadioButton.setChecked(false);
         yourList.get(position).setRadioButton(holder.mRadioButton.isChecked)
            notifyDataSetChanged();
        }

在您的 NewGameCourseItem 类中添加以下方法

public void setRadioButton(boolen isChecked) {
this.mRadioButton = isChecked;
}