标签：android android-recyclerview radio-button radio-group oncheckedchanged
在我的MainActivity方法中,必须修改checkAnswer和showSolution,因为我将RecycleView适配器添加到项目中并将所有视图项移动到QuestionAdapter.我不明白如何在QuestionAdapter中使用isChecked检查rbGroup单选按钮的状态,并将其id传递给MainActivity.
我试着检查一下：Radiogroup in recyclerview
但我仍然不清楚我接下来应该采取什么措施.
有人可以给我基本的指导,从现在起修改我的项目应该采取什么步骤.
仍然无法在回收视图中找到处理单选按钮列表的答案或教程.如何使用MainActivity界面检查单选按钮状态？
根据建议进行了一些更新.不明白我应该如何修改showSolution方法.
public class MainActivity extends AppCompatActivity {
public QuestionAdapter adapter;
public ArrayList<Question> questionList;
private int questionCountTotal;
private long backPressedTime;
private int score;
private int questionCounter;
private Button btnConfirmNext;
private boolean answered;
private Question currentQuestion;
private TextView tvQuestion, tvScore, tvQuestionCount, tvCountdown;
public QuizDbHelper dbHelper;
RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnConfirmNext = findViewById(R.id.confirm_button);
tvCountdown = findViewById(R.id.count_down);
tvScore = findViewById(R.id.text_view_score);
recyclerView = findViewById(R.id.recycler_view);
recyclerView.setNestedScrollingEnabled(false);
recyclerView.addItemDecoration(new DividerItemDecoration(recyclerView.getContext(), DividerItemDecoration.VERTICAL));
questionList = new ArrayList<>();
adapter = new QuestionAdapter(this, questionList);
RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(this, 1);
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(adapter);
dbHelper = new QuizDbHelper(this);
questionList = dbHelper.getAllQuestions();
questionCountTotal = questionList.size();
Collections.shuffle(questionList);
prepareQuestion();
btnConfirmNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
checkAnswer();
}
});
}
private void prepareQuestion() {
adapter = new QuestionAdapter(getApplicationContext(), questionList);
recyclerView.setAdapter(adapter);
if (questionCounter < questionCountTotal) {
currentQuestion = questionList.get(questionCounter);
answered = false;
btnConfirmNext.setText("Confirm");
} else {
finishQuiz();
}
}
//How should I handle it in onbindViewHolder
private void checkAnswer() {
answered = true;
countDownTimer.cancel();
RadioButton rbSelected = findViewById(rbGroup.getCheckedRadioButtonId());
int answerNb = rbGroup.indexOfChild(rbSelected) + 1;
if (answerNb == currentQuestion.getAnswerNB()) {
score++;
tvScore.setText("Score: " + score);
}
showSolution();
}
//How should I change state of the items in recycle view
private void showSolution() {
rb1.setTextColor(Color.RED);
rb2.setTextColor(Color.RED);
rb3.setTextColor(Color.RED);
rb4.setTextColor(Color.RED);
switch (currentQuestion.getAnswerNB()) {
case 1:
rb1.setTextColor(Color.GREEN);
break;
case 2:
rb2.setTextColor(Color.GREEN);
break;
case 3:
rb3.setTextColor(Color.GREEN);
break;
case 4:
rb4.setTextColor(Color.GREEN);
break;
}
btnConfirmNext.setText("Finish");
}
QuestionAdapter
public class QuestionAdapter extends RecyclerView.Adapter<QuestionAdapter.MyViewHolder> {
public ArrayList<Question> questionList;
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView tvQuestion, tvScore, tvQuestionCount, tvCountdown;
public RadioGroup rbGroup;
public RadioButton rb1, rb2, rb3, rb4;
public MyViewHolder(View view) {
super(view);
tvQuestion = view.findViewById(R.id.question);
rbGroup = view.findViewById(R.id.radiog_group);
rb1 = view.findViewById(R.id.radio_button1);
rb2 = view.findViewById(R.id.radio_button2);
rb3 = view.findViewById(R.id.radio_button3);
rb4 = view.findViewById(R.id.radio_button4);
}
}
public QuestionAdapter(Context mContext, ArrayList<Question> questionList) {
this.questionList = questionList;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.question_card, parent, false);
return new MyViewHolder(itemView);
}
@NonNull
@Override
public void onBindViewHolder(final MyViewHolder holder, int position) {
final Question question = questionList.get(position);
holder.tvQuestion.setText(question.getQuestion());
holder.rb1.setText(question.getOption1());
holder.rb2.setText(question.getOption2());
holder.rb3.setText(question.getOption3());
holder.rb4.setText(question.getOption4());
holder.rbGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, @IdRes int i) {
// How can I handle Check status here and pass it to main activity?
}
});
}
@Override
public int getItemCount() {
return questionList.size();
}
}
UPDATE.
在我的QuestionAdapter中添加接口并对构造函数和其他部分进行更改后,我在MainActivity中的checkAnswer看起来像这样
private void checkAnswer() {
answered = true;
countDownTimer.cancel();
adapter = new QuestionAdapter(getApplicationContext(), questionList, new QuestionAdapter.OnItemListener() {
@Override
public void onItemSelect(int position) {
if (position+1==currentQuestion.getAnswerNB()){
score++;
tvScore.setText("Score: " + score);
}
}
});
showSolution();
}
现在我应该用showSolution方法做什么？
似乎在checkAnswer之后我应该将信息发送回QuestionAdapter并在那里进行setTextColor.可能我走错了路……
解决方法:
你可以通过使用界面来做到这一点.
创建一个这样的接口：
public interface OnItemListener {
public void onItemSelect(int position);
}
然后在你的适配器中更改构造函数,如下所示：
QuestionAdapter(Context mContext, ArrayList<Question> questionList, OnItemListener
onItemListener) {
this.onItemListener = onItemListener;
this.questionList = questionList;
}
并在onCheckedChangeListener中添加此行
onItemListener.onItemSelect(position);
像这样：
holder.rbGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, @IdRes int i) {
// How can I handle Check status here and pass it to main activity?
onItemListener.onItemSelect(position);
}
});
然后在你的活动中添加你定义适配器的地方(它定义适配器的另一种方式,你也可以用自己的方式记住添加这样的接口(new OnItemListener …))：
dbHelper = new QuizDbHelper(getApplicationContext(), questionList, new
OnItemListener({
@Override
public void onItemSelect(int position) {
// handle your check state of adapter item here
}
});
标签：android,android-recyclerview,radio-button,radio-group,oncheckedchanged 来源： https://codeday.me/bug/20190731/1586509.html
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