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BranchingChoiceExample
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.choiceapp.MainActivity">
<TextView
android:id="@+id/question_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:text="Hello World!"/>
<ListView
android:id="@+id/question_options"
android:layout_weight="8"
android:layout_width="match_parent"
android:layout_height="0dp">
</ListView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/button_restart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Restart"/>
<Button
android:id="@+id/button_back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Back"/>
</LinearLayout>
</LinearLayout>
package com.example.choiceapp;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.EnumSet;
public class MainActivity extends AppCompatActivity
{
TextView mQuestionView;
ListView mOptionView;
QuestionAdapter mAdapter;
ListAdapter mAnswerAdapater;
Button mRestartButton;
Button mBackButton;
ArrayList<Question<?>> mAnsweredQuestions = new ArrayList<>();
enum Age
{
CHILD,
ADULT
}
enum Height
{
SHORT,
NORMAL,
TALL
}
enum Occupation
{
CHILD,
STUDENT,
WORKING,
JOBLESS
}
//Abstract, generic class.
//This class requires that another class extend it.
//the T represetns another class, in our case any of the Enums
//that provide us with the selectable options
abstract class Question<T>
{
String mQuestion;
T[] mOptions;
Question mNext;
T Answer;
public Question(String question, T... options)
{
mQuestion = question;
mOptions = options;
}
@Override
public String toString()
{
return Answer.toString();
}
public abstract Question getNext(int selectedOption);
}
///////////////
// Age
///////////////
class AgeQuestion extends Question<Age>
{
public AgeQuestion(Age... options)
{
super("Are you an adult?", options );
}
@Override
public Question getNext(int selectedOption)
{
Age option = mOptions[selectedOption];
Answer = option;
if (option == Age.ADULT)
{
//If adult, occuptation question will include these options
return new OccupationQuestion( Occupation.JOBLESS,
Occupation.STUDENT,
Occupation.WORKING );
}
else
{
//Otherwise just child, not that it matters.
return new OccupationQuestion( Occupation.CHILD );
}
}
}
///////////////
// Occuptation
///////////////
class OccupationQuestion extends Question<Occupation>
{
public OccupationQuestion(Occupation... options)
{
super("What is your occuptation?", options );
}
@Override
public Question getNext(int selectedOption)
{
Occupation option = mOptions[selectedOption];
this.Answer = option;
//Next question should contain all options regardless
return new HeightQuestion( Height.SHORT,
Height.NORMAL,
Height.TALL );
}
}
///////////////
// Height
///////////////
class HeightQuestion extends Question<Height>
{
public HeightQuestion(Height... options)
{
super("What is your height?", options );
}
@Override
public Question getNext(int selectedOption)
{
Height option = mOptions[selectedOption];
this.Answer = option;
//Last question, return null to indicate end.
return null;
}
}
private class QuestionAdapter extends BaseAdapter
{
Question mQuestion;
QuestionAdapter(){};
public void setQuestion(Question question)
{
mQuestion = question;
notifyDataSetChanged();
}
public Question getQuestion()
{
return mQuestion;
}
@Override
public int getCount()
{
if (mQuestion == null)
return 0;
return mQuestion.mOptions.length;
}
@Override
public Object getItem(int position)
{
return mQuestion.mOptions[position];
}
@Override
public long getItemId(int position)
{
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent)
{
if (convertView == null)
convertView = new Button(parent.getContext());
((Button)convertView).setText( mQuestion.mOptions[position].toString() ); //Just using toString of enum for simplciity
convertView.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Question question = mAdapter.getQuestion();
mAnsweredQuestions.add( question );
MainActivity.this.setupQuestion( question.getNext( position ) );
}
});
return convertView;
}
}
private void displayAnswers()
{
String[] answers = new String[mAnsweredQuestions.size()];
for (int i = 0; i < mAnsweredQuestions.size(); i++)
{
answers[i] = mAnsweredQuestions.get(i).toString();
}
mAnswerAdapater = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, answers);
mOptionView.setAdapter(mAnswerAdapater);
mBackButton.setEnabled(false);
}
private void setupQuestion( Question ques )
{
if (ques == null)
{
//All done, display answers
displayAnswers();
return;
}
mQuestionView.setText(ques.mQuestion);
mAdapter.setQuestion( ques);
}
void displayPreviousQuestion()
{
if (mAnsweredQuestions.isEmpty())
return;
Question prevQuestion = mAnsweredQuestions.remove( mAnsweredQuestions.size() -1 );
setupQuestion(prevQuestion);
}
void startQuestions()
{
mAnsweredQuestions.clear();
mAdapter = new QuestionAdapter();
mOptionView.setAdapter(mAdapter);
//Display first question with these options
setupQuestion( new AgeQuestion( Age.CHILD, Age.ADULT) );
mBackButton.setEnabled(true);
}
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mQuestionView = findViewById(R.id.question_text);
mOptionView = findViewById(R.id.question_options);
mBackButton = findViewById(R.id.button_back);
mRestartButton = findViewById(R.id.button_restart);
mBackButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
displayPreviousQuestion();
}
});
mRestartButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
startQuestions();
}
});
//Display first question
startQuestions();
}
}
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