Android Open Source - dv-quiz Quiz Form Activity

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Back to project page dv-quiz.
License

The source code is released under:
Apache License
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Java Source Code

package com.dvorakdev.dvquiz;
/*  w  ww . j  a va2s.  c  o  m*/
import java.io.File;
import java.net.URISyntaxException;
import java.util.Scanner;

import com.dvorakdev.dvquiz.context.dvQuizContext;
import com.dvorakdev.dvquiz.model.Answer;
import com.dvorakdev.dvquiz.model.Category;
import com.dvorakdev.dvquiz.model.Question;
import com.dvorakdev.dvquiz.model.Quiz;
import com.dvorakdev.dvquiz.reference.dvQuizReference;
import com.dvorakdev.lib.dvUtils;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import android.support.v4.app.NavUtils;
import android.content.Intent;

public class QuizFormActivity extends Activity {

  private Quiz quiz;
  
  private Spinner categorySpinner;
  private EditText quizNameEditText;
  private TextView quizFileNameTextView;
  private File quizFile;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_quiz_form);
    
    this.categorySpinner = (Spinner) findViewById(R.id.categorySpinner);
    this.quizNameEditText = (EditText) this.findViewById(R.id.quizNameEditText);
    this.quizFileNameTextView = (TextView) this.findViewById(R.id.quizFileNameTextView);
    
    this.quiz = (Quiz) dvQuizContext.getInstance().getValue("selectedQuiz", new Quiz());
        
        ArrayAdapter<Category> adapter = new ArrayAdapter<Category>(this,
        android.R.layout.simple_spinner_item, Category.allOrderBy("Name ASC"));
        
        this.categorySpinner.setAdapter(adapter);
        
        // TODO Falta armar toda la parte de la edici?n
        if (!this.quiz.isNew())
        {
          this.findViewById(R.id.quizFileNameTextView).setVisibility(View.GONE);
          this.findViewById(R.id.quizSelectFileButton).setVisibility(View.GONE);
        }
  }

  public void selectFile(View view) {
    
    /*
     * Author: http://stackoverflow.com/users/377260/paul-burke
     */
    Intent intent = new Intent(Intent.ACTION_GET_CONTENT); 
    intent.setType("*/*"); 
    intent.addCategory(Intent.CATEGORY_OPENABLE);

    try {
      startActivityForResult(
          Intent.createChooser(intent, "Select a File to Upload"),
          dvQuizReference.SELECT_QUIZ_FILE.getReferenceValue());
    } catch (android.content.ActivityNotFoundException ex) {
      // Potentially direct the user to the Market with a Dialog
      Toast.makeText(this, "Please install a File Manager.", 
          Toast.LENGTH_SHORT).show();
    }
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.quiz_form, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case android.R.id.home:
      // This ID represents the Home or Up button. In the case of this
      // activity, the Up button is shown. Use NavUtils to allow users
      // to navigate up one level in the application structure. For
      // more details, see the Navigation pattern on Android Design:
      //
      // http://developer.android.com/design/patterns/navigation.html#up-vs-back
      //
      NavUtils.navigateUpFromSameTask(this);
      return true;
    case R.id.action_add_category:
      this.startActivityForResult(new Intent(this, CategoryFormActivity.class), dvQuizReference.ADD_NEW_CATEGORY.getReferenceValue());
    }
    return super.onOptionsItemSelected(item);
  }
  
  public void processForm(View view)
  {
    String error = this.isValid();
    
    if (error == null)
    {      
      this.quiz.setCategory((Category) this.categorySpinner.getAdapter().getItem(this.categorySpinner.getSelectedItemPosition()));
      this.quiz.setName(this.quizNameEditText.getText().toString());
      
      this.quiz.save();
      
      this.populateQuiz();
      
      this.setResult(RESULT_OK);
      
      this.finish();
    }
    else
    {
      Toast.makeText(this, error, Toast.LENGTH_SHORT).show();
    }
  }
  
  public String isValid()
  {    
    // TODO i18n
    if ((this.categorySpinner.getSelectedItemId() == -1) || (this.categorySpinner.getSelectedItem() == null))
    {
      return String.format("You must select a Category.");
    }
    
    if ((this.quizNameEditText.getText().toString() == ""))
    {
      return String.format("You must set a Quiz name.");
    }
    
    Category selectedCategory = (Category) this.categorySpinner.getAdapter().getItem(this.categorySpinner.getSelectedItemPosition());
    
    if (selectedCategory.getQuizByName(this.quizNameEditText.getText().toString()) != null)
    {
      return String.format(this.getString(R.string.error_object_already_exists), "Quiz");
    }
    
    if (!this.isQuizFileValid(this.quizFile))
    {
      // TODO i18n
      return String.format("Invalid quiz file.");
    }
    
    return null;        
  }
  
  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    
      if (requestCode == dvQuizReference.ADD_NEW_CATEGORY.getReferenceValue()) {
        
          if (resultCode == RESULT_OK) {
          
              Spinner s = (Spinner) findViewById(R.id.categorySpinner);
              
              ArrayAdapter<Category> adapter = new ArrayAdapter<Category>(this,
              android.R.layout.simple_spinner_item, Category.allOrderBy("Name ASC"));
              
              s.setAdapter(adapter);
              
              s.setSelection(adapter.getCount() - 1);
          }
      }
    
    /*
     * Author: http://stackoverflow.com/users/377260/paul-burke
     */
      if (requestCode == dvQuizReference.SELECT_QUIZ_FILE.getReferenceValue()) {
        
        if (data == null)
        {
          return;
        }
            
            try
            {              
              this.quizFile = new File(dvUtils.getPath(this, data.getData()));
              this.quizFileNameTextView.setText(this.quizFile.getName());
      }
            catch (URISyntaxException e)
            {
        e.printStackTrace();
      }
      }
  }
  
  private void populateQuiz()
  {  
    try
    {      
      Scanner fileScanner = new Scanner(this.quizFile);
      
      fileScanner.nextLine();
      
      Integer quizQuestionsQty = Integer.valueOf(fileScanner.nextLine());
      
      for (int i = 0; i < quizQuestionsQty; i++)
      {
        Question aQuestion = new Question();
        
        String question = fileScanner.nextLine();
        
        aQuestion.setQuiz(this.quiz);
        aQuestion.setQuestion(question); //dvUtils.cleanString(question));
        
        aQuestion.save();        
        
        Integer questionAnswersQty = Integer.valueOf(fileScanner.nextLine());
        
        for (int j = 0; j < questionAnswersQty; j++)
        {
          Answer anAnswer = new Answer();
          
          String answer = fileScanner.nextLine();
          
          anAnswer.setQuestion(aQuestion);
          anAnswer.setAnswer(answer);
          
          anAnswer.save();
        }
        
        Integer correctAnswerPosition = Integer.valueOf(fileScanner.nextLine());
        
        aQuestion.setCorrectAnswer(aQuestion.getAnswers().get(correctAnswerPosition));
        
        aQuestion.save();    
      }
      
      fileScanner.close();
    }
    catch (Exception e)
    {
      
    }    
  }
  
  private Boolean isQuizFileValid(File aQuizFile)
  {
    Boolean isValid = false;
    
    try
    {      
      Scanner fileScanner = new Scanner(aQuizFile);
      
      fileScanner.nextLine();
      
      Integer quizQuestionsQty = Integer.valueOf(fileScanner.nextLine());
      
      for (int i = 0; i < quizQuestionsQty; i++)
      {
        fileScanner.nextLine();
        
        Integer questionAnswersQty = Integer.valueOf(fileScanner.nextLine());
        
        for (int j = 0; j < questionAnswersQty; j++)
        {
          fileScanner.nextLine();
        }
        
        Integer.valueOf(fileScanner.nextLine());
      }
      
      fileScanner.close();
      
      isValid = true;
    }
    catch (Exception e)
    {
      
    }
    
    return isValid;
  }

}
Java Source Code List
