Android Open Source - android-flash-cards Card Fragment

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License

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

/*
 * Copyright 2011, 2012 Thomas Amsler/*from   w  w  w  . j a  v  a  2  s  .  c o m*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */

package org.thomasamsler.android.flashcards.fragment;

import org.thomasamsler.android.flashcards.AppConstants;
import org.thomasamsler.android.flashcards.MainApplication;
import org.thomasamsler.android.flashcards.R;
import org.thomasamsler.android.flashcards.model.Card;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

public class CardFragment extends Fragment implements AppConstants {

  private final static String CARD_QUESTION = "q";
  private final static String CARD_ANSWER = "a";
  private final static String MAX_KEY = "m";
  private final static String CARD_POSITION_KEY = "p";
  
  private boolean mWordToggle = false;
  private StringBuilder mCounterStringBuilder;
  private TextView mTextViewQuestion;
  private TextView mTextViewAnswer;
  private TextView mCounterTextView;
  private EditText mEditTextWord;
  private LinearLayout mLinearLayoutEditButtons;
  private ImageButton mImageButtonSave;
  private ImageButton mImageButtonCancel;
  private int mCardPosition;
  private String mCardQuestion;
  private String mCardAnswer;
  private View mCardView;
  private int mFontSize;

  public static CardFragment newInstance(Card card, int wordIndex, int totalWords, int fontSize) {
    
    CardFragment pageFragment = new CardFragment();
    pageFragment.setFontSize(fontSize);
    Bundle bundle = new Bundle();

    bundle.putString(CARD_QUESTION, card.getQuestion());
    bundle.putString(CARD_ANSWER, card.getAnswer());
    bundle.putInt(CARD_POSITION_KEY, wordIndex);
    bundle.putInt(MAX_KEY, totalWords);
    pageFragment.setArguments(bundle);
    
    return pageFragment;
  }


  @Override
  public void onActivityCreated(final Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
  }
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    mCardView = inflater.inflate(R.layout.card_fragment, container, false);

    mCardQuestion = getArguments().getString(CARD_QUESTION);
    mCardAnswer = getArguments().getString(CARD_ANSWER);
    mCardPosition = getArguments().getInt(CARD_POSITION_KEY);
    
    mTextViewQuestion = (TextView)mCardView.findViewById(R.id.textViewQuestion);
    mTextViewQuestion.setTextSize(TypedValue.COMPLEX_UNIT_SP, mFontSize);
    
    if(null != mCardQuestion) {
    
      mTextViewQuestion.setText(mCardQuestion);
    }
    else {
      
      mTextViewQuestion.setText("");
    }

    mTextViewAnswer = (TextView)mCardView.findViewById(R.id.textViewAnswer);
    mTextViewAnswer.setTextSize(TypedValue.COMPLEX_UNIT_SP, mFontSize);
    
    if(null != mCardAnswer) {
      
      mTextViewAnswer.setText(mCardAnswer);
    }
    else {
      
      mTextViewAnswer.setText("");
    }

    mEditTextWord = (EditText)mCardView.findViewById(R.id.editTextWord);
    mEditTextWord.setTextSize(TypedValue.COMPLEX_UNIT_SP, mFontSize);

    mLinearLayoutEditButtons = (LinearLayout)mCardView.findViewById(R.id.linearLayoutEditButtons);

    mImageButtonSave = (ImageButton)mCardView.findViewById(R.id.imageButtonSave);
    mImageButtonSave.setOnClickListener(new OnClickListener() {

      public void onClick(View v) {

        /*
         * General input validation
         */
        if(!isValid(mEditTextWord.getText().toString().trim())) {
          
          return;
        }
        
        /*
         * User has to enter non empty string for front of card
         */
        String editText = mEditTextWord.getText().toString();
        if(!mWordToggle && (null == editText || "".equals(editText))) {
          
          Toast.makeText(getActivity().getApplicationContext(), R.string.input_validation_warning2, Toast.LENGTH_SHORT).show();
          return;
        }
        
        mEditTextWord.setVisibility(View.INVISIBLE);
        mLinearLayoutEditButtons.setVisibility(View.INVISIBLE);

        /*
         * Check if the user changed anything, and only update if there is a change
         */
        if(!mWordToggle && !mEditTextWord.getText().toString().equals(mTextViewQuestion.getText().toString())) {

          mTextViewQuestion.setText(mEditTextWord.getText());
          mTextViewQuestion.setVisibility(View.VISIBLE);
          Card updatedCard = new Card();
          updatedCard.setRandomCardIndex(mCardPosition);
          updatedCard.setQuestion(mEditTextWord.getText().toString());
          updatedCard.setAnswer(mTextViewAnswer.getText().toString());
          ((MainApplication)getActivity().getApplication()).doAction(ACTION_UPDATE_CARD, updatedCard);
        }
        else if(mWordToggle && !mEditTextWord.getText().toString().equals(mTextViewAnswer.getText().toString())) {
          
          mTextViewAnswer.setText(mEditTextWord.getText());
          mTextViewAnswer.setVisibility(View.VISIBLE);
          Card updatedCard = new Card();
          updatedCard.setRandomCardIndex(mCardPosition);
          updatedCard.setQuestion(mTextViewQuestion.getText().toString());
          updatedCard.setAnswer(mEditTextWord.getText().toString());
          ((MainApplication)getActivity().getApplication()).doAction(ACTION_UPDATE_CARD, updatedCard);
        }
        else if(!mWordToggle) {

          mTextViewQuestion.setVisibility(View.VISIBLE);
        }
        else if(mWordToggle) {
          
          mTextViewAnswer.setVisibility(View.VISIBLE);
        }
      }
    });

    mImageButtonCancel = (ImageButton)mCardView.findViewById(R.id.imageButtonCancel);
    mImageButtonCancel.setOnClickListener(new OnClickListener() {

      public void onClick(View v) {

        mEditTextWord.setVisibility(View.INVISIBLE);
        
        if(mWordToggle) {
          
          mTextViewAnswer.setVisibility(View.VISIBLE);
        }
        else {
          
          mTextViewQuestion.setVisibility(View.VISIBLE);
        }
        
        mLinearLayoutEditButtons.setVisibility(View.INVISIBLE);
      }
    });
    
    // Set the bottom word counter
    mCounterTextView = (TextView) mCardView.findViewById(R.id.textViewWordNumber);
    mCounterStringBuilder = new StringBuilder();
    mCounterStringBuilder.append(mCardPosition + 1);
    mCounterStringBuilder.append(_OF_);
    mCounterStringBuilder.append(getArguments().getInt(MAX_KEY));
    mCounterTextView.setText(mCounterStringBuilder.toString());
    mCounterTextView.append(FRONT);

    mCardView.setOnClickListener(new OnClickListener() {
      
      public void onClick(View v) {

        turnPage(mCardView);
      }
    });
    
    return mCardView;
  }

  public void setFontSize(int size) {
    
    mFontSize = size;

    if(null != mTextViewQuestion && null != mTextViewAnswer) {
    
      mTextViewQuestion.setTextSize(TypedValue.COMPLEX_UNIT_SP, mFontSize);
      mTextViewAnswer.setTextSize(TypedValue.COMPLEX_UNIT_SP, mFontSize);
    }
  }
  
  public void onEdit() {
    
    mTextViewQuestion.setVisibility(View.INVISIBLE);
    mTextViewAnswer.setVisibility(View.INVISIBLE);
    
    if(mWordToggle) {
      
      mEditTextWord.setText(mTextViewAnswer.getText());
    }
    else {
    
      mEditTextWord.setText(mTextViewQuestion.getText());
    }
     
    mEditTextWord.setVisibility(View.VISIBLE);
    mEditTextWord.setSelection(mEditTextWord.getText().length());
    mLinearLayoutEditButtons.setVisibility(View.VISIBLE);
  }
  
  private void turnPage(final View view) {
  
    /*
     * If in edit mode, we don't allow the user to switch between the front and back page.
     */
    if(mEditTextWord.isShown()) {
      
      return;
    }
    
    final Animation flip1 = AnimationUtils.loadAnimation(view.getContext(), R.anim.flip1);
    final Animation flip2 = AnimationUtils.loadAnimation(view.getContext(), R.anim.flip2);
    
    flip1.setAnimationListener(new AnimationListener() {
      
      public void onAnimationStart(Animation animation) { /* Nothing to do here */ }
      
      public void onAnimationRepeat(Animation animation) { /* Nothing to do here */ }
      
      public void onAnimationEnd(Animation animation) {
        
        mWordToggle ^= true;

        if(mWordToggle) {

          mTextViewQuestion.setVisibility(View.INVISIBLE);
          mTextViewAnswer.setVisibility(View.VISIBLE);
          mCounterTextView.setText(mCounterStringBuilder.toString());
          mCounterTextView.append(BACK);
        }
        else {

          mTextViewQuestion.setVisibility(View.VISIBLE);
          mTextViewAnswer.setVisibility(View.INVISIBLE);
          mCounterTextView.setText(mCounterStringBuilder.toString());
          mCounterTextView.append(FRONT);
        }
        
        view.startAnimation(flip2);
      }
    });
    
    view.startAnimation(flip1);
  }
  
  private boolean isValid(String input) {
    
    if(null == input) {
      
      Toast.makeText(getActivity().getApplicationContext(), R.string.input_validation_warning, Toast.LENGTH_SHORT).show();
      return false;
    }
    
    return true;
  }
}
Java Source Code List
