Android Open Source - 2DScroller Two D Scroller Listview

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2013 - learnNcode (learnncode@gmail.com)
 * //  w  w w  .j av a  2s .  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 com.learnNcode.twoDScroller;


import android.R.integer;
import android.content.Context;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.media.AudioManager;
import android.media.AudioManager.OnAudioFocusChangeListener;
import android.media.SoundPool;
import android.util.AttributeSet;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.Transformation;
import android.widget.AbsListView;
import android.widget.ListView;

public class TwoDScrollerListview extends ListView {

  private int displayHeight;

  /* Size of internal Views */
  private float mChildRatio = 0.9f;

  /* Height of all children */
  private int mChildrenHeight;

  /* Height / 2 */
  private int mChildrenHeightMiddle;

  /* Height center of the ViewGroup */
  private int mHeightCenter;


  /* Number of pixel between the top of two Views */
  private int mSpaceBetweenViews = 20;

  /* Translation between two Views*/
  private int mTranslate = 12;

  /* Status of translation */
  private boolean mTranslatateEnbabled = false;

  /** Paint object to draw with */
  private final Paint mPaint = new Paint(Paint.FILTER_BITMAP_FLAG);


  public TwoDScrollerListview(Context context, AttributeSet attrs) {
    super(context, attrs);

    mPaint.setAntiAlias(true);

    setStaticTransformationsEnabled(true);

    displayHeight = ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getHeight();

  }

  /**
   * To start list from center.
   * 
   * @param context
   *         {@link Context}.
   */
  public void startListFromCenter(Context context) {

    View dummyHeader = new View(context);
    AbsListView.LayoutParams dummyHeaderParams = new AbsListView.LayoutParams(LayoutParams.MATCH_PARENT, (displayHeight/2  - 70)); 
    dummyHeader.setBackgroundColor(Color.TRANSPARENT);
    dummyHeader.setLayoutParams(dummyHeaderParams);
    addHeaderView(dummyHeader);
  }

  /**
   * To end list at center.
   * 
   * @param context
   *           {@link Context}.
   */
  public void endListAtCenter(Context context) {
    View dummyFooter = new View(context);
    AbsListView.LayoutParams dummyFooterParams = new AbsListView.LayoutParams(LayoutParams.MATCH_PARENT, (displayHeight/2 - 70)); /////
    dummyFooter.setBackgroundColor(Color.TRANSPARENT);
    dummyFooter.setLayoutParams(dummyFooterParams);
    addFooterView(dummyFooter);
  }


  /**
   * Define translation between 2 views
   * 
   * @param translate
   *           {@link integer} value.
   */
  public void setTranslation(int translate) {
    mTranslatateEnbabled = true;
    mTranslate = translate;
  }

  /**
   * To disable translation.
   */
  public void disableTranslate(){
    mTranslatateEnbabled = false;
  }


  /**
   * To play sound.
   * 
   * @param context
   *           {@link Context}
   * 
   * @param soundID
   *           sound id.
   *   
   * @param soundPool
   *           {@link SoundPool} instance.
   * 
   */
  public void playSound(Context context, int soundID, SoundPool soundPool){
    OnAudioFocusChangeListener afChangeListener = new OnAudioFocusChangeListener() {
      public void onAudioFocusChange(int focusChange) {
        if (focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK){
          // Lower the volume
        } else if (focusChange == AudioManager.AUDIOFOCUS_GAIN) {
          // Raise it back to normal
        }
      }
    };
    AudioManager audioManager = (AudioManager)context.getSystemService(Context.AUDIO_SERVICE);

    // Request audio focus for playback
    int result = audioManager.requestAudioFocus(afChangeListener,
        // Use the music stream.
        AudioManager.STREAM_MUSIC,
        // Request permanent focus.
        AudioManager.AUDIOFOCUS_GAIN);

    if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
      // Start playback.
      soundPool.play(soundID, 10, 10, 1, 0,1f );
    }
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

    final int specWidthSize  = MeasureSpec.getSize(widthMeasureSpec);
    final int specHeightSize = MeasureSpec.getSize(heightMeasureSpec);

    mHeightCenter   = (int) (specHeightSize * mChildRatio);
    mChildrenHeight = (int) (specHeightSize * mChildRatio);

    mChildrenHeightMiddle = mChildrenHeight/2;
    setMeasuredDimension(specWidthSize, specHeightSize);
  }



  @Override
  protected boolean getChildStaticTransformation(View child, Transformation t) {

    int topCenterView = mHeightCenter - mChildrenHeightMiddle;
    int childTop      = Math.max(0,child.getTop());
    float offset      = (-childTop + topCenterView)/ (float) mSpaceBetweenViews;
    final Matrix matrix = t.getMatrix();
    if (offset != 0) {
      float absOffset = Math.abs(offset);
      t.clear();
      t.setTransformationType(Transformation.TYPE_MATRIX);

      float px = child.getLeft() + (child.getWidth()) / 2;
      float py = child.getTop() + (child.getHeight()) / 2; 

      if (mTranslatateEnbabled){
        matrix.setTranslate(mTranslate * absOffset, 0);
      }

      if (offset > 0) {
        matrix.preTranslate(-px,0);
        matrix.postTranslate(px,0);
      } else {
        matrix.preTranslate(-px, -py);
        matrix.postTranslate(px, py);
      }
    }
    return true;
  }

}

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