Android Open Source - Rashr Quick Return List View

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.fima.cardsui.views;
//from w  w  w  .  j  a v  a2s  .co  m
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ListView;

public class QuickReturnListView extends ListView {

  private int mItemCount;
  private int mItemOffsetY[];
  private boolean scrollIsComputed = false;
  private int mHeight;

  public QuickReturnListView(Context context) {
    super(context);
  }

  public QuickReturnListView(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  public int getListHeight() {
    return mHeight;
  }

  public void computeScrollY() {
    mHeight = 0;
    try {
      mItemCount = getAdapter().getCount();
      if (mItemOffsetY == null) {
        mItemOffsetY = new int[mItemCount];
      }
      for (int i = 0; i < mItemCount; ++i) {
        View view = getAdapter().getView(i, null, this);
        view.measure(
            MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
            MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
        mItemOffsetY[i] = mHeight;
        mHeight += view.getMeasuredHeight();
      }
      scrollIsComputed = true;
    } catch (NullPointerException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }

  public boolean scrollYIsComputed() {
    return scrollIsComputed;
  }

  public int getComputedScrollY() {
    int pos, nScrollY, nItemY;
    View view = null;
    pos = getFirstVisiblePosition();
    view = getChildAt(0);
    nItemY = view.getTop();
    nScrollY = mItemOffsetY[pos] - nItemY;
    return nScrollY;
  }
}

Java Source Code List

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