Android Open Source - AndroidAmazingListView Amazing List View

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License

The source code is released under:

Apache License

Java Source Code

package com.foound.widget;
// w  w w. j a  va  2s . c om
import android.content.*;
    import android.graphics.*;
    import android.util.*;
    import android.view.*;
    import android.widget.*;

    import com.foound.widget.AmazingAdapter.HasMorePagesListener;

/**
 * A ListView that maintains a header pinned at the top of the list. The
 * pinned header can be pushed up and dissolved as needed.
 *
 * It also supports pagination by setting a custom view as the loading
 * indicator.
 */
public class AmazingListView extends ListView implements HasMorePagesListener {
  public static final String TAG = AmazingListView.class.getSimpleName();

  View listFooter;
  boolean footerViewAttached = false;

  private View mHeaderView;
  private boolean mHeaderViewVisible;

  private int mHeaderViewWidth;
  private int mHeaderViewHeight;

  private AmazingAdapter adapter;

  public void setPinnedHeaderView(View view) {
    mHeaderView = view;

    // Disable vertical fading when the pinned header is present
    // TODO change ListView to allow separate measures for top and bottom fading edge;
    // in this particular case we would like to disable the top, but not the bottom edge.
    if (mHeaderView != null) {
      setFadingEdgeLength(0);
    }
    requestLayout();
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    if (mHeaderView != null) {
      measureChild(mHeaderView, widthMeasureSpec, heightMeasureSpec);
      mHeaderViewWidth = mHeaderView.getMeasuredWidth();
      mHeaderViewHeight = mHeaderView.getMeasuredHeight();
    }
  }

  @Override
  protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    super.onLayout(changed, left, top, right, bottom);
    if (mHeaderView != null) {
      mHeaderView.layout(0, 0, mHeaderViewWidth, mHeaderViewHeight);
      configureHeaderView(getFirstVisiblePosition());
    }
  }

  public void configureHeaderView(int position) {
    if (mHeaderView == null) {
      return;
    }

    int state = adapter.getPinnedHeaderState(position);
    switch (state) {
      case AmazingAdapter.PINNED_HEADER_GONE: {
        mHeaderViewVisible = false;
        break;
      }

      case AmazingAdapter.PINNED_HEADER_VISIBLE: {
        adapter.configurePinnedHeader(mHeaderView, position, 255);
        if (mHeaderView.getTop() != 0) {
          mHeaderView.layout(0, 0, mHeaderViewWidth, mHeaderViewHeight);
        }
        mHeaderViewVisible = true;
        break;
      }

      case AmazingAdapter.PINNED_HEADER_PUSHED_UP: {
        View firstView = getChildAt(0);
        if (firstView != null) {
          int bottom = firstView.getBottom();
          int headerHeight = mHeaderView.getHeight();
          int y;
          int alpha;
          if (bottom < headerHeight) {
            y = (bottom - headerHeight);
            alpha = 255 * (headerHeight + y) / headerHeight;
          } else {
            y = 0;
            alpha = 255;
          }
          adapter.configurePinnedHeader(mHeaderView, position, alpha);
          if (mHeaderView.getTop() != y) {
            mHeaderView.layout(0, y, mHeaderViewWidth, mHeaderViewHeight + y);
          }
          mHeaderViewVisible = true;
        }
        break;
      }
    }
  }

  @Override
  protected void dispatchDraw(Canvas canvas) {
    super.dispatchDraw(canvas);
    if (mHeaderViewVisible) {
      drawChild(canvas, mHeaderView, getDrawingTime());
    }
  }


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

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

  public AmazingListView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
  }

  public void setLoadingView(View listFooter) {
    this.listFooter = listFooter;
  }

  public View getLoadingView() {
    return listFooter;
  }

  @Override
  public void setAdapter(ListAdapter adapter) {
    if (!(adapter instanceof AmazingAdapter)) {
      throw new IllegalArgumentException(AmazingListView.class.getSimpleName() + " must use adapter of type " + AmazingAdapter.class.getSimpleName());
    }

    // previous adapter
    if (this.adapter != null) {
      this.adapter.setHasMorePagesListener(null);
      this.setOnScrollListener(null);
    }

    this.adapter = (AmazingAdapter) adapter;
    ((AmazingAdapter)adapter).setHasMorePagesListener(this);
    this.setOnScrollListener((AmazingAdapter) adapter);

    View dummy = new View(getContext());
    super.addFooterView(dummy);
    super.setAdapter(adapter);
    super.removeFooterView(dummy);
  }

  @Override
  public AmazingAdapter getAdapter() {
    return adapter;
  }

  @Override
  public void noMorePages() {
    if (listFooter != null) {
      this.removeFooterView(listFooter);
    }
    footerViewAttached = false;
  }

  @Override
  public void mayHaveMorePages() {
    if (! footerViewAttached && listFooter != null) {
      this.addFooterView(listFooter);
      footerViewAttached = true;
    }
  }

  public boolean isLoadingViewVisible() {
    return footerViewAttached;
  }
}

Java Source Code List

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