Android Open Source - AbsListViewHelper Abs List View Helper

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License

The source code is released under:

MIT License

Java Source Code

package com.felipecsl.abslistviewhelper.library;
//from  w  w w.j  ava 2s . c  om
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.AbsListView;

import com.felipecsl.abslistviewhelper.library.widget.FooterAbsListViewScrollListener;
import com.felipecsl.abslistviewhelper.library.widget.HeaderAbsListViewScrollListener;

public class AbsListViewHelper {
    private final CompositeAbsListViewOnScrollListener scrollListener = new CompositeAbsListViewOnScrollListener();
    private final AbsListView absListView;
    private Bundle savedState;
    private HeaderAbsListViewScrollListener headerListener;
    private FooterAbsListViewScrollListener footerListener;
    private int paddingBottom;
    private int paddingTop;

    public AbsListViewHelper(final AbsListView absListView) {
        this(absListView, null);
    }

    public AbsListViewHelper(final AbsListView absListView, final Bundle savedState) {
        this.absListView = absListView;
        this.savedState = savedState;
        absListView.setClipToPadding(false);
        absListView.setOnScrollListener(scrollListener);

        if (savedState != null) {
            paddingTop = savedState.getInt("ABS_LIST_VIEW_HELPER_PADDING_TOP");
            paddingBottom = savedState.getInt("ABS_LIST_VIEW_HELPER_PADDING_BOTTOM");

            absListView.setPadding(
                    absListView.getPaddingLeft(), paddingTop,
                    absListView.getPaddingRight(), paddingBottom);
        }
    }

    public AbsListViewHelper setHeaderView(final View headerView) {
        headerListener = new HeaderAbsListViewScrollListener(headerView, savedState);
        scrollListener.registerOnScrollListener(headerListener);

        absListView.getViewTreeObserver().addOnGlobalLayoutListener(
                new ViewTreeObserver.OnGlobalLayoutListener() {
                    @Override public void onGlobalLayout() {
                        if (headerView.getHeight() == 0)
                            return;

                        absListView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                        paddingTop = headerView.getHeight() + dpToPx(absListView.getContext(), 10);
                        absListView.setPadding(
                                absListView.getPaddingLeft(),
                                paddingTop,
                                absListView.getPaddingRight(),
                                absListView.getPaddingBottom());

                        headerListener.setPaddingTop(dpToPx(absListView.getContext(), 10));

                        new Handler(Looper.getMainLooper()).post(new Runnable() {
                            @Override public void run() {
                                absListView.smoothScrollBy(-paddingTop, 0);
                            }
                        });
                    }
                });
        return this;
    }

    public AbsListViewHelper setFooterView(final View footerView) {
        footerListener = new FooterAbsListViewScrollListener(footerView, savedState);
        scrollListener.registerOnScrollListener(footerListener);

        absListView.getViewTreeObserver().addOnGlobalLayoutListener(
                new ViewTreeObserver.OnGlobalLayoutListener() {
                    @Override public void onGlobalLayout() {
                        if (footerView.getHeight() == 0)
                            return;

                        absListView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                        paddingBottom = footerView.getHeight() + dpToPx(absListView.getContext(), 10);
                        footerListener.setPaddingBottom(dpToPx(absListView.getContext(), 10));
                        absListView.setPadding(
                                absListView.getPaddingLeft(),
                                absListView.getPaddingTop(),
                                absListView.getPaddingRight(),
                                paddingBottom);
                    }
                });
        return this;
    }

    public AbsListViewHelper registerOnScrollListener(AbsListView.OnScrollListener listener) {
        scrollListener.registerOnScrollListener(listener);
        return this;
    }

    public AbsListView.OnScrollListener getOnScrollListener() {
        return scrollListener;
    }

    private static int dpToPx(final Context context, final float dp) {
        // Took from http://stackoverflow.com/questions/8309354/formula-px-to-dp-dp-to-px-android
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) ((dp * scale) + 0.5f);
    }

    public void onSaveInstanceState(Bundle outState) {
        outState.putInt("ABS_LIST_VIEW_HELPER_PADDING_TOP", paddingTop);
        outState.putInt("ABS_LIST_VIEW_HELPER_PADDING_BOTTOM", paddingBottom);

        if (headerListener != null)
            headerListener.onSaveInstanceState(outState);
        if (footerListener != null)
            footerListener.onSaveInstanceState(outState);
    }
}

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