多于ListView同步滚动

简介：

发展过程中可能遇到的2一个或多个其他listview为了用相应的关系保持滚动的情况下一起，本文演示了这种效应为大家。

功效：

实现原理：

在滚动当中不论什么一个ListView的时候，同一时候设置其它ListView的滚动位置。

演示样例中使用的是水平ListView。

HListView的项目托管地址是：https://github.com/sephiroth74/HorizontalVariableListView   有兴趣的能够研究一下

步骤：

1、为了能实现同一时候滚动的情况，有一些条件。首先是HListView的Item的宽度是一一直的，如我设置的

<?
xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="60dp"
    android:layout_height="60dp"
    android:gravity="center"
    android:background="#abcdef"
    android:text="Terry10" />

2、为了大家仅仅管的感受做法，我将源代码贴出例如以下，大家着重看关键代码就可以：

public class MainActivity extends Activity {

	private HListView mListView1;
	private HListView mListView2;
	private HListView mListView3;
	private HListView mListView4;
	private HListView mListView5;
	private List<HListView> viewList = new ArrayList<HListView>();

	private String[] contentArray = new String[] { "Terry1", "Terry2",
			"Terry3", "Terry4", "Terry5", "Terry6", "Terry7", "Terry8",
			"Terry9", "Terry10", "Terry11", "Terry12", "Terry13", "Terry14",
			"Terry15", "Terry16", "Terry17", "Terry18" };

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mListView1 = (HListView) findViewById(R.id.listview1);
		mListView2 = (HListView) findViewById(R.id.listview2);
		mListView3 = (HListView) findViewById(R.id.listview3);
		mListView4 = (HListView) findViewById(R.id.listview4);
		mListView5 = (HListView) findViewById(R.id.listview5);

		mListView1.setAdapter(new MyAdapter());
		mListView2.setAdapter(new MyAdapter());
		mListView3.setAdapter(new MyAdapter());
		mListView4.setAdapter(new MyAdapter());
		mListView5.setAdapter(new MyAdapter());

		viewList.add(mListView1);
		viewList.add(mListView2);
		viewList.add(mListView3);
		viewList.add(mListView4);
		viewList.add(mListView5);

		MyScrollListener mListener = new MyScrollListener();
		for (HListView item : viewList) {
			item.setOnScrollListener(mListener);
		}
	}

	private class MyScrollListener implements OnScrollListener {

		@Override
		public void onScrollStateChanged(AbsHListView view, int scrollState) {
			// 关键代码
			if (scrollState == SCROLL_STATE_IDLE
					|| scrollState == SCROLL_STATE_TOUCH_SCROLL) {
				View subView = view.getChildAt(0);
				if (subView != null) {
					final int top = subView.getLeft();
					final int position = view.getFirstVisiblePosition();
					for (HListView item : viewList) {
						item.setSelectionFromLeft(position, top);
					}
				}
			}
		}

		@Override
		public void onScroll(AbsHListView view, int firstVisibleItem,
				int visibleItemCount, int totalItemCount) {
			// 关键代码
			View subView = view.getChildAt(0);
			if (subView != null) {
				final int top = subView.getLeft();
				for (HListView item : viewList) {
					item.setSelectionFromLeft(firstVisibleItem, top);
				}
			}
		}

	}

	private class MyAdapter extends BaseAdapter {

		@Override
		public int getCount() {
			return contentArray.length;
		}

		@Override
		public Object getItem(int position) {
			return contentArray[position];
		}

		@Override
		public long getItemId(int position) {
			return position;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			TextView tv = (TextView) getLayoutInflater().inflate(R.layout.item,
					parent, false);
			tv.setText(contentArray[position]);
			return tv;
		}

	}
}

全文完

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