ScrollLayoutForListView.java

package my.project.easyrecharge.view;

import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.TranslateAnimation;
import android.widget.ScrollView;

public class ScrollLayoutForListView extends ScrollView {

	private View inner;
	private float y;
	private Rect normal = new Rect();
	private boolean isCount = false;

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

	@Override
	protected void onFinishInflate() {
		if (getChildCount() > 0) {
			inner = getChildAt(0);
		}
	}

	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		if (inner != null) {
			commOnTouchEvent(ev);
		}
		return super.onTouchEvent(ev);
	}

	private void commOnTouchEvent(MotionEvent ev) {
		int action = ev.getAction();
		switch (action) {
		case MotionEvent.ACTION_DOWN:
			break;
		case MotionEvent.ACTION_UP:
			if (isNeedAnimation()) {
				animation();
				isCount = false;
			}
			break;
		case MotionEvent.ACTION_MOVE:
			final float preY = y;
			float nowY = ev.getY();
			int deltaY = (int) (preY - nowY);
			if (!isCount) {
				deltaY = 0;
			}
			y = nowY;
			if (isNeedMove()) {
				if (normal.isEmpty()) {
					normal.set(inner.getLeft(), inner.getTop(),
							inner.getRight(), inner.getBottom());
				}

				inner.layout(inner.getLeft(), inner.getTop() - deltaY / 2,
						inner.getRight(), inner.getBottom() - deltaY / 2);
			}
			isCount = true;
			break;
		default:
			break;
		}
	}

	private boolean isNeedMove() {
		int offset = inner.getMeasuredHeight() - getHeight();
		int scrollY = getScrollY();
		if (scrollY == 0 || scrollY == offset) {
			return true;
		}
		return false;
	}

	private void animation() {
		TranslateAnimation ta = new TranslateAnimation(0, 0, inner.getTop(),
				normal.top);
		ta.setDuration(300);
		inner.startAnimation(ta);
		inner.layout(normal.left, normal.top, normal.right, normal.bottom);
		normal.setEmpty();

	}

	private boolean isNeedAnimation() {
		return !normal.isEmpty();
	}

}