ScrollView做的上拉效果

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.ScrollView;

public class MyScrollView extends ScrollView {

	// 滚动监听接口
	private OnScrollChangedListeneer onScrollChangedListeneer;

	public MyScrollView(Context context) {
		super(context);
		// TODO Auto-generated constructor stub
	}

	public MyScrollView(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
	}

	public MyScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
		super(context, attrs, defStyleAttr);
		// TODO Auto-generated constructor stub
	}

	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		// TODO Auto-generated method stub
		// 屏蔽touch事件,才能在监听其子控件的touch事件
		super.onTouchEvent(ev);
		return false;
	}

	@Override
	public boolean onInterceptTouchEvent(MotionEvent event) {
		// 屏蔽touch事件传递,才能在监听其子控件的touch事件
		super.onInterceptTouchEvent(event);
		return false;
	}

	@Override
	protected void onScrollChanged(int l, int t, int oldl, int oldt) {
		// TODO Auto-generated method stub
		super.onScrollChanged(l, t, oldl, oldt);
		if (onScrollChangedListeneer != null) {
			onScrollChangedListeneer.onScrollChanged(l, t, oldl, oldt);
		}
	}

	// 滚动事件监听，获取滚动的距离，用户处理一些其他事
	public interface OnScrollChangedListeneer {
		public void onScrollChanged(int l, int t, int oldl, int oldt);
	}

	public void setOnScrollChangedListeneer(
			OnScrollChangedListeneer onScrollChangedListeneer) {
		this.onScrollChangedListeneer = onScrollChangedListeneer;
	}

}

import android.app.Activity;
import android.content.Context;
import android.graphics.Point;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.WindowManager;
import android.widget.RelativeLayout.LayoutParams;

import com.mb.door.MyScrollView.OnScrollChangedListeneer;
import com.ywl5320.scrollanima.R;

public class MainActivity extends Activity {

	private View layout_content;
	private MyScrollView scrollView;
	private int offsetsum = 0;// 总的手指滑动距离
	private Point point = new Point();
	private View layout_sliding;

	private boolean isOpen = false; // true:显示详情 false 反之
	private int screenHeight = 0;

	private int handlerHeight = 100;// 把手的高度,该高度最好动态获取
	private int threshold=300; 
	private Context context;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		context = this;
		initViews();
	}

	private void initViews(){
		handlerHeight = dip2px(context, 100);// 把手的高度,该高度最好动态获取
		int statusBarHeight=getStatusBarHeight();
		
		scrollView = (MyScrollView) findViewById(R.id.scrollView);
		layout_content = findViewById(R.id.layout_content);
		layout_sliding = findViewById(R.id.layout_sliding);

		// 设置滑动层为屏幕高度
		LayoutParams lp = (LayoutParams) layout_content.getLayoutParams();
		screenHeight = getScreenHeight();
		lp.height = screenHeight - statusBarHeight;
		layout_content.setLayoutParams(lp);

		// 设置详细层的高度：等于屏幕高度-状态栏高度-阴影提示高度
		LayoutParams lp2 = (LayoutParams) layout_sliding.getLayoutParams();
		lp2.height = screenHeight  - statusBarHeight- handlerHeight;
		layout_sliding.setLayoutParams(lp2);

		// 为上层添加touch事件，控制详情页显示隐藏
		layout_content.setOnTouchListener(new OnTouchListener() {

			@Override
			public boolean onTouch(View v, MotionEvent event) {
				// TODO Auto-generated method stub
				int action = event.getAction();
				int offsety = 0;
				int y = 0;
				switch (action) {
				case MotionEvent.ACTION_DOWN:
					point.y = (int) event.getRawY();
					offsetsum = 0;
					break;
				case MotionEvent.ACTION_MOVE:
					y = (int) event.getRawY();
					offsety = y - point.y;
					offsetsum += offsety;
					point.y = (int) event.getRawY();
					scrollView.scrollBy(0, -offsety);
					break;
				case MotionEvent.ACTION_UP:
					if(offsetsum==0){
						return true;
					}
					if (offsetsum > 0) {// offsetsum大于0时是往下拉
						if (offsetsum > threshold) {
							close();
						} else {
							open();
						}
					} else {// offsetsum小于0时是往上拉
						if (offsetsum < -threshold) {
							open();
						} else {
							close();
						}
					}

					break;
				}
				return true;
			}
		});

		scrollView.setOnScrollChangedListeneer(new OnScrollChangedListeneer() {

			@Override
			public void onScrollChanged(int l, int t, int oldl, int oldt) {
				// TODO Auto-generated method stub
				Log.i("tag", l + "--" + t + "--" + oldl + "--"+ oldt);
			}
		});
	}
	
	private void open() {
		scrollView.smoothScrollTo(0, screenHeight - handlerHeight);
		isOpen = true;
	}

	private void close() {
		scrollView.smoothScrollTo(0, 0);
		isOpen = false;
	}

	public void toggle(){
		if(isOpen){
			close();
		}else{
			open();
		}
	}
	
	/**
	 * 获取屏幕高度
	 * 
	 * @return
	 */
	public int getScreenHeight() {
		WindowManager wManager = (WindowManager) getApplicationContext()
				.getSystemService(Context.WINDOW_SERVICE);
		DisplayMetrics dm = new DisplayMetrics();
		wManager.getDefaultDisplay().getMetrics(dm);
		return dm.heightPixels;
	}

	/**
	 * dip转换为px
	 * 
	 * @param context
	 * @param dipValue
	 * @return
	 */
	public int dip2px(Context context, float dipValue) {
		final float scale = context.getResources().getDisplayMetrics().density;
		return (int) (dipValue * scale + 0.5f);
	}

	/**
	 * 获取状态栏高度
	 * 
	 * @return
	 */
	public int getStatusBarHeight() {
		int result = 0;
		int resourceId = getResources().getIdentifier("status_bar_height",
				"dimen", "android");
		if (resourceId > 0) {
			result = getResources().getDimensionPixelSize(resourceId);
		}
		return result;
	}

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="${relativePackage}.${activityClass}" >

    <com.mb.door.MyScrollView
        android:id="@+id/scrollView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="none" >

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent" >

            <FrameLayout
                android:id="@+id/layout_content"
                android:layout_width="match_parent"
                android:layout_height="match_parent" >

                <FrameLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_gravity="center"
                    android:background="@android:color/holo_blue_dark" >
                </FrameLayout>

                <TextView
                    android:id="@+id/handler"
                    android:layout_width="match_parent"
                    android:layout_height="100dip"
                    android:layout_gravity="bottom"
                    android:background="#aa000000"
                    android:gravity="center"
                    android:text="上滑查看详情"
                    android:textColor="#ffffff" />
            </FrameLayout>

            <FrameLayout 
                android:id="@+id/layout_sliding"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_below="@id/layout_content"
                android:background="@android:color/white"
                >
            </FrameLayout>
            
        </RelativeLayout>
    </com.mb.door.MyScrollView>

</RelativeLayout>

事实上，同样的效果可以使用 ViewDragHelper实现
http://gundumw100.iteye.com/blog/2114716