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}@Overridepublic 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;}@Overridepublic 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;}@Overrideprotected void onScrollChanged(int l, int t, int oldl, int oldt) {// TODO Auto-generated method stubsuper.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;@Overrideprotected 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() {@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stubint 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() {@Overridepublic void onScrollChanged(int l, int t, int oldl, int oldt) {// TODO Auto-generated method stubLog.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