XScrollView 自定义组件，使得被包含在其中的组件可以滑动，并且滑动后可以弹回到开始滑动的位置

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XScrollView 自定义组件，使得被包含在其中的组件可以滑动，并且滑动后可以弹回到开始滑动的位置XScrollView

package org.busyboy.view;import android.content.Context;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.widget.LinearLayout;public class XScrollView extends LinearLayout  {private float mLastY = 1;  private String TAG = XScrollView.class.getName();private float margin =0 ;private final static float OFFSET_RADIO = 1.8f;public XScrollView(Context context) {super(context);}public XScrollView(Context context, AttributeSet attrs) {super(context, attrs);}@Overridepublic boolean onTouchEvent(MotionEvent ev) {if (mLastY == -1) {mLastY = ev.getRawY();}switch (ev.getAction()) {case MotionEvent.ACTION_DOWN:mLastY = ev.getRawY();break;case MotionEvent.ACTION_MOVE:final float deltaY = ev.getRawY() - mLastY;mLastY = ev.getRawY();margin += deltaY;updateHeaderHeight(margin);break;default:mLastY = -1; // resetresetHeaderHeight();break;}return true;}private void resetHeaderHeight() {Log.e(TAG , "resetHeaderHeight");Log.e(TAG , "count:"+this.getChildCount());View  child = this.getChildAt(0);LinearLayout.LayoutParams param = (LayoutParams) child.getLayoutParams();param.topMargin = 0;child.setLayoutParams(param);margin=0;}private void updateHeaderHeight(float f) {Log.e(TAG , "updateHeaderHeight");Log.e(TAG , "count:"+this.getChildCount());View  child = this.getChildAt(0);LinearLayout.LayoutParams param = (LayoutParams) child.getLayoutParams();param.topMargin = (int) (f*OFFSET_RADIO);child.setLayoutParams(param);}}

Demo:

<?xml version="1.0" encoding="utf-8"?><org.busyboy.view.XScrollView xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/xListView"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:background="#ff0000"    android:orientation="vertical" >    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:background="#f0f0f0"        android:gravity="center"        android:orientation="vertical" >        <ImageView            android:id="@+id/iv"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginBottom="20dp"            android:src="@drawable/ic_launcher" />        <EditText            android:id="@+id/username"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginBottom="10dp"            android:ems="10"            android:hint="@string/username" >            <requestFocus />        </EditText>        <EditText            android:id="@+id/pass"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginBottom="10dp"            android:ems="10"            android:hint="@string/pass"            android:inputType="textPassword" />        <Button            android:id="@+id/login"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginBottom="10dp"            android:text="@string/login" />    </LinearLayout></org.busyboy.view.XScrollView>

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