最主要就這個類：

package com.bluemagee.assistant.app;

import android.content.Context;

import android.graphics.Rect;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.View;

import android.view.animation.Animation;

import android.view.animation.TranslateAnimation;

import android.widget.ScrollView;

public class BounceScrollView extends ScrollView {

private boolean isCalled;

private Callback mCallback;

private View mView;

private Rect mRect = new Rect();

private int y;

private boolean isFirst = true;

public BounceScrollView(Context context, AttributeSet attrs) {

super(context, attrs);

}

@Override

protected void onFinishInflate() {

if (getChildCount() > 0)

mView = getChildAt(0);

super.onFinishInflate();

}

@Override

public boolean onTouchEvent(MotionEvent ev) {

if (mView != null) {

commonOnTouch(ev);

}

return super.onTouchEvent(ev);

}

private void commonOnTouch(MotionEvent ev) {

int action = ev.getAction();

int cy = (int) ev.getY();

switch (action) {

case MotionEvent.ACTION_DOWN:

break;

case MotionEvent.ACTION_MOVE:

int dy = cy - y;

if (isFirst) {

dy = 0;

isFirst = false;

}

y = cy;

if (isNeedMove()) {

if (mRect.isEmpty()) {

mRect.set(mView.getLeft(), mView.getTop(),

mView.getRight(), mView.getBottom());

}

mView.layout(mView.getLeft(), mView.getTop() + 2 * dy / 3,

mView.getRight(), mView.getBottom() + 2 * dy / 3);

if (shouldCallBack(dy)) {

if (mCallback != null) {

if (!isCalled) {

isCalled = true;

resetPosition();

mCallback.callback();

}

}

}

}

break;

case MotionEvent.ACTION_UP:

if (!mRect.isEmpty()) {

resetPosition();

}

break;

}

}

private boolean shouldCallBack(int dy) {

if (dy > 0 && mView.getTop() > getHeight() / 2)

return true;

return false;

}

private void resetPosition() {

Animation animation = new TranslateAnimation(0, 0, mView.getTop(),

mRect.top);

animation.setDuration(200);

animation.setFillAfter(true);

mView.startAnimation(animation);

mView.layout(mRect.left, mRect.top, mRect.right, mRect.bottom);

mRect.setEmpty();

isFirst = true;

isCalled = false;

}

public boolean isNeedMove() {

int offset = mView.getMeasuredHeight() - getHeight();

int scrollY = getScrollY();

if (scrollY == 0 || scrollY == offset) {

return true;

}

return false;

}

public void setCallBack(Callback callback) {

mCallback = callback;

}

public interface Callback

{

void callback();

}

}

總結

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