ios的列表拖动效果很人性化，当拖出界后也可以一直拖。安卓的只会过界后边缘发光，感觉好丑。于是开始查找。
1.安卓listview本身已经自带的
只需要重写overScrollBy
@Override
protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {
scrollRangeY = 200；//这边给个值，就可以拖过界
return super.overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent)
}这种方法亲身试过，简单的很，但是偶尔会回弹失效，不知道是不是我的测试机便宜货还是谷歌留的bug。
于是我没有使用这个。
2.组合控件的方式
这种方法用的也是比较多的,网上例子也不少，我这就不贴了。
3.自定义listview
以下是我的一些思路
graph TD
1=>start: 开始
1.5=>start: overScrollBy(获取越界状态)
2=>operation: onTouchEvent(拦截MotionEvent)
3=>condition: 继续拉(或推)
4=>operation: 抬起手指
5=>operation: onBound(回弹)
6=>end: 结束
7=>operation: 手动推(或拉)回原位
8=>operation: 释放MotionEvent
1->1.5->2->3
3(yes)->4->5->6
3(no)->7->8->6实例代码
package com.wb.widgets;
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.ListView;
/**
* Created by YiSD on 2015/12/5.
*/
public class BoundListView extends ListView {
public static int OVERSCROLL_STATE_NORMAL = 0;//正常
public static int OVERSCROLL_STATE_PULL = -1;//拉
public static int OVERSCROLL_STATE_PUSH = 1;//推
private int mOverScrollState = OVERSCROLL_STATE_NORMAL;
private float lastY = -1;//最近一次Y轴位置
/**
* 小于0-->pull,大于0-->push
*/
private int mOverY = 0;
public BoundListView(Context context) {
super(context);
}
public BoundListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public void setOverScrollMode(int mode) {
//去掉边缘发光效果
super.setOverScrollMode(OVER_SCROLL_NEVER);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()){
case MotionEvent.ACTION_DOWN:
if (mOverY < 0){
mOverScrollState = OVERSCROLL_STATE_PULL;
}else if (mOverY > 0){
mOverScrollState = OVERSCROLL_STATE_PUSH;
}
}
if (mOverScrollState != OVERSCROLL_STATE_NORMAL){
switch (ev.getAction()){
case MotionEvent.ACTION_UP:
mOverScrollState = OVERSCROLL_STATE_NORMAL;
onBound();
return true;
}
if (lastY < 0){
lastY = ev.getY();
}else {
if (Math.abs(ev.getY() - lastY) > 30){
lastY = ev.getY();
return true;
}
if (ev.getY() - lastY != 0){
if (mOverScrollState == OVERSCROLL_STATE_PULL){
mOverY -= (ev.getY() - lastY);
if (mOverY > 0){
mOverY = 0;
mOverScrollState = OVERSCROLL_STATE_NORMAL;
ev.setAction(MotionEvent.ACTION_DOWN);
super.onTouchEvent(ev);
}
}else if(mOverScrollState == OVERSCROLL_STATE_PUSH){
mOverY -= (ev.getY() - lastY);
if (mOverY < 0){
mOverY = 0;
mOverScrollState = OVERSCROLL_STATE_NORMAL;
ev.setAction(MotionEvent.ACTION_DOWN);
super.onTouchEvent(ev);
}
}
}
lastY = ev.getY();
invalidate();
}
return true;
}else {
return super.onTouchEvent(ev);
}
}
@Override
protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {
if(isTouchEvent){
if (deltaY < 0){
mOverScrollState = OVERSCROLL_STATE_PULL;
}else {
mOverScrollState = OVERSCROLL_STATE_PUSH;
}
mOverY += deltaY;
invalidate();
}
return true;
}
@Override
public void draw(Canvas canvas) {
canvas.translate(0,-mOverY/2);
super.draw(canvas);
}
/**
* 回弹归位
*/
private void onBound(){
final int during = 1000;
final int d = 10;
if (mOverY != 0){
new Thread(){
@Override
public void run() {
int flag = 1;
if (mOverY<0){
flag = -1;
mOverY = -mOverY;
}
int temp = mOverY;
int i = 0;
while (i < during && Math.abs(temp) >= 5 && mOverScrollState == OVERSCROLL_STATE_NORMAL){
try {
Thread.sleep(d);
} catch (InterruptedException e) {
e.printStackTrace();
}
i += d;
temp = (int) (Math.pow((double)i / during - 1, 2)*temp);
mOverY = flag*temp;
postInvalidate();
}
mOverY = 0;
postInvalidate();
}
}.start();
}
}
}