一、前言
老规矩，别的不说，这demo是找了很相关知识集合而成的，可以说对我这种小白来说是绞尽脑汁！程序员讲的是无图无真相！
现在大家一睹为快！
二、比较关键的还是scroller这个类的
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package com.icq.slideview.view;
import android.content.context;
import android.util.attributeset;
import android.util.log;
import android.util.typedvalue;
import android.view.motionevent;
import android.view.view;
import android.widget.linearlayout;
import android.widget.relativelayout;
import android.widget.scroller;
import android.widget.textview;
import com.icq.slideview.r;
public class slideview extends linearlayout {
private static final string tag = slideview;
private context mcontext;
private linearlayout mviewcontent;
private relativelayout mholder;
private scroller mscroller;
private onslidelistener monslidelistener;
private int mholderwidth = 120;
private int mlastx = 0;
private int mlasty = 0;
private static final int tan = 2;
public interface onslidelistener {
public static final int slide_status_off = 0;
public static final int slide_status_start_scroll = 1;
public static final int slide_status_on = 2;
/**
* @param view current slideview
* @param status slide_status_on or slide_status_off
*/
public void onslide(view view, int status);
}
public slideview(context context) {
super(context);
initview();
}
public slideview(context context, attributeset attrs) {
super(context, attrs);
initview();
}
private void initview() {
mcontext = getcontext();
mscroller = new scroller(mcontext);
setorientation(linearlayout.horizontal);
view.inflate(mcontext, r.layout.slide_view_merge, this);
mviewcontent = (linearlayout) findviewbyid(r.id.view_content);
mholderwidth = math.round(typedvalue.applydimension(
typedvalue.complex_unit_dip, mholderwidth, getresources()
.getdisplaymetrics()));
}
public void setbuttontext(charsequence text) {
((textview)findviewbyid(r.id.delete)).settext(text);
}
public void setcontentview(view view) {
mviewcontent.addview(view);
}
public void setonslidelistener(onslidelistener onslidelistener) {
monslidelistener = onslidelistener;
}
public void shrink() {
if (getscrollx() != 0) {
this.smoothscrollto(0, 0);
}
}
public void onrequiretouchevent(motionevent event) {
int x = (int) event.getx();
int y = (int) event.gety();
int scrollx = getscrollx();
log.d(tag, x= + x + y= + y);
switch (event.getaction()) {
case motionevent.action_down: {
int deltax = x - mlastx;
system.out.println(按下偏移+deltax);
if (!mscroller.isfinished()) {
mscroller.abortanimation();
}
if (monslidelistener != null) {
monslidelistener.onslide(this,
onslidelistener.slide_status_start_scroll);
}
break;
}
case motionevent.action_move: {
int deltax = x - mlastx;
int deltay = y - mlasty;
system.out.println(偏移+deltax);
if (math.abs(deltax) < math.abs(deltay) * tan) {
break;
}
int newscrollx = scrollx - deltax;
if (deltax != 0) {
if (newscrollx < 0) {
newscrollx = 0;
} else if (newscrollx > mholderwidth) {
newscrollx = mholderwidth;
}
this.scrollto(newscrollx, 0);
}
break;
}
case motionevent.action_up: {
int newscrollx = 0;
if (scrollx - mholderwidth * 0.75 > 0) {
newscrollx = mholderwidth;
}
this.smoothscrollto(newscrollx, 0);
if (monslidelistener != null) {
monslidelistener.onslide(this,
newscrollx == 0 ? onslidelistener.slide_status_off
: onslidelistener.slide_status_on);
}
break;
}
default:
break;
}
mlastx = x;
mlasty = y;
}
private void smoothscrollto(int destx, int desty) {
// 缓慢滚动到指定位置
int scrollx = getscrollx();
int delta = destx - scrollx;
system.out.println(偏移scrollx+scrollx);
system.out.println(偏移差delta+delta);
int a= math.abs(delta) * 3;
system.out.println(什么意思+a);
mscroller.startscroll(scrollx, 0, delta, 0, math.abs(delta) * 3);
invalidate();
}
@override
public void computescroll() {
if (mscroller.computescrolloffset()) {
system.out.println(当前x位置：+mscroller.getcurrx());
system.out.println(当前y位置：+mscroller.getcurry());
scrollto(mscroller.getcurrx(), mscroller.getcurry());
postinvalidate();
}
}
}
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