仿qq侧滑删除效果图
自定义listview
public class dragdellistview extends listview {
private boolean moveable=false;
private boolean closed=true;
private float mdownx,mdowny;
private int mtouchposition,oldposition=-1;
private dragdelitem mtouchview,oldview;
private context context;
public dragdellistview(context context) {
super(context);
init(context);
}
public dragdellistview(context context, attributeset attrs, int defstyle) {
super(context, attrs, defstyle);
init(context);
}
public dragdellistview(context context, attributeset attrs) {
super(context, attrs);
init(context);
}
private void init(context context) {
this.context=context;
}
@override
public boolean ontouchevent(motionevent ev) {
switch (ev.getaction()) {
case motionevent.action_down:
mtouchposition = pointtoposition((int) ev.getx(), (int) ev.gety());
mtouchview=(dragdelitem)getchildat(mtouchposition - getfirstvisibleposition());
mdownx = ev.getx();
mdowny=ev.gety();
if(oldposition==mtouchposition ||closed)
{
moveable=true;
mtouchview.mdownx =(int)mdownx;
}else
{
moveable=false;
if(oldview!=null)
{
oldview.smoothclosemenu();
}
}
oldposition=mtouchposition;
oldview=mtouchview;
break;
case motionevent.action_move:
if (math.abs(mdownx-ev.getx()) < math.abs(mdowny-ev.gety()) * dp2px(2)) {
break;
}
if (moveable)
{
int dis = (int) (mtouchview.mdownx -ev.getx());
if(mtouchview.state==mtouchview.state_open)
dis+=mtouchview.mmenuview.getwidth();
mtouchview.swipe(dis);
ev.setaction(motionevent.action_cancel);
}
break;
case motionevent.action_up:
if (moveable)
{
if ((mtouchview.mdownx -ev.getx()) > (mtouchview.mmenuview.getwidth()/2)) {
// open
mtouchview.smoothopenmenu();
closed=false;
} else {
// close
mtouchview.smoothclosemenu();
closed=true;
}
ev.setaction(motionevent.action_cancel);
}
break;
}
return super.ontouchevent(ev);
}
private int dp2px(int dp) {
return (int) typedvalue.applydimension(typedvalue.complex_unit_dip, dp,
getcontext().getresources().getdisplaymetrics());
}
}
自定义滑动条目
public class dragdelitem extends linearlayout {
public static final int state_close = 0;
public static final int state_open = 1;
private view mcontentview;
public view mmenuview;
public int mdownx;
public int state = state_close;
public boolean isfling;
private int mbasex;
private scroller scroll;
public dragdelitem(view contentview, view menuview) {
super(contentview.getcontext());
scroll=new scroller(getcontext());
mcontentview = contentview;
mmenuview = menuview;
init();
}
private dragdelitem(context context, attributeset attrs) {
super(context, attrs);
}
private dragdelitem(context context) {
super(context);
}
private void init() {
setlayoutparams(new abslistview.layoutparams(layoutparams.match_parent,
layoutparams.wrap_content));
layoutparams contentparams = new layoutparams(
layoutparams.wrap_content, layoutparams.wrap_content);
mcontentview.setlayoutparams(contentparams);
mmenuview.setlayoutparams(new layoutparams(layoutparams.wrap_content,
layoutparams.wrap_content));
addview(mcontentview);
addview(mmenuview);
}
public void swipe(int dis) {
if (dis > mmenuview.getwidth()) {
dis = mmenuview.getwidth();
}
if (dis < 0) {
dis = 0;
}
mcontentview.layout(-dis, mcontentview.gettop(),
mcontentview.getwidth() - dis, getmeasuredheight());
mmenuview.layout(mcontentview.getwidth() - dis, mmenuview.gettop(),
mcontentview.getwidth() + mmenuview.getwidth() - dis,
mmenuview.getbottom());
}
@override
public void computescroll() {
if (state == state_open) {
if (scroll.computescrolloffset()) {
swipe(scroll.getcurrx());
postinvalidate();
}
} else {
if (scroll.computescrolloffset()) {
swipe(mbasex - scroll.getcurrx());
postinvalidate();
}
}
}
public void smoothclosemenu() {
state = state_close;
mbasex = -mcontentview.getleft();
scroll.startscroll(0, 0, mbasex, 0, 350);
postinvalidate();
}
public void smoothopenmenu() {
state = state_open;
scroll.startscroll(-mcontentview.getleft(), 0,
mmenuview.getwidth()/2, 0, 350);
postinvalidate();
}
@override
protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
super.onmeasure(widthmeasurespec, heightmeasurespec);
mmenuview.measure(measurespec.makemeasurespec(0,
measurespec.unspecified), measurespec.makemeasurespec(
getmeasuredheight(), measurespec.exactly));
mcontentview.measure(measurespec.makemeasurespec(0,
measurespec.unspecified), measurespec.makemeasurespec(
getmeasuredheight(), measurespec.exactly));
}
@override
protected void onlayout(boolean changed, int l, int t, int r, int b) {
mcontentview.layout(0, 0, getmeasuredwidth(),
mcontentview.getmeasuredheight());
mmenuview.layout(getmeasuredwidth(), 0,
getmeasuredwidth() + mmenuview.getmeasuredwidth(),
mcontentview.getmeasuredheight());
}
}
所用到的布局文件
—swipecontent.xml代码
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rl_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#999999"
android:padding="8dp" >
<imageview
android:id="@+id/iv_icon"
android:layout_width="50dp"
android:layout_height="50dp"
android:src="@drawable/ic_launcher" />
<textview
android:id="@+id/tv_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centervertical="true"
android:layout_marginleft="10dp"
android:layout_torightof="@+id/iv_icon"
android:text="name"
android:textcolor="@android:color/black"
android:textsize="18sp" />
</relativelayout>
—swipemenu.xml代码
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal"
>
<textview
android:id="@+id/tv_open"
android:layout_width="90dp"
android:layout_height="match_parent"
android:gravity="center"
android:background="#c2c2c2"
android:text="置顶"
android:textcolor="@android:color/white"
android:textsize="18sp" />
<textview
android:id="@+id/tv_del"
android:layout_width="90dp"
android:layout_height="match_parent"
android:gravity="center"
android:background="#ff0000"
android:text="删除"
android:textcolor="@android:color/white"
android:textsize="18sp" />
</linearlayout>
主界面代码
public class mainactivity extends activity {
private list<applicationinfo> mapplist;
private dragdellistview mlistview;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_list);
mapplist = getpackagemanager().getinstalledapplications(0);
mlistview = (dragdellistview) findviewbyid(r.id.listview);
mlistview.setadapter(new appadapter(mapplist));
}
class appadapter extends baseadapter {
private list<applicationinfo> mapplist;
public appadapter(list<applicationinfo> applist)
{
mapplist=applist;
}
@override
public int getcount() {
return mapplist.size();
}
@override
public applicationinfo getitem(int position) {
return mapplist.get(position);
}
@override
public long getitemid(int position) {
return position;
}
@override
public view getview(final int position, view convertview, viewgroup parent) {
viewholder holder=null;
view menuview=null;
if (convertview == null) {
convertview = view.inflate(getapplicationcontext(),
r.layout.swipecontent, null);
menuview = view.inflate(getapplicationcontext(),
r.layout.swipemenu, null);
convertview = new dragdelitem(convertview,menuview);
holder=new viewholder(convertview);
} else {
holder = (viewholder) convertview.gettag();
}
applicationinfo item = getitem(position);
holder.iv_icon.setimagedrawable(item.loadicon(getpackagemanager()));
holder.tv_name.settext(item.loadlabel(getpackagemanager()));
holder.tv_open.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view arg0) {
toast.maketext(mainactivity.this, "置顶:"+position, toast.length_short).show();
}
});
holder.tv_del.setonclicklistener(new view.onclicklistener() {
@override
public void onclick(view arg0) {
toast.maketext(mainactivity.this, "删除:"+position, toast.length_short).show();
}
});
return convertview;
}
class viewholder {
imageview iv_icon;
textview tv_name;
textview tv_open,tv_del;
relativelayout relativelayout;
public viewholder(view view) {
iv_icon = (imageview) view.findviewbyid(r.id.iv_icon);
tv_name = (textview) view.findviewbyid(r.id.tv_name);
tv_open=(textview)view.findviewbyid(r.id.tv_open);
tv_del=(textview)view.findviewbyid(r.id.tv_del);
relativelayout = (relativelayout) view.findviewbyid(r.id.rl_layout);
//改变relativelayout宽度
windowmanager wm = (windowmanager) getapplicationcontext().getsystemservice(context.window_service);
int width = wm.getdefaultdisplay().getwidth();
relativelayout.setminimumwidth(width-60);
view.settag(this);
}
}
}
}
主界面布局代码
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<com.draglistview.dragdellistview
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</relativelayout>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
更多android仿qq微信侧滑删除效果。