java - Listview with pull to refersh Scroll down to last item when adding header-view -
i have created 1 pull refresh listview when scroll or pull little bit have add header view.
here custom listview class
package com.app.refreshablelist; import android.content.context; import android.graphics.bitmap; import android.graphics.bitmap.config; import android.graphics.canvas; import android.graphics.drawable.drawable; import android.os.handler; import android.os.message; import android.util.attributeset; import android.view.layoutinflater; import android.view.motionevent; import android.view.view; import android.view.view.ontouchlistener; import android.view.viewconfiguration; import android.view.animation.animation; import android.view.animation.animationutils; import android.widget.imageview; import android.widget.linearlayout; import android.widget.listview; import android.widget.progressbar; import android.widget.textview; import com.app.xxxxxx.r; import com.google.android.gms.internal.el; public class refreshablelistview extends listview { boolean isscrool = false; private view mheadercontainer = null; private view mheaderview = null; private imageview marrow = null; private progressbar mprogress = null; private textview mtext = null; private float = 0; private float mhistoricaly = 0; private int mhistoricaltop = 0; private int minitialheight = 0; private boolean mflag = false; private boolean marrowup = false; private boolean misrefreshing = false; private int mheaderheight = 0; private onrefreshlistener mlistener = null; private static final int refresh = 0; private static final int normal = 1; private static final int header_height_dp = 62; private static final string tag = refreshablelistview.class.getsimplename(); private listviewobserver mobserver; private view mtrackedchild; private int mtrackedchildprevposition; private int mtrackedchildprevtop; ontouchlistener touch; view vheader; @override protected void onscrollchanged(int l, int t, int oldl, int oldt) { super.onscrollchanged(l, t, oldl, oldt); if (mtrackedchild == null) { if (getchildcount() > 0) { mtrackedchild = getchildinthemiddle(); mtrackedchildprevtop = mtrackedchild.gettop(); mtrackedchildprevposition = getpositionforview(mtrackedchild); } } else { boolean childissafetotrack = mtrackedchild.getparent() == && getpositionforview(mtrackedchild) == mtrackedchildprevposition; if (childissafetotrack) { int top = mtrackedchild.gettop(); if (mobserver != null) { float deltay = top - mtrackedchildprevtop; mobserver.onscroll(deltay); } mtrackedchildprevtop = top; } else { mtrackedchild = null; } } } private view getchildinthemiddle() { return getchildat(getchildcount() / 2); } public void setobserver(listviewobserver observer) { mobserver = observer; } public refreshablelistview(final context context) { super(context); initialize(); } public refreshablelistview(final context context, final attributeset attrs) { super(context, attrs); initialize(); } public refreshablelistview(final context context, final attributeset attrs, final int defstyle) { super(context, attrs, defstyle); initialize(); } public void setonrefreshlistener(final onrefreshlistener l) { mlistener = l; } @override public void setontouchlistener(ontouchlistener l) { // todo auto-generated method stub super.setontouchlistener(l); } public void completerefreshing() { mprogress.setvisibility(view.invisible); marrow.setvisibility(view.visible); mhandler.sendmessage(mhandler.obtainmessage(normal, mheaderheight, 0)); misrefreshing = false; invalidateviews(); } @override public boolean onintercepttouchevent(final motionevent ev) { switch (ev.getaction()) { case motionevent.action_down: mhandler.removemessages(refresh); mhandler.removemessages(normal); = mhistoricaly = ev.gety(); if (mheadercontainer.getlayoutparams() != null) { minitialheight = mheadercontainer.getlayoutparams().height; } break; } return super.onintercepttouchevent(ev); } @override public boolean ontouchevent(final motionevent ev) { switch (ev.getaction()) { case motionevent.action_move: mhistoricaltop = getchildat(0).gettop(); break; case motionevent.action_up: if (!misrefreshing) { if (marrowup) { startrefreshing(); mhandler.sendmessage(mhandler.obtainmessage(refresh, (int) (ev.gety() - my) / 2 + minitialheight, 0)); } else { if (getchildat(0).gettop() == 0) { mhandler.sendmessage(mhandler.obtainmessage(normal, (int) (ev.gety() - my) / 2 + minitialheight, 0)); } } } else { mhandler.sendmessage(mhandler.obtainmessage(refresh, (int) (ev.gety() - my) / 2 + minitialheight, 0)); } mflag = false; break; } return super.ontouchevent(ev); } @override public boolean dispatchtouchevent(final motionevent ev) { if (ev.getaction() == motionevent.action_move && getfirstvisibleposition() == 0) { float direction = ev.gety() - mhistoricaly; int height = (int) (ev.gety() - my) / 2 + minitialheight; if (height < 0) { height = 0; } float deltay = math.abs(my - ev.gety()); viewconfiguration config = viewconfiguration.get(getcontext()); if (deltay > config.getscaledtouchslop()) { // scrolling downward if (direction > 0) { // refresh bar extended if top pixel of first item // visible if (getchildat(0) != null) { if (getchildat(0).gettop() == 0) { if (mhistoricaltop < 0) { // = ev.gety(); // todo works without // this?mhistoricaltop = 0; } // if (isscrool == true) { // // } else { // isscrool = true; // addheaderview(vheader); // // // animation anim = animationutils.loadanimation( // // getcontext(), r.anim.bounce_animation); // // startanimation(anim); // // smoothscrolltoposition(getchildat(0).gettop()); // // bottom_layout.setvisibility(view.visible); // } // extends refresh bar /***** * commented me on 10-09-2014 */ setheaderheight(height); // stop list scroll prevent list // overscrolling ev.setaction(motionevent.action_cancel); mflag = false; } } } else if (direction < 0) { // scrolling upward // refresh bar shortened if top pixel of first item // // visible if (getchildat(0) != null) { if (getchildat(0).gettop() == 0) { setheaderheight(height); // if scroll reaches top of list, list scroll // enabled if (getchildat(1) != null && getchildat(1).gettop() <= 1 && !mflag) { ev.setaction(motionevent.action_down); mflag = true; } } } } } mhistoricaly = ev.gety(); } try { return super.dispatchtouchevent(ev); } catch (exception e) { return false; } } @override public boolean performitemclick(final view view, final int position, final long id) { if (position == 0) { // refresh header element return true; } else { return super.performitemclick(view, position - 1, id); } } private void initialize() { layoutinflater inflator = (layoutinflater) getcontext() .getsystemservice(context.layout_inflater_service); vheader = inflator.inflate(r.layout.search_header, null); layoutinflater inflater = (layoutinflater) getcontext() .getsystemservice(context.layout_inflater_service); mheadercontainer = inflater.inflate(r.layout.refreshable_list_header, null); mheaderview = mheadercontainer .findviewbyid(r.id.refreshable_list_header); marrow = (imageview) mheadercontainer .findviewbyid(r.id.refreshable_list_arrow); mprogress = (progressbar) mheadercontainer .findviewbyid(r.id.refreshable_list_progress); mtext = (textview) mheadercontainer .findviewbyid(r.id.refreshable_list_text); addheaderview(mheadercontainer); mheaderheight = (int) (header_height_dp * getcontext().getresources() .getdisplaymetrics().density); setheaderheight(0); } private void setheaderheight(final int height) { if (height <= 1) { mheaderview.setvisibility(view.gone); } else { mheaderview.setvisibility(view.visible); } // extends refresh bar layoutparams lp = (layoutparams) mheadercontainer.getlayoutparams(); if (lp == null) { lp = new layoutparams(layoutparams.fill_parent, layoutparams.wrap_content); } lp.height = height; mheadercontainer.setlayoutparams(lp); // refresh bar shows bottom top linearlayout.layoutparams headerlp = (linearlayout.layoutparams) mheaderview .getlayoutparams(); if (headerlp == null) { headerlp = new linearlayout.layoutparams(layoutparams.fill_parent, layoutparams.wrap_content); } headerlp.topmargin = -mheaderheight + height; mheaderview.setlayoutparams(headerlp); if (!misrefreshing) { // if scroll reaches trigger line, start refreshing if (height > mheaderheight && !marrowup) { marrow.startanimation(animationutils.loadanimation( getcontext(), r.anim.rotate)); mtext.settext("release update"); rotatearrow(); marrowup = true; } else if (height < mheaderheight && marrowup) { marrow.startanimation(animationutils.loadanimation( getcontext(), r.anim.rotate)); mtext.settext("pull down update"); rotatearrow(); marrowup = false; }else { if (isscrool == true) { } else { isscrool = true; addheaderview(vheader); // animation anim = animationutils.loadanimation( // getcontext(), r.anim.bounce_animation); // startanimation(anim); smoothscrolltoposition(getchildat(0).gettop()); // bottom_layout.setvisibility(view.visible); } } } } private void rotatearrow() { drawable drawable = marrow.getdrawable(); bitmap bitmap = bitmap.createbitmap(drawable.getintrinsicwidth(), drawable.getintrinsicheight(), config.argb_8888); canvas canvas = new canvas(bitmap); canvas.save(); canvas.rotate(180.0f, canvas.getwidth() / 2.0f, canvas.getheight() / 2.0f); drawable.setbounds(0, 0, drawable.getintrinsicwidth(), drawable.getintrinsicheight()); drawable.draw(canvas); canvas.restore(); marrow.setimagebitmap(bitmap); } private void startrefreshing() { marrow.setvisibility(view.invisible); mprogress.setvisibility(view.visible); mtext.settext("loading..."); misrefreshing = true; if (mlistener != null) { mlistener.onrefresh(this); } } private final handler mhandler = new handler() { @override public void handlemessage(final message msg) { super.handlemessage(msg); int limit = 0; switch (msg.what) { case refresh: limit = mheaderheight; break; case normal: limit = 0; break; } // elastic scrolling if (msg.arg1 >= limit) { setheaderheight(msg.arg1); int displacement = (msg.arg1 - limit) / 10; if (displacement == 0) { mhandler.sendmessage(mhandler.obtainmessage(msg.what, msg.arg1 - 1, 0)); } else { mhandler.sendmessage(mhandler.obtainmessage(msg.what, msg.arg1 - displacement, 0)); } } } }; public interface onrefreshlistener { public void onrefresh(refreshablelistview listview); } public static interface listviewobserver { public void onscroll(float deltay); } } here in method dispatchtouchevent(final motionevent ev) have make 1 condition
if (isscrool == true) { } else { isscrool = true; addheaderview(vheader); // animation anim = // animationutils.loadanimation( // getcontext(), r.anim.bounce_animation); // startanimation(anim); smoothscrolltoposition(getchildat(0).gettop()); // bottom_layout.setvisibility(view.visible); } here addheaderview(vheader); adds header listview scroll down last item can tell me what's happening here?
try call listview.setselectionafterheaderview();. scroll listview top.
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