Android仿网易一元夺宝客户端下拉加载动画效果(一)

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context=".aty.mainactivity"> 
<location.haidian.com.wypulltoreflush.view.ngimgview 
android:id="@+id/ngimg_main" 
android:layout_width="match_parent" 
android:layout_height="match_parent"/> 
<imageview 
android:id="@+id/img_main_sun" 
android:layout_width="50dp" 
android:layout_height="50dp" 
android:layout_centerhorizontal="true" 
android:layout_margintop="5dp" 
android:src="@drawable/ic_sun1"/> 
<linearlayout 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:background="#00123456" 
android:orientation="vertical"> 
<relativelayout 
android:layout_width="match_parent" 
android:layout_height="55dp" 
android:background="#ff4081"> 
</relativelayout> 
<view 
android:layout_width="match_parent" 
android:layout_height="0.5dp" 
android:background="@android:color/darker_gray"></view> 
<location.haidian.com.wypulltoreflush.view.ngreflashlistview 
android:id="@+id/lv_main" 
android:layout_width="fill_parent" 
android:layout_height="0dp" 
android:layout_weight="1" 
android:cachecolorhint="#00000000" 
/> 
</linearlayout> 
</relativelayout>

package location.haidian.com.wypulltoreflush.view; 
import android.content.context; 
import android.util.attributeset; 
import android.view.layoutinflater; 
import android.view.motionevent; 
import android.view.view; 
import android.view.viewgroup; 
import android.widget.abslistview; 
import android.widget.abslistview.onscrolllistener; 
import android.widget.listview; 
import location.haidian.com.wypulltoreflush.r; 
public class ngreflashlistview extends listview implements onscrolllistener { 
private view header; 
private int headerheight; 
private int firstvisibleitem; 
private int scrollstate; 
private final int none = 0; 
private final int pull = 1; 
private final int relese = 2; 
private final int reflashing = 3; 
public ngreflashlistview(context context) { 
super(context); 
initview(context); 
} 
public ngreflashlistview(context context, attributeset attrs) { 
super(context, attrs); 
initview(context); 
} 
public ngreflashlistview(context context, attributeset attrs, int defstyle) { 
super(context, attrs, defstyle); 
initview(context); 
} 
/** 
* @param context 
*/ 
private void initview(context context) { 
layoutinflater inflater = layoutinflater.from(context); 
header = inflater.inflate(r.layout.layout_heard, null); 
measureview(header); 
headerheight = header.getmeasuredheight(); 
toppadding(-headerheight); 
this.addheaderview(header); 
this.setonscrolllistener(this); 
} 
/** 
* @param view 
*/ 
private void measureview(view view) { 
viewgroup.layoutparams p = view.getlayoutparams(); 
if (p == null) { 
p = new viewgroup.layoutparams(viewgroup.layoutparams.match_parent, 
viewgroup.layoutparams.wrap_content); 
} 
int width = viewgroup.getchildmeasurespec(0, 0, p.width); 
int height; 
int tempheight = p.height; 
if (tempheight > 0) { 
height = measurespec.makemeasurespec(tempheight, 
measurespec.exactly); 
} else { 
height = measurespec.makemeasurespec(0, measurespec.unspecified); 
} 
view.measure(width, height); 
} 
/** 
* @param toppadding 
*/ 
private void toppadding(int toppadding) { 
header.setpadding(header.getpaddingleft(), toppadding, 
header.getpaddingright(), header.getpaddingbottom()); 
header.invalidate(); 
} 
@override 
public void onscroll(abslistview view, int firstvisibleitem, 
int visibleitemcount, int totalitemcount) { 
this.firstvisibleitem = firstvisibleitem; 
} 
@override 
public void onscrollstatechanged(abslistview view, int scrollstate) { 
this.scrollstate = scrollstate; 
} 
boolean isremark;//初始化标识 
int starty; 
int state; 
@override 
public boolean ontouchevent(motionevent ev) { 
switch (ev.getaction()) { 
case motionevent.action_down: 
if (firstvisibleitem == 0) { 
onrlvscrolllistener.onscrollychangged(0, 0); 
isremark = true; 
starty = (int) ev.gety(); 
} 
break; 
case motionevent.action_move: 
onmove(ev); 
break; 
case motionevent.action_up: 
if (state == relese) { 
onrlvscrolllistener.onscrollychangged(0, 3); 
state = reflashing; 
reflashviewbystate(); 
//ireflashlistener.onreflash(); 
} else if (state == pull) { 
state = none; 
onrlvscrolllistener.onscrollychangged(0, 0); 
isremark = false; 
reflashviewbystate(); 
} 
break; 
} 
return super.ontouchevent(ev); 
} 
int space; //间距 
int toppadding; //headview距离顶端的距离，初始-200 
/** 
* @param ev 
*/ 
private void onmove(motionevent ev) { 
if (!isremark) { 
return; 
} 
int tempy = (int) ev.gety(); 
space = tempy - starty; 
if (space >= 230) { 
space = 230; 
} 
toppadding = space - headerheight; 
onrlvscrolllistener.onscrollychangged(space, state); 
switch (state) { 
case none: 
if (space > 0) { 
state = pull; 
reflashviewbystate(); 
} 
break; 
case pull: 
toppadding(toppadding); 
if (space == headerheight + 30 
&& scrollstate == scroll_state_touch_scroll) { 
state = relese; 
reflashviewbystate(); 
} 
break; 
case relese: 
if (space < headerheight + 30) { 
state = pull; 
reflashviewbystate(); 
} else if (space <= 0) { 
state = none; 
isremark = false; 
reflashviewbystate(); 
} 
break; 
} 
} 
/** 
* 控制下拉刷新的图像文字显示 
*/ 
private void reflashviewbystate() { 
switch (state) { 
case none: 
//缓慢滑上去 
toppadding(-headerheight); 
break; 
case pull: 
break; 
case relese: 
break; 
case reflashing: 
break; 
} 
} 
/** 
* 刷新完成 
*/ 
public void reflashcomplete() { 
state = none; 
onrlvscrolllistener.onscrollychangged(0, state); 
isremark = false; 
reflashviewbystate(); 
} 
//绘制背景的接口 
public interface onrlvscrolllistener { 
void onscrollychangged(int y, int state); 
} 
private onrlvscrolllistener onrlvscrolllistener; 
public void setonrlvscrolllistener(onrlvscrolllistener onrlvscrolllistener) { 
this.onrlvscrolllistener = onrlvscrolllistener; 
} 
}

package location.haidian.com.wypulltoreflush.view; 
import android.content.context; 
import android.graphics.bitmap; 
import android.graphics.canvas; 
import android.graphics.color; 
import android.graphics.paint; 
import android.graphics.rectf; 
import android.graphics.drawable.bitmapdrawable; 
import android.util.attributeset; 
import android.util.log; 
import android.widget.imageview; 
import location.haidian.com.wypulltoreflush.r; 
/** 
* created by nangua on 2016/8/28. 
*/ 
public class ngimgview extends imageview implements ngreflashlistview.onrlvscrolllistener { 
private float scale; 
private final int none = 0; 
private final int pull = 1; 
private final int relese = 2; 
private final int reflashing = 3; 
public int state = 0; 
private float with; //屏幕总宽 
private float scrolly; 
private bitmap sun0; 
public float time = 0; 
public ngimgview(context context, attributeset attrs) { 
super(context, attrs); 
initview(); 
} 
private void initview() { 
sun0 = ((bitmapdrawable) getresources().getdrawable(r.drawable.ic_sun0)).getbitmap(); 
scale = this.getresources().getdisplaymetrics().density; 
} 
@override 
protected void ondraw(canvas canvas) { 
paint paint = new paint(); 
paint.setantialias(true);//抗锯齿 
paint.setcolor(color.parsecolor("#c4885a")); 
log.d("xiaojingyu","state:" + state); 
if (state!=3) { 
time = 0; //重置时间 
//画两只球球手 
canvas.drawcircle(with / 2 - 40 * scale, 55 * scale, 5 * scale, paint); 
canvas.drawcircle(with / 2 + 40 * scale, 55 * scale, 5 * scale, paint); 
//画笑脸 
canvas.drawbitmap(sun0, 
null, 
new rectf(with / 2 - 50, 
55 * scale + scrolly - (scrolly / 230) * 50, 
with / 2 + 50, 
55 * scale + scrolly - (scrolly / 230) * 50 + 100), 
null 
); 
//画手臂 
paint.setstrokewidth(1); 
canvas.drawline(with / 2 - 40 * scale, 55 * scale, 
with / 2 - 50, 55 * scale + scrolly, 
paint 
); 
canvas.drawline(with / 2 + 40 * scale, 55 * scale, 
with / 2 + 50, 55 * scale + scrolly, 
paint 
); 
} else if (state == 3) { 
//1秒钟拉上去，2秒钟旋转 
//第一秒 
if (time < 30) { 
time += 1; 
//画两只球球手 
canvas.drawcircle(with / 2 - 40 * scale, 55 * scale, 5 * scale, paint); 
canvas.drawcircle(with / 2 + 40 * scale, 55 * scale, 5 * scale, paint); 
//画笑脸 
canvas.drawbitmap(sun0, 
null, 
new rectf(with / 2 - 50, 
55 * scale + 180 - (time / 30) * 230, 
with / 2 + 50, 
55 * scale + 280 - (time / 30) * 230), 
null 
); 
//画手臂 
paint.setstrokewidth(1); 
canvas.drawline(with / 2 - 40 * scale, 55 * scale, 
with / 2 - 50, 
55 * scale + 230 - (time / 30) * 230, 
paint 
); 
canvas.drawline(with / 2 + 40 * scale, 55 * scale, 
with / 2 + 50, 
55 * scale + 230 - (time / 30) * 230, 
paint 
); 
postinvalidatedelayed(1); 
} else { 
if (!isbeginmainanimation) { 
isbeginmainanimation = true; 
ireflashlistener.onreflash(); 
} 
} 
} 
super.ondraw(canvas); 
} 
public static boolean isbeginmainanimation = false; 
@override 
protected void onlayout(boolean changed, int left, int top, int right, int bottom) { 
super.onlayout(changed, left, top, right, bottom); 
with = this.getwidth(); 
} 
@override 
public void onscrollychangged(int y, int state) { 
this.state = state; 
switch (state) { 
case none: 
break; 
case pull: 
//下拉 
scrolly = y; 
break; 
case relese: 
break; 
case reflashing: 
break; 
} 
} 
private ireflashlistener ireflashlistener; //回调接口 
public void setinterface(ireflashlistener ireflashlistener) { 
this.ireflashlistener = ireflashlistener; 
} 
/** 
* @author administrator 
*/ 
public interface ireflashlistener { 
void onreflash(); 
} 
}