Android编程实现ListView头部ViewPager广告轮询图效果

本文实例讲述了android编程实现listview头部viewpager广告轮询图效果。分享给大家供大家参考，具体如下：

之前看了别人的一些软件，发现其广告图轮询的时候，那个广告感觉和viewpager的效果不太一样，后来也查了一下，是因为时间问题，找了一些资料，自己也实践一下。

1、为了解决listview头部加viewpager滑动冲突问题，必须自定义listview，重写里面的onintercepttouchevent方法，listview代码如下：

package com.example.testa; 
import android.content.context; 
import android.util.attributeset; 
import android.view.motionevent; 
import android.widget.listview; 
public class definedlistview extends listview { 
 public definedlistview(context context) { 
  super(context); 
 } 
 public definedlistview(context context, attributeset attrs) { 
  super(context, attrs); 
 } 
 public definedlistview(context context, attributeset attrs, int defstyle) {
  super(context, attrs, defstyle); 
 } 
 private float xdistance, ydistance, xlast, ylast; 
 @override 
 public boolean onintercepttouchevent(motionevent ev) { 
  switch (ev.getaction()) { 
   case motionevent.action_down: 
    xdistance = ydistance = 0f; 
    xlast = ev.getx(); 
    ylast = ev.gety(); 
    break; 
   case motionevent.action_move: 
    final float curx = ev.getx(); 
    final float cury = ev.gety(); 
    xdistance += math.abs(curx - xlast); 
    ydistance += math.abs(cury - ylast); 
    xlast = curx; 
    ylast = cury; 
    if (xdistance > ydistance) { 
     return false; 
    } 
  } 
  return super.onintercepttouchevent(ev); 
 } 
}

2、为了让广告轮询的速度减慢，必须重新设置viewpager的scroller，自定义的scroller如下：

package com.example.testa; 
import java.lang.reflect.field; 
import android.annotation.suppresslint; 
import android.content.context; 
import android.os.handler; 
import android.support.v4.app.fragmentactivity; 
import android.support.v4.view.viewpager; 
import android.view.layoutinflater; 
import android.view.motionevent; 
import android.view.view; 
import android.view.view.ontouchlistener; 
import android.view.animation.interpolator; 
import android.widget.scroller; 
public class definedscroller extends scroller { 
 private int duration_time = 1000; 
 private boolean shouldautoscroll = true; 
 private viewpager viewpager = null; 
 @suppresslint("handlerleak") 
 private final handler handler = new handler() { 
  public void handlemessage(android.os.message msg) { 
   if (shouldautoscroll) { 
    viewpager.setcurrentitem(viewpager.getcurrentitem() + 1); 
    handler.sendemptymessagedelayed(0, 2000); 
   } 
  }; 
 }; 
 public definedscroller(context context) { 
  super(context); 
 } 
 public definedscroller(context context, interpolator interpolator) { 
  super(context, interpolator); 
 } 
 private view initviewpager(context context) { 
  view view = layoutinflater.from(context).inflate(r.layout.view_pager_layout, null);
  this.viewpager = (viewpager) view.findviewbyid(r.id.viewpager);
  this.viewpager.setoffscreenpagelimit(2); 
  this.viewpager.setadapter(new myfragmentpageradapter(((fragmentactivity) context).getsupportfragmentmanager())); 
  return view; 
 } 
 public viewpager getviewpager() { 
  return viewpager; 
 } 
 public view initview(context context) { 
  view view = initviewpager(context); 
  this.viewpager.setontouchlistener(new ontouchlistener() { 
   @override 
   public boolean ontouch(view v, motionevent event) { 
    if (event.getaction() == motionevent.action_up) { 
     shouldautoscroll = true; 
     handler.sendemptymessagedelayed(0, 2000); 
    } else { 
     handler.removemessages(0); 
     shouldautoscroll = false; 
    } 
    return false; 
   } 
  }); 
  try { 
   field mscroller = viewpager.class.getdeclaredfield("mscroller"); 
   mscroller.setaccessible(true); 
   mscroller.set(viewpager, this); 
  } catch (nosuchfieldexception e) { 
  } catch (illegalargumentexception e) { 
  } catch (illegalaccessexception e) { 
  } 
  handler.sendemptymessagedelayed(0, 2000); 
  return view; 
 } 
 public void setshouldautoscroll() { 
  handler.removemessages(0); 
  if (viewpager.isshown()) { 
   shouldautoscroll = true; 
   handler.sendemptymessagedelayed(0, 2000); 
  } else { 
   shouldautoscroll = false; 
  } 
 } 
 @override 
 public void startscroll(int startx, int starty, int dx, int dy, int duration) { 
  super.startscroll(startx, starty, dx, dy, shouldautoscroll ? duration_time : duration); 
 } 
}

关键是startscroll方法啦

3、其他测试类，

（1）testfragment：

package com.example.testa; 
import android.os.bundle; 
import android.support.v4.app.fragment; 
import android.view.layoutinflater; 
import android.view.view; 
import android.view.viewgroup; 
import android.widget.imageview; 
public class testfragment extends fragment { 
 public int imageresource = 0; 
 public static testfragment newinstance(int imageresource) { 
  testfragment newfragment = new testfragment(); 
  newfragment.imageresource = imageresource; 
  return newfragment; 
 } 
 @override 
 public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { 
  view view = inflater.inflate(r.layout.pager_layout, null); 
  imageview textview = (imageview) view.findviewbyid(r.id.image); 
  textview.setimageresource(imageresource); 
  return view; 
 } 
}

（2）viewpager的adapter类：

package com.example.testa; 
import android.support.v4.app.fragment; 
import android.support.v4.app.fragmentmanager; 
import android.support.v4.app.fragmentstatepageradapter; 
public class myfragmentpageradapter extends fragmentstatepageradapter { 
 public myfragmentpageradapter(fragmentmanager fm) { 
  super(fm); 
 } 
 @override 
 public int getcount() { 
  return integer.max_value; 
 } 
 @override 
 public fragment getitem(int arg0) { 
  switch (arg0 % 4) { 
   case 0: 
    return testfragment.newinstance(r.drawable.a1); 
   case 1: 
    return testfragment.newinstance(r.drawable.default_wh); 
   case 2: 
    return testfragment.newinstance(r.drawable.default_ww); 
   case 3: 
    return testfragment.newinstance(r.drawable.test); 
   default: 
    return testfragment.newinstance(r.drawable.a1); 
  } 
 } 
}

（3）测试的activity：

package com.example.testa; 
import java.util.arraylist; 
import java.util.list; 
import android.os.bundle; 
import android.support.v4.app.fragmentactivity; 
import android.view.layoutinflater; 
import android.view.view; 
import android.view.viewgroup; 
import android.widget.abslistview; 
import android.widget.abslistview.onscrolllistener; 
import android.widget.adapterview; 
import android.widget.adapterview.onitemclicklistener; 
import android.widget.baseadapter; 
import android.widget.textview; 
public class mainactivity extends fragmentactivity { 
 private definedlistview listview = null; 
 private list<string> list = null; 
 private definedscroller definedscroller = null; 
 @override 
 protected void oncreate(bundle savedinstancestate) { 
  super.oncreate(savedinstancestate); 
  setcontentview(r.layout.activity_main); 
  listview = (definedlistview) findviewbyid(r.id.listview); 
  initlistdata(); 
  initviewpager(); 
  listview.setadapter(new listadapter()); 
  listview.setonitemclicklistener(new onitemclicklistener() { 
   @override 
   public void onitemclick(adapterview<?> parent, view view, int position, long id) { 
    definedscroller.getviewpager().setcurrentitem(definedscroller.getviewpager().getcurrentitem() + 1); 
   } 
  }); 
  listview.setonscrolllistener(new onscrolllistener() { 
   @override 
   public void onscrollstatechanged(abslistview view, int scrollstate) { 
    if (scrollstate == scroll_state_idle) { 
     definedscroller.setshouldautoscroll(); 
    } 
   } 
   @override 
   public void onscroll(abslistview view, int firstvisibleitem, int visibleitemcount, int totalitemcount) { 
   } 
  }); 
 } 
 private void initlistdata() { 
  list = new arraylist<string>(); 
  for (int i = 1; i <= 20; ++i) { 
   list.add("test" + i); 
  } 
 } 
 private void initviewpager() { 
  definedscroller = new definedscroller(this); 
  listview.addheaderview(definedscroller.initview(this)); 
 } 
 private class listadapter extends baseadapter { 
  @override 
  public int getcount() { 
   return list.size(); 
  } 
  @override 
  public object getitem(int position) { 
   return list.get(position); 
  } 
  @override 
  public long getitemid(int position) { 
   return position; 
  } 
  @override 
  public view getview(int position, view convertview, viewgroup parent) {
   textview textview = (textview) layoutinflater.from(mainactivity.this).inflate(r.layout.text_view_layout, 
     null); 
   textview.setpadding(20, 20, 20, 20); 
   textview.settext(list.get(position)); 
   return textview; 
  } 
 } 
}

4、布局文件就算了吧

上面有些是在别的地方看到的，很久了，忘记在哪里看到的了，就写不上源地址了，敬请见谅。

希望本文所述对大家android程序设计有所帮助。