Android viewpager自动轮播和小圆点联动效果

本文实例为大家分享了android九宫格图片展示的具体代码，供大家参考，具体内容如下

首先来看一下我们要做成的而效果：

主页面要显示一个viewpager自动轮播+小圆点联动的效果 ：

废话不多说，直接上代码：

布局文件：

activity_main.xml：

<linearlayout 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"
  android:orientation="vertical" >

  <relativelayout
    android:layout_width="match_parent"
    android:layout_height="200dp" >

    <android.support.v4.view.viewpager
      android:id="@+id/main_vp"
      android:layout_width="match_parent"
      android:layout_height="200dp" >
    </android.support.v4.view.viewpager>

    <linearlayout
      android:id="@+id/ll_doc"
      android:layout_width="match_parent"
      android:layout_height="40dp"
      android:layout_alignparentbottom="true"
      android:gravity="center"
      android:orientation="horizontal" >
    </linearlayout>
  </relativelayout>

  <linearlayout
    android:layout_width="match_parent"
    android:layout_height="100dp" >
  </linearlayout>

  <linearlayout
    android:layout_width="match_parent"
    android:layout_height="80dp" >
  </linearlayout>

  <gridview
    android:id="@+id/main_gv"
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:numcolumns="2"
    >
  </gridview>

</linearlayout>

menu下的main.xml：

<menu xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  tools:context="com.example.monthextwo.mainactivity" >

  <item
    android:id="@+id/action_settings"
    android:orderincategory="100"
    android:showasaction="never"
    android:title="@string/action_settings"/>

</menu>

接下来看一下要用到的架包文件：

最后是java文件：

首先是com.example.monthextwo包中的mainactivity.java：

public class mainactivity extends activity {

  viewpager vp;
  dataresult data;
  list<imageview> list;
  list<imageview> list_doc;


  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);

    initview();
    initdata();
  }


  private void initview() {
    vp = (viewpager) findviewbyid(r.id.main_vp);
  }

  public void initdoc(){
    linearlayout ll_dco = (linearlayout) findviewbyid(r.id.ll_doc);
    list_doc = new arraylist<imageview>();
    if(data != null && data.getresult().getadvs().size() > 0){
      for (int i = 0; i < data.getresult().getadvs().size(); i++) {
        imageview iv = new imageview(this);
        layoutparams params = new layoutparams(layoutparams.wrap_content, layoutparams.wrap_content);
        params.rightmargin = 10;
        iv.setlayoutparams(params);
        if(i == 0){
          iv.setbackgroundresource(r.drawable.doc_check);
        }else{
          iv.setbackgroundresource(r.drawable.doc_uncheck);
        }
        ll_dco.addview(iv);
        list_doc.add(iv);
      }
    }
  }


  private void initdata() {
    new asynctask<string, string, string>(){

      @override
      protected string doinbackground(string... params) {
        string json = netutils.getnetdata("http://www.babybuy100.com/api/getshopoverview.ashx");
        gson gson = new gson();
        data = gson.fromjson(json, dataresult.class);
        log.i("=================", data.tostring());
        return null;
      }

      @override
      protected void onpostexecute(string result) {
        initvp();
        super.onpostexecute(result);
      }

    }.execute();
  }


  protected void initvp() {
    list = new arraylist<imageview>();
    if(data != null && data.getresult().getadvs().size() > 0){
      for (int i = 0; i < data.getresult().getadvs().size(); i++) {
        imageview iv = new imageview(this);
        iv.setscaletype(scaletype.fit_xy);
        imageloader.getinstance().displayimage(data.getresult().getadvs().get(i).getpic(), iv);
        list.add(iv);
      }
      //创建适配器
      mypageradatper mypageradatper = new mypageradatper(list);
      vp.setadapter(mypageradatper);
      initdoc();

      vp.addonpagechangelistener(new onpagechangelistener() {

        @override
        public void onpageselected(int arg0) {
          int index = arg0 % list_doc.size();
          for (int i = 0; i < list_doc.size(); i++) {
            list_doc.get(i).setbackgroundresource(r.drawable.doc_uncheck);
          }
          list_doc.get(index).setbackgroundresource(r.drawable.doc_check);
        }

        @override
        public void onpagescrolled(int arg0, float arg1, int arg2) {
          // todo auto-generated method stub

        }

        @override
        public void onpagescrollstatechanged(int arg0) {
          // todo auto-generated method stub

        }
      });
    }
  }

}

myapp.xml：

public class myapp extends application{
  @override
  public void oncreate() {
    // todo auto-generated method stub
    super.oncreate();
    imageloaderconfiguration configuration = imageloaderconfiguration.createdefault(this);
    imageloader.getinstance().init(configuration);
  }
}

com.example.monthextwo.adapter包下的mypageradatper.java：

public class mypageradatper extends pageradapter{

  list<imageview> list;

  public mypageradatper(list<imageview> list) {
    super();
    this.list = list;
  }

  @override
  public int getcount() {
    if(list != null){
      return integer.max_value;
    }
    return 0;
  }

  @override
  public boolean isviewfromobject(view arg0, object arg1) {
    // todo auto-generated method stub
    return arg0 == arg1;
  }

  @override
  public void destroyitem(viewgroup container, int position, object object) {
    // todo auto-generated method stub
    container.removeview((view) object);
  }

  @override
  public object instantiateitem(viewgroup container, int position) {
    int index = position % list.size();
    container.addview(list.get(index));
    return list.get(index);
  }


}

com.example.monthextwo.bean包下的adv.java：

public class adv {
  string pic;

  public string getpic() {
    return pic;
  }

  public void setpic(string pic) {
    this.pic = pic;
  }

  @override
  public string tostring() {
    return "avd [pic=" + pic + "]";
  }
}

brand.java： *这是个空文件*

public class category {     }

category.java： *这是个空文件*

public class category {     }

dataresult.java：

public class dataresult {
  result result;

  public result getresult() {
    return result;
  }

  public void setresult(result result) {
    this.result = result;
  }

  @override
  public string tostring() {
    return "dataresult [result=" + result + "]";
  }


}

nation.java： *这是个空文件*

public class nation {       }

result.java：

public class result {
 list<adv> advs = new arraylist<adv>();
 list<brand> brands = new arraylist<brand>();
 list<category> categorys = new arraylist<category>();
 list<nation> nations = new arraylist<nation>();
 public list<adv> getadvs() {
 return advs;
 }
 public void setadvs(list<adv> advs) {
 this.advs = advs;
 }
 public list<brand> getbrands() {
 return brands;
 }
 public void setbrands(list<brand> brands) {
 this.brands = brands;
 }
 public list<category> getcategorys() {
 return categorys;
 }
 public void setcategorys(list<category> categorys) {
 this.categorys = categorys;
 }
 public list<nation> getnations() {
 return nations;
 }
 public void setnations(list<nation> nations) {
 this.nations = nations;
 }
 @override
 public string tostring() {
 return "result [avds=" + advs + ", brands=" + brands + ", categorys="
  + categorys + ", nations=" + nations + "]";
 }
}

com.example.monthextwo.net包下的netutils.java：

public class netutils {
 public static string getnetdata(string path){
 string json = "";
 try {
  url url = new url(path);
  httpurlconnection conn = (httpurlconnection) url.openconnection();
  conn.setrequestmethod("get");
  int code = conn.getresponsecode();
  if(code == 200){
  inputstream is = conn.getinputstream();
  bytearrayoutputstream bos = new bytearrayoutputstream();
  int len = -1;
  byte[] buff = new byte[1024];
  while((len = is.read(buff)) != -1){
   bos.write(buff, 0, len);
  }
  json = new string(bos.tobytearray());
  }
 } catch (exception e) {
  // todo auto-generated catch block
  e.printstacktrace();
 }
 return json;
 }
}

以上就是全部的代码了，新手练习。

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。