前言
本文主要给大家介绍了关于android模仿美团顶部滑动菜单的相关内容，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧。
先来看下效果图：
实现方法
这是通过 viewpager 和 gridview 相结合做出来的效果，每一个 viewpager 页面都是一个 gridview，底部的每个滑动指示圆点都是从布局文件中 inflate 出来的
首先需要一个代表每个活动主题的 javabean
/**
* created by czy on /6/23.
*/
public class subject {
//主题名
private string name;
//主题图标资源id
private int icon;
public subject(string name, int icon) {
this.name = name;
this.icon = icon;
}
public string getname() {
return name;
}
public void setname(string name) {
this.name = name;
}
public int geticon() {
return icon;
}
public void seticon(int icon) {
this.icon = icon;
}
}
然后用一个 list< subject >来承载需要显示的所有主题内容，将这些数据传给 gridviewadapter 。因为 viewpager 有几个页面就有几个gridview ，每个gridview对应的是哪些数据都需要在其内部根据页面索引进行计算
/**
* created by czy on /6/23.
*/
public class gridviewadapter extends baseadapter {
private list subjectlist;
private layoutinflater layoutinflater;
//当前页索引
private int currentindex;
//占满屏幕时每页展示的主题个数
private int pagesize;
public gridviewadapter(context context, list subjectlist, int currentindex, int pagesize) {
this.layoutinflater = layoutinflater.from(context);
this.subjectlist = subjectlist;
this.currentindex = currentindex;
this.pagesize = pagesize;
}
/**
* 如果剩余数据能够完全占满当前页，则返回 pagesize
* 如果不能，则返回剩余的数据个数
*/
@override
public int getcount() {
return subjectlist.size() > (currentindex + 1) * pagesize ? pagesize : (subjectlist.size() - currentindex * pagesize);
}
/**
* 计算出正确的索引
*/
@override
public object getitem(int position) {
return subjectlist.get(position + currentindex * pagesize);
}
@override
public long getitemid(int position) {
return position + currentindex * pagesize;
}
@override
public view getview(int position, view convertview, viewgroup parent) {
viewholder viewholder;
if (convertview == null) {
convertview = layoutinflater.inflate(r.layout.item_grid_view, parent, false);
viewholder = new viewholder();
viewholder.tv_subject = (textview) convertview.findviewbyid(r.id.tv_subject);
viewholder.iv_subject = (imageview) convertview.findviewbyid(r.id.iv_subject);
convertview.settag(viewholder);
} else {
viewholder = (viewholder) convertview.gettag();
}
int pos = position + currentindex * pagesize;
viewholder.tv_subject.settext(subjectlist.get(pos).getname());
viewholder.iv_subject.setimageresource(subjectlist.get(pos).geticon());
return convertview;
}
private class viewholder {
private textview tv_subject;
private imageview iv_subject;
}
}
需要使用到的布局文件 item_grid_view 如下所示
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingbottom="10dp"
android:paddingtop="10dp">
android:id="@+id/iv_subject"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_centerhorizontal="true" />
android:id="@+id/tv_subject"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/iv_subject"
android:layout_centerhorizontal="true"
android:layout_margintop="3dp"
android:textsize="12sp" />
使用到了 viewpager，自然也需要一个 viewpageradapter
/**
* created by czy on /6/23.
*/
public class viewpageradapter extends pageradapter {
private list viewlist;
public viewpageradapter(list viewlist) {
this.viewlist = viewlist;
}
@override
public void destroyitem(viewgroup container, int position, object object) {
container.removeview(viewlist.get(position));
}
@override
public object instantiateitem(viewgroup container, int position) {
container.addview(viewlist.get(position));
return (viewlist.get(position));
}
@override
public int getcount() {
return viewlist == null ? 0 : viewlist.size();
}
@override
public boolean isviewfromobject(view view, object object) {
return view == object;
}
}
在 mainactivity 中进行数据填充
public class mainactivity extends appcompatactivity {
private string[] titles = {"美食", "电影", "酒店住宿", "休闲娱乐", "甜品饮品",
"水上乐园", "汽车服务", "美发", "丽人", "景点",
"足疗按摩", "运动健身", "健身", "超市", "买菜",
"今日新单", "外卖", "自助餐", "ktv", "机票/火车票",
"周边游", "小吃快餐", "面膜", "美甲美睫", "火锅",
"生日蛋糕", "母婴亲子", "生活服务", "婚纱摄影", "学习培训",
"家装", "结婚"};
private list subjectlist;
private linearlayout ll_dot;
//每页展示的主题个数
private final int pagesize = 10;
//当前页索引
private int currentindex;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
viewpager viewpager = (viewpager) findviewbyid(r.id.viewpager);
ll_dot = (linearlayout) findviewbyid(r.id.ll_dot);
subjectlist = new arraylist<>();
for (string title : titles) {
subjectlist.add(new subject(title, r.drawable.icon));
}
//需要的页面数
int pagecount = (int) math.ceil(subjectlist.size() * 1.0 / pagesize);
list viewlist = new arraylist<>();
for (int i = 0; i < pagecount; i++) {
gridview gridview = (gridview) getlayoutinflater().inflate(r.layout.layout_grid_view, viewpager, false);
gridview.setadapter(new gridviewadapter(this, subjectlist, i, pagesize));
viewlist.add(gridview);
gridview.setonitemclicklistener(new adapterview.onitemclicklistener() {
@override
public void onitemclick(adapterview> parent, view view, int position, long id) {
int pos = position + currentindex * pagesize;
toast.maketext(mainactivity.this, subjectlist.get(pos).getname(), toast.length_short).show();
}
});
}
viewpager.setadapter(new viewpageradapter(viewlist));
for (int i = 0; i < pagecount; i++) {
ll_dot.addview(getlayoutinflater().inflate(r.layout.view_dot, null));
}
//使第一个小圆点呈选中状态
ll_dot.getchildat(0).findviewbyid(r.id.v_dot).setbackgroundresource(r.drawable.dot_selected);
viewpager.addonpagechangelistener(new viewpager.onpagechangelistener() {
public void onpageselected(int position) {
ll_dot.getchildat(currentindex).findviewbyid(r.id.v_dot).setbackgroundresource(r.drawable.dot_normal);
ll_dot.getchildat(position).findviewbyid(r.id.v_dot).setbackgroundresource(r.drawable.dot_selected);
currentindex = position;
}
public void onpagescrolled(int arg0, float arg1, int arg2) {
}
public void onpagescrollstatechanged(int arg0) {
}
});
}
}
每一个小圆点都对应一个布局文件，其中只包含一个view，重点是设置是设备其 background 属性，使其呈现圆形
android:layout_width="wrap_content"
android:layout_height="wrap_content">
android:id="@+id/v_dot"
android:layout_width="8dp"
android:layout_height="8dp"
android:layout_marginleft="2dp"
android:layout_marginright="2dp"
android:background="@drawable/dot_normal" />
代码整体来说都挺简单的，这里也提供源代码下载：仿美团顶部滑动菜单
总结
以上就是这篇文章的全部内容了，希望本文的内容对各位android开发者们的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对萬仟网的支持。
