Android实现轮播效果的两种方法
实现轮播效果有2种方法:
(1)使用ViewPager+ImageView,通过Handler进行间隔发送消息,实现自动轮播效果
xml代码:
<android.support.v4.view.ViewPager android:id="@+id/fragment_viewPager" android:layout_width="match_parent" android:layout_height="200dp"/>
privateHandlerhandler=newHandler(){
@Override
publicvoidhandleMessage(Messagemsg){
super.handleMessage(msg);
list=(List<BannerBean>)msg.obj;
//进行下载图片
for(inti=0;i<3;i++){
Picasso.with(getActivity()).load(list.get(i).getImgs()).resize(640,400).into(imgs.get(i));
}
//展示图片
MyAdapteradapter=newMyAdapter();
viewPager.setAdapter(adapter);
}
};
privateHandlerhandler2=newHandler(){
@Override
publicvoidhandleMessage(Messagemsg){
super.handleMessage(msg);
//获取当前viewPager的位置
intpos=viewPager.getCurrentItem();
//如果是最后一张图片就进行设置为第一张,实现循环
if(pos==imgs.size()-1){
pos=0;
//否则进行下一张图片展示
}else{
pos++;
}
//设置viewPager的位置
viewPager.setCurrentItem(pos);
//定时发送消息
handler2.sendEmptyMessageDelayed(1,2000);
}
};
@Override
publicViewonCreateView(LayoutInflaterinflater,ViewGroupcontainer,
BundlesavedInstanceState){
Viewview=inflater.inflate(R.layout.fragment_recreation,container,false);
initview(view);
load();
//发送消息给handler2,实现自动轮播
handler2.sendEmptyMessageDelayed(1,2000);
initListener();
returnview;
}
privatevoidload(){
//下载图片地址
newThread(){
@Override
publicvoidrun(){
super.run();
Stringjson=Utils.getJsonFromNet(ContentUrls.headLine_head+0);
if(!TextUtils.isEmpty(json)){
List<BannerBean>data=ParserBanner.getData(json);
Messagemsg=newMessage();
msg.obj=data;
handler.sendMessage(msg);
}
}
}.start();
data=newArrayList<>();
headlineAdapter=newHeadlineAdapter(data,getActivity());
lv.setAdapter(headlineAdapter);
newMyAsyncTask(data,headlineAdapter).execute(ContentUrls.headLine_head+num);
}
privatevoidinitview(Viewview){
lv=((ListView)view.findViewById(R.id.lv));
headerView=LayoutInflater.from(getActivity()).inflate(R.layout.header_layout,null,false);
viewPager=((ViewPager)headerView.findViewById(R.id.fragment_viewPager));
lv.addHeaderView(headerView);
list=newArrayList<>();
imgs=newArrayList<>();
for(inti=0;i<3;i++){
ImageViewiv=newImageView(getActivity());
imgs.add(iv);
}
}
adapter:
classMyAdapterextendsPagerAdapter{
@Override
publicintgetCount(){
returnimgs.size();
}
@Override
publicbooleanisViewFromObject(Viewview,Objectobject){
returnview==object;
}
@Override
publicObjectinstantiateItem(ViewGroupcontainer,intposition){
container.addView(imgs.get(position));
returnimgs.get(position);
}
@Override
publicvoiddestroyItem(ViewGroupcontainer,intposition,Objectobject){
//super.destroyItem(container,position,object);
container.removeView(imgs.get(position));
}
}
(2)使用SliderLayout第三方进行实现轮播
添加依赖:
compile'com.squareup.picasso:picasso:2.5.2' compile'com.daimajia.slider:library:1.1.5@aar' compile'com.nineoldandroids:library:2.4.0'
xml代码:
<?xmlversion="1.0"encoding="utf-8"?> <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <com.daimajia.slider.library.SliderLayout android:id="@+id/header_slider" android:layout_width="match_parent" android:layout_height="160dp"></com.daimajia.slider.library.SliderLayout> </LinearLayout>
Java代码:
privateListViewlv;
privateString[]title={"烟","超标","标准","审车合格"};
privateint[]imgs={R.mipmap.a,R.mipmap.b,R.mipmap.c,R.mipmap.d};
privateSliderLayoutslider;
@Override
publicViewonCreateView(LayoutInflaterinflater,ViewGroupcontainer,
BundlesavedInstanceState){
Viewview=inflater.inflate(R.layout.fragment_home_page,container,false);
lv=((ListView)view.findViewById(R.id.homePage_lv));
ViewheaderView=LayoutInflater.from(getActivity()).inflate(R.layout.header_layout,null,false);
slider=((SliderLayout)headerView.findViewById(R.id.header_slider));
lv.addHeaderView(headerView);
initSlider();
initData();
returnview;
}
privatevoidinitSlider(){
for(inti=0;i<4;i++){
TextSliderViewtextSlider=newTextSliderView(getActivity());
textSlider.image(imgs[i]).description(title[i]);
slider.addSlider(textSlider);
textSlider.setOnSliderClickListener(newBaseSliderView.OnSliderClickListener(){
@Override
publicvoidonSliderClick(BaseSliderViewslider){
Toast.makeText(getActivity(),slider.getDescription(),Toast.LENGTH_SHORT).show();
}
});
}
}
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