Android实现轮播效果的两种方法
实现轮播效果有2种方法:
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(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:
private Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
list= (List) msg.obj;
//进行下载图片
for (int i = 0; i < 3; i++) {
Picasso.with(getActivity()).load(list.get(i).getImgs()).resize(640,400).into(imgs.get(i));
}
//展示图片
MyAdapter adapter=new MyAdapter();
viewPager.setAdapter(adapter);
}
};
private Handler handler2=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
//获取当前viewPager的位置
int pos=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
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view=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();
return view;
}
private void load() {
//下载图片地址
new Thread(){
@Override
public void run() {
super.run();
String json= Utils.getJsonFromNet(ContentUrls.headLine_head+0);
if(!TextUtils.isEmpty(json)){
Listdata= ParserBanner.getData(json);
Message msg=new Message();
msg.obj=data;
handler.sendMessage(msg);
}
}
}.start();
data=new ArrayList<>();
headlineAdapter=new HeadlineAdapter(data,getActivity());
lv.setAdapter(headlineAdapter);
new MyAsyncTask(data,headlineAdapter).execute(ContentUrls.headLine_head+num);
}
private void initview(View view) {
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=new ArrayList<>();
imgs=new ArrayList<>();
for (int i = 0; i < 3; i++) {
ImageView iv=new ImageView(getActivity());
imgs.add(iv);
}
}
adapter:
class MyAdapter extends PagerAdapter{
@Override
public int getCount() {
return imgs.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view==object;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
container.addView(imgs.get(position));
return imgs.get(position);
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// 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:
<?xml version="1.0" encoding="utf-8"?>
Java代码:
private ListView lv;
private String[] title={"烟","超标","标准","审车合格"};
private int[] imgs={R.mipmap.a,R.mipmap.b,R.mipmap.c,R.mipmap.d};
private SliderLayout slider;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.fragment_home_page, container, false);
lv = ((ListView) view.findViewById(R.id.homePage_lv));
View headerView=LayoutInflater.from(getActivity()).inflate(R.layout.header_layout,null,false);
slider = ((SliderLayout) headerView.findViewById(R.id.header_slider));
lv.addHeaderView(headerView);
initSlider();
initData();
return view;
}
private void initSlider() {
for (int i = 0; i < 4; i++) {
TextSliderView textSlider=new TextSliderView(getActivity());
textSlider.image(imgs[i]).description(title[i]);
slider.addSlider(textSlider);
textSlider.setOnSliderClickListener(new BaseSliderView.OnSliderClickListener() {
@Override
public void onSliderClick(BaseSliderView slider) {
Toast.makeText(getActivity(),slider.getDescription(),Toast.LENGTH_SHORT).show();
}
});
}
}
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