1.Magicindicator介绍
Magicindicator是一个强大、可定制、易扩展的 ViewPager 指示器框架。是ViewPagerIndicator、TabLayout、PagerSlidingTabStrip的最佳替代品。支持角标,更支持在非ViewPager场景下使用(使用hide()、show()切换Fragment或使用setVisibility切换FrameLayout里的View等)。
2.Magicindicator使用环境配置
repositories {
...
maven {
url "https://jitpack.io"
}
}
dependencies {
...
compile ‘com.github.hackware1993:MagicIndicator:1.5.0‘
}
3.利用Magicindicator实现viewpager底部的圆形指示器
(1)xml布局
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <!--利用帧布局实现在viewpager上添加标题--> <FrameLayout android:layout_width="match_parent" android:layout_height="180dp"> <!--利用ViewPager实现轮播图效果--> <android.support.v4.view.ViewPager android:id="@+id/vp_news_center" android:layout_width="match_parent" android:layout_height="match_parent"> </android.support.v4.view.ViewPager> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="bottom" android:background="#a000" android:padding="10dp"> <TextView android:id="@+id/tv_news_vp_title" android:text="标题" android:textColor="#fff" android:textSize="16dp" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <!--MagicIndicator的使用--> <net.lucode.hackware.magicindicator.MagicIndicator android:id="@+id/magic_indicator1" android:layout_width="wrap_content" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:layout_height="wrap_content" /> </RelativeLayout> </FrameLayout> </LinearLayout>
(2)java后台
package com.example.administrator.test66smartbeijing.fragment; import android.annotation.SuppressLint; import android.graphics.Color; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import com.alibaba.fastjson.JSONObject; import com.bumptech.glide.Glide; import com.example.administrator.test66smartbeijing.R; import com.example.administrator.test66smartbeijing.javabean.NewsMenu; import com.example.administrator.test66smartbeijing.javabean.NewsTabBean; import com.example.administrator.test66smartbeijing.utils.CacheUtils; import com.example.administrator.test66smartbeijing.utils.ConstantValue; import com.example.administrator.test66smartbeijing.utils.RecyclerAdapter; import net.lucode.hackware.magicindicator.MagicIndicator; import net.lucode.hackware.magicindicator.ViewPagerHelper; import net.lucode.hackware.magicindicator.buildins.circlenavigator.CircleNavigator; import org.xutils.common.Callback; import org.xutils.http.RequestParams; import org.xutils.image.ImageOptions; import org.xutils.x; import java.util.ArrayList; import static android.media.AudioRecord.MetricsConstants.CHANNELS; /** * */ public class TabDataFragment extends Fragment { String queryResultStr=""; NewsMenu newsMenu; ArrayList<NewsTabBean.TopNews> topnews; private ViewPager viewPager; TextView tv_news_vp_title; public TabDataFragment() { } @SuppressLint("ValidFragment") public TabDataFragment(NewsMenu newsMenu) { this.newsMenu=newsMenu; } //新建一个Fragment实例 public static Fragment newInstance() { TabDataFragment fragment = new TabDataFragment(); return fragment; } @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // LayoutInflater.inflate()的功能是将一段 XML 资源文件加载成为 View。所以通常用于将 XML 文件实例化为 View。然后获取 View 上的组件最后操作之。 View rootView = inflater.inflate(R.layout.fragment_tab_data, container, false); viewPager = rootView.findViewById(R.id.vp_news_center); tv_news_vp_title=rootView.findViewById(R.id.tv_news_vp_title); getDataFromServer(); return rootView; } /** * viewPager的数据适配器 */ class NewsCenterAdapter extends PagerAdapter{ @Override public int getCount() { return topnews.size(); } @Override public boolean isViewFromObject(@NonNull View view, @NonNull Object object) { return view==object; } @NonNull @Override public Object instantiateItem(@NonNull ViewGroup container, int position) { ImageView imageView=new ImageView(getActivity()); //imageView.setImageResource(R.mipmap.news_pic_default); String imageUrlTemp=topnews.get(position).topimage; //String imageUrl="http://118.25.152.62:8080/zhbj/10007/1452327318UU91.jpg"; String imageUrl=ConstantValue.SERVER_URL+imageUrlTemp.substring(25); System.out.println(imageUrl); //利用Glide开源框架,加载网络图片 Glide.with(getActivity()).load(imageUrl).into(imageView); container.addView(imageView); return imageView; } //销毁item @Override public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) { container.removeView((View) object); } } /** * 从服务器获取数据 */ private void getDataFromServer() { //请求地址 String url=ConstantValue.SERVER_URL+newsMenu.data.get(0).children.get(0).url; RequestParams params = new RequestParams(url); x.http().get(params, new Callback.CommonCallback<String>() { @Override public void onSuccess(String result) { //解析result queryResultStr=result; System.out.println(result); processData(queryResultStr); //写缓存 CacheUtils.setCache(ConstantValue.NEWSCENTER_URL,queryResultStr,getActivity()); } //请求异常后的回调方法 @Override public void onError(Throwable ex, boolean isOnCallback) { } //主动调用取消请求的回调方法 @Override public void onCancelled(CancelledException cex) { } @Override public void onFinished() { } }); } /** * @param queryResultStr 服务器返回结果 */ private void processData(String queryResultStr) { NewsTabBean newsTabBean = JSONObject.parseObject(queryResultStr,NewsTabBean.class); //利用viewPager实现图片轮播效果 topnews = newsTabBean.data.topnews; if(topnews!=null){ viewPager.setAdapter(new NewsCenterAdapter()); viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(int position) { //设置viewpager上图片的标题 tv_news_vp_title.setText(topnews.get(position).title); } @Override public void onPageScrollStateChanged(int state) { } }); //更新第一个头条新闻标题 tv_news_vp_title.setText(topnews.get(0).title); initMagicIndicator1(); } } /** * 初始化MagicIndicator */ private void initMagicIndicator1() { MagicIndicator magicIndicator = getActivity().findViewById(R.id.magic_indicator1); CircleNavigator circleNavigator = new CircleNavigator(getActivity()); circleNavigator.setCircleCount(topnews.size()); circleNavigator.setCircleColor(Color.RED); circleNavigator.setCircleClickListener(new CircleNavigator.OnCircleClickListener() { @Override public void onClick(int index) { viewPager.setCurrentItem(index); } }); magicIndicator.setNavigator(circleNavigator); ViewPagerHelper.bind(magicIndicator, viewPager); } }
4.效果图