本文实例讲解了android实现图片文字轮播特效的详细代码，分享给大家供大家参考，具体内容如下
图片轮播是类似知乎日报上的一个轮播效果，如下图。
好了直接进入正题，首先是出示一下效果：
mainactivity：
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import java.util.arraylist; import java.util.list; import java.util.concurrent.executors; import java.util.concurrent.scheduledexecutorservice; import java.util.concurrent.timeunit; import android.os.bundle; import android.app.activity; import android.support.v4.view.pageradapter; import android.support.v4.view.viewpager; import android.support.v4.view.viewpager.onpagechangelistener; import android.view.view; import android.view.viewgroup; import android.widget.imageview; import android.widget.imageview.scaletype; import android.widget.linearlayout; import android.widget.textview; public class mainactivity extends activity { //viewpager private viewpager view_pager; private linearlayout ll_dotgroup; private textview newstitle; private int imgresids[] = new int[]{r.drawable.a, r.drawable.b, r.drawable.c, r.drawable.d, r.drawable.b}; //存储5张图片 private string textview[]=new string[]{"12412515125","fawfafawf" ,"13f1f12f211","1251f1f12","1t1f12f121"}; //存储5个目录 private int curindex = 0; //用来记录当前滚动的位置 picsadapter picsadapter; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); setviewpager(); } private void setviewpager() { newstitle=(textview)findviewbyid(r.id.newstitle); view_pager = (viewpager) findviewbyid(r.id.view_pager); ll_dotgroup = (linearlayout) findviewbyid(r.id.dotgroup); picsadapter = new picsadapter(); // 创建适配器 picsadapter.setdata(imgresids); view_pager.setadapter(picsadapter); // 设置适配器 view_pager.setonpagechangelistener(new mypagechangelistener()); //设置页面切换监听器 initpoints(imgresids.length); // 初始化图片小圆点 startautoscroll(); // 开启自动播放 } // 初始化图片轮播的小圆点和目录 private void initpoints(int count) { for (int i = 0; i < count; i++) { imageview iv = new imageview(this); linearlayout.layoutparams params = new linearlayout.layoutparams( 20, 20); params.setmargins(0, 0, 20, 0); iv.setlayoutparams(params); iv.setimageresource(r.drawable.dot1); ll_dotgroup.addview(iv); } ((imageview) ll_dotgroup.getchildat(curindex)) .setimageresource(r.drawable.dot2); newstitle.settext(textview[curindex]); } // 自动播放 private void startautoscroll() { scheduledexecutorservice scheduledexecutorservice = executors .newsinglethreadscheduledexecutor(); // 每隔4秒钟切换一张图片 scheduledexecutorservice.schedulewithfixeddelay(new viewpagertask(), 5, 4, timeunit.seconds); } // 切换图片任务 private class viewpagertask implements runnable { @override public void run() { runonuithread(new runnable() { @override public void run() { int count = picsadapter.getcount(); view_pager.setcurrentitem((curindex + 1) % count); } }); } } // 定义viewpager控件页面切换监听器 class mypagechangelistener implements onpagechangelistener { @override public void onpagescrolled(int position, float positionoffset, int positionoffsetpixels) { } @override public void onpageselected(int position) { imageview imageview1 = (imageview) ll_dotgroup.getchildat(position); imageview imageview2 = (imageview) ll_dotgroup.getchildat(curindex); if (imageview1 != null) { imageview1.setimageresource(r.drawable.dot2); } if (imageview2 != null) { imageview2.setimageresource(r.drawable.dot1); } curindex = position; newstitle.settext(textview[curindex]); } boolean b = false; @override public void onpagescrollstatechanged(int state) { //这段代码可不加，主要功能是实现切换到末尾后返回到第一张 switch (state) { case 1:// 手势滑动 b = false; break; case 2:// 界面切换中 b = true; break; case 0:// 滑动结束，即切换完毕或者加载完毕 // 当前为最后一张，此时从右向左滑，则切换到第一张 if (view_pager.getcurrentitem() == view_pager.getadapter() .getcount() - 1 && !b) { view_pager.setcurrentitem(0); } // 当前为第一张，此时从左向右滑，则切换到最后一张 else if (view_pager.getcurrentitem() == 0 && !b) { view_pager.setcurrentitem(view_pager.getadapter() .getcount() - 1); } break; default: break; } } } // 定义viewpager控件适配器 class picsadapter extends pageradapter { private list<imageview> views = new arraylist<imageview>(); @override public int getcount() { if (views == null) { return 0; } return views.size(); } public void setdata(int[] imgresids) { for (int i = 0; i < imgresids.length; i++) { imageview iv = new imageview(mainactivity.this); viewgroup.layoutparams params = new viewgroup.layoutparams( viewgroup.layoutparams.match_parent, viewgroup.layoutparams.match_parent); iv.setlayoutparams(params); iv.setscaletype(scaletype.fit_xy); //设置imageview的属性 iv.setimageresource(imgresids[i]); views.add(iv); } } public object getitem(int position) { if (position < getcount()) return views.get(position); return null; } @override public boolean isviewfromobject(view arg0, object arg1) { return arg0 == arg1; } @override public void destroyitem(view container, int position, object object) { if (position < views.size()) ((viewpager) container).removeview(views.get(position)); } @override public int getitemposition(object object) { return views.indexof(object); } @override public object instantiateitem(view container, int position) { if (position < views.size()) { final imageview imageview = views.get(position); ((viewpager) container).addview(imageview); return views.get(position); } return null; } } } |
activity_main:
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<relativelayout 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" tools:context=".mainactivity" > <relativelayout android:layout_width="match_parent" android:layout_height="150dp" android:layout_marginbottom="5dp" android:orientation="vertical" > <android.support.v4.view.viewpager android:id="@+id/view_pager" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_gravity="center" > </android.support.v4.view.viewpager> <relativelayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignparentbottom="true" android:background="@drawable/focus_bg" > <textview android:id="@+id/newstitle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="我校交换生演讲比赛夺冠 美国华盛本大学万里发来贺电" android:paddingtop="10dp" android:paddingbottom="8dp" android:paddingleft="10dp" android:paddingright="100dp" android:textsize="15sp" android:textcolor="#fff"/> <linearlayout android:id="@+id/dotgroup" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignparentright="true" android:paddingtop="23dp" android:paddingright="10dp" android:gravity="center" android:layout_marginbottom="15dp" android:orientation="horizontal" > </linearlayout> </relativelayout> </relativelayout> </relativelayout> |
以上就是关于android实现图片文字轮播特效讲解，希望对大家的学习有所帮助。
