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Android开发中滑动分页功能实例详解

2019年07月24日 | 移动技术网移动技术 | 我要评论

本文实例讲述了android开发中滑动分页功能。分享给大家供大家参考，具体如下：

android ui 往右滑动，滑动到最后一页就自动加载数据并显示

如图：

java代码：

package cn.anycall.ju;
import java.util.arraylist;
import java.util.hashmap;
import java.util.list;
import java.util.map;
import android.app.activity;
import android.content.activitynotfoundexception;
import android.content.context;
import android.content.intent;
import android.content.pm.resolveinfo;
import android.os.bundle;
import android.os.handler;
import android.os.looper;
import android.os.message;
import android.view.keyevent;
import android.view.view;
import android.view.window;
import android.widget.adapterview;
import android.widget.adapterview.onitemclicklistener;
import android.widget.gridview;
import android.widget.toast;
import cn.anycall.ju.scrolllayout.onscreenchangelistenerdataload;
/**
 * gridview分页显示安装的应用程序
 */
public class allapplist extends activity {
  private scrolllayout mscrolllayout;
  private static final float app_page_size = 4.0f;
  private context mcontext;
  private pagecontrolview pagecontrol;
  public myhandler myhandler;
  public int n=0;
  private dataloading dataload;
  @override
  protected void oncreate(bundle savedinstancestate) {
    // todo auto-generated method stub
    super.oncreate(savedinstancestate);
    this.requestwindowfeature(window.feature_no_title);
    mcontext = this;
    setcontentview(r.layout.main);
    dataload = new dataloading();
    mscrolllayout = (scrolllayout)findviewbyid(r.id.scrolllayouttest);
    myhandler = new myhandler(this,1);
    //起一个线程更新数据
    mythread m = new mythread();
    new thread(m).start();
  }
  /**
   * gridview 的onitemlick响应事件
   */
  public onitemclicklistener listener = new onitemclicklistener() {
    public void onitemclick(adapterview<?> parent, view view, int position,
        long id) {
      // todo auto-generated method stub
      system.out.println("position="+position);
    }
  };
  @override
  protected void ondestroy() {
    // todo auto-generated method stub
    android.os.process.killprocess(android.os.process.mypid());
    super.ondestroy();
  }
  @override
  public boolean onkeydown(int keycode, keyevent event) {
    // todo auto-generated method stub
    if (keycode == keyevent.keycode_back) {
      finish();
      return true;
    }
    return super.onkeydown(keycode, event);
  }
  // 更新后台数据
  class mythread implements runnable {
    public void run() {
      try {
        thread.sleep(1000*3);
      } catch (interruptedexception e) {
        // todo auto-generated catch block
        e.printstacktrace();
      }
      string msglist = "1";
      message msg = new message();
      bundle b = new bundle();// 存放数据
      b.putstring("rmsg", msglist);
      msg.setdata(b);
      allapplist.this.myhandler.sendmessage(msg); // 向handler发送消息,更新ui
    }
  }
  class myhandler extends handler {
    private allapplist mcontext;
    public myhandler(context conn,int a) {
      mcontext = (allapplist)conn;
    }
    public myhandler(looper l) {
      super(l);
    }
    // 子类必须重写此方法,接受数据
    @override
    public void handlemessage(message msg) {
      // todo auto-generated method stub
      super.handlemessage(msg);
      bundle b = msg.getdata();
      string rmsg = b.getstring("rmsg");
      if ("1".equals(rmsg)) {
        // do nothing
         list<map> list = new arraylist<map>();
         for(int i =0;i<16;i++){
           n++;
           map map = new hashmap();
            map.put("name", n);
            list.add(map);
         }
        int pageno = (int)math.ceil( list.size()/app_page_size);
        for (int i = 0; i < pageno; i++) {
          gridview apppage = new gridview(mcontext);
          // get the "i" page data
          apppage.setadapter(new appadapter(mcontext, list, i));
          apppage.setnumcolumns(2);
          apppage.setonitemclicklistener(listener);
          mscrolllayout.addview(apppage);
        }
        //加载分页
        pagecontrol = (pagecontrolview) findviewbyid(r.id.pagecontrol);
        pagecontrol.bindscrollviewgroup(mscrolllayout);
        //加载分页数据
        dataload.bindscrollviewgroup(mscrolllayout);
        }
      }
    }
  //分页数据
  class dataloading {
    private int count;
    public void bindscrollviewgroup(scrolllayout scrollviewgroup) {
      this.count=scrollviewgroup.getchildcount();
      scrollviewgroup.setonscreenchangelistenerdataload(new onscreenchangelistenerdataload() {
        public void onscreenchange(int currentindex) {
          // todo auto-generated method stub
          generatepagecontrol(currentindex);
        }
      });
    }
    private void generatepagecontrol(int currentindex){
      //如果到最后一页，就加载16条记录
      if(count==currentindex+1){
        mythread m = new mythread();
        new thread(m).start();
      }
    }
  }
}

java代码：

package cn.anycall.ju;
import java.util.arraylist;
import java.util.hashmap;
import java.util.list;
import java.util.map;
import android.app.activity;
import android.content.activitynotfoundexception;
import android.content.context;
import android.content.intent;
import android.content.pm.resolveinfo;
import android.os.bundle;
import android.os.handler;
import android.os.looper;
import android.os.message;
import android.view.keyevent;
import android.view.view;
import android.view.window;
import android.widget.adapterview;
import android.widget.adapterview.onitemclicklistener;
import android.widget.gridview;
import android.widget.toast;
import cn.anycall.ju.scrolllayout.onscreenchangelistenerdataload;
/**
 * gridview分页显示安装的应用程序
 */
public class allapplist extends activity {
  private scrolllayout mscrolllayout;
  private static final float app_page_size = 4.0f;
  private context mcontext;
  private pagecontrolview pagecontrol;
  public myhandler myhandler;
  public int n=0;
  private dataloading dataload;
  @override
  protected void oncreate(bundle savedinstancestate) {
    // todo auto-generated method stub
    super.oncreate(savedinstancestate);
    this.requestwindowfeature(window.feature_no_title);
    mcontext = this;
    setcontentview(r.layout.main);
    dataload = new dataloading();
    mscrolllayout = (scrolllayout)findviewbyid(r.id.scrolllayouttest);
    myhandler = new myhandler(this,1);
    //起一个线程更新数据
    mythread m = new mythread();
    new thread(m).start();
  }
  /**
   * gridview 的onitemlick响应事件
   */
  public onitemclicklistener listener = new onitemclicklistener() {
    public void onitemclick(adapterview<?> parent, view view, int position,
        long id) {
      // todo auto-generated method stub
      system.out.println("position="+position);
    }
  };
  @override
  protected void ondestroy() {
    // todo auto-generated method stub
    android.os.process.killprocess(android.os.process.mypid());
    super.ondestroy();
  }
  @override
  public boolean onkeydown(int keycode, keyevent event) {
    // todo auto-generated method stub
    if (keycode == keyevent.keycode_back) {
      finish();
      return true;
    }
    return super.onkeydown(keycode, event);
  }
  // 更新后台数据
  class mythread implements runnable {
    public void run() {
      try {
        thread.sleep(1000*3);
      } catch (interruptedexception e) {
        // todo auto-generated catch block
        e.printstacktrace();
      }
      string msglist = "1";
      message msg = new message();
      bundle b = new bundle();// 存放数据
      b.putstring("rmsg", msglist);
      msg.setdata(b);
      allapplist.this.myhandler.sendmessage(msg); // 向handler发送消息,更新ui
    }
  }
  class myhandler extends handler {
    private allapplist mcontext;
    public myhandler(context conn,int a) {
      mcontext = (allapplist)conn;
    }
    public myhandler(looper l) {
      super(l);
    }
    // 子类必须重写此方法,接受数据
    @override
    public void handlemessage(message msg) {
      // todo auto-generated method stub
      super.handlemessage(msg);
      bundle b = msg.getdata();
      string rmsg = b.getstring("rmsg");
      if ("1".equals(rmsg)) {
        // do nothing
         list<map> list = new arraylist<map>();
         for(int i =0;i<16;i++){
           n++;
           map map = new hashmap();
            map.put("name", n);
            list.add(map);
         }
        int pageno = (int)math.ceil( list.size()/app_page_size);
        for (int i = 0; i < pageno; i++) {
          gridview apppage = new gridview(mcontext);
          // get the "i" page data
          apppage.setadapter(new appadapter(mcontext, list, i));
          apppage.setnumcolumns(2);
          apppage.setonitemclicklistener(listener);
          mscrolllayout.addview(apppage);
        }
        //加载分页
        pagecontrol = (pagecontrolview) findviewbyid(r.id.pagecontrol);
        pagecontrol.bindscrollviewgroup(mscrolllayout);
        //加载分页数据
        dataload.bindscrollviewgroup(mscrolllayout);
        }
      }
    }
  //分页数据
  class dataloading {
    private int count;
    public void bindscrollviewgroup(scrolllayout scrollviewgroup) {
      this.count=scrollviewgroup.getchildcount();
      scrollviewgroup.setonscreenchangelistenerdataload(new onscreenchangelistenerdataload() {
        public void onscreenchange(int currentindex) {
          // todo auto-generated method stub
          generatepagecontrol(currentindex);
        }
      });
    }
    private void generatepagecontrol(int currentindex){
      //如果到最后一页，就加载16条记录
      if(count==currentindex+1){
        mythread m = new mythread();
        new thread(m).start();
      }
    }
  }
}

java代码：

package cn.anycall.ju;
import java.util.arraylist;
import java.util.list;
import java.util.map;
import android.content.context;
import android.content.pm.packagemanager;
import android.content.pm.resolveinfo;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.baseadapter;
import android.widget.imageview;
import android.widget.textview;
import cn.anycall.ju.r;
public class appadapter extends baseadapter {
  private list<map> mlist;
  private context mcontext;
  public static final int app_page_size = 4;
  private packagemanager pm;
  public appadapter(context context, list<map> list, int page) {
    mcontext = context;
    pm = context.getpackagemanager();
    mlist = new arraylist<map>();
    int i = page * app_page_size;
    int iend = i+app_page_size;
    while ((i<list.size()) && (i<iend)) {
      mlist.add(list.get(i));
      i++;
    }
  }
  public int getcount() {
    // todo auto-generated method stub
    return mlist.size();
  }
  public object getitem(int position) {
    // todo auto-generated method stub
    return mlist.get(position);
  }
  public long getitemid(int position) {
    // todo auto-generated method stub
    return position;
  }
  public view getview(int position, view convertview, viewgroup parent) {
    // todo auto-generated method stub
    map appinfo = mlist.get(position);
    appitem appitem;
    if (convertview == null) {
      view v = layoutinflater.from(mcontext).inflate(r.layout.app_item, null);
      appitem = new appitem();
      appitem.mappicon = (imageview)v.findviewbyid(r.id.imgdetail);
      appitem.mappname = (textview)v.findviewbyid(r.id.tuaninfo);
      v.settag(appitem);
      convertview = v;
    } else {
      appitem = (appitem)convertview.gettag();
    }
    // set the icon
    appitem.mappicon.setimageresource(r.drawable.icon);
    // set the app name
    appitem.mappname.settext(appinfo.get("name").tostring());
    return convertview;
  }
  /**
   * 每个应用显示的内容，包括图标和名称
   * @author yao.guet
   *
   */
  class appitem {
    imageview mappicon;
    textview mappname;
  }
}

java代码：

package cn.anycall.ju;
import java.util.arraylist;
import java.util.list;
import java.util.map;
import android.content.context;
import android.content.pm.packagemanager;
import android.content.pm.resolveinfo;
import android.view.layoutinflater;
import android.view.view;
import android.view.viewgroup;
import android.widget.baseadapter;
import android.widget.imageview;
import android.widget.textview;
import cn.anycall.ju.r;
public class appadapter extends baseadapter {
  private list<map> mlist;
  private context mcontext;
  public static final int app_page_size = 4;
  private packagemanager pm;
  public appadapter(context context, list<map> list, int page) {
    mcontext = context;
    pm = context.getpackagemanager();
    mlist = new arraylist<map>();
    int i = page * app_page_size;
    int iend = i+app_page_size;
    while ((i<list.size()) && (i<iend)) {
      mlist.add(list.get(i));
      i++;
    }
  }
  public int getcount() {
    // todo auto-generated method stub
    return mlist.size();
  }
  public object getitem(int position) {
    // todo auto-generated method stub
    return mlist.get(position);
  }
  public long getitemid(int position) {
    // todo auto-generated method stub
    return position;
  }
  public view getview(int position, view convertview, viewgroup parent) {
    // todo auto-generated method stub
    map appinfo = mlist.get(position);
    appitem appitem;
    if (convertview == null) {
      view v = layoutinflater.from(mcontext).inflate(r.layout.app_item, null);
      appitem = new appitem();
      appitem.mappicon = (imageview)v.findviewbyid(r.id.imgdetail);
      appitem.mappname = (textview)v.findviewbyid(r.id.tuaninfo);
      v.settag(appitem);
      convertview = v;
    } else {
      appitem = (appitem)convertview.gettag();
    }
    // set the icon
    appitem.mappicon.setimageresource(r.drawable.icon);
    // set the app name
    appitem.mappname.settext(appinfo.get("name").tostring());
    return convertview;
  }
  /**
   * 每个应用显示的内容，包括图标和名称
   * @author yao.guet
   *
   */
  class appitem {
    imageview mappicon;
    textview mappname;
  }
}

java代码：

package cn.anycall.ju;
import android.content.context;
import android.util.attributeset;
import android.widget.imageview;
import android.widget.linearlayout;
import cn.anycall.ju.r;
import cn.anycall.ju.scrolllayout.onscreenchangelistener;
public class pagecontrolview extends linearlayout {
  private context context;
  private int count;
  public void bindscrollviewgroup(scrolllayout scrollviewgroup) {
    this.count=scrollviewgroup.getchildcount();
    system.out.println("count="+count);
    generatepagecontrol(scrollviewgroup.getcurrentscreenindex());
    scrollviewgroup.setonscreenchangelistener(new onscreenchangelistener() {
      public void onscreenchange(int currentindex) {
        // todo auto-generated method stub
        generatepagecontrol(currentindex);
      }
    });
  }
  public pagecontrolview(context context) {
    super(context);
    this.init(context);
  }
  public pagecontrolview(context context, attributeset attrs) {
    super(context, attrs);
    this.init(context);
  }
  private void init(context context) {
    this.context=context;
  }
  private void generatepagecontrol(int currentindex) {
    this.removeallviews();
    int pagenum = 6; // 显示多少个
    int pageno = currentindex+1; //第几页
    int pagesum = this.count; //总共多少页
    if(pagesum>1){
      int currentnum = (pageno % pagenum == 0 ? (pageno / pagenum) - 1
           : (int) (pageno / pagenum))
           * pagenum;
       if (currentnum < 0)
         currentnum = 0;
       if (pageno > pagenum){
         imageview imageview = new imageview(context);
         imageview.setimageresource(r.drawable.zuo);
         this.addview(imageview);
       }
       for (int i = 0; i < pagenum; i++) {
         if ((currentnum + i + 1) > pagesum || pagesum < 2)
           break;
         imageview imageview = new imageview(context);
         if(currentnum + i + 1 == pageno){
           imageview.setimageresource(r.drawable.page_indicator_focused);
         }else{
           imageview.setimageresource(r.drawable.page_indicator);
         }
         this.addview(imageview);
       }
       if (pagesum > (currentnum + pagenum)) {
         imageview imageview = new imageview(context);
         imageview.setimageresource(r.drawable.you);
         this.addview(imageview);
       }
    }
  }
}

java代码：

package cn.anycall.ju;
import android.content.context;
import android.util.attributeset;
import android.widget.imageview;
import android.widget.linearlayout;
import cn.anycall.ju.r;
import cn.anycall.ju.scrolllayout.onscreenchangelistener;
public class pagecontrolview extends linearlayout {
  private context context;
  private int count;
  public void bindscrollviewgroup(scrolllayout scrollviewgroup) {
    this.count=scrollviewgroup.getchildcount();
    system.out.println("count="+count);
    generatepagecontrol(scrollviewgroup.getcurrentscreenindex());
    scrollviewgroup.setonscreenchangelistener(new onscreenchangelistener() {
      public void onscreenchange(int currentindex) {
        // todo auto-generated method stub
        generatepagecontrol(currentindex);
      }
    });
  }
  public pagecontrolview(context context) {
    super(context);
    this.init(context);
  }
  public pagecontrolview(context context, attributeset attrs) {
    super(context, attrs);
    this.init(context);
  }
  private void init(context context) {
    this.context=context;
  }
  private void generatepagecontrol(int currentindex) {
    this.removeallviews();
    int pagenum = 6; // 显示多少个
    int pageno = currentindex+1; //第几页
    int pagesum = this.count; //总共多少页
    if(pagesum>1){
      int currentnum = (pageno % pagenum == 0 ? (pageno / pagenum) - 1
           : (int) (pageno / pagenum))
           * pagenum;
       if (currentnum < 0)
         currentnum = 0;
       if (pageno > pagenum){
         imageview imageview = new imageview(context);
         imageview.setimageresource(r.drawable.zuo);
         this.addview(imageview);
       }
       for (int i = 0; i < pagenum; i++) {
         if ((currentnum + i + 1) > pagesum || pagesum < 2)
           break;
         imageview imageview = new imageview(context);
         if(currentnum + i + 1 == pageno){
           imageview.setimageresource(r.drawable.page_indicator_focused);
         }else{
           imageview.setimageresource(r.drawable.page_indicator);
         }
         this.addview(imageview);
       }
       if (pagesum > (currentnum + pagenum)) {
         imageview imageview = new imageview(context);
         imageview.setimageresource(r.drawable.you);
         this.addview(imageview);
       }
    }
  }
}

java代码：

package cn.anycall.ju;
import android.content.context;
import android.graphics.canvas;
import android.util.attributeset;
import android.util.log;
import android.view.motionevent;
import android.view.velocitytracker;
import android.view.view;
import android.view.viewconfiguration;
import android.view.viewgroup;
import android.widget.scroller;
/**
 * 仿launcher中的worksapce，可以左右滑动切换屏幕的类
 *
 */
public class scrolllayout extends viewgroup {
  private static final string tag = "scrolllayout";
  private scroller mscroller;
  private velocitytracker mvelocitytracker;
  private int mcurscreen;
  private int mdefaultscreen = 0;
  private static final int touch_state_rest = 0;
  private static final int touch_state_scrolling = 1;
  private static final int snap_velocity = 600;
  private int mtouchstate = touch_state_rest;
  private int mtouchslop;
  private float mlastmotionx;
  private float mlastmotiony;
  private int currentscreenindex = 0;
  public int getcurrentscreenindex() {
    return currentscreenindex;
  }
  public void setcurrentscreenindex(int currentscreenindex) {
    this.currentscreenindex = currentscreenindex;
  }
  public scrolllayout(context context, attributeset attrs) {
    this(context, attrs, 0);
    // todo auto-generated constructor stub
  }
  public scrolllayout(context context, attributeset attrs, int defstyle) {
    super(context, attrs, defstyle);
    // todo auto-generated constructor stub
    mscroller = new scroller(context);
    mcurscreen = mdefaultscreen;
    mtouchslop = viewconfiguration.get(getcontext()).getscaledtouchslop();
  }
  @override
  protected void onlayout(boolean changed, int l, int t, int r, int b) {
    // todo auto-generated method stub
    int childleft = 0;
    final int childcount = getchildcount();
    system.out.println("childcount=" + childcount);
    for (int i = 0; i < childcount; i++) {
      final view childview = getchildat(i);
      if (childview.getvisibility() != view.gone) {
        final int childwidth = childview.getmeasuredwidth();
        childview.layout(childleft, 0, childleft + childwidth,
            childview.getmeasuredheight());
        childleft += childwidth;
      }
    }
  }
  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    log.e(tag, "onmeasure");
    super.onmeasure(widthmeasurespec, heightmeasurespec);
    final int width = measurespec.getsize(widthmeasurespec);
    final int widthmode = measurespec.getmode(widthmeasurespec);
    if (widthmode != measurespec.exactly) {
      throw new illegalstateexception(
          "scrolllayout only canmcurscreen run at exactly mode!");
    }
    final int heightmode = measurespec.getmode(heightmeasurespec);
    if (heightmode != measurespec.exactly) {
      throw new illegalstateexception(
          "scrolllayout only can run at exactly mode!");
    }
    // the children are given the same width and height as the scrolllayout
    final int count = getchildcount();
    for (int i = 0; i < count; i++) {
      getchildat(i).measure(widthmeasurespec, heightmeasurespec);
    }
    system.out.println("moving to screen " + mcurscreen);
    scrollto(mcurscreen * width, 0);
  }
  /**
   * according to the position of current layout scroll to the destination
   * page.
   */
  public void snaptodestination() {
    final int screenwidth = getwidth();
    final int destscreen = (getscrollx() + screenwidth / 2) / screenwidth;
    snaptoscreen(destscreen);
  }
  public void snaptoscreen(int whichscreen) {
    // get the valid layout page
    whichscreen = math.max(0, math.min(whichscreen, getchildcount() - 1));
    if (getscrollx() != (whichscreen * getwidth())) {
      final int delta = whichscreen * getwidth() - getscrollx();
      mscroller.startscroll(getscrollx(), 0, delta, 0,
          math.abs(delta) * 2);
      mcurscreen = whichscreen;
      invalidate(); // redraw the layout
    }
  }
  public void settoscreen(int whichscreen) {
    whichscreen = math.max(0, math.min(whichscreen, getchildcount() - 1));
    mcurscreen = whichscreen;
    scrollto(whichscreen * getwidth(), 0);
  }
  public int getcurscreen() {
    return mcurscreen;
  }
  @override
  public void computescroll() {
    // todo auto-generated method stub
    if (mscroller.computescrolloffset()) {
      scrollto(mscroller.getcurrx(), mscroller.getcurry());
      postinvalidate();
    }
  }
  @override
  public boolean ontouchevent(motionevent event) {
    // todo auto-generated method stub
    if (mvelocitytracker == null) {
      mvelocitytracker = velocitytracker.obtain();
    }
    mvelocitytracker.addmovement(event);
    final int action = event.getaction();
    final float x = event.getx();
    final float y = event.gety();
    switch (action) {
    case motionevent.action_down:
      log.e(tag, "event down!");
      if (!mscroller.isfinished()) {
        mscroller.abortanimation();
      }
      mlastmotionx = x;
      break;
    case motionevent.action_move:
      int deltax = (int) (mlastmotionx - x);
      mlastmotionx = x;
      scrollby(deltax, 0);
      break;
    case motionevent.action_up:
      log.e(tag, "event : up");
      // if (mtouchstate == touch_state_scrolling) {
      final velocitytracker velocitytracker = mvelocitytracker;
      velocitytracker.computecurrentvelocity(1000);
      int velocityx = (int) velocitytracker.getxvelocity();
      log.e(tag, "velocityx:" + velocityx);
      if (velocityx > snap_velocity && mcurscreen > 0) {
        // fling enough to move left
        log.e(tag, "snap left");
        onscreenchangelistener.onscreenchange(mcurscreen - 1);
        system.out.println("mcurscreen=" + (mcurscreen - 1));
        snaptoscreen(mcurscreen - 1);
      } else if (velocityx < -snap_velocity
          && mcurscreen < getchildcount() - 1) {
        // fling enough to move right
        log.e(tag, "snap right");
        onscreenchangelistener.onscreenchange(mcurscreen + 1);
        //只往右移动才加载数据
        onscreenchangelistenerdataload.onscreenchange(mcurscreen+1);
        snaptoscreen(mcurscreen + 1);
      } else {
        snaptodestination();
      }
      if (mvelocitytracker != null) {
        mvelocitytracker.recycle();
        mvelocitytracker = null;
      }
      // }
      mtouchstate = touch_state_rest;
      break;
    case motionevent.action_cancel:
      mtouchstate = touch_state_rest;
      break;
    }
    return true;
  }
  @override
  public boolean onintercepttouchevent(motionevent ev) {
    // todo auto-generated method stub
    log.e(tag, "onintercepttouchevent-slop:" + mtouchslop);
    final int action = ev.getaction();
    if ((action == motionevent.action_move)
        && (mtouchstate != touch_state_rest)) {
      return true;
    }
    final float x = ev.getx();
    final float y = ev.gety();
    switch (action) {
    case motionevent.action_move:
      final int xdiff = (int) math.abs(mlastmotionx - x);
      if (xdiff > mtouchslop) {
        mtouchstate = touch_state_scrolling;
      }
      break;
    case motionevent.action_down:
      mlastmotionx = x;
      mlastmotiony = y;
      mtouchstate = mscroller.isfinished() ? touch_state_rest
          : touch_state_scrolling;
      break;
    case motionevent.action_cancel:
    case motionevent.action_up:
      mtouchstate = touch_state_rest;
      break;
    }
    return mtouchstate != touch_state_rest;
  }
  //分页监听
  public interface onscreenchangelistener {
    void onscreenchange(int currentindex);
  }
  private onscreenchangelistener onscreenchangelistener;
  public void setonscreenchangelistener(
      onscreenchangelistener onscreenchangelistener) {
    this.onscreenchangelistener = onscreenchangelistener;
  }
  //动态数据监听
  public interface onscreenchangelistenerdataload {
    void onscreenchange(int currentindex);
  }
  private onscreenchangelistenerdataload onscreenchangelistenerdataload;
  public void setonscreenchangelistenerdataload(onscreenchangelistenerdataload onscreenchangelistenerdataload) {
    this.onscreenchangelistenerdataload = onscreenchangelistenerdataload;
  }
}

java代码

package cn.anycall.ju;
import android.content.context;
import android.graphics.canvas;
import android.util.attributeset;
import android.util.log;
import android.view.motionevent;
import android.view.velocitytracker;
import android.view.view;
import android.view.viewconfiguration;
import android.view.viewgroup;
import android.widget.scroller;
/**
 * 仿launcher中的worksapce，可以左右滑动切换屏幕的类
 *
 */
public class scrolllayout extends viewgroup {
  private static final string tag = "scrolllayout";
  private scroller mscroller;
  private velocitytracker mvelocitytracker;
  private int mcurscreen;
  private int mdefaultscreen = 0;
  private static final int touch_state_rest = 0;
  private static final int touch_state_scrolling = 1;
  private static final int snap_velocity = 600;
  private int mtouchstate = touch_state_rest;
  private int mtouchslop;
  private float mlastmotionx;
  private float mlastmotiony;
  private int currentscreenindex = 0;
  public int getcurrentscreenindex() {
    return currentscreenindex;
  }
  public void setcurrentscreenindex(int currentscreenindex) {
    this.currentscreenindex = currentscreenindex;
  }
  public scrolllayout(context context, attributeset attrs) {
    this(context, attrs, 0);
    // todo auto-generated constructor stub
  }
  public scrolllayout(context context, attributeset attrs, int defstyle) {
    super(context, attrs, defstyle);
    // todo auto-generated constructor stub
    mscroller = new scroller(context);
    mcurscreen = mdefaultscreen;
    mtouchslop = viewconfiguration.get(getcontext()).getscaledtouchslop();
  }
  @override
  protected void onlayout(boolean changed, int l, int t, int r, int b) {
    // todo auto-generated method stub
    int childleft = 0;
    final int childcount = getchildcount();
    system.out.println("childcount=" + childcount);
    for (int i = 0; i < childcount; i++) {
      final view childview = getchildat(i);
      if (childview.getvisibility() != view.gone) {
        final int childwidth = childview.getmeasuredwidth();
        childview.layout(childleft, 0, childleft + childwidth,
            childview.getmeasuredheight());
        childleft += childwidth;
      }
    }
  }
  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    log.e(tag, "onmeasure");
    super.onmeasure(widthmeasurespec, heightmeasurespec);
    final int width = measurespec.getsize(widthmeasurespec);
    final int widthmode = measurespec.getmode(widthmeasurespec);
    if (widthmode != measurespec.exactly) {
      throw new illegalstateexception(
          "scrolllayout only canmcurscreen run at exactly mode!");
    }
    final int heightmode = measurespec.getmode(heightmeasurespec);
    if (heightmode != measurespec.exactly) {
      throw new illegalstateexception(
          "scrolllayout only can run at exactly mode!");
    }
    // the children are given the same width and height as the scrolllayout
    final int count = getchildcount();
    for (int i = 0; i < count; i++) {
      getchildat(i).measure(widthmeasurespec, heightmeasurespec);
    }
    system.out.println("moving to screen " + mcurscreen);
    scrollto(mcurscreen * width, 0);
  }
  /**
   * according to the position of current layout scroll to the destination
   * page.
   */
  public void snaptodestination() {
    final int screenwidth = getwidth();
    final int destscreen = (getscrollx() + screenwidth / 2) / screenwidth;
    snaptoscreen(destscreen);
  }
  public void snaptoscreen(int whichscreen) {
    // get the valid layout page
    whichscreen = math.max(0, math.min(whichscreen, getchildcount() - 1));
    if (getscrollx() != (whichscreen * getwidth())) {
      final int delta = whichscreen * getwidth() - getscrollx();
      mscroller.startscroll(getscrollx(), 0, delta, 0,
          math.abs(delta) * 2);
      mcurscreen = whichscreen;
      invalidate(); // redraw the layout
    }
  }
  public void settoscreen(int whichscreen) {
    whichscreen = math.max(0, math.min(whichscreen, getchildcount() - 1));
    mcurscreen = whichscreen;
    scrollto(whichscreen * getwidth(), 0);
  }
  public int getcurscreen() {
    return mcurscreen;
  }
  @override
  public void computescroll() {
    // todo auto-generated method stub
    if (mscroller.computescrolloffset()) {
      scrollto(mscroller.getcurrx(), mscroller.getcurry());
      postinvalidate();
    }
  }
  @override
  public boolean ontouchevent(motionevent event) {
    // todo auto-generated method stub
    if (mvelocitytracker == null) {
      mvelocitytracker = velocitytracker.obtain();
    }
    mvelocitytracker.addmovement(event);
    final int action = event.getaction();
    final float x = event.getx();
    final float y = event.gety();
    switch (action) {
    case motionevent.action_down:
      log.e(tag, "event down!");
      if (!mscroller.isfinished()) {
        mscroller.abortanimation();
      }
      mlastmotionx = x;
      break;
    case motionevent.action_move:
      int deltax = (int) (mlastmotionx - x);
      mlastmotionx = x;
      scrollby(deltax, 0);
      break;
    case motionevent.action_up:
      log.e(tag, "event : up");
      // if (mtouchstate == touch_state_scrolling) {
      final velocitytracker velocitytracker = mvelocitytracker;
      velocitytracker.computecurrentvelocity(1000);
      int velocityx = (int) velocitytracker.getxvelocity();
      log.e(tag, "velocityx:" + velocityx);
      if (velocityx > snap_velocity && mcurscreen > 0) {
        // fling enough to move left
        log.e(tag, "snap left");
        onscreenchangelistener.onscreenchange(mcurscreen - 1);
        system.out.println("mcurscreen=" + (mcurscreen - 1));
        snaptoscreen(mcurscreen - 1);
      } else if (velocityx < -snap_velocity
          && mcurscreen < getchildcount() - 1) {
        // fling enough to move right
        log.e(tag, "snap right");
        onscreenchangelistener.onscreenchange(mcurscreen + 1);
        //只往右移动才加载数据
        onscreenchangelistenerdataload.onscreenchange(mcurscreen+1);
        snaptoscreen(mcurscreen + 1);
      } else {
        snaptodestination();
      }
      if (mvelocitytracker != null) {
        mvelocitytracker.recycle();
        mvelocitytracker = null;
      }
      // }
      mtouchstate = touch_state_rest;
      break;
    case motionevent.action_cancel:
      mtouchstate = touch_state_rest;
      break;
    }
    return true;
  }
  @override
  public boolean onintercepttouchevent(motionevent ev) {
    // todo auto-generated method stub
    log.e(tag, "onintercepttouchevent-slop:" + mtouchslop);
    final int action = ev.getaction();
    if ((action == motionevent.action_move)
        && (mtouchstate != touch_state_rest)) {
      return true;
    }
    final float x = ev.getx();
    final float y = ev.gety();
    switch (action) {
    case motionevent.action_move:
      final int xdiff = (int) math.abs(mlastmotionx - x);
      if (xdiff > mtouchslop) {
        mtouchstate = touch_state_scrolling;
      }
      break;
    case motionevent.action_down:
      mlastmotionx = x;
      mlastmotiony = y;
      mtouchstate = mscroller.isfinished() ? touch_state_rest
          : touch_state_scrolling;
      break;
    case motionevent.action_cancel:
    case motionevent.action_up:
      mtouchstate = touch_state_rest;
      break;
    }
    return mtouchstate != touch_state_rest;
  }
  //分页监听
  public interface onscreenchangelistener {
    void onscreenchange(int currentindex);
  }
  private onscreenchangelistener onscreenchangelistener;
  public void setonscreenchangelistener(
      onscreenchangelistener onscreenchangelistener) {
    this.onscreenchangelistener = onscreenchangelistener;
  }
  //动态数据监听
  public interface onscreenchangelistenerdataload {
    void onscreenchange(int currentindex);
  }
  private onscreenchangelistenerdataload onscreenchangelistenerdataload;
  public void setonscreenchangelistenerdataload(onscreenchangelistenerdataload onscreenchangelistenerdataload) {
    this.onscreenchangelistenerdataload = onscreenchangelistenerdataload;
  }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
  <textview android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:text="仿淘宝聚划算"/>
<relativelayout
  android:id="@+id/myview"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
<cn.anycall.ju.scrolllayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/scrolllayouttest"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent" android:background="#000000" >
</cn.anycall.ju.scrolllayout>
<cn.anycall.ju.pagecontrolview
        android:id="@+id/pagecontrol"
        android:layout_width="fill_parent"
        android:layout_height="40px"
        android:background="#8f00000f"
        android:layout_alignparentbottom="true"
        android:gravity="center"/>
</relativelayout>
</linearlayout>

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
  <textview android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:text="仿淘宝聚划算"/>
<relativelayout
  android:id="@+id/myview"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
<cn.anycall.ju.scrolllayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/scrolllayouttest"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent" android:background="#000000" >
</cn.anycall.ju.scrolllayout>
<cn.anycall.ju.pagecontrolview
        android:id="@+id/pagecontrol"
        android:layout_width="fill_parent"
        android:layout_height="40px"
        android:background="#8f00000f"
        android:layout_alignparentbottom="true"
        android:gravity="center"/>
</relativelayout>
</linearlayout>

app_item.xml

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<relativelayout android:id="@+id/alllayout" android:layout_width="wrap_content" android:layout_height="wrap_content">
   <relativelayout android:id="@+id/imglayout" android:layout_width="160dp" android:layout_height="160dp" android:background="@drawable/mer_border">
        <imageview android:id="@+id/imgdetail" android:layout_width="145dp" android:layout_height="145dp" android:layout_margin="8dp" />
        <textview android:id="@+id/price" android:layout_width="180dp" android:layout_height="wrap_content" android:text="12345" android:layout_alignparentbottom="true" android:background="#c02000" android:textcolor="#ffffff"/>
        <textview android:id="@+id/look" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="去看看" android:layout_alignparentbottom="true" android:layout_alignparentright="true" android:background="#c02000" android:textcolor="#ffffff"/>
   </relativelayout>
   <textview android:id="@+id/tuaninfo" android:layout_width="fill_parent"
   android:layout_height="wrap_content" android:textsize="16dp"
   android:maxlines="2" android:layout_below="@id/imglayout"
    android:ellipsize="end" android:text="dddddddddd"/>"
</relativelayout>
</relativelayout>

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<relativelayout android:id="@+id/alllayout" android:layout_width="wrap_content" android:layout_height="wrap_content">
   <relativelayout android:id="@+id/imglayout" android:layout_width="160dp" android:layout_height="160dp" android:background="@drawable/mer_border">
        <imageview android:id="@+id/imgdetail" android:layout_width="145dp" android:layout_height="145dp" android:layout_margin="8dp" />
        <textview android:id="@+id/price" android:layout_width="180dp" android:layout_height="wrap_content" android:text="12345" android:layout_alignparentbottom="true" android:background="#c02000" android:textcolor="#ffffff"/>
        <textview android:id="@+id/look" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="去看看" android:layout_alignparentbottom="true" android:layout_alignparentright="true" android:background="#c02000" android:textcolor="#ffffff"/>
   </relativelayout>
   <textview android:id="@+id/tuaninfo" android:layout_width="fill_parent"
   android:layout_height="wrap_content" android:textsize="16dp"
   android:maxlines="2" android:layout_below="@id/imglayout"
    android:ellipsize="end" android:text="dddddddddd"/>"
</relativelayout>
</relativelayout>

更多关于android相关内容感兴趣的读者可查看本站专题：《android图形与图像处理技巧总结》、《android开发入门与进阶教程》、《android调试技巧与常见问题解决方法汇总》、《android多媒体操作技巧汇总(音频,视频,录音等)》、《android基本组件用法总结》、《android视图view技巧总结》、《android布局layout技巧总结》及《android控件用法总结》

希望本文所述对大家android程序设计有所帮助。

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Android开发中滑动分页功能实例详解

2019年07月24日 | 移动技术网移动技术 | 我要评论

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