Android编程实现的首页左右滑动切换功能示例

本文实例讲述了android编程实现的首页左右滑动切换功能。分享给大家供大家参考，具体如下：

很多软件会选择左右滑动的主界面，实现方式也很多，这里的仅供参考，勿喷。

不多说什么了，相信大家看看代码就明白，自己也不善言辞，望大家谅解。

自定义接口，监听滑动翻页事件：

/** 滑动后翻页事件 */
public interface onviewchangedlistener {
  public void onviewchanged(int viewid);
}

滑动翻页view（滑动翻页不是很灵敏）：

import android.content.context;
import android.graphics.canvas;
import android.graphics.pointf;
import android.graphics.drawable.drawable;
import android.util.attributeset;
import android.view.motionevent;
import android.view.view;
import android.view.viewconfiguration;
import android.widget.framelayout;
import android.widget.scroller;
public class scrollerview extends framelayout {
  private scroller scroller;
  private drawable drawable;
  private onviewchangedlistener listener;
  public scrollerview(context context) {
    this(context, null, 0);
  }
  public scrollerview(context context, attributeset attrs) {
    this(context, attrs, 0);
  }
  public scrollerview(context context, attributeset attrs, int defstyle) {
    super(context, attrs, defstyle);
    scroller = new scroller(context);
  }
  private pointf last = new pointf();
  private final int touch_slop = viewconfiguration.get(getcontext())
      .getscaledtouchslop();
  @override
  public boolean onintercepttouchevent(motionevent event) {
    final int x = (int) event.getx();
    boolean flag = false;
    switch (event.getaction()) {
    case motionevent.action_down:
      last.x = x;
      break;
    case motionevent.action_move:
      final int deltax = (int) (last.x - x);
      if (math.abs(deltax) > touch_slop) {
        flag = true;
      }
      break;
    case motionevent.action_up:
      break;
    }
    return flag;
  }
  public boolean ontouchevent(motionevent event) {
    final int x = (int) event.getx();
    final int width = getwidth();
    switch (event.getaction()) {
    case motionevent.action_down:
      if (!scroller.isfinished()) {
        scroller.abortanimation();
      }
      break;
    case motionevent.action_move:
      final int deltax = (int) (last.x - x);
      if (math.abs(deltax) < touch_slop) {
        break;
      }
      last.x = x;
      if (deltax < 0) {
        if (getscrollx() > 0) {
          scrollby(math.max(-getscrollx(), deltax), 0);
        }
      } else if (deltax > 0) {
        final int availabletoscroll = getchildat(getchildcount() - 1)
            .getright() - getscrollx() - getwidth();
        if (availabletoscroll > 0) {
          scrollby(math.min(availabletoscroll, deltax), 0);
        }
      }
      break;
    case motionevent.action_up:
    case motionevent.action_cancel:
      final onviewchangedlistener changedlistener = listener;
      int dx = (getscrollx() + width / 2) / width;
      if (dx < 0) {
        dx = 0;
      }
      if (dx > getchildcount() - 1) {
        dx = getchildcount() - 1;
      }
      changedlistener.onviewchanged(dx);
      dx *= width;
      dx -= getscrollx();
      scroller.startscroll(getscrollx(), 0, dx, 0, math.abs(dx) * 3);
      break;
    }
    invalidate();
    return true;
  }
  @override
  protected void onlayout(boolean changed, int l, int t, int r, int b) {
    final int width = getwidth();
    final int count = getchildcount();
    int height = getheight();
    int childleft = 0;
    for (int i = 0; i < count; i++) {
      final view child = getchildat(i);
      child.layout(childleft, 0, childleft + width, height);
      childleft += width;
    }
  }
  @override
  public void setbackgrounddrawable(drawable d) {
    super.setbackgrounddrawable(drawable);
    drawable = d;
    super.setbackgrounddrawable(null);
  }
  @override
  protected void dispatchdraw(canvas canvas) {
    if (null != drawable) {
      drawable.setbounds(0, 0, getchildcount() * getwidth(), getheight());
      drawable.draw(canvas);
    }
    super.dispatchdraw(canvas);
  }
  @override
  public void computescroll() {
    if (scroller.computescrolloffset()) {
      scrollto(scroller.getcurrx(), scroller.getcurry());
      invalidate();
    }
  }
  /** 设置滑动后翻页事件监听 */
  public void setonviewchangedlistener(onviewchangedlistener listener) {
    this.listener = listener;
  }
}

主activity：

import android.app.activity;
import android.os.bundle;
import android.view.layoutinflater;
import android.view.view;
import android.view.window;
import android.widget.imageview;
public class mainactivity extends activity implements onviewchangedlistener {
  private scrollerview container;
  private view view_1, view_2;
  private imageview imgleft, imgright;
  @override
  public void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    requestwindowfeature(window.feature_no_title);
    setcontentview(r.layout.main);
    initview();
  }
  private void initview() {
    layoutinflater inflater = layoutinflater.from(this);
    container = (scrollerview) findviewbyid(r.id.main_container);
    container.setonviewchangedlistener(this);
    imgleft = (imageview) findviewbyid(r.id.img_left);
    imgright = (imageview) findviewbyid(r.id.img_right);
    view_1 = inflater.inflate(r.layout.layout_view_1, null);
    view_2 = inflater.inflate(r.layout.layout_view_2, null);
    container.addview(view_1);
    container.addview(view_2);
  }
  @override
  public void onviewchanged(int viewid) {
    switch (viewid) {
    case 0:
      imgleft.setimageresource(r.drawable.main_icon_check);
      imgright.setimageresource(r.drawable.main_icon_normal);
      break;
    case 1:
      imgleft.setimageresource(r.drawable.main_icon_normal);
      imgright.setimageresource(r.drawable.main_icon_check);
      break;
    }
  }
}

附：完整实例代码点击此处本站下载。

更多关于android相关内容感兴趣的读者可查看本站专题：《android布局layout技巧总结》、《android视图view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》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。