Android仿人人网滑动侧边栏效果

很多应用为了节省空间而又使界面能够充足的显示信息，大多数应用都采用了侧边栏的方式，如下图： 

     

来说说它的思路，底下是两个或多个视图，分别通过控制它们的宽度、左边距来控制它们的显示，来看看代码 

activity_main.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/layout"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="horizontal"
  tools:context=".mainactivity" >

  <linearlayout
    android:id="@+id/menu"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/menu" >
  </linearlayout>

  <linearlayout
    android:id="@+id/content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/content" >
  </linearlayout>

</linearlayout>

 mainactivity.java

 

public class mainactivity extends activity implements ontouchlistener
{

  private linearlayout menu;
  private linearlayout content;
  private layoutparams menuparams;
  private layoutparams contentparams;

  // menu完全显示时，留给content的宽度值。
  private static final int menupadding = 80;

  // 分辨率
  private int displaywidth;

  private float xdown;
  private float xmove;

  private boolean misshow = false;
  private static final int speed = 50;

  @override
  protected void oncreate(bundle savedinstancestate)
  {
    super.oncreate(savedinstancestate);
    requestwindowfeature(window.feature_no_title);
    setcontentview(r.layout.activity_main);

    displaywidth = getwindowmanager().getdefaultdisplay().getwidth();

    menu = (linearlayout) findviewbyid(r.id.menu);
    content = (linearlayout) findviewbyid(r.id.content);
    menuparams = (layoutparams) menu.getlayoutparams();
    contentparams = (layoutparams) content.getlayoutparams();
    findviewbyid(r.id.layout).setontouchlistener(this);

    menuparams.width = displaywidth - menupadding;
    contentparams.width = displaywidth;
    showmenu(misshow);
  }

  @override
  public boolean ontouch(view v, motionevent event)
  {
    switch (event.getaction())
    {
    case motionevent.action_down:
      showmenu(!misshow);
      break;
    case motionevent.action_move:
      break;
    case motionevent.action_up:
      break;
    }
    return true;
  }

  private void showmenu(boolean isshow)
  {
    if (isshow)
    {
      misshow = true;
      menuparams.leftmargin = 0;
    } else
    {
      misshow = false;
      menuparams.leftmargin = 0 - menuparams.width;
    }
    menu.setlayoutparams(menuparams);
  }
  }

    上述代码只是用两张图片代替了两个复杂的view(layout)，你会发现，两个视图虽然可以切换，但没有动画的感觉，再加上要有拖动效果，所以，我们再给它加个平移时间段，看起来有动画的效果 

 package com.example.test;

import android.app.activity;
import android.os.asynctask;
import android.os.bundle;
import android.util.log;
import android.view.motionevent;
import android.view.view;
import android.view.view.onclicklistener;
import android.view.view.ontouchlistener;
import android.view.window;
import android.widget.linearlayout;
import android.widget.linearlayout.layoutparams;

public class mainactivity extends activity implements ontouchlistener, onclicklistener
{

  private linearlayout menu;
  private linearlayout content;
  private layoutparams menuparams;
  private layoutparams contentparams;

  // menu完全显示时，留给content的宽度值。
  private static final int menupadding = 80;

  // 分辨率
  private int displaywidth;

  private float xdown;
  private float xmove;

  private boolean misshow = false;
  private static final int speed = 50;

  @override
  protected void oncreate(bundle savedinstancestate)
  {
    super.oncreate(savedinstancestate);
    requestwindowfeature(window.feature_no_title);
    setcontentview(r.layout.activity_main);

    displaywidth = getwindowmanager().getdefaultdisplay().getwidth();

    menu = (linearlayout) findviewbyid(r.id.menu);
    menu.setonclicklistener(this);
    content = (linearlayout) findviewbyid(r.id.content);
    content.setonclicklistener(this);
    menuparams = (layoutparams) menu.getlayoutparams();
    contentparams = (layoutparams) content.getlayoutparams();
    //findviewbyid(r.id.layout).setontouchlistener(this);

    menuparams.width = displaywidth - menupadding;
    contentparams.width = displaywidth;
    showmenu(misshow);
  }

  @override
  public void onclick(view v)
  {
    switch (v.getid())
    {
    case r.id.menu:
      new showmenuasynctask().execute(-50);
      break;
    case r.id.content:
      new showmenuasynctask().execute(50);
      break;
    }

  }

  @override
  public boolean ontouch(view v, motionevent event)
  {
    switch (event.getaction())
    {
    case motionevent.action_down:
      showmenu(!misshow);
      break;
    case motionevent.action_move:
      break;
    case motionevent.action_up:
      break;
    }
    return true;
  }

  private void showmenu(boolean isshow)
  {
    if (isshow)
    {
      misshow = true;
      menuparams.leftmargin = 0;
    } else
    {
      misshow = false;
      menuparams.leftmargin = 0 - menuparams.width;
    }
    menu.setlayoutparams(menuparams);
  }

  /**
  *
  *这是主要代码：模拟动画过程，也让我更熟悉了asynctask这玩意儿
  *
  */
  class showmenuasynctask extends asynctask<integer, integer, integer>
  {

    @override
    protected integer doinbackground(integer... params)
    {
      int leftmargin = menuparams.leftmargin;
      
      //这里也是值得学习的地方，如果在平常，自己肯定又是这样写:
      //  if(){
      //    while()
      // }
      //  else if(){
      //    while()
      // }
      while (true)
      {
        leftmargin += params[0];
        if (params[0] > 0 && leftmargin >= 0)
        {
          break;
        } else if (params[0] < 0 && leftmargin <= -menuparams.width)
        {
          break;
        }
        publishprogress(leftmargin);
        try
        {
          thread.sleep(30);
        } catch (interruptedexception e)
        {
          e.printstacktrace();
        }
      }
      return leftmargin;
    }

    @override
    protected void onprogressupdate(integer... values)
    {
      super.onprogressupdate(values);
      menuparams.leftmargin = values[0];
      menu.setlayoutparams(menuparams);
    }

    @override
    protected void onpostexecute(integer result)
    {
      super.onpostexecute(result);
      menuparams.leftmargin = result;
      menu.setlayoutparams(menuparams);
    }

  }

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。