Android实现左右滑动指引效果

本文介绍Android中实现左右滑动的指引效果。

关于左右滑动效果，我在以前的一篇博文中提到过，有兴趣的朋友可以查看：http://www.cnblogs.com/hanyonglu/archive/2012/02/13/2349827.html

如果想实现带渐显按钮的左右滑动效果，请访问博文：http://www.cnblogs.com/hanyonglu/archive/2012/02/13/2350171.html

本文的目的是要实现左右滑动的指引效果。那么什么是指引效果呢？现在的应用为了有更好的用户体验，一般会在应用开始显示一些指引帮助页面，使用户能更好的理解应用的功能，甚至是一些新闻阅读器会把一些头条新闻以指引效果的形式显示。说个最基本的，就是我们的手机主屏幕就是这种效果。

下面我们就开始实现我们的左右滑动指引效果。为了大家更好的理解，我们先看下实现效果，如下图所示：













在这里，我们需要用到google提到的一个包——android-support-v4.jar，这个包是为了方便实现android view之间的切换，关于android-support-v4.jar的详细信息，大家可以访问google官方网站：http://developer.android.com/sdk/compatibility-library.html

首先我们先看下项目结构：



核心实现代码如下所示：




package com.test.guide;

import java.util.ArrayList;

import android.app.Activity;

import android.os.Bundle;

import android.os.Parcelable;

import android.support.v4.view.PagerAdapter;

import android.support.v4.view.ViewPager;

import android.support.v4.view.ViewPager.OnPageChangeListener;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.view.Window;

import android.view.ViewGroup.LayoutParams;

import android.widget.ImageView;

/**

* Android实现左右滑动指引效果
* @Description: Android实现左右滑动指引效果

* @File: MyGuideViewActivity.java

* @Package com.test.guide

* @Author Hanyonglu

* @Date 2012-4-6 下午11:15:18

* @Version V1.0

*/

public
class MyGuideViewActivity
extends Activity {

private ViewPager viewPager;

private ArrayList<View> pageViews;

private ImageView imageView;

private ImageView[] imageViews;

//
包裹滑动图片LinearLayout

private ViewGroup main;

//
包裹小圆点的LinearLayout

private ViewGroup group;

/**
Called when the activity is first created.
*/

@Override

public
void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//
设置无标题窗口

requestWindowFeature(Window.FEATURE_NO_TITLE);

LayoutInflater inflater = getLayoutInflater();

pageViews =
new ArrayList<View>();

pageViews.add(inflater.inflate(R.layout.item05,
null));

pageViews.add(inflater.inflate(R.layout.item06,
null));

pageViews.add(inflater.inflate(R.layout.item01,
null));

pageViews.add(inflater.inflate(R.layout.item02,
null));

pageViews.add(inflater.inflate(R.layout.item03,
null));

pageViews.add(inflater.inflate(R.layout.item04,
null));

imageViews =
new ImageView[pageViews.size()];

main = (ViewGroup)inflater.inflate(R.layout.main,
null);

group = (ViewGroup)main.findViewById(R.id.viewGroup);

viewPager = (ViewPager)main.findViewById(R.id.guidePages);

for (
int i = 0; i < pageViews.size(); i++) {

imageView =
new ImageView(MyGuideViewActivity.
this);

imageView.setLayoutParams(
new LayoutParams(20,20));

imageView.setPadding(20, 0, 20, 0);

imageViews[i] = imageView;

if (i == 0) {

//
默认选中第一张图片

imageViews[i].setBackgroundResource(R.drawable.page_indicator_focused);

}
else {

imageViews[i].setBackgroundResource(R.drawable.page_indicator);

}

group.addView(imageViews[i]);

}

setContentView(main);

viewPager.setAdapter(
new GuidePageAdapter());

viewPager.setOnPageChangeListener(
new GuidePageChangeListener());

}

//
指引页面数据适配器

class GuidePageAdapter
extends PagerAdapter {

@Override

public
int getCount() {

return pageViews.size();

}

@Override

public
boolean isViewFromObject(View arg0, Object arg1) {

return arg0 == arg1;

}

@Override

public
int getItemPosition(Object object) {

//
TODO Auto-generated method stub

return
super.getItemPosition(object);

}

@Override

public
void destroyItem(View arg0,
int arg1, Object arg2) {

//
TODO Auto-generated method stub

((ViewPager) arg0).removeView(pageViews.get(arg1));

}

@Override

public Object instantiateItem(View arg0,
int arg1) {

//
TODO Auto-generated method stub

((ViewPager) arg0).addView(pageViews.get(arg1));

return pageViews.get(arg1);

}

@Override

public
void restoreState(Parcelable arg0, ClassLoader arg1) {

//
TODO Auto-generated method stub

}

@Override

public Parcelable saveState() {

//
TODO Auto-generated method stub

return
null;

}

@Override

public
void startUpdate(View arg0) {

//
TODO Auto-generated method stub

}

@Override

public
void finishUpdate(View arg0) {

//
TODO Auto-generated method stub

}

}

//
指引页面更改事件监听器

class GuidePageChangeListener
implements OnPageChangeListener {

@Override

public
void onPageScrollStateChanged(
int arg0) {

//
TODO Auto-generated method stub

}

@Override

public
void onPageScrolled(
int arg0,
float arg1,
int arg2) {

//
TODO Auto-generated method stub

}

@Override

public
void onPageSelected(
int arg0) {

for (
int i = 0; i < imageViews.length; i++) {

imageViews[arg0].setBackgroundResource(R.drawable.page_indicator_focused);

if (arg0 != i) {

imageViews[i].setBackgroundResource(R.drawable.page_indicator);

}

}

}

}

}




item.xml代码如下：




<?xml version="1.0" encoding="utf-8"?>
<
LinearLayout
xmlns:android
="http://schemas.android.com/apk/res/android"

android:layout_width
="fill_parent"

android:layout_height
="fill_parent"

android:orientation
="vertical"

>

<
LinearLayout

android:id
="@+id/linearLayout01"

android:layout_width
="match_parent"

android:layout_height
="wrap_content"

android:orientation
="vertical"

>

</
LinearLayout
>

<
LinearLayout

android:id
="@+id/linearLayout02"

android:layout_width
="match_parent"

android:layout_height
="wrap_content"

android:orientation
="vertical"

android:background
="@drawable/divider_horizontal_line"
>

</
LinearLayout
>

<
LinearLayout

android:id
="@+id/linearLayout1"

android:layout_width
="match_parent"

android:layout_height
="wrap_content"

android:orientation
="vertical"

>

<
ImageView

android:layout_width
="fill_parent"

android:layout_height
="wrap_content"

android:background
="@drawable/feature_guide_0"

>

</
ImageView
>

</
LinearLayout
>

<
LinearLayout

android:id
="@+id/linearLayout2"

android:layout_width
="wrap_content"

android:layout_height
="wrap_content"

android:orientation
="vertical"

android:background
="@drawable/bg"

>

<
LinearLayout

android:id
="@+id/linearLayout2"

android:layout_width
="wrap_content"

android:layout_height
="wrap_content"

android:orientation
="vertical"

android:layout_marginTop
="30px"

android:layout_marginBottom
="30px"

android:layout_marginLeft
="30px"

android:layout_marginRight
="30px"

android:background
="@drawable/divider_horizontal_line"

>

</
LinearLayout
>

<
LinearLayout

android:id
="@+id/linearLayout3"

android:layout_width
="match_parent"

android:layout_height
="wrap_content"

android:orientation
="vertical"

>

<
TextView

android:id
="@+id/textView1"

android:layout_width
="wrap_content"

android:layout_height
="wrap_content"

android:textColor
="#000000"

android:paddingLeft
="30px"

android:paddingRight
="30px"

android:text
="@string/text1"

/>

</
LinearLayout
>

</
LinearLayout
>

</LinearLayout>




以上便是实现大概步骤，示例下载地址：点击下载

最后，希望转载的朋友能够尊重作者的劳动成果，加上转载地址：http://www.cnblogs.com/hanyonglu/archive/2012/04/07/2435589.html 谢谢。

完毕。^_^