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Android实现左右滑动指引效果


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:

 

Android实现左右滑动指引效果_layout

  

Android实现左右滑动指引效果_layout_02

Android实现左右滑动指引效果_google_03

  

Android实现左右滑动指引效果_google_04

 


Android实现左右滑动指引效果_null_05

 

Android实现左右滑动指引效果_google_06

 

 

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:

 

Android实现左右滑动指引效果_android_07

 

核心实现代码如下所示:

 


package
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,由于网速问题,代码我将会很快,敬请关注……。



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