Android实现左右滑动指引效果?????? 在这里，我们需要用到google提到的一个包——android-support-v4.jar，这
Android实现左右滑动指引效果
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在这里，我们需要用到google提到的一个包——android-support-v4.jar，这个包包含了一些非常有用的类，其中就是ViewPager类来实现页面之间的切换操作，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
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首先我们先看下项目结构：
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在上图项目结构中，我们需要首先引入android-support-v4.jar包。下面让我们看一下代码实现。
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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;??
????????}??
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????????@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);??
????????}??
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????????@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??
??
????????}??
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????????@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);??
????????????????}??
????????????}
????????}??
????}??
}?
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在以前的示例中，我们实现左右滑动效果时通常使用ViewFlipper来实现，在这个示例中我使用的Google的android-support-v4.jar中的ViewPager类实现。在这里，我创建了6个页面布局，也就是6个页面之间的切换。首先需要把这个6个布局页面加入到集合中以方便操作，如下代码：
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));
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有几个布局页面就有几个圆点图片，如下代码：
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]); } ?
然后再为ViewPager设置数据适配器和页面切换事件监听器，如下代码：
@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); } }}?
下面是布局界面的代码，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>??
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在最上方的导航是一个单独的布局，通过include标签引用。
great~~~