Android实现左右滑动指引效果
openkk
12年前
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
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项目主页：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 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(); 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>
转自：http://www.cnblogs.com/hanyonglu/archive/2012/04/07/2435589.html