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:

 

Android实现左右滑动指引效果  Android实现左右滑动指引效果

 

Android实现左右滑动指引效果  Android实现左右滑动指引效果

 

  Android实现左右滑动指引效果  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:

 

Android实现左右滑动指引效果 

 

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