现在的大多数应用都会有一个欢迎引导页面，

需求分析：

程序安装后第一次启动：

启动页-->功能引导页-->应用主页

以后启动:

启动页-->应用主页

实现原理：

用SharedPreferences实现。

创建一个boolean的变量，默认值为true。

当判断这个变量是true的时候，说明是第一次运行，就跳转到另一个引导页面。

引导页面跳转到最后一张图片时，点击某按钮发生跳转事件，回到MainActivity,此时把变量的值改成false。

引导图效果用ViewPager可以很轻松的实现。

1.布局文件

splash.xml:

1

    xmlns:tools="http://schemas.android.com/tools"3    android:layout_width="match_parent"4    android:layout_height="match_parent"5    tools:context=".SplashActivity">67android:layout_width="match_parent"9        android:layout_height="match_parent"10        android:adjustViewBounds="true"11        android:background="@drawable/welcome_android"12        android:scaleType="centerCrop"/>1314

guide.xml:

1

<?xml  version="1.0" encoding="utf-8"?>2    android:layout_width="match_parent"4    android:layout_height="match_parent"5    android:orientation="vertical">67        android:id="@+id/viewpager"9        android:layout_width="match_parent"10        android:layout_height="match_parent"/>1112android:id="@+id/ll"14        android:layout_width="wrap_content"15        android:layout_height="wrap_content"16        android:layout_alignParentBottom="true"17        android:layout_centerHorizontal="true"18        android:layout_marginBottom="24.0dp"19        android:orientation="horizontal">2021android:layout_width="wrap_content"23            android:layout_height="wrap_content"24            android:layout_gravity="center_vertical"25            android:clickable="true"26            android:padding="15.0dip"27            android:src="@drawable/dot"/>2829android:layout_width="wrap_content"31            android:layout_height="wrap_content"32            android:layout_gravity="center_vertical"33            android:clickable="true"34            android:padding="15.0dip"35            android:src="@drawable/dot"/>3637android:layout_width="wrap_content"39            android:layout_height="wrap_content"40            android:layout_gravity="center_vertical"41            android:clickable="true"42            android:padding="15.0dip"43            android:src="@drawable/dot"/>4445android:layout_width="wrap_content"47            android:layout_height="wrap_content"48            android:layout_gravity="center_vertical"49            android:clickable="true"50            android:padding="15.0dip"51            android:src="@drawable/dot"/>525354

main_activity.xml默认

what_new_one.xml、what_new_two.xml、what_new_three.xml(将图片名称改下就行了):

1

<?xml  version="1.0" encoding="utf-8"?>2    android:layout_width="match_parent"4    android:layout_height="match_parent">56android:layout_width="match_parent"8        android:layout_height="match_parent"9        android:layout_centerInParent="true"10        android:adjustViewBounds="false"11        android:focusable="true"12        android:scaleType="centerCrop"13        android:background="@drawable/guide_350_01"/>1415

what_new_four.xml:

1

<?xml  version="1.0" encoding="utf-8"?>2    android:layout_width="match_parent"4    android:layout_height="match_parent">56android:layout_width="match_parent"8        android:layout_height="match_parent"9        android:layout_centerInParent="true"10        android:adjustViewBounds="false"11        android:background="@drawable/guide_350_04"12        android:focusable="true"13        android:scaleType="centerCrop"/>1415android:id="@+id/iv_start_weibo"17        android:layout_width="wrap_content"18        android:layout_height="wrap_content"19        android:layout_alignParentBottom="true"20        android:layout_centerHorizontal="true"21        android:layout_marginBottom="108dp"22        android:background="@drawable/whats_new_start_btn"23        android:focusable="true"/>2425

MainActivity.java不变

SplashActivity.java:

1

packagecn.eoe.leigo.splash;23importandroid.app.Activity;4importandroid.content.Intent;5importandroid.content.SharedPreferences;6importandroid.os.Bundle;7importandroid.os.Handler;8importandroid.os.Message;910

/** *//**11 *12 * @{# SplashActivity.java Create on 2013-5-2 下午9:10:0113 *14 *     class desc: 启动画面 (1)判断是否是首次加载应用--采取读取SharedPreferences的方法15 *     (2)是，则进入GuideActivity；否，则进入MainActivity (3)3s后执行(2)操作16 *17 *

18 *     Copyright: Copyright(c) 201319 *

20 * @Version 1.021 * @Author Leo22 *23 *24*/25

publicclassSplashActivityextendsActivity{26booleanisFirstIn=false;2728privatestaticfinalintGO_HOME=1000;29privatestaticfinalintGO_GUIDE=1001;30//延迟3秒31privatestaticfinallongSPLASH_DELAY_MILLIS=3000;3233privatestaticfinalString SHAREDPREFERENCES_NAME="first_pref";3435

/** *//**36     * Handler:跳转到不同界面37*/38

privateHandler mHandler=newHandler(){3940        @Override41

publicvoidhandleMessage(Message msg){42

switch(msg.what){43caseGO_HOME:44                goHome();45break;46caseGO_GUIDE:47                goGuide();48break;49            }50super.handleMessage(msg);51        }52    };5354    @Override55

protectedvoidonCreate(Bundle savedInstanceState){56super.onCreate(savedInstanceState);57        setContentView(R.layout.splash);5859        init();60    }6162

privatevoidinit(){63//读取SharedPreferences中需要的数据64//使用SharedPreferences来记录程序的使用次数65SharedPreferences preferences=getSharedPreferences(66                SHAREDPREFERENCES_NAME, MODE_PRIVATE);6768//取得相应的值，如果没有该值，说明还未写入，用true作为默认值69isFirstIn=preferences.getBoolean("isFirstIn",true);7071//判断程序与第几次运行，如果是第一次运行则跳转到引导界面，否则跳转到主界面72

if(!isFirstIn){73//使用Handler的postDelayed方法，3秒后执行跳转到MainActivity74mHandler.sendEmptyMessageDelayed(GO_HOME, SPLASH_DELAY_MILLIS);75

        }else{76            mHandler.sendEmptyMessageDelayed(GO_GUIDE, SPLASH_DELAY_MILLIS);77        }7879    }8081

privatevoidgoHome(){82        Intent intent=newIntent(SplashActivity.this, MainActivity.class);83        SplashActivity.this.startActivity(intent);84        SplashActivity.this.finish();85    }8687

privatevoidgoGuide(){88        Intent intent=newIntent(SplashActivity.this, GuideActivity.class);89        SplashActivity.this.startActivity(intent);90        SplashActivity.this.finish();91    }92}93

GuideActivity.java:

1

packagecn.eoe.leigo.splash;23importjava.util.ArrayList;4importjava.util.List;56importandroid.app.Activity;7importandroid.os.Bundle;8importandroid.support.v4.view.ViewPager;9importandroid.support.v4.view.ViewPager.OnPageChangeListener;10importandroid.view.LayoutInflater;11importandroid.view.View;12importandroid.widget.ImageView;13importandroid.widget.LinearLayout;14importcn.eoe.leigo.splash.adapter.ViewPagerAdapter;1516

/** *//**17 *18 * @{# GuideActivity.java Create on 2013-5-2 下午10:59:0819 *20 *     class desc: 引导界面21 *22 *

23 *     Copyright: Copyright(c) 201324 *

25 * @Version 1.026 * @Author Leo27 *28 *29*/30

publicclassGuideActivityextendsActivityimplementsOnPageChangeListener{3132privateViewPager vp;33privateViewPagerAdapter vpAdapter;34privateListviews;3536//底部小点图片37privateImageView[] dots;3839//记录当前选中位置40privateintcurrentIndex;4142    @Override43

protectedvoidonCreate(Bundle savedInstanceState){44super.onCreate(savedInstanceState);45        setContentView(R.layout.guide);4647//初始化页面48initViews();4950//初始化底部小点51initDots();52    }5354

privatevoidinitViews(){55        LayoutInflater inflater=LayoutInflater.from(this);5657        views=newArrayList();58//初始化引导图片列表59views.add(inflater.inflate(R.layout.what_new_one,null));60        views.add(inflater.inflate(R.layout.what_new_two,null));61        views.add(inflater.inflate(R.layout.what_new_three,null));62        views.add(inflater.inflate(R.layout.what_new_four,null));6364//初始化Adapter65vpAdapter=newViewPagerAdapter(views,this);6667        vp=(ViewPager) findViewById(R.id.viewpager);68        vp.setAdapter(vpAdapter);69//绑定回调70vp.setOnPageChangeListener(this);71    }7273

privatevoidinitDots(){74        LinearLayout ll=(LinearLayout) findViewById(R.id.ll);7576        dots=newImageView[views.size()];7778//循环取得小点图片79

for(inti=0; i{80            dots[i]=(ImageView) ll.getChildAt(i);81            dots[i].setEnabled(true);//都设为灰色82}8384        currentIndex=0;85        dots[currentIndex].setEnabled(false);//设置为白色，即选中状态86}8788

privatevoidsetCurrentDot(intposition){89if(position<0||position>views.size()-190

||currentIndex==position){91return;92        }9394        dots[position].setEnabled(false);95        dots[currentIndex].setEnabled(true);9697        currentIndex=position;98    }99100//当滑动状态改变时调用101@Override102

publicvoidonPageScrollStateChanged(intarg0){103    }104105//当当前页面被滑动时调用106@Override107

publicvoidonPageScrolled(intarg0,floatarg1,intarg2){108    }109110//当新的页面被选中时调用111@Override112

publicvoidonPageSelected(intarg0){113//设置底部小点选中状态114setCurrentDot(arg0);115    }116117}118

ViewPagerAdapter.java:

1

packagecn.eoe.leigo.splash.adapter;23importjava.util.List;45importandroid.app.Activity;6importandroid.content.Context;7importandroid.content.Intent;8importandroid.content.SharedPreferences;9importandroid.content.SharedPreferences.Editor;10importandroid.os.Parcelable;11importandroid.support.v4.view.PagerAdapter;12importandroid.support.v4.view.ViewPager;13importandroid.view.View;14importandroid.view.View.OnClickListener;15importandroid.widget.ImageView;16importcn.eoe.leigo.splash.MainActivity;17importcn.eoe.leigo.splash.R;1819

/** *//**20 *21 * @{# ViewPagerAdapter.java Create on 2013-5-2 下午11:03:3922 *23 *     class desc: 引导页面适配器24 *25 *

26 *     Copyright: Copyright(c) 201327 *

28 * @Version 1.029 * @Author Leo30 *31 *32*/33

publicclassViewPagerAdapterextendsPagerAdapter{3435//界面列表36privateListviews;37privateActivity activity;3839privatestaticfinalString SHAREDPREFERENCES_NAME="first_pref";4041

publicViewPagerAdapter(Listviews, Activity activity){42this.views=views;43this.activity=activity;44    }4546//销毁arg1位置的界面47@Override48

publicvoiddestroyItem(View arg0,intarg1, Object arg2){49        ((ViewPager) arg0).removeView(views.get(arg1));50    }5152    @Override53

publicvoidfinishUpdate(View arg0){54    }5556//获得当前界面数57@Override58

publicintgetCount(){59

if(views!=null){60returnviews.size();61        }62return0;63    }6465//初始化arg1位置的界面66@Override67

publicObject instantiateItem(View arg0,intarg1){68        ((ViewPager) arg0).addView(views.get(arg1),0);69

if(arg1==views.size()-1){70            ImageView mStartWeiboImageButton=(ImageView) arg071                    .findViewById(R.id.iv_start_weibo);72

            mStartWeiboImageButton.setOnClickListener(newOnClickListener(){7374                @Override75

publicvoidonClick(View v){76//设置已经引导77setGuided();78                    goHome();7980                }8182            });83        }84returnviews.get(arg1);85    }8687

privatevoidgoHome(){88//跳转89Intent intent=newIntent(activity, MainActivity.class);90        activity.startActivity(intent);91        activity.finish();92    }9394

/** *//**95     *96     * method desc：设置已经引导过了，下次启动不用再次引导97*/98

privatevoidsetGuided(){99        SharedPreferences preferences=activity.getSharedPreferences(100                SHAREDPREFERENCES_NAME, Context.MODE_PRIVATE);101        Editor editor=preferences.edit();102//存入数据103editor.putBoolean("isFirstIn",false);104//提交修改105editor.commit();106    }107108//判断是否由对象生成界面109@Override110

publicbooleanisViewFromObject(View arg0, Object arg1){111return(arg0==arg1);112    }113114    @Override115

publicvoidrestoreState(Parcelable arg0, ClassLoader arg1){116    }117118    @Override119

publicParcelable saveState(){120returnnull;121    }122123    @Override124

publicvoidstartUpdate(View arg0){125    }126127}128