【移動應用開發技術】AndroidAPP引導頁實現-第一次應用進入時加載

APP引導頁是每個優質APP必備的元素，下面我們研究一下如何只在第一次進入應用時進行加載引導頁的方法。1.判斷是否第一次進入應用的方法：package

com.yayun.guide;

import

android.app.Activity;

import

android.content.Context;

import

android.content.Intent;

import

android.content.SharedPreferences;

import

android.os.Bundle;

import

android.os.Handler;

import

android.os.Message;

import

android.widget.Toast;

/**

*

功能：使用ViewPager實現初次進入應用時的引導頁

*

*

(1)判斷是否是首次加載應用--采取讀取SharedPreferences的方法

*

(2)是，則進入引導activity；否，則進入MainActivity

*

(3)5s后執行(2)操作

*

*

@author

yayun

*

*/

public

class

SplashActivity

extends

Activity

{

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

//setContentView(R.layout.activity_splash);

boolean

mFirst

=

isFirstEnter(SplashActivity.this,SplashActivity.this.getClass().getName());

Toast.makeText(this,

mFirst+,

Toast.LENGTH_SHORT).show();

if(mFirst)

mHandler.sendEmptyMessageDelayed(SWITCH_GUIDACTIVITY,100);

else

mHandler.sendEmptyMessageDelayed(SWITCH_MAINACTIVITY,100);

SharedPreferences

sharedPreferences=

this.getSharedPreferences(my_pref,

MODE_PRIVATE);

sharedPreferences.edit().putString(guide_activity,

false).commit();

}

//****************************************************************

//

判斷應用是否初次加載，讀取SharedPreferences中的guide_activity字段

//****************************************************************

private

static

final

String

SHAREDPREFERENCES_NAME

=

my_pref;

private

static

final

String

KEY_GUIDE_ACTIVITY

=

guide_activity;

private

boolean

isFirstEnter(Context

context,String

className){

if(context==null

||

className==null||.equalsIgnoreCase(className))return

false;

String

mResultStr

=

context.getSharedPreferences(SHAREDPREFERENCES_NAME,

Context.MODE_WORLD_READABLE)

.getString(KEY_GUIDE_ACTIVITY,

);//取得所有類名

如

com.my.MainActivity

if(mResultStr.equalsIgnoreCase(false))

return

false;

else

return

true;

}

//*************************************************

//

Handler:跳轉至不同頁面

//*************************************************

private

final

static

int

SWITCH_MAINACTIVITY

=

1000;

private

final

static

int

SWITCH_GUIDACTIVITY

=

1001;

public

Handler

mHandler

=

new

Handler(){

public

void

handleMessage(Message

msg)

{

switch(msg.what){

case

SWITCH_MAINACTIVITY:

Intent

mIntent

=

new

Intent();

mIntent.setClass(SplashActivity.this,

Welcome.class);

SplashActivity.this.startActivity(mIntent);

SplashActivity.this.finish();

break;

case

SWITCH_GUIDACTIVITY:

mIntent

=

new

Intent();

mIntent.setClass(SplashActivity.this,

GuideActivity.class);

SplashActivity.this.startActivity(mIntent);

SplashActivity.this.finish();

break;

}

super.handleMessage(msg);

}

};

}原理很簡單，進入的時候進行判斷有無存值，若無存值則表示第一次進入，這時跳入應用引導頁，否則，跳入主頁面。

2.ViewPager實現翻頁效果：package

com.yayun.guide;

import

java.util.ArrayList;

import

java.util.List;

import

android.app.Activity;

import

android.content.Intent;

import

android.os.Bundle;

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.View.OnClickListener;

import

android.view.ViewGroup;

import

android.view.Window;

import

android.widget.Button;

import

android.widget.LinearLayout;

public

class

GuideActivity

extends

Activity

implements

OnClickListener

{

private

ViewPager

mViewPager;

private

PagerAdapter

mAdapter;

private

List<view>

mViews

=

new

ArrayList<view>();

//

TAB

private

LinearLayout

mTabWeixin;

private

LinearLayout

mTabFrd;

private

LinearLayout

mTabAddress;

private

LinearLayout

mTabSetting;

private

Button

mEnterButton;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.activity_main);

initView();

initEvents();

}

private

void

initEvents()

{

mViewPager.setOnPageChangeListener(new

OnPageChangeListener()

{

@Override

public

void

onPageSelected(int

arg0)

{

}

@Override

public

void

onPageScrolled(int

arg0,

float

arg1,

int

arg2)

{

}

@Override

public

void

onPageScrollStateChanged(int

arg0)

{

}

});

}

private

void

initView()

{

mViewPager

=

(ViewPager)

findViewById(R.id.id_viewpager);

LayoutInflater

mInflater

=

LayoutInflater.from(this);

View

tab01

=

mInflater.inflate(R.layout.tab01,

null);

View

tab02

=

mInflater.inflate(R.layout.tab02,

null);

View

tab03

=

mInflater.inflate(R.layout.tab03,

null);

View

tab04

=

mInflater.inflate(R.layout.tab04,

null);

mViews.add(tab01);

mViews.add(tab02);

mViews.add(tab03);

mViews.add(tab04);

mEnterButton=(Button)tab04.findViewById(R.id.imgbtn_enter);

mEnterButton.setOnClickListener(new

OnClickListener()

{

@Override

public

void

onClick(View

v)

{

Intent

intent=new

Intent(GuideActivity.this,Welcome.class);

startActivity(intent);

}

});

mAdapter

=

new

PagerAdapter()

{

@Override

public

void

destroyItem(ViewGroup

container,

int

position,

Object

object)

{

container.removeView(mViews.get(position));

}

@Override

public

Object

instantiateItem(ViewGroup

container,

int

position)

{

View

view

=

mViews.get(position);

container.addView(view);

return

view;

}

@Override

public

boolean

isViewFromObject(View

arg0,