【移動(dòng)應(yīng)用開發(fā)技術(shù)】Android中怎么實(shí)現(xiàn)滑動(dòng)分頁(yè)功能_第1頁(yè)
【移動(dòng)應(yīng)用開發(fā)技術(shù)】Android中怎么實(shí)現(xiàn)滑動(dòng)分頁(yè)功能_第2頁(yè)
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【移動(dòng)應(yīng)用開發(fā)技術(shù)】Android中怎么實(shí)現(xiàn)滑動(dòng)分頁(yè)功能

這篇文章給大家介紹Android中怎么實(shí)現(xiàn)滑動(dòng)分頁(yè)功能，內(nèi)容非常詳細(xì)，感興趣的小伙伴們可以參考借鑒，希望對(duì)大家能有所幫助。Java代碼：package

cn.anycall.ju;

import

java.util.ArrayList;

import

java.util.HashMap;

import

java.util.List;

import

java.util.Map;

import

android.app.Activity;

import

android.content.ActivityNotFoundException;

import

android.content.Context;

import

android.content.Intent;

import

android.content.pm.ResolveInfo;

import

android.os.Bundle;

import

android.os.Handler;

import

android.os.Looper;

import

android.os.Message;

import

android.view.KeyEvent;

import

android.view.View;

import

android.view.Window;

import

android.widget.AdapterView;

import

android.widget.AdapterView.OnItemClickListener;

import

android.widget.GridView;

import

android.widget.Toast;

import

cn.anycall.ju.ScrollLayout.OnScreenChangeListenerDataLoad;

/**

*

GridView分頁(yè)顯示安裝的應(yīng)用程序

*/

public

class

AllAppList

extends

Activity

{

private

ScrollLayout

mScrollLayout;

private

static

final

float

APP_PAGE_SIZE

=

4.0f;

private

Context

mContext;

private

PageControlView

pageControl;

public

MyHandler

myHandler;

public

int

n=0;

private

DataLoading

dataLoad;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

//

TODO

Auto-generated

method

stub

super.onCreate(savedInstanceState);

this.requestWindowFeature(Window.FEATURE_NO_TITLE);

mContext

=

this;

setContentView(R.layout.main);

dataLoad

=

new

DataLoading();

mScrollLayout

=

(ScrollLayout)findViewById(R.id.ScrollLayoutTest);

myHandler

=

new

MyHandler(this,1);

//起一個(gè)線程更新數(shù)據(jù)

MyThread

m

=

new

MyThread();

new

Thread(m).start();

}

/**

*

gridView

的onItemLick響應(yīng)事件

*/

public

OnItemClickListener

listener

=

new

OnItemClickListener()

{

public

void

onItemClick(AdapterView<?>

parent,

View

view,

int

position,

long

id)

{

//

TODO

Auto-generated

method

stub

System.out.println("position="+position);

}

};

@Override

protected

void

onDestroy()

{

//

TODO

Auto-generated

method

stub

android.os.Process.killProcess(android.os.Process.myPid());

super.onDestroy();

}

@Override

public

boolean

onKeyDown(int

keyCode,

KeyEvent

event)

{

//

TODO

Auto-generated

method

stub

if

(keyCode

==

KeyEvent.KEYCODE_BACK)

{

finish();

return

true;

}

return

super.onKeyDown(keyCode,

event);

}

//

更新后臺(tái)數(shù)據(jù)

class

MyThread

implements

Runnable

{

public

void

run()

{

try

{

Thread.sleep(1000*3);

}

catch

(InterruptedException

e)

{

//

TODO

Auto-generated

catch

block

e.printStackTrace();

}

String

msglist

=

"1";

Message

msg

=

new

Message();

Bundle

b

=

new

Bundle();//

存放數(shù)據(jù)

b.putString("rmsg",

msglist);

msg.setData(b);

AllAppList.this.myHandler.sendMessage(msg);

//

向Handler發(fā)送消息,更新UI

}

}

class

MyHandler

extends

Handler

{

private

AllAppList

mContext;

public

MyHandler(Context

conn,int

a)

{

mContext

=

(AllAppList)conn;

}

public

MyHandler(Looper

L)

{

super(L);

}

//

子類必須重寫此方法,接受數(shù)據(jù)

@Override

public

void

handleMessage(Message

msg)

{

//

TODO

Auto-generated

method

stub

super.handleMessage(msg);

Bundle

b

=

msg.getData();

String

rmsg

=

b.getString("rmsg");

if

("1".equals(rmsg))

{

//

do

nothing

List<Map>

list

=

new

ArrayList<Map>();

for(int

i

=0;i<16;i++){

n++;

Map

map

=

new

HashMap();

map.put("name",

n);

list.add(map);

}

int

pageNo

=

(int)Math.ceil(

list.size()/APP_PAGE_SIZE);

for

(int

i

=

0;

i

<

pageNo;

i++)

{

GridView

appPage

=

new

GridView(mContext);

//

get

the

"i"

page

data

appPage.setAdapter(new

AppAdapter(mContext,

list,

i));

appPage.setNumColumns(2);

appPage.setOnItemClickListener(listener);

mScrollLayout.addView(appPage);

}

//加載分頁(yè)

pageControl

=

(PageControlView)

findViewById(R.id.pageControl);

pageControl.bindScrollViewGroup(mScrollLayout);

//加載分頁(yè)數(shù)據(jù)

dataLoad.bindScrollViewGroup(mScrollLayout);

}

}

}

//分頁(yè)數(shù)據(jù)

class

DataLoading

{

private

int

count;

public

void

bindScrollViewGroup(ScrollLayout

scrollViewGroup)

{

this.count=scrollViewGroup.getChildCount();

scrollViewGroup.setOnScreenChangeListenerDataLoad(new

OnScreenChangeListenerDataLoad()

{

public

void

onScreenChange(int

currentIndex)

{

//

TODO

Auto-generated

method

stub

generatePageControl(currentIndex);

}

});

}

private

void

generatePageControl(int

currentIndex){

//如果到最后一頁(yè)，就加載16條記錄

if(count==currentIndex+1){

MyThread

m

=

new

MyThread();

new

Thread(m).start();

}

}

}

}Java代碼：package

cn.anycall.ju;

import

java.util.ArrayList;

import

java.util.HashMap;

import

java.util.List;

import

java.util.Map;

import

android.app.Activity;

import

android.content.ActivityNotFoundException;

import

android.content.Context;

import

android.content.Intent;

import

android.content.pm.ResolveInfo;

import

android.os.Bundle;

import

android.os.Handler;

import

android.os.Looper;

import

android.os.Message;

import

android.view.KeyEvent;

import

android.view.View;

import

android.view.Window;

import

android.widget.AdapterView;

import

android.widget.AdapterView.OnItemClickListener;

import

android.widget.GridView;

import

android.widget.Toast;

import

cn.anycall.ju.ScrollLayout.OnScreenChangeListenerDataLoad;

/**

*

GridView分頁(yè)顯示安裝的應(yīng)用程序

*/

public

class

AllAppList

extends

Activity

{

private

ScrollLayout

mScrollLayout;

private

static

final

float

APP_PAGE_SIZE

=

4.0f;

private

Context

mContext;

private

PageControlView

pageControl;

public

MyHandler

myHandler;

public

int

n=0;

private

DataLoading

dataLoad;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

//

TODO

Auto-generated

method

stub

super.onCreate(savedInstanceState);

this.requestWindowFeature(Window.FEATURE_NO_TITLE);

mContext

=

this;

setContentView(R.layout.main);

dataLoad

=

new

DataLoading();

mScrollLayout

=

(ScrollLayout)findViewById(R.id.ScrollLayoutTest);

myHandler

=

new

MyHandler(this,1);

//起一個(gè)線程更新數(shù)據(jù)

MyThread

m

=

new

MyThread();

new

Thread(m).start();

}

/**

*

gridView

的onItemLick響應(yīng)事件

*/

public

OnItemClickListener

listener

=

new

OnItemClickListener()

{

public

void

onItemClick(AdapterView<?>

parent,

View

view,

int

position,

long

id)

{

//

TODO

Auto-generated

method

stub

System.out.println("position="+position);

}

};

@Override

protected

void

onDestroy()

{

//

TODO

Auto-generated

method

stub

android.os.Process.killProcess(android.os.Process.myPid());

super.onDestroy();

}

@Override

public

boolean

onKeyDown(int

keyCode,

KeyEvent

event)

{

//

TODO

Auto-generated

method

stub

if

(keyCode

==

KeyEvent.KEYCODE_BACK)

{

finish();

return

true;

}

return

super.onKeyDown(keyCode,

event);

}

//

更新后臺(tái)數(shù)據(jù)

class

MyThread

implements

Runnable

{

public

void

run()

{

try

{

Thread.sleep(1000*3);

}

catch

(InterruptedException

e)

{

//

TODO

Auto-generated

catch

block

e.printStackTrace();

}

String

msglist

=

"1";

Message

msg

=

new

Message();

Bundle

b

=

new

Bundle();//

存放數(shù)據(jù)

b.putString("rmsg",

msglist);

msg.setData(b);

AllAppList.this.myHandler.sendMessage(msg);

//

向Handler發(fā)送消息,更新UI

}

}

class

MyHandler

extends

Handler

{

private

AllAppList

mContext;

public

MyHandler(Context

conn,int

a)

{

mContext

=

(AllAppList)conn;

}

public

MyHandler(Looper

L)

{

super(L);

}

//

子類必須重寫此方法,接受數(shù)據(jù)

@Override

public

void

handleMessage(Message

msg)

{

//

TODO

Auto-generated

method

stub

super.handleMessage(msg);

Bundle

b

=

msg.getData();

String

rmsg

=

b.getString("rmsg");

if

("1".equals(rmsg))

{

//

do

nothing

List<Map>

list

=

new

ArrayList<Map>();

for(int

i

=0;i<16;i++){

n++;

Map

map

=

new

HashMap();

map.put("name",

n);

list.add(map);

}

int

pageNo

=

(int)Math.ceil(

list.size()/APP_PAGE_SIZE);

for

(int

i

=

0;

i

<

pageNo;

i++)

{

GridView

appPage

=

new

GridView(mContext);

//

get

the

"i"

page

data

appPage.setAdapter(new

AppAdapter(mContext,

list,

i));

appPage.setNumColumns(2);

appPage.setOnItemClickListener(listener);

mScrollLayout.addView(appPage);

}

//加載分頁(yè)

pageControl

=

(PageControlView)

findViewById(R.id.pageControl);

pageControl.bindScrollViewGroup(mScrollLayout);

//加載分頁(yè)數(shù)據(jù)

dataLoad.bindScrollViewGroup(mScrollLayout);

}

}

}

//分頁(yè)數(shù)據(jù)

class

DataLoading

{

private

int

count;

public

void

bindScrollViewGroup(ScrollLayout

scrollViewGroup)

{

this.count=scrollViewGroup.getChildCount();

scrollViewGroup.setOnScreenChangeListenerDataLoad(new

OnScreenChangeListenerDataLoad()

{

public

void

onScreenChange(int

currentIndex)

{

//

TODO

Auto-generated

method

stub

generatePageControl(currentIndex);

}

});

}

private

void

generatePageControl(int

currentIndex){

//如果到最后一頁(yè)，就加載16條記錄

if(count==currentIndex+1){

MyThread

m

=

new

MyThread();

new

Thread(m).start();

}

}

}

}Java代碼：package

cn.anycall.ju;

import

java.util.ArrayList;

import

java.util.List;

import

java.util.Map;

import

android.content.Context;

import

android.content.pm.PackageManager;

import

android.content.pm.ResolveInfo;

import

android.view.LayoutInflater;

import

android.view.View;

import

android.view.ViewGroup;

import

android.widget.BaseAdapter;

import

android.widget.ImageView;

import

android.widget.TextView;

import

cn.anycall.ju.R;

public

class

AppAdapter

extends

BaseAdapter

{

private

List<Map>

mList;

private

Context

mContext;

public

static

final

int

APP_PAGE_SIZE

=

4;

private

PackageManager

pm;

public

AppAdapter(Context

context,

List<Map>

list,

int

page)

{

mContext

=

context;

pm

=

context.getPackageManager();

mList

=

new

ArrayList<Map>();

int

i

=

page

*

APP_PAGE_SIZE;

int

iEnd

=

i+APP_PAGE_SIZE;

while

((i<list.size())

&&

(i<iEnd))

{

mList.add(list.get(i));

i++;

}

}

public

int

getCount()

{

//

TODO

Auto-generated

method

stub

return

mList.size();

}

public

Object

getItem(int

position)

{

//

TODO

Auto-generated

method

stub

return

mList.get(position);

}

public

long

getItemId(int

position)

{

//

TODO

Auto-generated

method

stub

return

position;

}

public

View

getView(int

position,

View

convertView,

ViewGroup

parent)

{

//

TODO

Auto-generated

method

stub

Map

appInfo

=

mList.get(position);

AppItem

appItem;

if

(convertView

==

null)

{

View

v

=

LayoutInflater.from(mContext).inflate(R.layout.app_item,

null);

appItem

=

new

AppItem();

appItem.mAppIcon

=

(ImageView)v.findViewById(R.id.imgdetail);

appItem.mAppName

=

(TextView)v.findViewById(R.id.tuaninfo);

v.setTag(appItem);

convertView

=

v;

}

else

{

appItem

=

(AppItem)convertView.getTag();

}

//

set

the

icon

appItem.mAppIcon.setImageResource(R.drawable.icon);

//

set

the

app

name

appItem.mAppName.setText(appInfo.get("name").toString());

return

convertView;

}

/**

*

每個(gè)應(yīng)用顯示的內(nèi)容，包括圖標(biāo)和名稱

*

@author

Yao.GUET

*

*/

class

AppItem

{

ImageView

mAppIcon;

TextView

mAppName;

}

}Java代碼：package

cn.anycall.ju;

import

java.util.ArrayList;

import

java.util.List;

import

java.util.Map;

import

android.content.Context;

import

android.content.pm.PackageManager;

import

android.content.pm.ResolveInfo;

import

android.view.LayoutInflater;

import

android.view.View;

import

android.view.ViewGroup;

import

android.widget.BaseAdapter;

import

android.widget.ImageView;

import

android.widget.TextView;

import

cn.anycall.ju.R;

public

class

AppAdapter

extends

BaseAdapter

{

private

List<Map>

mList;

private

Context

mContext;

public

static

final

int

APP_PAGE_SIZE

=

4;

private

PackageManager

pm;

public

AppAdapter(Context

context,

List<Map>

list,

int

page)

{

mContext

=

context;

pm

=

context.getPackageManager();

mList

=

new

ArrayList<Map>();

int

i

=

page

*

APP_PAGE_SIZE;

int

iEnd

=

i+APP_PAGE_SIZE;

while

((i<list.size())

&&

(i<iEnd))

{

mList.add(list.get(i));

i++;

}

}

public

int

getCount()

{

//

TODO

Auto-generated

method

stub

return

mList.size();

}

public

Object

getItem(int

position)

{

//

TODO

Auto-generated

method

stub

return

mList.get(position);

}

public

long

getItemId(int

position)

{

//

TODO

Auto-generated

method

stub

return

position;

}

public

View

getView(int

position,

View

convertView,

ViewGroup

parent)

{

//

TODO

Auto-generated

method

stub

Map

appInfo

=

mList.get(position);

AppItem

appItem;

if

(convertView

==

null)

{

View

v

=

LayoutInflater.from(mContext).inflate(R.layout.app_item,

null);

appItem

=

new

AppItem();

appItem.mAppIcon

=

(ImageView)v.findViewById(R.id.imgdetail);

appItem.mAppName

=

(TextView)v.findViewById(R.id.tuaninfo);

v.setTag(appItem);

convertView

=

v;

}

else

{

appItem

=

(AppItem)convertView.getTag();

}

//

set

the

icon

appItem.mAppIcon.setImageResource(R.drawable.icon);

//

set

the

app

name

appItem.mAppName.setText(appInfo.get("name").toString());

return

convertView;

}

/**

*

每個(gè)應(yīng)用顯示的內(nèi)容，包括圖標(biāo)和名稱

*

@author

Yao.GUET

*

*/

class

AppItem

{

ImageView

mAppIcon;

TextView

mAppName;

}

}Java代碼：package

cn.anycall.ju;

import

android.content.Context;

import

android.util.AttributeSet;

import

android.widget.ImageView;

import

android.widget.LinearLayout;

import

cn.anycall.ju.R;

import

cn.anycall.ju.ScrollLayout.OnScreenChangeListener;

public

class

PageControlView

extends

LinearLayout

{

private

Context

context;

private

int

count;

public

void

bindScrollViewGroup(ScrollLayout

scrollViewGroup)

{

this.count=scrollViewGroup.getChildCount();

System.out.println("count="+count);

generatePageControl(scrollViewGroup.getCurrentScreenIndex());

scrollViewGroup.setOnScreenChangeListener(new

OnScreenChangeListener()

{

public

void

onScreenChange(int

currentIndex)

{

//

TODO

Auto-generated

method

stub

generatePageControl(currentIndex);

}

});

}

public

PageControlView(Context

context)

{

super(context);

this.init(context);

}

public

PageControlView(Context

context,

AttributeSet

attrs)

{

super(context,

attrs);

this.init(context);

}

private

void

init(Context

context)

{

this.context=context;

}

private

void

generatePageControl(int

currentIndex)

{

this.removeAllViews();

int

pageNum

=

6;

//

顯示多少個(gè)

int

pageNo

=

currentIndex+1;

//第幾頁(yè)

int

pageSum

=

this.count;

//總共多少頁(yè)

if(pageSum>1){

int

currentNum

=

(pageNo

%

pageNum

==

0

?

(pageNo

/

pageNum)

-

1

:

(int)

(pageNo

/

pageNum))

*

pageNum;

if

(currentNum

<

0)

currentNum

=

0;

if

(pageNo

>

pageNum){

ImageView

imageView

=

new

ImageView(context);

imageView.setImageResource(R.drawable.zuo);

this.addView(imageView);

}

for

(int

i

=

0;

i

<

pageNum;

i++)

{

if

((currentNum

+

i

+

1)

>

pageSum

||

pageSum

<

2)

break;

ImageView

imageView

=

new

ImageView(context);

if(currentNum

+

i

+

1

==

pageNo){

imageView.setImageResource(R.drawable.page_indicator_focused);

}else{

imageView.setImageResource(R.drawable.page_indicator);

}

this.addView(imageView);

}

if

(pageSum

>

(currentNum

+

pageNum))

{

ImageView

imageView

=

new

ImageView(context);

imageView.setImageResource(R.drawable.you);

this.addView(imageView);

}

}

}

}Java代碼：package

cn.anycall.ju;

import

android.content.Context;

import

android.util.AttributeSet;

import

android.widget.ImageView;

import

android.widget.LinearLayout;

import

cn.anycall.ju.R;

import

cn.anycall.ju.ScrollLayout.OnScreenChangeListener;

public

class

PageControlView

extends

LinearLayout

{

private

Context

context;

private

int

count;

public

void

bindScrollViewGroup(ScrollLayout

scrollViewGroup)

{

this.count=scrollViewGroup.getChildCount();

System.out.println("count="+count);

generatePageControl(scrollViewGroup.getCurrentScreenIndex());

scrollViewGroup.setOnScreenChangeListener(new

OnScreenChangeListener()

{

public

void

onScreenChange(int

currentIndex)

{

//

TODO

Auto-generated

method

stub

generatePageControl(currentIndex);

}

});

}

public

PageControlView(Context

context)

{

super(context);

this.init(context);

}

public

PageControlView(Context

context,

AttributeSet

attrs)

{

super(context,

attrs);

this.init(context);

}

private

void

init(Context

context)

{

this.context=context;

}

private

void

generatePageControl(int

currentIndex)

{

this.removeAllViews();

int

pageNum

=

6;

//

顯示多少個(gè)

int

pageNo

=

currentIndex+1;

//第幾頁(yè)

int

pageSum

=

this.count;

//總共多少頁(yè)

if(pageSum>1){

int

currentNum

=

(pageNo

%

pageNum

==

0

?

(pageNo

/

pageNum)

-

1

:

(int)

(pageNo

/

pageNum))

*

pageNum;

if

(currentNum

<

0)

currentNum

=

0;

if

(pageNo

>

pageNum){

ImageView

imageView

=

new

ImageView(context);

imageView.setImageResource(R.drawable.zuo);

this.addView(imageView);

}

for

(int

i

=

0;

i

<

pageNum;

i++)

{

if

((currentNum

+

i

+

1)

>

pageSum

||

pageSum

<

2)

break;

ImageView

imageView

=

new

ImageView(context);

if(currentNum

+

i

+

1

==

pageNo){

imageView.setImageResource(R.drawable.page_indicator_focused);

}else{

imageView.setImageResource(R.drawable.page_indicator);

}

this.addView(imageView);

}

if

(pageSum

>

(currentNum

+

pageNum))

{

ImageView

imageView

=

new

ImageView(context);

imageView.setImageResource(R.drawable.you);

this.addView(imageView);

}

}

}

}Java代碼：package

cn.anycall.ju;

import

android.content.Context;

import

android.graphics.Canvas;

import

android.util.AttributeSet;

import

android.util.Log;

import

android.view.MotionEvent;

import

android.view.VelocityTracker;

import

android.view.View;

import

android.view.ViewConfiguration;

import

android.view.ViewGroup;

import

android.widget.Scroller;

/**

*

仿Launcher中的WorkSapce，可以左右滑動(dòng)切換屏幕的類

*

*/

public

class

ScrollLayout

extends

ViewGroup

{

private

static

final

String

TAG

=

"ScrollLayout";

private

Scroller

mScroller;

private

VelocityTracker

mVelocityTracker;

private

int

mCurScreen;

private

int

mDefaultScreen

=

0;

private

static

final

int

TOUCH_STATE_REST

=

0;

private

static

final

int

TOUCH_STATE_SCROLLING

=

1;

private

static

final

int

SNAP_VELOCITY

=

600;

private

int

mTouchState

=

TOUCH_STATE_REST;

private

int

mTouchSlop;

private

float

mLastMotionX;

private

float

mLastMotionY;

private

int

currentScreenIndex

=

0;

public

int

getCurrentScreenIndex()

{

return

currentScreenIndex;

}

public

void

setCurrentScreenIndex(int

currentScreenIndex)

{

this.currentScreenIndex

=

currentScreenIndex;

}

public

ScrollLayout(Context

context,

AttributeSet

attrs)

{

this(context,

attrs,

0);

//

TODO

Auto-generated

constructor

stub

}

public

ScrollLayout(Context

context,

AttributeSet

attrs,

int

defStyle)

{

super(context,

attrs,

defStyle);

//

TODO

Auto-generated

constructor

stub

mScroller

=

new

Scroller(context);

mCurScreen

=

mDefaultScreen;

mTouchSlop

=

ViewConfiguration.get(getContext()).getScaledTouchSlop();

}

@Override

protected

void

onLayout(boolean

changed,

int

l,

int

t,

int

r,

int

b)

{

//

TODO

Auto-generated

method

stub

int

childLeft

=

0;

final

int

childCount

=

getChildCount();

System.out.println("childCount="

+

childCount);

for

(int

i

=

0;

i

<

childCount;

i++)

{

final

View

childView

=

getChildAt(i);

if

(childView.getVisibility()

!=

View.GONE)

{

final

int

childWidth

=

childView.getMeasuredWidth();

childView.layout(childLeft,

0,

childLeft

+

childWidth,

childView.getMeasuredHeight());

childLeft

+=

childWidth;

}

}

}

@Override

protected

void

onMeasure(int

widthMeasureSpec,

int

heightMeasureSpec)

{

Log.e(TAG,

"onMeasure");

super.onMeasure(widthMeasureSpec,

heightMeasureSpec);

final

int

width

=

MeasureSpec.getSize(widthMeasureSpec);

final

int

widthMode

=

MeasureSpec.getMode(widthMeasureSpec);

if

(widthMode

!=

MeasureSpec.EXACTLY)

{

throw

new

IllegalStateException(

"ScrollLayout

only

canmCurScreen

run

at

EXACTLY

mode!");

}

final

int

heightMode

=

MeasureSpec.getMode(heightMeasureSpec);

if

(heightMode

!=

MeasureSpec.EXACTLY)

{

throw

new

IllegalStateException(

"ScrollLayout

only

can

run

at

EXACTLY

mode!");

}

//

The

children

are

given

the

same

width

and

height

as

the

scrollLayout

final

int

count

=

getChildCount();

for

(int

i

=

0;

i

<

count;

i++)

{

getChildAt(i).measure(widthMeasureSpec,

heightMeasureSpec);

}

System.out.println("moving

to

screen

"

+

mCurScreen);

scrollTo(mCurScreen

*

width,

0);

}

/**

*

According

to

the

position

of

current

layout

scroll

to

the

destination

*

page.

*/

public

void

snapToDestination()

{

final

int

screenWidth

=

getWidth();

final

int

destScreen

=

(getScrollX()

+

screenWidth

/

2)

/

screenWidth;

snapToScreen(destScreen);

}

public

void

snapToScreen(int

whichScreen)

{

//

get

the

valid

layout

page

whichScreen

=

Math.max(0,

Math.min(whichScreen,

getChildCount()

-

1));

if

(getScrollX()

!=

(whichScreen

*

getWidth()))

{

final

int

delta

=

whichScreen

*

getWidth()

-

getScrollX();

mScroller.startScroll(getScrollX(),

0,

delta,

0,

Math.abs(delta)

*

2);

mCurScreen

=

whichScreen;

invalidate();

//

Redraw

the

layout

}

}

public

void

setToScreen(int

whichScreen)

{

whichScreen

=

Math.max(0,

Math.min(whichScreen,

getChildCount()

-

1));

mCurScreen

=

whichScreen;

scrollTo(whichScreen

*

getWidth(),

0);

}

public

int

getCurScreen()

{

return

mCurScreen;

}

@Override

public

void

computeScroll()

{

//

TODO

Auto-generated

method

stub

if

(mSputeScrollOffset())

{

scrollTo(mScroller.getCurrX(),

mScroller.getCurrY());

postInvalidate();

}

}

@Override

public

boolean

onTouchEvent(MotionEvent

event)

{

//

TODO

Auto-generated

method

stub

if

(mVelocityTracker

==

null)

{

mVelocityTracker

=

VelocityTracker.obtain();

}

mVelocityTracker.addMovement(event);

final

int

action

=

event.getAction();

final

float

x

=

event.getX();

final

float

y

=

event.getY();

switch

(action)

{

case

MotionEvent.ACTION_DOWN:

Log.e(TAG,

"event

down!");

if

(!mScroller.isFinished())

{

mScroller.abortAnimation();

}

mLastMotionX

=

x;

break;

case

MotionEvent.ACTION_MOVE:

int

deltaX

=

(int)

(mLastMotionX

-

x);

mLastMotionX

=

x;

scrollBy(deltaX,

0);

break;

case

MotionEvent.ACTION_UP:

Log.e(TAG,

"event

:

up");

//

if

(mTouchState

==

TOUCH_STATE_SCROLLING)

{

final

VelocityTracker

velocityTracker

=

mVelocityTracker;

velocityTputeCurrentVelocity(1000);

int

velocityX

=

(int)

velocityTracker.getXVelocity();

Log.e(TAG,

"velocityX:"

+

velocityX);

if

(velocityX

>

SNAP_VELOCITY

&&

mCurScreen

>

0)

{

//

Fling

enough

to

move

left

Log.e(TAG,

"snap

left");

onScreenChangeListener.onScreenChange(mCurScreen

-

1);

System.out.println("mCurScreen="

+

(mCurScreen

-

1));

snapToScreen(mCurScreen

-

1);

}

else

if

(velocityX

<

-SNAP_VELOCITY

&&

mCurScreen

<

getChildCount()

-

1)

{

//

Fling

enough

to

move

right

Log.e(TAG,

"snap

right");

onScreenChangeListener.onScreenChange(mCurScreen

+

1);

//只往右移動(dòng)才加載數(shù)據(jù)

onScreenChangeListenerDataLoad.onScreenChange(mCurScreen+1);

snapToScreen(mCurScreen

+

1);

}

else

{

snapToDestination();

}

if

(mVelocityTracker

!=

null)

{

mVelocityTracker.recycle();

mVelocityTracker

=

null;

}

//

}

mTouchState

=

TOUCH_STATE_REST;

break;

case

MotionEvent.ACTION_CANCEL:

mTouchState

=

TOUCH_STATE_REST;

break;

}

return

true;

}

@Override

public

boolean

onInterceptTouchEvent(MotionEvent

ev)

{

//

TODO

Auto-generated

method

stub

Log.e(TAG,

"onInterceptTouchEvent-slop:"

+

mTouchSlop);

final

int

action

=

ev.getAction();

if

((action

==

MotionEvent.ACTION_MOVE)

&&

(mTouchState

!=

TOUCH_STATE_REST))

{

return

true;

}

final

float

x

=

ev.getX();

final

float

y

=

ev.getY();

switch

(action)

{

case

MotionEvent.ACTION_MOVE:

final

int

xDiff

=

(int)

Math.abs(mLastMotionX

-

x);

if

(xDiff

>

mTouchSlop)

{

mTouchState

=

TOUCH_STATE_SCROLLING;

}

break;

case

MotionEvent.ACTION_DOWN:

mLastMotionX

=

x;

mLastMotionY

=

y;

mTouchState

=

mScroller.isFinished()

?

TOUCH_STATE_REST

:

TOUCH_STATE_SCROLLING;

break;

case

MotionEvent.ACTION_CANCEL:

case

MotionEvent.ACTION_UP:

mTouchState

=

TOUCH_STATE_REST;

break;

}

return

mTouchState

!=

TOUCH_STATE_REST;

}

//分頁(yè)監(jiān)聽

public

interface

OnScreenChangeListener

{

void

onScreenChange(int

currentIndex);

}

private

OnScreenChangeListener

onScreenChangeListener;

public

void

setOnScreenChangeListener(

OnScreenChangeListener

onScreenChangeListener)

{

this.onScreenChangeListener

=

onScreenChangeListener;

}

//動(dòng)態(tài)數(shù)據(jù)監(jiān)聽

public

interface

OnScreenChangeListenerDataLoad

{

void

onScreenChange(int

currentIndex);

}

private

OnScreenChangeListenerDataLoad

onScreenChangeListenerDataLoad;

public

void

setOnScreenChangeListenerDataLoad(OnScreenChangeListenerDataLoad

onScreenChangeListenerDataLoad)

{

this.onScreenChangeListenerDataLoad

=

onScreenChangeListenerDataLoad;

}

}Java代碼package

cn.anycall.ju;

import

android.content.Context;

import

android.graphics.Canvas;

import

android.util.AttributeSet;

import

android.util.Log;

import

android.view.MotionEvent;

import

android.view.VelocityTracker;

import

android.view.View;

import

android.view.ViewConfiguration;

import

android.view.ViewGroup;

import

android.widget.Scroller;

/**

*

仿Launcher中的WorkSapce，可以左右滑動(dòng)切換屏幕的類

*

*/

public

class

ScrollLayout

extends

ViewGroup

{

private

static

final

String

TAG

=

"ScrollLayout";

private

Scroller

mScroller;

private

VelocityTracker

mVelocityTracker;

private

int

mCurScreen;

private

int

mDefaultScreen

=

0;

private

static

final

int

TOUCH_STATE_REST

=

0;

private

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