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> 详细
android左右滑动加载分页以及动态加载数据
时间:
2014-02-10 18:55:53
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android UI 往右滑动,滑动到最后一页就自动加载数据并显示
如图:
Java代码
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分页显示安装的应用程序
*/
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
);
//起一个线程更新数据
MyThread m =
new
MyThread();
new
Thread(m).start();
}
/**
* gridView 的onItemLick响应事件
*/
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);
}
// 更新后台数据
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();
// 存放数据
b.putString(
"rmsg"
, msglist);
msg.setData(b);
AllAppList.
this
.myHandler.sendMessage(msg);
// 向Handler发送消息,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);
}
// 子类必须重写此方法,接受数据
@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);
}
//加载分页
pageControl = (PageControlView) findViewById(R.id.pageControl);
pageControl.bindScrollViewGroup(mScrollLayout);
//加载分页数据
dataLoad.bindScrollViewGroup(mScrollLayout);
}
}
}
//分页数据
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){
//如果到最后一页,就加载16条记录
if
(count==currentIndex+
1
){
MyThread m =
new
MyThread();
new
Thread(m).start();
}
}
}
}
[java]
view plain
copy
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分页显示安装的应用程序
*/
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
);
//起一个线程更新数据
MyThread m =
new
MyThread();
new
Thread(m).start();
}
/**
* gridView 的onItemLick响应事件
*/
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);
}
// 更新后台数据
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();
// 存放数据
b.putString(
"rmsg"
, msglist);
msg.setData(b);
AllAppList.
this
.myHandler.sendMessage(msg);
// 向Handler发送消息,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);
}
// 子类必须重写此方法,接受数据
@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);
}
//加载分页
pageControl = (PageControlView) findViewById(R.id.pageControl);
pageControl.bindScrollViewGroup(mScrollLayout);
//加载分页数据
dataLoad.bindScrollViewGroup(mScrollLayout);
}
}
}
//分页数据
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){
//如果到最后一页,就加载16条记录
if
(count==currentIndex+
1
){
MyThread m =
new
MyThread();
new
Thread(m).start();
}
}
}
}
Java代码
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;
}
/**
* 每个应用显示的内容,包括图标和名称
* @author Yao.GUET
*
*/
class
AppItem {
ImageView mAppIcon;
TextView mAppName;
}
}
[java]
view plain
copy
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;
}
/**
* 每个应用显示的内容,包括图标和名称
* @author Yao.GUET
*
*/
class
AppItem {
ImageView mAppIcon;
TextView mAppName;
}
}
Java代码
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
;
// 显示多少个
int
pageNo = currentIndex+
1
;
//第几页
int
pageSum =
this
.count;
//总共多少页
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]
view plain
copy
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
;
// 显示多少个
int
pageNo = currentIndex+
1
;
//第几页
int
pageSum =
this
.count;
//总共多少页
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代码
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,可以左右滑动切换屏幕的类
*
*/
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
(mScroller.computeScrollOffset()) {
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;
velocityTracker.computeCurrentVelocity(
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
);
//只往右移动才加载数据
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;
}
//分页监听
public
interface
OnScreenChangeListener {
void
onScreenChange(
int
currentIndex);
}
private
OnScreenChangeListener onScreenChangeListener;
public
void
setOnScreenChangeListener(
OnScreenChangeListener onScreenChangeListener) {
this
.onScreenChangeListener = onScreenChangeListener;
}
//动态数据监听
public
interface
OnScreenChangeListenerDataLoad {
void
onScreenChange(
int
currentIndex);
}
private
OnScreenChangeListenerDataLoad onScreenChangeListenerDataLoad;
public
void
setOnScreenChangeListenerDataLoad(OnScreenChangeListenerDataLoad onScreenChangeListenerDataLoad) {
this
.onScreenChangeListenerDataLoad = onScreenChangeListenerDataLoad;
}
}
[java]
view plain
copy
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,可以左右滑动切换屏幕的类
*
*/
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
(mScroller.computeScrollOffset()) {
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;
velocityTracker.computeCurrentVelocity(
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
);
//只往右移动才加载数据
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;
}
//分页监听
public
interface
OnScreenChangeListener {
void
onScreenChange(
int
currentIndex);
}
private
OnScreenChangeListener onScreenChangeListener;
public
void
setOnScreenChangeListener(
OnScreenChangeListener onScreenChangeListener) {
this
.onScreenChangeListener = onScreenChangeListener;
}
//动态数据监听
public
interface
OnScreenChangeListenerDataLoad {
void
onScreenChange(
int
currentIndex);
}
private
OnScreenChangeListenerDataLoad onScreenChangeListenerDataLoad;
public
void
setOnScreenChangeListenerDataLoad(OnScreenChangeListenerDataLoad onScreenChangeListenerDataLoad) {
this
.onScreenChangeListenerDataLoad = onScreenChangeListenerDataLoad;
}
}
main.xml
Xml代码
<?
xml
version
=
"1.0"
encoding
=
"utf-8"
?>
<
LinearLayout
xmlns:android
=
"http://schemas.android.com/apk/res/android"
android:orientation
=
"vertical"
android:layout_width
=
"fill_parent"
android:layout_height
=
"fill_parent"
>
<
TextView
android:layout_width
=
"fill_parent"
android:layout_height
=
"wrap_content"
android:text
=
"仿淘宝聚划算"
/>
<
RelativeLayout
android:id
=
"@+id/myView"
android:layout_width
=
"fill_parent"
android:layout_height
=
"fill_parent"
>
<
cn.anycall.ju.ScrollLayout
xmlns:android
=
"http://schemas.android.com/apk/res/android"
android:id
=
"@+id/ScrollLayoutTest"
android:layout_width
=
"fill_parent"
android:layout_height
=
"fill_parent"
android:background
=
"#000000"
>
</
cn.anycall.ju.ScrollLayout
>
<
cn.anycall.ju.PageControlView
android:id
=
"@+id/pageControl"
android:layout_width
=
"fill_parent"
android:layout_height
=
"40px"
android:background
=
"#8f00000f"
android:layout_alignParentBottom
=
"true"
android:gravity
=
"center"
/>
</
RelativeLayout
>
</
LinearLayout
>
[xml]
view plain
copy
<?
xml
version
=
"1.0"
encoding
=
"utf-8"
?>
<
LinearLayout
xmlns:android
=
"http://schemas.android.com/apk/res/android"
android:orientation
=
"vertical"
android:layout_width
=
"fill_parent"
android:layout_height
=
"fill_parent"
>
<
TextView
android:layout_width
=
"fill_parent"
android:layout_height
=
"wrap_content"
android:text
=
"仿淘宝聚划算"
/>
<
RelativeLayout
android:id
=
"@+id/myView"
android:layout_width
=
"fill_parent"
android:layout_height
=
"fill_parent"
>
<
cn.anycall.ju.ScrollLayout
xmlns:android
=
"http://schemas.android.com/apk/res/android"
android:id
=
"@+id/ScrollLayoutTest"
android:layout_width
=
"fill_parent"
android:layout_height
=
"fill_parent"
android:background
=
"#000000"
>
</
cn.anycall.ju.ScrollLayout
>
<
cn.anycall.ju.PageControlView
android:id
=
"@+id/pageControl"
android:layout_width
=
"fill_parent"
android:layout_height
=
"40px"
android:background
=
"#8f00000f"
android:layout_alignParentBottom
=
"true"
android:gravity
=
"center"
/>
</
RelativeLayout
>
</
LinearLayout
>
app_item.xml
Xml代码
<?
xml
version
=
"1.0"
encoding
=
"utf-8"
?>
<
RelativeLayout
xmlns:android
=
"http://schemas.android.com/apk/res/android"
android:layout_width
=
"fill_parent"
android:layout_height
=
"wrap_content"
>
<
RelativeLayout
android:id
=
"@+id/alllayout"
android:layout_width
=
"wrap_content"
android:layout_height
=
"wrap_content"
>
<
RelativeLayout
android:id
=
"@+id/imglayout"
android:layout_width
=
"160dp"
android:layout_height
=
"160dp"
android:background
=
"@drawable/mer_border"
>
<
ImageView
android:id
=
"@+id/imgdetail"
android:layout_width
=
"145dp"
android:layout_height
=
"145dp"
android:layout_margin
=
"8dp"
/>
<
TextView
android:id
=
"@+id/price"
android:layout_width
=
"180dp"
android:layout_height
=
"wrap_content"
android:text
=
"12345"
android:layout_alignParentBottom
=
"true"
android:background
=
"#C02000"
android:textColor
=
"#FFFFFF"
/>
<
TextView
android:id
=
"@+id/look"
android:layout_width
=
"wrap_content"
android:layout_height
=
"wrap_content"
android:text
=
"去看看"
android:layout_alignParentBottom
=
"true"
android:layout_alignParentRight
=
"true"
android:background
=
"#C02000"
android:textColor
=
"#FFFFFF"
/>
</
RelativeLayout
>
<
TextView
android:id
=
"@+id/tuaninfo"
android:layout_width
=
"fill_parent"
android:layout_height
=
"wrap_content"
android:textSize
=
"16dp"
android:maxLines
=
"2"
android:layout_below
=
"@id/imglayout"
android:ellipsize
=
"end"
android:text
=
"dddddddddd"
/>
"
</
RelativeLayout
>
</
RelativeLayout
>
[xml]
view plain
copy
源码下载:
http://download.csdn.net/detail/javadxz/6910017
<?
xml
version
=
"1.0"
encoding
=
"utf-8"
?>
<
RelativeLayout
xmlns:android
=
"http://schemas.android.com/apk/res/android"
android:layout_width
=
"fill_parent"
android:layout_height
=
"wrap_content"
>
<
RelativeLayout
android:id
=
"@+id/alllayout"
android:layout_width
=
"wrap_content"
android:layout_height
=
"wrap_content"
>
<
RelativeLayout
android:id
=
"@+id/imglayout"
android:layout_width
=
"160dp"
android:layout_height
=
"160dp"
android:background
=
"@drawable/mer_border"
>
<
ImageView
android:id
=
"@+id/imgdetail"
android:layout_width
=
"145dp"
android:layout_height
=
"145dp"
android:layout_margin
=
"8dp"
/>
<
TextView
android:id
=
"@+id/price"
android:layout_width
=
"180dp"
android:layout_height
=
"wrap_content"
android:text
=
"12345"
android:layout_alignParentBottom
=
"true"
android:background
=
"#C02000"
android:textColor
=
"#FFFFFF"
/>
<
TextView
android:id
=
"@+id/look"
android:layout_width
=
"wrap_content"
android:layout_height
=
"wrap_content"
android:text
=
"去看看"
android:layout_alignParentBottom
=
"true"
android:layout_alignParentRight
=
"true"
android:background
=
"#C02000"
android:textColor
=
"#FFFFFF"
/>
</
RelativeLayout
>
<
TextView
android:id
=
"@+id/tuaninfo"
android:layout_width
=
"fill_parent"
android:layout_height
=
"wrap_content"
android:textSize
=
"16dp"
android:maxLines
=
"2"
android:layout_below
=
"@id/imglayout"
android:ellipsize
=
"end"
android:text
=
"dddddddddd"
/>
"
</
RelativeLayout
>
</
RelativeLayout
>
android左右滑动加载分页以及动态加载数据
原文:http://www.cnblogs.com/duanxz/p/3543151.html
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