左右滑屏_Android
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最近比较闲，想起墨迹左右滑屏的效果该如何实现，如是在网上搜索资料，都没看到理想的效果，于是参照别人的例子自己加以修改，最终效果还行。左右滑屏是通过ViewGroup结合手势划屏来实现，代码如下：
ScrollLayoutTest.java
packagecom.scroll.test;
importcom.yao_guet.test.R;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.util.Log;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.view.View.OnFocusChangeListener;
importandroid.widget.Button;
publicclassScrollLayoutTestextendsActivity{
privateScrollLayoutsl;
privateButtonbtn1;
privatePageControlViewpageControlView;
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
sl=(ScrollLayout)findViewById(R.id.ScrollLayoutTest);
pageControlView=(PageControlView)findViewById(R.id.pageControl);
btn1=(Button)findViewById(R.id.btn1);
btn1.setOnClickListener(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
sl.snapToScreen(1);
}
});
sl.setOnFocusChangeListener(newOnFocusChangeListener(){
@Override
publicvoidonFocusChange(Viewv,booleanhasFocus){
inti=v.getVisibility();
Log.v("=sl.i=",i+"=");
}
});
Log.v("=sl.getCurScreen()=",sl.getCurScreen()+"=");
pageControlView.bindScrollLayout(sl);
}
}
ScrollLayout.java
packagecom.scroll.test;
importandroid.content.Context;
importandroid.graphics.Canvas;
importandroid.util.AttributeSet;
importandroid.util.Log;
importandroid.view.MotionEvent;
importandroid.view.VelocityTracker;
importandroid.view.View;
importandroid.view.ViewConfiguration;
importandroid.view.ViewGroup;
importandroid.widget.Scroller;
/**
*仿Launcher中的WorkSapce，可以左右滑动切换屏幕的类
*
*
*
*/
publicclassScrollLayoutextendsViewGroup{
privatestaticfinalStringTAG="ScrollLayout";
privateScrollermScroller;
privateVelocityTrackermVelocityTracker;
privateintmCurScreen;
privateintmDefaultScreen=0;
privatestaticfinalintTOUCH_STATE_REST=0;
privatestaticfinalintTOUCH_STATE_SCROLLING=1;
privatestaticfinalintSNAP_VELOCITY=600;
privateintmTouchState=TOUCH_STATE_REST;
privateintmTouchSlop;
privatefloatmLastMotionX;
privatefloatmLastMotionY;
publicScrollLayout(Contextcontext,AttributeSetattrs){
this(context,attrs,0);
//TODOAuto-generatedconstructorstub
}
publicScrollLayout(Contextcontext,AttributeSetattrs,intdefStyle){
super(context,attrs,defStyle);
//TODOAuto-generatedconstructorstub
mScroller=newScroller(context);
mCurScreen=mDefaultScreen;
mTouchSlop=ViewConfiguration.get(getContext()).getScaledTouchSlop();
}
@Override
protectedvoidonLayout(booleanchanged,intl,intt,intr,intb){
//TODOAuto-generatedmethodstub
if(changed){
intchildLeft=0;
finalintchildCount=getChildCount();
for(inti=0;i
if(childView.getVisibility()!=View.GONE){
finalintchildWidth=childView.getMeasuredWidth();
childView.layout(childLeft,0,
childLeft+childWidth,childView.getMeasuredHeight());
childLeft+=childWidth;
}
}
}
}
@Override
protectedvoidonMeasure(intwidthMeasureSpec,intheightMeasureSpec){
Log.e(TAG,"onMeasure");
super.onMeasure(widthMeasureSpec,heightMeasureSpec);
finalintwidth=MeasureSpec.getSize(widthMeasureSpec);
finalintwidthMode=MeasureSpec.getMode(widthMeasureSpec);
if(widthMode!=MeasureSpec.EXACTLY){
thrownewIllegalStateException("ScrollLayoutonlycanmCurScreenrunatEXACTLYmode!");
}
finalintheightMode=MeasureSpec.getMode(heightMeasureSpec);
if(heightMode!=MeasureSpec.EXACTLY){
thrownewIllegalStateException("ScrollLayoutonlycanrunatEXACTLYmode!");
}
//ThechildrenaregiventhesamewidthandheightasthescrollLayout
finalintcount=getChildCount();
for(inti=0;i
}
//Log.e(TAG,"movingtoscreen"+mCurScreen);
scrollTo(mCurScreen*width,0);
}
/**
*Accordingtothepositionofcurrentlayout
*scrolltothedestinationpage.
*/
publicvoidsnapToDestination(){
finalintscreenWidth=getWidth();
finalintdestScreen=(getScrollX()+screenWidth/2)/screenWidth;
snapToScreen(destScreen);
}
publicvoidsnapToScreen(intwhichScreen){
//getthevalidlayoutpage
whichScreen=Math.max(0,Math.min(whichScreen,getChildCount()-1));
if(getScrollX()!=(whichScreen*getWidth())){
finalintdelta=whichScreen*getWidth()-getScrollX();
mScroller.startScroll(getScrollX(),0,
delta,0,Math.abs(delta)*2);
mCurScreen=whichScreen;
onScreenChangeListener.onScreenChange(mCurScreen);
invalidate();//Redrawthelayout
}
}
publicvoidsetToScreen(intwhichScreen){
whichScreen=Math.max(0,Math.min(whichScreen,getChildCount()-1));
mCurScreen=whichScreen;
scrollTo(whichScreen*getWidth(),0);
}
publicintgetCurScreen(){
returnmCurScreen;
}
@Override
publicvoidcomputeScroll(){
//TODOAuto-generatedmethodstub
if(mScrollerputeScrollOffset()){
scrollTo(mScroller.getCurrX(),mScroller.getCurrY());
postInvalidate();
}
}
@Override
publicbooleanonTouchEvent(MotionEventevent){
//TODOAuto-generatedmethodstub
if(mVelocityTracker==null){
mVelocityTracker=VelocityTracker.obtain();
}
mVelocityTracker.addMovement(event);
finalintaction=event.getAction();
finalfloatx=event.getX();
finalfloaty=event.getY();
switch(action){
caseMotionEvent.ACTION_DOWN:
Log.e(TAG,"eventdown!");
if(!mScroller.isFinished()){
mScroller.abortAnimation();
}
mLastMotionX=x;
break;
caseMotionEvent.ACTION_MOVE:
intdeltaX=(int)(mLastMotionX-x);
mLastMotionX=x;
scrollBy(deltaX,0);
break;
caseMotionEvent.ACTION_UP:
Log.e(TAG,"event:up");
//if(mTouchState==TOUCH_STATE_SCROLLING){
finalVelocityTrackervelocityTracker=mVelocityTracker;
velocityTrackerputeCurrentVelocity(1000);
intvelocityX=(int)velocityTracker.getXVelocity();
Log.e(TAG,"velocityX:"+velocityX);
if(velocityX>SNAP_VELOCITY&;&;mCurScreen>0){
//Flingenoughtomoveleft
//onScreenChangeListener.onScreenChange(mCurScreen-1);
Log.e(TAG,"snapleft");
snapToScreen(mCurScreen-1);
}elseif(velocityX<-SNAP_VELOCITY
&;&;mCurScreen
Log.e(TAG,"snapright");
//onScreenChangeListener.onScreenChange(mCurScreen+1);
snapToScreen(mCurScreen+1);
}else{
snapToDestination();
}
if(mVelocityTracker!=null){
mVelocityTracker.recycle();
mVelocityTracker=null;
}
//}
mTouchState=TOUCH_STATE_REST;
break;
caseMotionEvent.ACTION_CANCEL:
mTouchState=TOUCH_STATE_REST;
break;
}
returntrue;
}
@Override
publicbooleanonInterceptTouchEvent(MotionEventev){
//TODOAuto-generatedmethodstub
Log.e(TAG,"onInterceptTouchEvent-slop:"+mTouchSlop);
finalintaction=ev.getAction();
if((action==MotionEvent.ACTION_MOVE)&;&;
(mTouchState!=TOUCH_STATE_REST)){
returntrue;
}
finalfloatx=ev.getX();
finalfloaty=ev.getY();
switch(action){
caseMotionEvent.ACTION_MOVE:
finalintxDiff=(int)Math.abs(mLastMotionX-x);
if(xDiff>mTouchSlop){
mTouchState=TOUCH_STATE_SCROLLING;
}
break;
caseMotionEvent.ACTION_DOWN:
mLastMotionX=x;
mLastMotionY=y;
mTouchState=mScroller.isFinished()?TOUCH_STATE_REST:TOUCH_STATE_SCROLLING;
break;
caseMotionEvent.ACTION_CANCEL:
caseMotionEvent.ACTION_UP:
mTo
uchState=TOUCH_STATE_REST;
break;
}
returnmTouchState!=TOUCH_STATE_REST;
}
//监听页面变动
publicinterfaceOnScreenChangeListener{
voidonScreenChange(intcurrentIndex);
}
privateOnScreenChangeListeneronScreenChangeListener;
publicvoidsetOnScreenChangeListener(
OnScreenChangeListeneronScreenChangeListener){
this.onScreenChangeListener=onScreenChangeListener;
}
}
PageControlView.java
packagecom.scroll.test;
importcom.scroll.test.ScrollLayout.OnScreenChangeListener;
importcom.yao_guet.test.R;
importandroid.R.integer;
importandroid.content.Context;
importandroid.util.AttributeSet;
importandroid.util.Log;
importandroid.widget.FrameLayout;
importandroid.widget.ImageView;
importandroid.widget.LinearLayout;
publicclassPageControlViewextendsLinearLayout{
privateContextcontext;
privateintcount;
publicPageControlView(Contextcontext){
super(context);
this.context=context;
}
publicPageControlView(Contextcontext,AttributeSetattrs){
super(context,attrs);
this.context=context;
}
publicvoidbindScrollLayout(ScrollLayoutscrollLayout){
this.count=scrollLayout.getChildCount();
Log.v("=count==",count+"=");
//初始化第一屏
generatePageControl(0);
scrollLayout.setOnScreenChangeListener(newOnScreenChangeListener(){
@Override
publicvoidonScreenChange(intcurrentIndex){
generatePageControl(currentIndex);
}
});
}
privatevoidgeneratePageControl(intcurrentIndex){
this.removeAllViews();
for(inti=0;i
ImageViewimageView=newImageView(context);
if(i==currentIndex){
imageView.setImageResource(R.drawable.page_indicator_focused);
}else{
imageView.setImageResource(R.drawable.page_indicator);
}
this.addView(imageView);
}
}
}
main.xml
android:layout_height="fill_parent">
android:id="@+id/ScrollLayoutTest"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
android:layout_width="fill_parent"
android:layout_height="fill_parent">
android:layout_width="fill_parent"
android:layout_height="fill_parent">
android:layout_width="fill_parent"
android:layout_height="fill_parent">
android:layout_width="fill_parent"
android:layout_height="fill_parent">
android:layout_height="
wrap_content"
android:text="Button1"
android:id="@+id/btn1"/>
android:layout_height="wrap_content">
android:layout_height="wrap_content"
android:text="Button2"/>
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true">
如果想设置循环：
设置循环滑屏：
1.在ScrollLayout.java类中的snapToDestination()方法中添加：
//设置使循环（5表示总共有多少屏）
if(destScreen==0){
setToScreen(5);
}elseif(destScreen==5){
setToScreen(0);
}else{
//设置不循环
snapToScreen(destScreen);
}
2.在setToScreen(intwhichScreen)方法中添加：
//设置使循环
onScreenChangeListener.onScreenChange(mCurScreen);