使用ViewPage实现类launcher屏幕滑动
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http://blog.csdn.net/aomandeshangxiao/article/details/7395526
在去年11月份的时候,自己写过一篇launcher左右滑动的源码分析的文章,launcher修改--左右滑动屏幕切换源码追踪,今年1月份的时候,看到一份有意思的代码,又简单的解析了下代码,写成页面滑动切换(类Launcher滑动屏幕实现),今天又看到一篇使用ViewPage来实现页面滑动,感觉不错,有需要这方面资料的大家可以看下:使用ViewPager实现高仿launcher拖动效果。只不过只提供了代码,没有多少分析,关于ViewPage的资料,大家可以百度下,
下面几个资料,个人都感觉不错:
ViewPager example -实现左右两个屏幕的切换Android的 ViewPager 学习笔记,
viewpager循环拖动,
(android控件)ViewPager介绍和使用说明
,感兴趣的童鞋都可以看下,另外,有两篇word的文档,大家也可以下下来看下:
http://download.csdn.net/detail/aomandeshangxiao/4173947
祝大家快乐!他山之石可以攻玉,好好学习天天向上!
网友下面留言给出一个官方更好的demo,大家可以去好好学习下:http://developer.android.com/reference/android/support/v4/view/ViewPager.html
页面滑动切换(类Launcher滑动屏幕实现)
http://blog.csdn.net/aomandeshangxiao/article/details/7196921
下面的这个例子也是从网上找来的,不是自己写的,一直想学习下,但是一直没有写,以前也研究研究的是launcher的页面跳转,launcher修改--左右滑动屏幕切换源码追踪说实话,那个代码有点复杂,所以理解的也不是很透彻。看到这个例子,比较简单些,再这里学习下:
首先,看下效果图吧:虽然很花哨,都是背景图片。
看下他的布局文件:
- <?xmlversion="1.0"encoding="utf-8"?>
- <RelativeLayout
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- xmlns:android="http://schemas.android.com/apk/res/android">
- <com.genius.scroll.MyScrollLayout
- xmlns:android="http://schemas.android.com/apk/res/android"
- android:id="@+id/ScrollLayout"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent">
- <FrameLayout
- android:background="@drawable/guide01"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent">
- </FrameLayout>
- <FrameLayout
- android:background="@drawable/guide02"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent">
- </FrameLayout>
- <FrameLayout
- android:background="@drawable/guide03"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent">
- </FrameLayout>
- <FrameLayout
- android:background="@drawable/guide04"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent">
- </FrameLayout>
- <FrameLayout
- android:background="@drawable/guide05"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent">
- </FrameLayout>
- </com.genius.scroll.MyScrollLayout>
- <LinearLayout
- android:orientation="horizontal"
- android:id="@+id/llayout"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_marginBottom="24.0dip"
- android:layout_alignParentBottom="true"
- android:layout_centerHorizontal="true">
- <ImageViewandroid:clickable="true"
- android:padding="15.0dip"
- android:layout_gravity="center_vertical"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:src="@drawable/guide_round"/>
- <ImageViewandroid:clickable="true"
- android:padding="15.0dip"
- android:layout_gravity="center_vertical"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:src="@drawable/guide_round"/>
- <ImageViewandroid:clickable="true"
- android:padding="15.0dip"
- android:layout_gravity="center_vertical"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:src="@drawable/guide_round"/>
- <ImageViewandroid:clickable="true"
- android:padding="15.0dip"
- android:layout_gravity="center_vertical"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:src="@drawable/guide_round"/>
- <ImageViewandroid:clickable="true"
- android:padding="15.0dip"
- android:layout_gravity="center_vertical"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:src="@drawable/guide_round"/>
- </LinearLayout>
- </RelativeLayout>
底部的LinearLayout是放了5个按钮,上面使用到了一个自定义的控件:MyScrollLayout下面再看下这个自定义控件:里面使用frameLayout放了5张图片。
- publicclass MyScrollLayout extends ViewGroup{
- privatestaticfinal String TAG = "ScrollLayout";
- private VelocityTracker mVelocityTracker; // 用于判断甩动手势
- privatestaticfinalint SNAP_VELOCITY = 600;
- private Scroller mScroller; // 滑动控制器
- privateint mCurScreen;
- privateint mDefaultScreen = 0;
- privatefloat mLastMotionX;
- private OnViewChangeListener mOnViewChangeListener;
- public MyScrollLayout(Context context) {
- super(context);
- init(context);
- }
- public MyScrollLayout(Context context, AttributeSet attrs) {
- super(context, attrs);
- init(context);
- }
- public MyScrollLayout(Context context, AttributeSet attrs, int defStyle) {
- super(context, attrs, defStyle);
- init(context);
- }
- privatevoid init(Context context)
- {
- mCurScreen = mDefaultScreen;
- mScroller =new Scroller(context);
- }
- @Override
- protectedvoid onLayout(boolean changed, int l, int t, int r, int b) {
- // TODO Auto-generated method stub
- if (changed) {
- int childLeft = 0;
- finalint childCount = getChildCount();
- for (int i=0; i<childCount; i++) {
- final View childView = getChildAt(i);
- if (childView.getVisibility() != View.GONE) {
- finalint childWidth = childView.getMeasuredWidth();
- childView.layout(childLeft,0,
- childLeft+childWidth, childView.getMeasuredHeight());
- childLeft += childWidth;
- }
- }
- }
- }
- @Override
- protectedvoid onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
- // TODO Auto-generated method stub
- super.onMeasure(widthMeasureSpec, heightMeasureSpec);
- finalint width = MeasureSpec.getSize(widthMeasureSpec);
- finalint widthMode = MeasureSpec.getMode(widthMeasureSpec);
- finalint count = getChildCount();
- for (int i = 0; i < count; i++) {
- getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec);
- }
- scrollTo(mCurScreen * width,0);
- }
- publicvoid snapToDestination() {
- finalint screenWidth = getWidth();
- finalint destScreen = (getScrollX()+ screenWidth/2)/screenWidth;
- snapToScreen(destScreen);
- }
- publicvoid snapToScreen(int whichScreen) {
- // get the valid layout page
- whichScreen = Math.max(0, Math.min(whichScreen, getChildCount()-1));
- if (getScrollX() != (whichScreen*getWidth())) {
- finalint delta = whichScreen*getWidth()-getScrollX();
- mScroller.startScroll(getScrollX(),0,
- delta,0, Math.abs(delta)*2);
- mCurScreen = whichScreen;
- invalidate();// Redraw the layout
- if (mOnViewChangeListener != null)
- {
- mOnViewChangeListener.OnViewChange(mCurScreen);
- }
- }
- }
- @Override
- publicvoid computeScroll() {
- // TODO Auto-generated method stub
- if (mScroller.computeScrollOffset()) {
- scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
- postInvalidate();
- }
- }
- @Override
- publicboolean onTouchEvent(MotionEvent event) {
- // TODO Auto-generated method stub
- finalint action = event.getAction();
- finalfloat x = event.getX();
- finalfloat y = event.getY();
- switch (action) {
- case MotionEvent.ACTION_DOWN:
- Log.i("","onTouchEvent ACTION_DOWN");
- if (mVelocityTracker == null) {
- mVelocityTracker = VelocityTracker.obtain();
- mVelocityTracker.addMovement(event);
- }
- if (!mScroller.isFinished()){
- mScroller.abortAnimation();
- }
- mLastMotionX = x;
- break;
- case MotionEvent.ACTION_MOVE:
- int deltaX = (int)(mLastMotionX - x);
- if (IsCanMove(deltaX)){
- if (mVelocityTracker != null){
- mVelocityTracker.addMovement(event);
- }
- mLastMotionX = x;
- scrollBy(deltaX,0);
- }
- break;
- case MotionEvent.ACTION_UP:
- int velocityX = 0;
- if (mVelocityTracker != null){
- mVelocityTracker.addMovement(event);
- mVelocityTracker.computeCurrentVelocity(1000);
- velocityX = (int) mVelocityTracker.getXVelocity();
- }
- if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {
- Log.e(TAG,"snap left");
- snapToScreen(mCurScreen -1);
- }elseif (velocityX < -SNAP_VELOCITY
- && mCurScreen < getChildCount() -1) {
- Log.e(TAG,"snap right");
- snapToScreen(mCurScreen +1);
- }else {
- snapToDestination();
- }
- if (mVelocityTracker != null) {
- mVelocityTracker.recycle();
- mVelocityTracker =null;
- }
- break;
- }
- returntrue;
- }
- privateboolean IsCanMove(int deltaX)
- {
- if (getScrollX() <= 0 && deltaX < 0 ){
- returnfalse;
- }
- if (getScrollX() >= (getChildCount() - 1) * getWidth() && deltaX > 0){
- returnfalse;
- }
- returntrue;
- }
- publicvoid SetOnViewChangeListener(OnViewChangeListener listener)
- {
- mOnViewChangeListener = listener;
- }
- }
首先注意,他继承了ViewGroup类,在这里面主要重写了onMeasure()、onTouchEvent()等方法,在这里使用了一个自定义的接口private OnViewChangeListener mOnViewChangeListener。看下它的定义:
- publicinterface OnViewChangeListener {
- publicvoid OnViewChange(int view);
- }
这个接口里之定义了一个回调方法:OnViewChange()这个方法的具体实现,是在主Activity中:
- publicclass SwitchViewDemoActivity extends Activity implements OnViewChangeListener, OnClickListener{
- /** Called when the activity is first created. */
- private MyScrollLayout mScrollLayout;
- private ImageView[] mImageViews;
- privateint mViewCount;
- privateint mCurSel;
- @Override
- publicvoid onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- init();
- }
- privatevoid init()
- {
- mScrollLayout = (MyScrollLayout) findViewById(R.id.ScrollLayout);
- LinearLayout linearLayout = (LinearLayout) findViewById(R.id.llayout);
- mViewCount = mScrollLayout.getChildCount();
- mImageViews =new ImageView[mViewCount];
- for(int i = 0; i < mViewCount; i++) {
- mImageViews[i] = (ImageView) linearLayout.getChildAt(i);
- mImageViews[i].setEnabled(true);
- mImageViews[i].setOnClickListener(this);
- mImageViews[i].setTag(i);
- }
- mCurSel =0;
- mImageViews[mCurSel].setEnabled(false);
- mScrollLayout.SetOnViewChangeListener(this);
- }
- privatevoid setCurPoint(int index)
- {
- if (index < 0 || index > mViewCount - 1 || mCurSel == index) {
- return ;
- }
- mImageViews[mCurSel].setEnabled(true);
- mImageViews[index].setEnabled(false);
- mCurSel = index;
- }
- @Override
- publicvoid OnViewChange(int view) {
- // TODO Auto-generated method stub
- setCurPoint(view);
- }
- @Override
- publicvoid onClick(View v) {
- // TODO Auto-generated method stub
- int pos = (Integer)(v.getTag());
- setCurPoint(pos);
- mScrollLayout.snapToScreen(pos);
- }
- }
这个OnViewChange()方法,主要调用了setCurPoint()方法,就是完成界面的跳转。在MyScrollLayout中的snapToScreen()方法中就是典型的回调方法:
- publicvoid snapToScreen(int whichScreen) {
- // get the valid layout page
- whichScreen = Math.max(0, Math.min(whichScreen, getChildCount()-1));
- if (getScrollX() != (whichScreen*getWidth())) {
- finalint delta = whichScreen*getWidth()-getScrollX();
- mScroller.startScroll(getScrollX(),0,
- delta,0, Math.abs(delta)*2);
- mCurScreen = whichScreen;
- invalidate();// Redraw the layout
- if (mOnViewChangeListener != null)
- {
- mOnViewChangeListener.OnViewChange(mCurScreen);
- }
- }
- }
- mOnViewChangeListener.OnViewChange(mCurScreen);
这句代码就是典型的回调。
在MyScrollLayout的onTouchEvent()的方法里面是对触屏事件做出的响应:
- finalint action = event.getAction();
- finalfloat x = event.getX();
- finalfloat y = event.getY();
- switch (action) {
- case MotionEvent.ACTION_DOWN:
- Log.i("","onTouchEvent ACTION_DOWN");
- if (mVelocityTracker == null) {
- mVelocityTracker = VelocityTracker.obtain();
- mVelocityTracker.addMovement(event);
- }
- if (!mScroller.isFinished()){
- mScroller.abortAnimation();
- }
- mLastMotionX = x;
- break;
- case MotionEvent.ACTION_MOVE:
- int deltaX = (int)(mLastMotionX - x);
- if (IsCanMove(deltaX)){
- if (mVelocityTracker != null){
- mVelocityTracker.addMovement(event);
- }
- mLastMotionX = x;
- scrollBy(deltaX,0);
- }
- break;
- case MotionEvent.ACTION_UP:
- int velocityX = 0;
- if (mVelocityTracker != null){
- mVelocityTracker.addMovement(event);
- mVelocityTracker.computeCurrentVelocity(1000);
- velocityX = (int) mVelocityTracker.getXVelocity();
- }
- if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {
- Log.e(TAG,"snap left");
- snapToScreen(mCurScreen -1);
- }elseif (velocityX < -SNAP_VELOCITY
- && mCurScreen < getChildCount() -1) {
- Log.e(TAG,"snap right");
- snapToScreen(mCurScreen +1);
- }else {
- snapToDestination();
- }
- if (mVelocityTracker != null) {
- mVelocityTracker.recycle();
- mVelocityTracker =null;
- }
- break;
- }
通过判断移动距离和移动方向做出不同的响应。
其他的代码都比较好懂了,有什么问题欢迎大家讨论,下面是代码的下载地址:
http://download.csdn.net/detail/aomandeshangxiao/4017928
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