編輯:關於android開發
ScrollLayout.xml文件
- package com.teleca.robin;
- import android.content.Context;
- 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,可以左右滑動切換屏幕的類
- *
- * @author Yao.GUET
- *
- * blog: http://blog.csdn.NET/Yao_GUET
- *
- * date: 2011-05-04
- */
- 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;
- 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
- if (changed) {
- int childLeft = 0;
- final int childCount = getChildCount();
- 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);
- }
- // Log.e(TAG, "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");
- snapToScreen(mCurScreen - 1);
- } else if (velocityX < -SNAP_VELOCITY
- && mCurScreen < getChildCount() - 1) {
- // Fling enough to move right
- Log.e(TAG, "snap right");
- 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;
- }
- }
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