package com.genius.scroll;
import android.R.bool;
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.view.View.MeasureSpec;
import android.widget.Scroller;
public class MyScrollLayout extends ViewGroup{
private static final String TAG = "ScrollLayout";
private VelocityTracker mVelocityTracker; // 用于判断甩动手势
private static final int SNAP_VELOCITY = 600;
private Scroller mScroller; // 滑动控制器
private int mCurScreen;
private int mDefaultScreen = 0;
private float mLastMotionX;
// private int mTouchSlop;
// private static final int TOUCH_STATE_REST = 0;
// private static final int TOUCH_STATE_SCROLLING = 1;
// private int mTouchState = TOUCH_STATE_REST;
private OnViewChangeListener mOnViewChangeListener;
public MyScrollLayout(Context context) {
super(context);
// TODO Auto-generated constructor stub
init(context);
}
public MyScrollLayout(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
init(context);
}
public MyScrollLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
init(context);
}
private void init(Context context)
{
mCurScreen = mDefaultScreen;
// mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
mScroller = new Scroller(context);
}
@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) {
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
final int width = MeasureSpec.getSize(widthMeasureSpec);
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
final int count = getChildCount();
for (int i = 0; i < count; i++) {
getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec);
}
scrollTo(mCurScreen * width, 0);
}
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
if (mOnViewChangeListener != null)
{
mOnViewChangeListener.OnViewChange(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
final int action = event.getAction();
final float x = event.getX();
final float 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) {
// 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;
}
return true;
}
private boolean IsCanMove(int deltaX)
{
if (getScrollX() <= 0 && deltaX < 0 ){
return false;
}
if (getScrollX() >= (getChildCount() - 1) * getWidth() && deltaX > 0){
return false;
}
return true;
}
public void SetOnViewChangeListener(OnViewChangeListener listener)
{
mOnViewChangeListener = listener;
}
}
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左右切换.rar (38个子文件)
SwitchViewDemo
AndroidManifest.xml 1KB
res
layout
main_viewpage_layout.xml 2KB
layout.xml 212B
main.xml 3KB
drawable-ldpi
icon.png 2KB
drawable
guide_round.xml 302B
drawable-mdpi
icon.png 3KB
drawable-hdpi
guide02.9.png 33KB
guide05.9.png 34KB
guide_dot_black.png 192B
guide01.9.png 42KB
guide04.9.png 36KB
guide_dot_white.png 192B
guide03.9.png 40KB
icon.png 4KB
values
strings.xml 187B
proguard.cfg 1KB
src
com
genius
scroll
MyScrollLayout.java 7KB
OnViewChangeListener.java 112B
demo
SwitchViewDemoActivity.java 2KB
bin
com
genius
scroll
OnViewChangeListener.class 169B
MyScrollLayout.class 5KB
demo
R.class 510B
R$layout.class 450B
R$attr.class 331B
R$id.class 445B
R$string.class 418B
SwitchViewDemoActivity.class 2KB
R$drawable.class 659B
SwitchViewDemoActivity.apk 444KB
classes.dex 149KB
resources.ap_ 375KB
.classpath 345B
assets
default.properties 362B
.settings
org.eclipse.core.resources.prefs 88B
.project 850B
gen
com
genius
demo
R.java 1KB
lib
android-support-v4.jar 137KB
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