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这几个动效是从cm里拿出来的，需要修改的代码，在Workspace.java里增加些代码。修改步骤：
定义几个变量和常量：
/*****************************tangxuankai add start**************************/ protected TransitionEffect mTransitionEffect; protected boolean mUseTransitionEffect = true; private boolean mScrollTransformsSet; protected static final float TRANSITION_SCREEN_ROTATION = 35f; protected static float CAMERA_DISTANCE = 6500; protected static final float TRANSITION_SCALE_FACTOR = 0.5f; /*****************************tangxuankai add end**************************/
protected void screenScrolled(int screenCenter) {
………………
/************tangxuankai add to change scroll animation start*************************/
// TODO change ScreenScroll animation
boolean isInOverscroll = false; //mOverScrollX < 0 || mOverScrollX > mMaxScrollX;
// // Apply transition effect and adjacent screen fade if enabled
// SharedPreferences sp = getContext().getSharedPreferences(
// "com.android.launcher3.prefs", Context.MODE_PRIVATE);
int screenEffectNum = 4;//sp.getInt("screenEffect", 0);
for (int i = 0; i < getChildCount(); i++) {
View v = getPageAt(i);
if (v != null) {
float scrollProgress = getScrollProgress(screenCenter, v, i);
switch (screenEffectNum) {
case 0:
changeScreenEffect(isInOverscroll, i, v, scrollProgress,"none");
break;
case 1:
changeScreenEffect(isInOverscroll, i, v, scrollProgress,"cube-out");
break;
case 2:
changeScreenEffect(isInOverscroll, i, v, scrollProgress,"zoom-in");
break;
case 3:
changeScreenEffect(isInOverscroll, i, v, scrollProgress,"stack");
break;
case 4:
changeScreenEffect(isInOverscroll, i, v, scrollProgress,"flip");
break;
case 5:
changeScreenEffect(isInOverscroll, i, v, scrollProgress,"cylinder-in");
break;
case 6:
changeScreenEffect(isInOverscroll, i, v, scrollProgress,"rotate-down");
break;
case 7:
changeScreenEffect(isInOverscroll, i, v, scrollProgress,"accordion");
break;
default:
break;
}
}
}
/************tangxuankai add to change scroll animation end*************************/
}然后在代码里增加：
private void changeScreenEffect(boolean isInOverscroll, int i, View v,
float scrollProgress,String effect) {
TransitionEffect.setFromString(this, effect);
if (mTransitionEffect != null && mUseTransitionEffect && !isInOverscroll) {
mTransitionEffect.screenScrolled(v, i, scrollProgress);
} else if (mScrollTransformsSet) {
v.setPivotX(v.getMeasuredWidth() * 0.5f);
v.setPivotY(v.getMeasuredHeight() * 0.5f);
v.setRotation(0);
v.setRotationX(0);
v.setRotationY(0);
v.setScaleX(1f);
v.setScaleY(1f);
v.setTranslationX(0f);
v.setTranslationY(0f);
v.setVisibility(VISIBLE);
setChildAlpha(v, 1f);
v.setAlpha(1.0f);
}
}
public boolean isLayoutRtl(){
return Utilities.isRtl(mLauncher.getResources());
}
public TransitionEffect getTransitionEffect() {
return mTransitionEffect;
}
public void setTransitionEffect(TransitionEffect effect) {
mTransitionEffect = effect;
// Reset scroll transforms
if (mScrollTransformsSet) {
for (int i = 0; i < getChildCount(); i++) {
View v = getPageAt(i);
if (v != null) {
v.setPivotX(v.getMeasuredWidth() * 0.5f);
v.setPivotY(v.getMeasuredHeight() * 0.5f);
v.setRotation(0);
v.setRotationX(0);
v.setRotationY(0);
v.setScaleX(1f);
v.setScaleY(1f);
v.setTranslationX(0f);
v.setTranslationY(0f);
v.setVisibility(VISIBLE);
setChildAlpha(v, 1f);
}
}
mScrollTransformsSet = false;
}
}
protected void setChildAlpha(View child, float alpha) {
child.setAlpha(alpha);
}
protected static abstract class TransitionEffect {
public static final String TRANSITION_EFFECT_NONE = "none";
public static final String TRANSITION_EFFECT_ZOOM_IN = "zoom-in";
public static final String TRANSITION_EFFECT_ZOOM_OUT = "zoom-out";
public static final String TRANSITION_EFFECT_ROTATE_UP = "rotate-up";
public static final String TRANSITION_EFFECT_ROTATE_DOWN = "rotate-down";
public static final String TRANSITION_EFFECT_CUBE_IN = "cube-in";
public static final String TRANSITION_EFFECT_CUBE_OUT = "cube-out";
public static final String TRANSITION_EFFECT_STACK = "stack";
public static final String TRANSITION_EFFECT_ACCORDION = "accordion";
public static final String TRANSITION_EFFECT_FLIP = "flip";
public static final String TRANSITION_EFFECT_CYLINDER_IN = "cylinder-in";
public static final String TRANSITION_EFFECT_CYLINDER_OUT = "cylinder-out";
public static final String TRANSITION_EFFECT_CROSSFADE = "crossfade";
public static final String TRANSITION_EFFECT_OVERVIEW = "overview";
protected final Workspace mWorkspace;
private final String mName;
public TransitionEffect(Workspace workspace, String name) {
mWorkspace = workspace;
mName = name;
}
public abstract void screenScrolled(View v, int i, float scrollProgress);
public final String getName() {
return mName;
}
public static void setFromString(Workspace workspace, String effect) {
if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_NONE)) {
workspace.setTransitionEffect(null);
} else if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_ZOOM_IN)) {
workspace.setTransitionEffect(new Workspace.TransitionEffect.Zoom(workspace, true));
} else if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_ZOOM_OUT)) {
workspace.setTransitionEffect(new Workspace.TransitionEffect.Zoom(workspace, false));
} else if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_CUBE_IN)) {
workspace.setTransitionEffect(new Workspace.TransitionEffect.Cube(workspace, true));
} else if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_CUBE_OUT)) {
workspace.setTransitionEffect(new Workspace.TransitionEffect.Cube(workspace, false));
} else if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_ROTATE_UP)) {
workspace.setTransitionEffect(new Workspace.TransitionEffect.Rotate(workspace, true));
} else if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_ROTATE_DOWN)) {
workspace.setTransitionEffect(new Workspace.TransitionEffect.Rotate(workspace, false));
} else if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_STACK)) {
workspace.setTransitionEffect(new Workspace.TransitionEffect.Stack(workspace));
} else if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_ACCORDION)) {
workspace.setTransitionEffect(new Workspace.TransitionEffect.Accordion(workspace));
} else if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_FLIP)) {
workspace.setTransitionEffect(new Workspace.TransitionEffect.Flip(workspace));
} else if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_CYLINDER_IN)) {
workspace.setTransitionEffect(new Workspace.TransitionEffect.Cylinder(workspace, true));
} else if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_CYLINDER_OUT)) {
workspace.setTransitionEffect(new Workspace.TransitionEffect.Cylinder(workspace, false));
} else if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_CROSSFADE)) {
workspace.setTransitionEffect(new Workspace.TransitionEffect.Crossfade(workspace));
} else if (effect.equals(Workspace.TransitionEffect.TRANSITION_EFFECT_OVERVIEW)) {
workspace.setTransitionEffect(new Workspace.TransitionEffect.Overview(workspace));
}
}
public static class Zoom extends TransitionEffect {
private boolean mIn;
public Zoom(Workspace workspace, boolean in) {
super(workspace, in ? TRANSITION_EFFECT_ZOOM_IN : TRANSITION_EFFECT_ZOOM_OUT);
mIn = in;
}
@Override
public void screenScrolled(View v, int i, float scrollProgress) {
float scale = 1.0f + (mIn ? -0.8f : 0.4f) * Math.abs(scrollProgress);
// Extra translation to account for the increase in size
if (!mIn) {
float translationX = v.getMeasuredWidth() * 0.1f * -scrollProgress;
v.setTranslationX(translationX);
}
v.setScaleX(scale);
v.setScaleY(scale);
}
}
public static class Rotate extends TransitionEffect {
private boolean mUp;
public Rotate(Workspace pagedView, boolean up) {
super(pagedView, up ? TRANSITION_EFFECT_ROTATE_UP : TRANSITION_EFFECT_ROTATE_DOWN);
mUp = up;
}
@Override
public void screenScrolled(View v, int i, float scrollProgress) {
float rotation =
(mUp ? TRANSITION_SCREEN_ROTATION : -TRANSITION_SCREEN_ROTATION) * scrollProgress;
float translationX = v.getMeasuredWidth() * scrollProgress;
float rotatePoint =
(v.getMeasuredWidth() * 0.5f) /
(float) Math.tan(Math.toRadians((double) (TRANSITION_SCREEN_ROTATION * 0.5f)));
v.setPivotX(v.getMeasuredWidth() * 0.5f);
if (mUp) {
v.setPivotY(-rotatePoint);
} else {
v.setPivotY(v.getMeasuredHeight() + rotatePoint);
}
v.setRotation(rotation);
v.setTranslationX(translationX);
}
}
public static class Cube extends TransitionEffect {
private boolean mIn;
public Cube(Workspace workspace, boolean in) {
super(workspace, in ? TRANSITION_EFFECT_CUBE_IN : TRANSITION_EFFECT_CUBE_OUT);
mIn = in;
}
@Override
public void screenScrolled(View v, int i, float scrollProgress) {
float rotation = (mIn ? 90.0f : -90.0f) * scrollProgress;
v.setPivotX(scrollProgress < 0 ? 0 : v.getMeasuredWidth());
v.setPivotY(v.getMeasuredHeight() * 0.5f);
v.setRotationY(rotation);
}
}
public static class Stack extends TransitionEffect {
private ZInterpolator mZInterpolator = new ZInterpolator(0.5f);
private DecelerateInterpolator mLeftScreenAlphaInterpolator = new DecelerateInterpolator(4);
protected AccelerateInterpolator mAlphaInterpolator = new AccelerateInterpolator(0.9f);
public Stack(Workspace workspace) {
super(workspace, TRANSITION_EFFECT_STACK);
}
@Override
public void screenScrolled(View v, int i, float scrollProgress) {
final boolean isRtl = mWorkspace.isLayoutRtl();
float interpolatedProgress;
float translationX;
float maxScrollProgress = Math.max(0, scrollProgress);
float minScrollProgress = Math.min(0, scrollProgress);
if (mWorkspace.isLayoutRtl()) {
translationX = maxScrollProgress * v.getMeasuredWidth();
interpolatedProgress = mZInterpolator.getInterpolation(Math.abs(maxScrollProgress));
} else {
translationX = minScrollProgress * v.getMeasuredWidth();
interpolatedProgress = mZInterpolator.getInterpolation(Math.abs(minScrollProgress));
}
float scale = (1 - interpolatedProgress) +
interpolatedProgress * TRANSITION_SCALE_FACTOR;
float alpha;
if (isRtl && (scrollProgress > 0)) {
alpha = mAlphaInterpolator.getInterpolation(1 - Math.abs(maxScrollProgress));
} else if (!isRtl && (scrollProgress < 0)) {
alpha = mAlphaInterpolator.getInterpolation(1 - Math.abs(scrollProgress));
} else {
// On large screens we need to fade the page as it nears its leftmost position
alpha = mLeftScreenAlphaInterpolator.getInterpolation(1 - scrollProgress);
}
v.setTranslationX(translationX);
v.setScaleX(scale);
v.setScaleY(scale);
if (v instanceof CellLayout) {
((CellLayout) v).getShortcutsAndWidgets().setAlpha(alpha);
} else {
v.setAlpha(alpha);
}
// If the view has 0 alpha, we set it to be invisible so as to prevent
// it from accepting touches
if (alpha == 0) {
v.setVisibility(INVISIBLE);
} else if (v.getVisibility() != VISIBLE) {
v.setVisibility(VISIBLE);
}
}
}
public static class Accordion extends TransitionEffect {
public Accordion(Workspace workspace) {
super(workspace, TRANSITION_EFFECT_ACCORDION);
}
@Override
public void screenScrolled(View v, int i, float scrollProgress) {
float scale = 1.0f - Math.abs(scrollProgress);
v.setScaleX(scale);
v.setPivotX(scrollProgress < 0 ? 0 : v.getMeasuredWidth());
v.setPivotY(v.getMeasuredHeight() / 2f);
}
}
public static class Flip extends TransitionEffect {
public Flip(Workspace workspace) {
super(workspace, TRANSITION_EFFECT_FLIP);
}
@Override
public void screenScrolled(View v, int i, float scrollProgress) {
float rotation = -180.0f * Math.max(-1f, Math.min(1f, scrollProgress));
v.setCameraDistance(mWorkspace.mDensity * Workspace.CAMERA_DISTANCE);
v.setPivotX(v.getMeasuredWidth() * 0.5f);
v.setPivotY(v.getMeasuredHeight() * 0.5f);
v.setRotationY(rotation);
if (scrollProgress >= -0.5f && scrollProgress <= 0.5f) {
v.setTranslationX(v.getMeasuredWidth() * scrollProgress);
} else {
v.setTranslationX(0f);
}
}
}
public static class Cylinder extends TransitionEffect {
private boolean mIn;
public Cylinder(Workspace workspace, boolean in) {
super(workspace, in ? TRANSITION_EFFECT_CYLINDER_IN : TRANSITION_EFFECT_CYLINDER_OUT);
mIn = in;
}
@Override
public void screenScrolled(View v, int i, float scrollProgress) {
float rotation = (mIn ? TRANSITION_SCREEN_ROTATION : -TRANSITION_SCREEN_ROTATION) * scrollProgress;
v.setPivotX((scrollProgress + 1) * v.getMeasuredWidth() * 0.5f);
v.setPivotY(v.getMeasuredHeight() * 0.5f);
v.setRotationY(rotation);
}
}
public static class Crossfade extends TransitionEffect {
public Crossfade(Workspace workspace) {
super(workspace, TRANSITION_EFFECT_CROSSFADE);
}
@Override
public void screenScrolled(View v, int i, float scrollProgress) {
float alpha = 1 - Math.abs(scrollProgress);
v.setPivotX(v.getMeasuredWidth() * 0.5f);
v.setPivotY(v.getMeasuredHeight() * 0.5f);
v.setAlpha(alpha);
}
}
public static class Overview extends TransitionEffect {
private AccelerateDecelerateInterpolator mScaleInterpolator = new AccelerateDecelerateInterpolator();
public Overview(Workspace workspace) {
super(workspace, TRANSITION_EFFECT_OVERVIEW);
}
@Override
public void screenScrolled(View v, int i, float scrollProgress) {
float scale = 1.0f - 0.1f *
mScaleInterpolator.getInterpolation(Math.min(0.3f, Math.abs(scrollProgress)) / 0.3f);
v.setPivotX(scrollProgress < 0 ? 0 : v.getMeasuredWidth());
v.setPivotY(v.getMeasuredHeight() * 0.5f);
v.setScaleX(scale);
v.setScaleY(scale);
mWorkspace.setChildAlpha(v, scale);
}
}
}Change WorkSpace PageScroll effect
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原文地址：http://blog.csdn.net/tangxuankai/article/details/51351339
