修改Launcher的Workspace，去掉Drag相关的操作，精简为一个支持左右滑动的控件
每屏中可以自由放置layout
主要的问题是对
@Override
public boolean dispathTouchEvent(MotionEvent ev) {}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {}
@Override
public boolean onTouchEvent(MotionEvent ev) {}
的理解，不然不好控制touch事件
代码贴上，其实没啥参考价值:
<?xml version="1.0" encoding="utf-8"?>
<com.mylauncher.Workspace
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:launcher="http://schemas.android.com/apk/res/com.mylauncher"
android:id="@+id/workspace"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="horizontal"
android:fadeScrollbars="true"
launcher:defaultScreen="0">
<com.mylauncher.CellLayoutandroid:background="#ff0000ff"
android:id="@+id/cell1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:textStyle="bold"
android:text="@string/screen1" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:textStyle="bold"
android:text="@string/screen1" />
</com.mylauncher.CellLayout>
<com.mylauncher.CellLayoutandroid:background="#ffff0000"
android:id="@+id/cell2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:textStyle="bold"
android:text="@string/screen2" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:textStyle="bold"
android:text="@string/screen2" />
</com.mylauncher.CellLayout>
<com.mylauncher.CellLayoutandroid:background="#ff00ff00"
android:id="@+id/cell3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:textStyle="bold"
android:text="@string/screen3" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:textStyle="bold"
android:text="@string/screen3" />
</com.mylauncher.CellLayout>
</com.mylauncher.Workspace>
package com.mylauncher;
import android.app.WallpaperManager;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.IBinder;
import android.os.Parcel;
import android.os.Parcelable;
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.ViewParent;
import android.view.animation.Interpolator;
import android.widget.Scroller;
/**
* The workspace is a wide area with a wallpaper and a finite number of screens. Each
* screen contains a number of icons, folders or widgets the user can interact with.
* A workspace is meant to be used with a fixed width only.
*/
public class Workspace extends ViewGroup {
@SuppressWarnings({"UnusedDeclaration"})
private static final String TAG = "MyLauncher.Workspace";
private static final int INVALID_SCREEN = -1;
/**
* The velocity at which a fling gesture will cause us to snap to the next screen
*/
private static final int SNAP_VELOCITY = 600;
private final WallpaperManager mWallpaperManager;
private int mDefaultScreen;
private boolean mFirstLayout = true;
private int mCurrentScreen;
private int mNextScreen = INVALID_SCREEN;
private Scroller mScroller;
private VelocityTracker mVelocityTracker;
/**
* Target drop area calculated during last acceptDrop call.
*/
private int[] mTargetCell = null;
private float mLastMotionX;
private float mLastMotionY;
private final static int TOUCH_STATE_REST = 0;
private final static int TOUCH_STATE_SCROLLING = 1;
private int mTouchState = TOUCH_STATE_REST;
private OnLongClickListener mLongClickListener;
private int[] mTempCell = new int[2];
private int[] mTempEstimate = new int[2];
private boolean mAllowLongPress = true;
private int mTouchSlop;
private int mMaximumVelocity;
private static final int INVALID_POINTER = -1;
private int mActivePointerId = INVALID_POINTER;
private Drawable mPreviousIndicator;
private Drawable mNextIndicator;
private static final float NANOTIME_DIV = 1000000000.0f;
private static final float SMOOTHING_SPEED = 0.75f;
private static final float SMOOTHING_CONSTANT = (float) (0.016 / Math.log(SMOOTHING_SPEED));
private float mSmoothingTime;
private float mTouchX;
private WorkspaceOvershootInterpolator mScrollInterpolator;
private static final float BASELINE_FLING_VELOCITY = 2500.f;
private static final float FLING_VELOCITY_INFLUENCE = 0.4f;
private static class WorkspaceOvershootInterpolator implements Interpolator {
private static final float DEFAULT_TENSION = 1.3f;
private float mTension;
public WorkspaceOvershootInterpolator() {
mTension = DEFAULT_TENSION;
}
public void setDistance(int distance) {
mTension = distance > 0 ? DEFAULT_TENSION / distance : DEFAULT_TENSION;
}
public void disableSettle() {
mTension = 0.f;
}
public float getInterpolation(float t) {
// _o(t) = t * t * ((tension + 1) * t + tension)
// o(t) = _o(t - 1) + 1
t -= 1.0f;
return t * t * ((mTension + 1) * t + mTension) + 1.0f;
}
}
/**
* Used to inflate the Workspace from XML.
*
* @param context The application's context.
* @param attrs The attribtues set containing the Workspace's customization values.
*/
public Workspace(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
/**
* Used to inflate the Workspace from XML.
*
* @param context The application's context.
* @param attrs The attribtues set containing the Workspace's customization values.
* @param defStyle Unused.
*/
public Workspace(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mWallpaperManager = WallpaperManager.getInstance(context);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Workspace, defStyle, 0);
mDefaultScreen = a.getInt(R.styleable.Workspace_defaultScreen, 1);
a.recycle();
setHapticFeedbackEnabled(false);
initWorkspace();
}
/**
* Initializes various states for this workspace.
*/
private void initWorkspace() {
Context context = getContext();
mScrollInterpolator = new WorkspaceOvershootInterpolator();
mScroller = new Scroller(context, mScrollInterpolator);
mCurrentScreen = mDefaultScreen;
final ViewConfiguration configuration = ViewConfiguration.get(getContext());
mTouchSlop = configuration.getScaledTouchSlop();
mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
}
boolean isDefaultScreenShowing() {
return mCurrentScreen == mDefaultScreen;
}
/**
* Returns the index of the currently displayed screen.
*
* @return The index of the currently displayed screen.
*/
int getCurrentScreen() {
return mCurrentScreen;
}
/**
* Sets the current screen.
*
* @param currentScreen
*/
void setCurrentScreen(int currentScreen) {
if (!mScroller.isFinished()) mScroller.abortAnimation();
mCurrentScreen = Math.max(0, Math.min(currentScreen, getChildCount() - 1));
//mPreviousIndicator.setLevel(mCurrentScreen);
//mNextIndicator.setLevel(mCurrentScreen);
scrollTo(mCurrentScreen * getWidth(), 0);
invalidate();
}
/**
* Registers the specified listener on each screen contained in this workspace.
*
* @param l The listener used to respond to long clicks.
*/
@Override
public void setOnLongClickListener(OnLongClickListener l) {
mLongClickListener = l;
final int count = getChildCount();
for (int i = 0; i < count; i++) {
getChildAt(i).setOnLongClickListener(l);
}
}
private void updateWallpaperOffset(int scrollRange) {
IBinder token = getWindowToken();
if (token != null) {
mWallpaperManager.setWallpaperOffsetSteps(1.0f / (getChildCount() - 1), 0 );
mWallpaperManager.setWallpaperOffsets(getWindowToken(),
Math.max(0.f, Math.min(mScrollX/(float)scrollRange, 1.f)), 0);
}
}
@Override
public void scrollTo(int x, int y) {
super.scrollTo(x, y);
mTouchX = x;
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
}
@Override
public void computeScroll() {
if (mScroller.computeScrollOffset()) {
mTouchX = mScrollX = mScroller.getCurrX();
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
mScrollY = mScroller.getCurrY();
postInvalidate();
} else if (mNextScreen != INVALID_SCREEN) {
mCurrentScreen = Math.max(0, Math.min(mNextScreen, getChildCount() - 1));
//mPreviousIndicator.setLevel(mCurrentScreen);
//mNextIndicator.setLevel(mCurrentScreen);
mNextScreen = INVALID_SCREEN;
//clearChildrenCache();
} else if (mTouchState == TOUCH_STATE_SCROLLING) {
final float now = System.nanoTime() / NANOTIME_DIV;
final float e = (float) Math.exp((now - mSmoothingTime) / SMOOTHING_CONSTANT);
final float dx = mTouchX - mScrollX;
mScrollX += dx * e;
mSmoothingTime = now;
// Keep generating points as long as we're more than 1px away from the target
if (dx > 1.f || dx < -1.f) {
postInvalidate();
}
}
}
@Override
protected void dispatchDraw(Canvas canvas) {
boolean restore = false;
int restoreCount = 0;
// ViewGroup.dispatchDraw() supports many features we don't need:
// clip to padding, layout animation, animation listener, disappearing
// children, etc. The following implementation attempts to fast-track
// the drawing dispatch by drawing only what we know needs to be drawn.
boolean fastDraw = mTouchState != TOUCH_STATE_SCROLLING && mNextScreen == INVALID_SCREEN;
// If we are not scrolling or flinging, draw only the current screen
if (fastDraw) {
drawChild(canvas, getChildAt(mCurrentScreen), getDrawingTime());
} else {
final long drawingTime = getDrawingTime();
final float scrollPos = (float) mScrollX / getWidth();
final int leftScreen = (int) scrollPos;
final int rightScreen = leftScreen + 1;
if (leftScreen >= 0) {
drawChild(canvas, getChildAt(leftScreen), drawingTime);
}
if (scrollPos != leftScreen && rightScreen < getChildCount()) {
drawChild(canvas, getChildAt(rightScreen), drawingTime);
}
}
if (restore) {
canvas.restoreToCount(restoreCount);
}
}
protected void onAttachedToWindow() {
super.onAttachedToWindow();
computeScroll();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
final int width = MeasureSpec.getSize(widthMeasureSpec);
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
if (widthMode != MeasureSpec.EXACTLY) {
throw new IllegalStateException("Workspace can only be used in EXACTLY mode.");
}
final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
if (heightMode != MeasureSpec.EXACTLY) {
throw new IllegalStateException("Workspace can only be used in EXACTLY mode.");
}
// The children are given the same width and height as the workspace
final int count = getChildCount();
for (int i = 0; i < count; i++) {
getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec);
}
if (mFirstLayout) {
setHorizontalScrollBarEnabled(false);
scrollTo(mCurrentScreen * width, 0);
setHorizontalScrollBarEnabled(true);
updateWallpaperOffset(width * (getChildCount() - 1));
mFirstLayout = false;
}
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
int childLeft = 0;
final int count = getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != View.GONE) {
final int childchildWidth = child.getMeasuredWidth();
child.layout(childLeft, 0, childLeft + childWidth, child.getMeasuredHeight());
childLeft += childWidth;
}
}
}
@Override
public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) {
int screen = indexOfChild(child);
if (screen != mCurrentScreen || !mScroller.isFinished()) {
snapToScreen(screen);
return true;
}
return false;
}
@Override
public boolean dispatchUnhandledMove(View focused, int direction) {
if (direction == View.FOCUS_LEFT) {
if (getCurrentScreen() > 0) {
snapToScreen(getCurrentScreen() - 1);
return true;
}
} else if (direction == View.FOCUS_RIGHT) {
if (getCurrentScreen() < getChildCount() - 1) {
snapToScreen(getCurrentScreen() + 1);
return true;
}
}
return super.dispatchUnhandledMove(focused, direction);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
/*
* This method JUST determines whether we want to intercept the motion.
* If we return true, onTouchEvent will be called and we do the actual
* scrolling there.
*/
/*
* Shortcut the most recurring case: the user is in the dragging
* state and he is moving his finger.We want to intercept this
* motion.
*/
final int action = ev.getAction();
Log.d(TAG, "onInterceptTouchEvent, action: " + action + " mTouchState: " + mTouchState);
if ((action == MotionEvent.ACTION_MOVE) && (mTouchState != TOUCH_STATE_REST)) {
Log.d(TAG, "onInterceptTouchEvent, MotionEvent.ACTION_MOVE mTouchState: " + mTouchState);
return true;
}
acquireVelocityTrackerAndAddMovement(ev);
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_MOVE: {
Log.d(TAG, "onInterceptTouchEvent.ACTION_MOVE.................");
/*
* mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
* whether the user has moved far enough from his original down touch.
*/
/*
* Locally do absolute value. mLastMotionX is set to the y value
* of the down event.
*/
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
final float x = ev.getX(pointerIndex);
final float y = ev.getY(pointerIndex);
final int xDiff = (int) Math.abs(x - mLastMotionX);
final int yDiff = (int) Math.abs(y - mLastMotionY);
final int touchSlop = mTouchSlop;
boolean xMoved = xDiff > touchSlop;
boolean yMoved = yDiff > touchSlop;
if (xMoved || yMoved) {
if (xMoved) {
Log.d(TAG, "onInterceptTouchEvent.ACTION_MOVE.TOUCH_STATE_SCROLLING................");
// Scroll if the user moved far enough along the X axis
mTouchState = TOUCH_STATE_SCROLLING;
mLastMotionX = x;
mTouchX = getScrollX();
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
//enableChildrenCache(mCurrentScreen - 1, mCurrentScreen + 1);
}
// Either way, cancel any pending longpress
if (mAllowLongPress) {
mAllowLongPress = false;
// Try canceling the long press. It could also have been scheduled
// by a distant descendant, so use the mAllowLongPress flag to block
// everything
final View currentScreen = getChildAt(mCurrentScreen);
currentScreen.cancelLongPress();
}
}
break;
}
case MotionEvent.ACTION_DOWN: {
Log.d(TAG, "onInterceptTouchEvent.ACTION_DOWN.................");
final float x = ev.getX();
final float y = ev.getY();
// Remember location of down touch
mLastMotionX = x;
mLastMotionY = y;
mActivePointerId = ev.getPointerId(0);
mAllowLongPress = true;
/*
* If being flinged and user touches the screen, initiate drag;
* otherwise don't.mScroller.isFinished should be false when
* being flinged.
*/
Log.d(TAG, "mScroller.isFinished()................." + mScroller.isFinished());
mTouchState = mScroller.isFinished() ? TOUCH_STATE_REST : TOUCH_STATE_SCROLLING;
break;
}
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
Log.d(TAG, "onInterceptTouchEvent.ACTION_UP.................");
// Release the drag
//clearChildrenCache();
mTouchState = TOUCH_STATE_REST;
mActivePointerId = INVALID_POINTER;
mAllowLongPress = false;
releaseVelocityTracker();
break;
case MotionEvent.ACTION_POINTER_UP:
Log.d(TAG, "onInterceptTouchEvent.ACTION_POINTER_UP.................");
onSecondaryPointerUp(ev);
break;
}
/*
* The only time we want to intercept motion events is if we are in the
* drag mode.
*/
Log.d(TAG, "onInterceptTouchEvent.mTouchState != TOUCH_STATE_REST................." + (mTouchState != TOUCH_STATE_REST));
return mTouchState != TOUCH_STATE_REST;
}
private void onSecondaryPointerUp(MotionEvent ev) {
final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >>
MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = ev.getPointerId(pointerIndex);
if (pointerId == mActivePointerId) {
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
// TODO: Make this decision more intelligent.
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastMotionX = ev.getX(newPointerIndex);
mLastMotionY = ev.getY(newPointerIndex);
mActivePointerId = ev.getPointerId(newPointerIndex);
if (mVelocityTracker != null) {
mVelocityTracker.clear();
}
}
}
/**
* If one of our descendant views decides that it could be focused now, only
* pass that along if it's on the current screen.
*
* This happens when live folders requery, and if they're off screen, they
* end up calling requestFocus, which pulls it on screen.
*/
@Override
public void focusableViewAvailable(View focused) {
View current = getChildAt(mCurrentScreen);
View v = focused;
while (true) {
if (v == current) {
super.focusableViewAvailable(focused);
return;
}
if (v == this) {
return;
}
ViewParent parent = v.getParent();
if (parent instanceof View) {
v = (View)v.getParent();
} else {
return;
}
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
acquireVelocityTrackerAndAddMovement(ev);
final int action = ev.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
Log.d(TAG, "onTouchEvent.ACTION_DOWN.................");
/*
* If being flinged and user touches, stop the fling. isFinished
* will be false if being flinged.
*/
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}
// Remember where the motion event started
mLastMotionX = ev.getX();
mActivePointerId = ev.getPointerId(0);
if (mTouchState == TOUCH_STATE_SCROLLING) {
//enableChildrenCache(mCurrentScreen - 1, mCurrentScreen + 1);
}
break;
case MotionEvent.ACTION_MOVE:
Log.d(TAG, "onTouchEvent.ACTION_MOVE.................");
if (mTouchState == TOUCH_STATE_SCROLLING) {
Log.d(TAG, "onTouchEvent.ACTION_MOVE.TOUCH_STATE_SCROLLING................");
// Scroll to follow the motion event
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
final float x = ev.getX(pointerIndex);
final float deltaX = mLastMotionX - x;
mLastMotionX = x;
if (deltaX < 0) {
if (mTouchX > 0) {
mTouchX += Math.max(-mTouchX, deltaX);
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
invalidate();
}
} else if (deltaX > 0) {
final float availableToScroll = getChildAt(getChildCount() - 1).getRight() -
mTouchX - getWidth();
if (availableToScroll > 0) {
mTouchX += Math.min(availableToScroll, deltaX);
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
invalidate();
}
} else {
awakenScrollBars();
}
}
break;
case MotionEvent.ACTION_UP:
Log.d(TAG, "onTouchEvent.ACTION_UP.................");
if (mTouchState == TOUCH_STATE_SCROLLING) {
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
final int velocityX = (int) velocityTracker.getXVelocity(mActivePointerId);
final int screenWidth = getWidth();
final int whichScreen = (getScrollX() + (screenWidth / 2)) / screenWidth;
final float scrolledPos = (float) getScrollX() / screenWidth;
if (velocityX > SNAP_VELOCITY && mCurrentScreen > 0) {
// Fling hard enough to move left.
// Don't fling across more than one screen at a time.
final int bound = scrolledPos < whichScreen ?
mCurrentScreen - 1 : mCurrentScreen;
snapToScreen(Math.min(whichScreen, bound), velocityX, true);
} else if (velocityX < -SNAP_VELOCITY && mCurrentScreen < getChildCount() - 1) {
// Fling hard enough to move right
// Don't fling across more than one screen at a time.
final int bound = scrolledPos > whichScreen ?
mCurrentScreen + 1 : mCurrentScreen;
snapToScreen(Math.max(whichScreen, bound), velocityX, true);
} else {
snapToScreen(whichScreen, 0, true);
}
}
mTouchState = TOUCH_STATE_REST;
mActivePointerId = INVALID_POINTER;
releaseVelocityTracker();
break;
case MotionEvent.ACTION_CANCEL:
if (mTouchState == TOUCH_STATE_SCROLLING) {
final int screenWidth = getWidth();
final int whichScreen = (getScrollX() + (screenWidth / 2)) / screenWidth;
snapToScreen(whichScreen, 0, true);
}
mTouchState = TOUCH_STATE_REST;
mActivePointerId = INVALID_POINTER;
releaseVelocityTracker();
break;
case MotionEvent.ACTION_POINTER_UP:
Log.d(TAG, "onTouchEvent.ACTION_POINTER_UP.................");
onSecondaryPointerUp(ev);
break;
}
return true;
}
private void acquireVelocityTrackerAndAddMovement(MotionEvent ev) {
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(ev);
}
private void releaseVelocityTracker() {
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
}
void snapToScreen(int whichScreen) {
snapToScreen(whichScreen, 0, false);
}
private void snapToScreen(int whichScreen, int velocity, boolean settle) {
//if (!mScroller.isFinished()) return;
whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1));
//enableChildrenCache(mCurrentScreen, whichScreen);
mNextScreen = whichScreen;
//mPreviousIndicator.setLevel(mNextScreen);
//mNextIndicator.setLevel(mNextScreen);
View focusedChild = getFocusedChild();
if (focusedChild != null && whichScreen != mCurrentScreen &&
focusedChild == getChildAt(mCurrentScreen)) {
focusedChild.clearFocus();
}
final int screenDelta = Math.max(1, Math.abs(whichScreen - mCurrentScreen));
final int newX = whichScreen * getWidth();
final int delta = newX - mScrollX;
int duration = (screenDelta + 1) * 100;
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}
if (settle) {
mScrollInterpolator.setDistance(screenDelta);
} else {
mScrollInterpolator.disableSettle();
}
velocity = Math.abs(velocity);
if (velocity > 0) {
duration += (duration / (velocity / BASELINE_FLING_VELOCITY))
* FLING_VELOCITY_INFLUENCE;
} else {
duration += 100;
}
awakenScrollBars(duration);
mScroller.startScroll(mScrollX, 0, delta, 0, duration);
invalidate();
}
@Override
protected Parcelable onSaveInstanceState() {
final SavedState state = new SavedState(super.onSaveInstanceState());
state.currentScreen = mCurrentScreen;
return state;
}
@Override
protected void onRestoreInstanceState(Parcelable state) {
SavedState savedState = (SavedState) state;
super.onRestoreInstanceState(savedState.getSuperState());
if (savedState.currentScreen != -1) {
mCurrentScreen = savedState.currentScreen;
}
}
public void scrollLeft() {
Log.d(TAG, "scrollLeft.................");
if (mScroller.isFinished()) {
if (mCurrentScreen > 0) snapToScreen(mCurrentScreen - 1);
} else {
if (mNextScreen > 0) snapToScreen(mNextScreen - 1);
}
}
public void scrollRight() {
Log.d(TAG, "scrollRight.................");
if (mScroller.isFinished()) {
if (mCurrentScreen < getChildCount() -1) snapToScreen(mCurrentScreen + 1);
} else {
if (mNextScreen < getChildCount() -1) snapToScreen(mNextScreen + 1);
}
}
public int getScreenForView(View v) {
int result = -1;
if (v != null) {
ViewParent vvp = v.getParent();
int count = getChildCount();
for (int i = 0; i < count; i++) {
if (vp == getChildAt(i)) {
return i;
}
}
}
return result;
}
/**
* @return True is long presses are still allowed for the current touch
*/
public boolean allowLongPress() {
return mAllowLongPress;
}
/**
* Set true to allow long-press events to be triggered, usually checked by
* {@link Launcher} to accept or block dpad-initiated long-presses.
*/
public void setAllowLongPress(boolean allowLongPress) {
mAllowLongPress = allowLongPress;
}
void moveToDefaultScreen(boolean animate) {
if (animate) {
snapToScreen(mDefaultScreen);
} else {
setCurrentScreen(mDefaultScreen);
}
getChildAt(mDefaultScreen).requestFocus();
}
//void setIndicators(Drawable previous, Drawable next) {
//mPreviousIndicator = previous;
//mNextIndicator = next;
//previous.setLevel(mCurrentScreen);
//next.setLevel(mCurrentScreen);
//}
public static class SavedState extends BaseSavedState {
int currentScreen = -1;
SavedState(Parcelable superState) {
super(superState);
}
private SavedState(Parcel in) {
super(in);
currentScreen = in.readInt();
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeInt(currentScreen);
}
public static final Parcelable.Creator<SavedState> CREATOR =
new Parcelable.Creator<SavedState>() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
}
package com.mylauncher;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;
import android.view.MotionEvent;
import android.util.Log;
public class CellLayout extends LinearLayout {
private static final String TAG = "MyLauncher.CellLayout";
public CellLayout(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
Log.d(TAG, "onInterceptTouchEvent, action=" + ev.getAction());
return true;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
Log.d(TAG, "onTouchEvent, action=" + ev.getAction());
return true;
}
}
