PullToDismissPager点击按钮，从底部弹出对话框，对话框可以是多个滑动界面，里面可以放各式各样的布局，随性而发
这是个eclipse的demo，
PullToDismissPager
package com.mrbug.pulltodismisspager;
import android.annotation.SuppressLint;
/**
* Created by krntija on 9/2/14.
*/
public class PullToDismissPager extends ViewGroup {
private static final String TAG = PullToDismissPager.class.getSimpleName();
/**
* Default initial state for the component
*/
private static SlideState DEFAULT_SLIDE_STATE = SlideState.COLLAPSED;
/**
* If no fade color is given by default it will fade to 80% gray.
*/
private static final int DEFAULT_FADE_COLOR = 0x99000000;
/**
* Default Minimum velocity that will be detected as a fling
*/
private static final int DEFAULT_MIN_FLING_VELOCITY = 400; // dips per second
/**
* Default attributes for layout
*/
private static final int[] DEFAULT_ATTRS = new int[] {
android.R.attr.gravity
};
/**
* Minimum velocity that will be detected as a fling
*/
private int mMinFlingVelocity = DEFAULT_MIN_FLING_VELOCITY;
/**
* The fade color used for the panel covered by the slider. 0 = no fading.
*/
private int mCoveredFadeColor = DEFAULT_FADE_COLOR;
/**
* The paint used to dim the main layout when sliding
*/
private final Paint mCoveredFadePaint = new Paint();
/**
* True if the collapsed panel should be dragged up.
*/
private boolean mIsSlidingUp;
/**
* If provided, the panel can be dragged by only this view. Otherwise, the entire panel can be
* used for dragging.
*/
private View mDragView;
/**
* The child view that can slide, if any.
*/
private View mSlideableView;
/**
* The main view
*/
private View mMainView;
/**
* Current state of the slideable view.
*/
private enum SlideState {
EXPANDED,
COLLAPSED,
HIDDEN,
DRAGGING
}
private SlideState mSlideState = SlideState.COLLAPSED;
/**
* How far the panel is offset from its expanded position.
* range [0, 1] where 0 = collapsed, 1 = expanded.
*/
private float mSlideOffset;
/**
* How far in pixels the slideable panel may move.
*/
private int mSlideRange;
/**
* A panel view is locked into internal scrolling or another condition that
* is preventing a drag.
*/
private boolean mIsUnableToDrag;
/**
* Flag indicating that sliding feature is enabled\disabled
*/
private boolean mIsSlidingEnabled;
/**
* Flag indicating if a drag view can have its own touch events. If set
* to true, a drag view can scroll horizontally and have its own click listener.
*
* Default is set to false.
*/
private boolean mIsUsingDragViewTouchEvents;
private float mInitialMotionX;
private float mInitialMotionY;
private float mAnchorPoint = 1.f;
private PanelSlideListener mPanelSlideListener;
private final ViewDragHelper mDragHelper;
private ViewPager mViewPager;
/**
* Stores whether or not the pane was expanded the last time it was slideable.
* If expand/collapse operations are invoked this state is modified. Used by
* instance state save/restore.
*/
private boolean mFirstLayout = true;
private final Rect mTmpRect = new Rect();
/**
* Listener for monitoring events about sliding panes.
*/
public interface PanelSlideListener {
/**
* Called when a sliding pane's position changes.
* @param panel The child view that was moved
* @param slideOffset The new offset of this sliding pane within its range, from 0-1
*/
public void onPanelSlide(View panel, float slideOffset);
/**
* Called when a sliding panel becomes slid completely collapsed.
* @param panel The child view that was slid to an collapsed position
*/
public void onPanelCollapsed(View panel);
/**
* Called when a sliding panel becomes slid completely expanded.
* @param panel The child view that was slid to a expanded position
*/
public void onPanelExpanded(View panel);
/**
* Called when a sliding panel becomes anchored.
* @param panel The child view that was slid to a anchored position
*/
public void onPanelAnchored(View panel);
/**
* Called when a sliding panel becomes completely hidden.
* @param panel The child view that was slid to a hidden position
*/
public void onPanelHidden(View panel);
}
/**
* No-op stubs for {@link PanelSlideListener}. If you only want to implement a subset
* of the listener methods you can extend this instead of implement the full interface.
*/
public static class SimplePanelSlideListener implements PanelSlideListener {
@Override
public void onPanelSlide(View panel, float slideOffset) {
}
@Override
public void onPanelCollapsed(View panel) {
}
@Override
public void onPanelExpanded(View panel) {
}
@Override
public void onPanelAnchored(View panel) {
}
@Override
public void onPanelHidden(View panel) {
}
}
public PullToDismissPager(Context context) {
this(context, null);
}
public PullToDismissPager(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public PullToDismissPager(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
if(isInEditMode()) {
mDragHelper = null;
return;
}
if (attrs != null) {
TypedArray defAttrs = context.obtainStyledAttributes(attrs, DEFAULT_ATTRS);
if (defAttrs != null) {
int gravity = defAttrs.getInt(0, Gravity.BOTTOM);
if (gravity != Gravity.TOP && gravity != Gravity.BOTTOM) {
throw new IllegalArgumentException("gravity must be set to either top or bottom");
}
mIsSlidingUp = gravity == Gravity.BOTTOM;
}
defAttrs.recycle();
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.PullToDismissPager);
if (ta != null) {
mMinFlingVelocity = ta.getInt(R.styleable.PullToDismissPager_flingVelocity, DEFAULT_MIN_FLING_VELOCITY);
mCoveredFadeColor = ta.getColor(R.styleable.PullToDismissPager_fadeColor, DEFAULT_FADE_COLOR);
mSlideState = SlideState.values()[ta.getInt(R.styleable.PullToDismissPager_initialState, DEFAULT_SLIDE_STATE.ordinal())];
}
ta.recycle();
}
final float density = context.getResources().getDisplayMetrics().density;
setWillNotDraw(false);
mDragHelper = ViewDragHelper.create(this, 0.5f, new DragHelperCallback());
mDragHelper.setMinVelocity(mMinFlingVelocity * density);
mIsSlidingEnabled = true;
mViewPager = new ViewPager(context);
}
/**
* Set the color used to fade the pane covered by the sliding pane out when the pane
* will become fully covered in the expanded state.
*
* @param color An ARGB-packed color value
*/
public void setCoveredFadeColor(int color) {
mCoveredFadeColor = color;
invalidate();
}
/**
* @return The ARGB-packed color value used to fade the fixed pane
*/
public int getCoveredFadeColor() {
return mCoveredFadeColor;
}
/**
* Set sliding enabled flag
* @param enabled flag value
*/
public void setSlidingEnabled(boolean enabled) {
mIsSlidingEnabled = enabled;
}
public boolean isSlidingEnabled() {
return mIsSlidingEnabled && mSlideableView != null;
}
/**
* Sets the panel slide listener
* @param listener
*/
public void setPanelSlideListener(PanelSlideListener listener) {
mPanelSlideListener = listener;
}
public ViewPager getViewPager(){
return mViewPager;
}
public void setPagerAdapter(PagerAdapter pagerAdapter){
if(this.mViewPager != null)
this.mViewPager.setAdapter(pagerAdapter);
}
/**
* Set the draggable view portion. Use to null, to allow the whole panel to be draggable
*
* @param dragView A view that will be used to drag the panel.
*/
public void setDragView(View dragView) {
if (mDragView != null) {
mDragView.setOnClickListener(null);
}
mDragView = dragView;
if (mDragView != null) {
mDragView.setClickable(true);
mDragView.setFocusable(false);
mDragView.setFocusableInTouchMode(false);
mDragView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (!isEnabled()) return;
if (!isPanelExpanded()) {
expandPanel(mAnchorPoint);
} else {
collapsePanel();
}
}
});;
}
}
void dispatchOnPanelSlide(View panel) {
if (mPanelSlideListener != null) {
mPanelSlideListener.onPanelSlide(panel, mSlideOffset);
}
}
void dispatchOnPanelExpanded(View panel) {
if (mPanelSlideListener != null) {
mPanelSlideListener.onPanelExpanded(panel);
}
sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
}
void dispatchOnPanelCollapsed(View panel) {
if (mPanelSlideListener != null) {
mPanelSlideListener.onPanelCollapsed(panel);
}
sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
}
void dispatchOnPanelAnchored(View panel) {
if (mPanelSlideListener != null) {
mPanelSlideListener.onPanelAnchored(panel);
}
sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
}
void dispatchOnPanelHidden(View panel) {
if (mPanelSlideListener != null) {
mPanelSlideListener.onPanelHidden(panel);
}
sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
}
void updateObscuredViewVisibility() {
if (getChildCount() == 0) {
return;
}
final int leftBound = getPaddingLeft();
final int rightBound = getWidth() - getPaddingRight();
final int topBound = getPaddingTop();
final int bottomBound = getHeight() - getPaddingBottom();
final int left;
final int right;
final int top;
final int bottom;
if (mSlideableView != null && hasOpaqueBackground(mSlideableView)) {
left = mSlideableView.getLeft();
right = mSlideableView.getRight();
top = mSlideableView.getTop();
bottom = mSlideableView.getBottom();
} else {
left = right = top = bottom = 0;
}
View child = getChildAt(0);
final int clampedChildLeft = Math.max(leftBound, child.getLeft());
final int clampedChildTop = Math.max(topBound, child.getTop());
final int clampedChildRight = Math.min(rightBound, child.getRight());
final int clampedChildBottom = Math.min(bottomBound, child.getBottom());
final int vis;
if (clampedChildLeft >= left && clampedChildTop >= top &&
clampedChildRight <= right && clampedChildBottom <= bottom) {
vis = INVISIBLE;
} else {
vis = VISIBLE;
}
child.setVisibility(vis);
}
void setAllChildrenVisible() {
for (int i = 0, childCount = getChildCount(); i < childCount; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == INVISIBLE) {
child.setVisibility(VISIBLE);
}
}
}
private static boolean hasOpaqueBackground(View v) {
final Drawable bg = v.getBackground();
return bg != null && bg.getOpacity() == PixelFormat.OPAQUE;
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
this.addView(mViewPager);
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
mFirstLayout = true;
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mFirstLayout = true;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
final int heightSize = MeasureSpec.getSize(heightMeasureSpec);
if (widthMode != MeasureSpec.EXACTLY) {
throw new IllegalStateException("Width must have an exact value or MATCH_PARENT");
} else if (heightMode != MeasureSpec.EXACTLY) {
throw new IllegalStateException("Height must have an exact value or MATCH_PARENT");
}
final int childCount = getChildCount();
if (childCount != 2) {
throw new IllegalStateException("You can add exactly 1 child!");
}
mMainView = getChildAt(0);
mSlideableView = getChildAt(1);
if (mDragView == null) {
setDragView(mSlideableView);
}
// If the sliding panel is not visible, then put the whole view in the hidden state
if (mSlideableView.getVisibility() == GONE) {
mSlideState = SlideState.HIDDEN;
}
int layoutHeight = heightSize - getPaddingTop() - getPaddingBottom();
// First pass. Measure based on child LayoutParams width/height.
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
// We always measure the sliding panel in order to know it's height (needed for show panel)
if (child.getVisibility() == GONE && i == 0) {
continue;
}
int height = layoutHeight;
int childWidthSpec;
if (lp.width == LayoutParams.WRAP_CONTENT) {
childWidthSpec = MeasureSpec.makeMeasureSpec(widthSize, MeasureSpec.AT_MOST);
} else if (lp.width == LayoutParams.MATCH_PARENT) {
childWidthSpec = MeasureSpec.makeMeasureSpec(widthSize, MeasureSpec.EXACTLY);
} else {
childWidthSpec = MeasureSpec.makeMeasureSpec(lp.width, MeasureSpec.EXACTLY);
}
int childHeightSpec;
if (lp.height == LayoutParams.WRAP_CONTENT) {
childHeightSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST);
} else if (lp.height == LayoutParams.MATCH_PARENT) {
childHeightSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
} else {
childHeightSpec = MeasureSpec.makeMeasureSpec(lp.height, MeasureSpec.EXACTLY);
}
child.measure(childWidthSpec, childHeightSpec);
if (child == mSlideableView) {
mSlideRange = mSlideableView.getMeasuredHeight();
}
}
setMeasuredDimension(widthSize, heightSize);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final int paddingLeft = getPaddingLeft();
final int paddingTop = getPaddingTop();
final int childCount = getChildCount();
if (mFirstLayout) {
switch (mSlideState) {
case EXPANDED:
mSlideOffset = 1.0f;
break;
case HIDDEN:
int newTop = computePanelTopPosition(0.0f);
mSlideOffset = computeSlideOffset(newTop);
break;
default:
mSlideOffset = 0.f;
break;
}
}
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
// Always layout the sliding view on the first layout
if (child.getVisibility() == GONE && (i == 0 || mFirstLayout)) {
continue;
}
final int childHeight = child.getMeasuredHeight();
int childTop = paddingTop;
if (child == mSlideableView) {
childTop = computePanelTopPosition(mSlideOffset);
}
if (!mIsSlidingUp) {
if (child == mMainView) {
childTop = computePanelTopPosition(mSlideOffset) + mSlideableView.getMeasuredHeight();
}
}
final int childBottom = childTop + childHeight;
final int childLeft = paddingLeft;
final int childRight = childLeft + child.getMeasuredWidth();
child.layout(childLeft, childTop, childRight, childBottom);
}
if (mFirstLayout) {
updateObscuredViewVisibility();
}
mFirstLayout = false;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
// Recalculate sliding panes and their details
if (h != oldh) {
mFirstLayout = true;
}
}
/**
* Set if the drag view can have its own touch events. If set
* to true, a drag view can scroll horizontally and have its own click listener.
*
* Default is set to false.
*/
public void setEnableDragViewTouchEvents(boolean enabled) {
mIsUsingDragViewTouchEvents = enabled;
}
@Override
public void setEnabled(boolean enabled) {
if (!enabled) {
collapsePanel();
}
super.setEnabled(enabled);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
final int action = MotionEventCompat.getActionMasked(ev);
if (!isEnabled() || !mIsSlidingEnabled || (mIsUnableToDrag && action != MotionEvent.ACTION_DOWN)) {
mDragHelper.cancel();
return super.onInterceptTouchEvent(ev);
}
if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
mDragHelper.cancel();
return false;
}
final float x = ev.getX();
final float y = ev.getY();
switch (action) {
case MotionEvent.ACTION_DOWN: {
mIsUnableToDrag = false;
mInitialMotionX = x;
mInitialMotionY = y;
break;
}
case MotionEvent.ACTION_MOVE: {
final float adx = Math.abs(x - mInitialMotionX);
final float ady = Math.abs(y - mInitialMotionY);
final int dragSlop = mDragHelper.getTouchSlop();
// Handle any horizontal scrolling on the drag view.
if (mIsUsingDragViewTouchEvents && adx > dragSlop && ady < dragSlop) {
return super.onInterceptTouchEvent(ev);
}
if ((ady > dragSlop && adx > ady) || !isDragViewUnder((int)mInitialMotionX, (int)mInitialMotionY)) {
mDragHelper.cancel();
mIsUnableToDrag = true;
return false;
}
break;
}
}
return mDragHelper.shouldInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (!isSlidingEnabled()) {
return super.onTouchEvent(ev);
}
mDragHelper.processTouchEvent(ev);
return true;
}
private boolean isDragViewUnder(int x, int y) {
if (mDragView == null) return false;
int[] viewLocation = new int[2];
mDragView.getLocationOnScreen(viewLocation);
int[] parentLocation = new int[2];
this.getLocationOnScreen(parentLocation);
int screenX = parentLocation[0] + x;
int screenY = parentLocation[1] + y;
return screenX >= viewLocation[0] && screenX < viewLocation[0] + mDragView.getWidth() &&
screenY >= viewLocation[1] && screenY < viewLocation[1] + mDragView.getHeight();
}
private boolean expandPanel(View pane, int initialVelocity, float mSlideOffset) {
return mFirstLayout || smoothSlideTo(mSlideOffset, initialVelocity);
}
private boolean collapsePanel(View pane, int initialVelocity) {
return mFirstLayout || smoothSlideTo(0.0f, initialVelocity);
}
/*
* Computes the top position of the panel based on the slide offset.
*/
private int computePanelTopPosition(float slideOffset) {
int slidingViewHeight = mSlideableView != null ? mSlideableView.getMeasuredHeight() : 0;
int slidePixelOffset = (int) (slideOffset * mSlideRange);
// Compute the top of the panel if its collapsed
return mIsSlidingUp
? getMeasuredHeight() - getPaddingBottom() - slidePixelOffset
: getPaddingTop() - slidingViewHeight + slidePixelOffset;
}
/*
* Computes the slide offset based on the top position of the panel
*/
private float computeSlideOffset(int topPosition) {
// Compute the panel top position if the panel is collapsed (offset 0)
final int topBoundCollapsed = computePanelTopPosition(0);
// Determine the new slide offset based on the collapsed top position and the new required
// top position
return (mIsSlidingUp
? (float) (topBoundCollapsed - topPosition) / mSlideRange
: (float) (topPosition - topBoundCollapsed) / mSlideRange);
}
/**
* Collapse the sliding pane if it is currently slideable. If first layout
* has already completed this will animate.
*
* @return true if the pane was slideable and is now collapsed/in the process of collapsing
*/
public boolean collapsePanel() {
if (mFirstLayout) {
mSlideState = SlideState.COLLAPSED;
return true;
} else {
if (mSlideState == SlideState.HIDDEN || mSlideState == SlideState.COLLAPSED)
return false;
return collapsePanel(mSlideableView, 0);
}
}
/**
* Expand the sliding pane if it is currently slideable.
*
* @return true if the pane was slideable and is now expanded/in the process of expading
*/
public boolean expandPanel() {
if (mFirstLayout) {
mSlideState = SlideState.EXPANDED;
return true;
} else {
return expandPanel(1.0f);
}
}
/**
* Partially expand the sliding panel up to a specific offset
*
* @param mSlideOffset Value between 0 and 1, where 0 is completely expanded.
* @return true if the pane was slideable and is now expanded/in the process of expanding
*/
public boolean expandPanel(float mSlideOffset) {
if (mSlideableView == null || mSlideState == SlideState.EXPANDED) return false;
mSlideableView.setVisibility(View.VISIBLE);
return expandPanel(mSlideableView, 0, mSlideOffset);
}
/**
* Check if the sliding panel in this layout is fully expanded.
*
* @return true if sliding panel is completely expanded
*/
public boolean isPanelExpanded() {
return mSlideState == SlideState.EXPANDED;
}
/**
* Check if the sliding panel in this layout is currently visible.
*
* @return true if the sliding panel is visible.
*/
public boolean isPanelHidden() {
return mSlideState == SlideState.HIDDEN;
}
/**
* Shows the panel from the hidden state
*/
public void showPanel() {
if (mFirstLayout) {
mSlideState = SlideState.COLLAPSED;
} else {
if (mSlideableView == null || mSlideState != SlideState.HIDDEN) return;
mSlideableView.setVisibility(View.VISIBLE);
requestLayout();
smoothSlideTo(0, 0);
}
}
/**
* Hides the sliding panel entirely.
*/
public void hidePanel() {
if (mFirstLayout) {
mSlideState = SlideState.HIDDEN;
} else {
if (mSlideState == SlideState.DRAGGING || mSlideState == SlideState.HIDDEN) return;
int newTop = computePanelTopPosition(0.0f);
smoothSlideTo(computeSlideOffset(newTop), 0);
}
}
@SuppressLint("NewApi")
private void onPanelDragged(int newTop) {
mSlideState = SlideState.DRAGGING;
// Recompute the slide offset based on the new top position
mSlideOffset = computeSlideOffset(newTop);
// Dispatch the slide event
dispatchOnPanelSlide(mSlideableView);
// If the slide offset is negative, and overlay is not on, we need to increase the
// height of the main content
if (mSlideOffset <= 0) {
// expand the main view
LayoutParams lp = (LayoutParams)mMainView.getLayoutParams();
lp.height = mIsSlidingUp ? (newTop - getPaddingBottom()) : (getHeight() - getPaddingBottom() - mSlideableView.getMeasuredHeight() - newTop);
mMainView.requestLayout();
}
}
@Override
protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
boolean result;
final int save = canvas.save(Canvas.CLIP_SAVE_FLAG);
if (isSlidingEnabled() && mSlideableView != child) {
canvas.getClipBounds(mTmpRect);
canvas.clipRect(mTmpRect);
}
if (mCoveredFadeColor != 0 && mSlideOffset > 0) {
final int baseAlpha = (mCoveredFadeColor & 0xff000000) >>> 24;
final int imag = (int) (baseAlpha * mSlideOffset);
final int color = imag << 24 | (mCoveredFadeColor & 0xffffff);
mCoveredFadePaint.setColor(color);
canvas.drawRect(mTmpRect, mCoveredFadePaint);
}
result = super.drawChild(canvas, child, drawingTime);
canvas.restoreToCount(save);
return result;
}
/**
* Smoothly animate mDraggingPane to the target X position within its range.
*
* @param slideOffset position to animate to
* @param velocity initial velocity in case of fling, or 0.
*/
boolean smoothSlideTo(float slideOffset, int velocity) {
if (!isSlidingEnabled()) {
// Nothing to do.
return false;
}
int panelTop = computePanelTopPosition(slideOffset);
if (mDragHelper.smoothSlideViewTo(mSlideableView, mSlideableView.getLeft(), panelTop)) {
setAllChildrenVisible();
ViewCompat.postInvalidateOnAnimation(this);
return true;
}
return false;
}
@Override
public void computeScroll() {
if (mDragHelper != null && mDragHelper.continueSettling(true)) {
if (!isSlidingEnabled()) {
mDragHelper.abort();
return;
}
ViewCompat.postInvalidateOnAnimation(this);
}
}
@Override
public void draw(Canvas c) {
super.draw(c);
if (!isSlidingEnabled()) {
// No need to draw a shadow if we don't have one.
return;
}
}
@Override
protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
return new LayoutParams();
}
@Override
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof MarginLayoutParams
? new LayoutParams((MarginLayoutParams) p)
: new LayoutParams(p);
}
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof LayoutParams && super.checkLayoutParams(p);
}
@Override
public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
return new LayoutParams(getContext(), attrs);
}
@Override
public Parcelable onSaveInstanceState() {
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);
ss.mSlideState = mSlideState;
return ss;
}
@Override
public void onRestoreInstanceState(Parcelable state) {
SavedState ss = (SavedState) state;
super.onRestoreInstanceState(ss.getSuperState());
mSlideState = ss.mSlideState;
}
private class DragHelperCallback extends ViewDragHelper.Callback {
@Override
public boolean tryCaptureView(View child, int pointerId) {
if (mIsUnableToDrag) {
return false;
}
return child == mSlideableView;
}
@Override
public void onViewDragStateChanged(int state) {
if (mDragHelper.getViewDragState() == ViewDragHelper.STATE_IDLE) {
mSlideOffset = computeSlideOffset(mSlideableView.getTop());
if (mSlideOffset == 1) {
if (mSlideState != SlideState.EXPANDED) {
updateObscuredViewVisibility();
mSlideState = SlideState.EXPANDED;
dispatchOnPanelExpanded(mSlideableView);
}
} else if (mSlideOffset == 0) {
if (mSlideState != SlideState.COLLAPSED) {
mSlideState = SlideState.COLLAPSED;
dispatchOnPanelCollapsed(mSlideableView);
}
} else if (mSlideOffset < 0) {
mSlideState = SlideState.HIDDEN;
mSlideableView.setVisibility(View.GONE);
dispatchOnPanelHidden(mSlideableView);
}
}
}
@Override
public void onViewCaptured(View capturedChild, int activePointerId) {
setAllChildrenVisible();
}
@Override
public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
onPanelDragged(top);
invalidate();
}
@Override
public void onViewReleased(View releasedChild, float xvel, float yvel) {
int target = 0;
// direction is always positive if we are sliding in the expanded direction
float direction = mIsSlidingUp ? -yvel : yvel;
if (direction > 0) {
// swipe up -> expand
target = computePanelTopPosition(1.0f);
} else if (direction < 0) {
// swipe down -> collapse
target = computePanelTopPosition(0.0f);
} else if (mAnchorPoint != 1 && mSlideOffset >= (1.f + mAnchorPoint) / 2) {
// zero velocity, and far enough from anchor point => expand to the top
target = computePanelTopPosition(1.0f);
} else if (mAnchorPoint == 1 && mSlideOffset >= 0.5f) {
// zero velocity, and far enough from anchor point => expand to the top
target = computePanelTopPosition(1.0f);
} else if (mAnchorPoint != 1 && mSlideOffset >= mAnchorPoint) {
target = computePanelTopPosition(mAnchorPoint);
} else if (mAnchorPoint != 1 && mSlideOffset >= mAnchorPoint / 2) {
target = computePanelTopPosition(mAnchorPoint);
} else {
// settle at the bottom
target = computePanelTopPosition(0.0f);
}
mDragHelper.settleCapturedViewAt(releasedChild.getLeft(), target);
invalidate();
}
@Override
public int getViewVerticalDragRange(View child) {
return mSlideRange;
}
@Override
public int clampViewPositionVertical(View child, int top, int dy) {
final int collapsedTop = computePanelTopPosition(0.f);
final int expandedTop = computePanelTopPosition(1.0f);
if (mIsSlidingUp) {
return Math.min(Math.max(top, expandedTop), collapsedTop);
} else {
return Math.min(Math.max(top, collapsedTop), expandedTop);
}
}
}
public static class LayoutParams extends ViewGroup.MarginLayoutParams {
private static final int[] ATTRS = new int[] {
android.R.attr.layout_weight
};
public LayoutParams() {
super(MATCH_PARENT, MATCH_PARENT);
}
public LayoutParams(int width, int height) {
super(width, height);
}
public LayoutParams(android.view.ViewGroup.LayoutParams source) {
super(source);
}
public LayoutParams(MarginLayoutParams source) {
super(source);
}
public LayoutParams(LayoutParams source) {
super(source);
}
public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
final TypedArray a = c.obtainStyledAttributes(attrs, ATTRS);
a.recycle();
}
}
static class SavedState extends BaseSavedState {
SlideState mSlideState;
SavedState(Parcelable superState) {
super(superState);
}
private SavedState(Parcel in) {
super(in);
try {
mSlideState = Enum.valueOf(SlideState.class, in.readString());
} catch (IllegalArgumentException e) {
mSlideState = SlideState.COLLAPSED;
}
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeString(mSlideState.toString());
}
public static final Parcelable.Creator<SavedState> CREATOR =
new Parcelable.Creator<SavedState>() {
@Override
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
@Override
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
}
MyActivity.java
package com.mrbug.pulltodismisspager.example;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import com.mrbug.pulltodismisspager.PullToDismissPager;
public class MyActivity extends Activity {
private PullToDismissPager pull_to_dismiss_pager;
private PagerAdapter pagerAdapter;
private Button button;
String[] imgs={"http://c.hiphotos.baidu.com/image/pic/item/0dd7912397dda1449fad6f63b6b7d0a20df486be.jpg",
"http://h.hiphotos.baidu.com/image/pic/item/b219ebc4b74543a9bd0374211a178a82b80114c6.jpg",
"http://d.hiphotos.baidu.com/image/pic/item/71cf3bc79f3df8dcd227017cc911728b461028c0.jpg",
"http://d.hiphotos.baidu.com/image/pic/item/2fdda3cc7cd98d10ba9982dc253fb80e7aec908a.jpg",
"http://g.hiphotos.baidu.com/image/pic/item/0b55b319ebc4b7457d3839fbcbfc1e178b8215aa.jpg",
"http://b.hiphotos.baidu.com/image/pic/item/d009b3de9c82d15825ffd75c840a19d8bd3e42da.jpg"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
button =(Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
pull_to_dismiss_pager.expandPanel();
}
});
pull_to_dismiss_pager = (PullToDismissPager) findViewById(R.id.pull_to_dismiss_pager);
pagerAdapter = new SlidingPagerAdapter(this);
pull_to_dismiss_pager.setPagerAdapter(pagerAdapter);
}
@Override
public void onBackPressed() {
if(pull_to_dismiss_pager.isPanelExpanded())
pull_to_dismiss_pager.collapsePanel();
else
super.onBackPressed();
}
private class SlidingPagerAdapter extends PagerAdapter{
private LayoutInflater mInflater;
private Context mcontext;
public SlidingPagerAdapter(Context context){
mInflater = LayoutInflater.from(context);
mcontext=context;
}
@Override
public int getCount() {
return imgs.length;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
View view = mInflater.inflate(R.layout.pager_item, null, false);
TextView item =(TextView) view.findViewById(R.id.item1);
ImageView img =(ImageView) view.findViewById(R.id.img);
Glide.with(mcontext).load(imgs[position]).into(img);
item.setText(position+"");
container.addView(view);
return view;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((FrameLayout)object);
}
}
}
demo如下，