（安卓特效） 炫酷的抽屉效果 3D侧拉
程序员文章站
2022-05-26 19:43:14
...
自己写一个类：
ResideLayout
package pingan.com.day_ceshi0105;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffColorFilter;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.annotation.DrawableRes;
import android.support.v4.view.AccessibilityDelegateCompat;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewCompat;
import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
import android.support.v4.widget.ViewDragHelper;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.view.accessibility.AccessibilityEvent;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
public class ResideLayout extends ViewGroup {
private static final String TAG = "ResideLayout";
/**
* Default size of the overhang for a pane in the open state.
* At least this much of a sliding pane will remain visible.
* This indicates that there is more content available and provides
* a "physical" edge to grab to pull it closed.
*/
private static final int DEFAULT_OVERHANG_SIZE = 120; // dp;
/**
* If no fade color is given by default it will fade to 80% gray.
*/
private static final int DEFAULT_FADE_COLOR = 0x00000000;
public static final int INT = 828;
/**
* The fade color used for the sliding panel. 0 = no fading.
*/
private int mSliderFadeColor = DEFAULT_FADE_COLOR;
/**
* Minimum velocity that will be detected as a fling
*/
private static final int MIN_FLING_VELOCITY = 400; // dips per second
/**
* The fade color used for the panel covered by the slider. 0 = no fading.
*/
private int mCoveredFadeColor;
/**
* Drawable used to draw the shadow between panes by default.
*/
private Drawable mShadowDrawableLeft;
/**
* Drawable used to draw the shadow between panes to support RTL (right to left language).
*/
private Drawable mShadowDrawableRight;
/**
* The size of the overhang in pixels.
* This is the minimum section of the sliding panel that will
* be visible in the open state to allow for a closing drag.
*/
private final int mOverhangSize;
/**
* True if a panel can slide with the current measurements
*/
private boolean mCanSlide;
/**
* The child view that can slide, if any.
*/
private View mSlideableView;
/**
* How far the panel is offset from its closed position.
* range [0, 1] where 0 = closed, 1 = open.
*/
private float mSlideOffset;
/**
* How far the non-sliding panel is parallaxed from its usual position when open.
* range [0, 1]
*/
private float mParallaxOffset;
/**
* 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;
/**
* Distance in pixels to parallax the fixed pane by when fully closed
*/
private int mParallaxBy;
private float mInitialMotionX;
private float mInitialMotionY;
private PanelSlideListener mPanelSlideListener;
private final ViewDragHelper mDragHelper;
/**
* Stores whether or not the pane was open the last time it was slideable.
* If open/close operations are invoked this state is modified. Used by
* instance state save/restore.
*/
private boolean mPreservedOpenState;
private boolean mFirstLayout = true;
private final Rect mTmpRect = new Rect();
private final ArrayList<DisableLayerRunnable> mPostedRunnables =
new ArrayList<DisableLayerRunnable>();
static final SlidingPanelLayoutImpl IMPL;
static {
final int deviceVersion = Build.VERSION.SDK_INT;
if (deviceVersion >= 17) {
IMPL = new SlidingPanelLayoutImplJBMR1();
} else if (deviceVersion >= 16) {
IMPL = new SlidingPanelLayoutImplJB();
} else {
IMPL = new SlidingPanelLayoutImplBase();
}
}
/**
* 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 pane becomes slid completely open. The pane may or may not
* be interactive at this point depending on how much of the pane is visible.
*
* @param panel The child view that was slid to an open position, revealing other panes
*/
public void onPanelOpened(View panel);
/**
* Called when a sliding pane becomes slid completely closed. The pane is now guaranteed
* to be interactive. It may now obscure other views in the layout.
*
* @param panel The child view that was slid to a closed position
*/
public void onPanelClosed(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 onPanelOpened(View panel) {
}
@Override
public void onPanelClosed(View panel) {
}
}
public ResideLayout(Context context) {
this(context, null);
}
public ResideLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ResideLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
final float density = context.getResources().getDisplayMetrics().density;
mOverhangSize = (int) (DEFAULT_OVERHANG_SIZE * density + 0.5f);
final ViewConfiguration viewConfig = ViewConfiguration.get(context);
setWillNotDraw(false);
ViewCompat.setAccessibilityDelegate(this, new AccessibilityDelegate());
ViewCompat.setImportantForAccessibility(this, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES);
mDragHelper = ViewDragHelper.create(this, 0.5f, new DragHelperCallback());
mDragHelper.setMinVelocity(MIN_FLING_VELOCITY * density);
}
/**
* Set a distance to parallax the lower pane by when the upper pane is in its
* fully closed state. The lower pane will scroll between this position and
* its fully open state.
*
* @param parallaxBy Distance to parallax by in pixels
*/
public void setParallaxDistance(int parallaxBy) {
mParallaxBy = parallaxBy;
requestLayout();
}
/**
* @return The distance the lower pane will parallax by when the upper pane is fully closed.
* @see #setParallaxDistance(int)
*/
public int getParallaxDistance() {
return mParallaxBy;
}
/**
* Set the color used to fade the sliding pane out when it is slid most of the way offscreen.
*
* @param color An ARGB-packed color value
*/
public void setSliderFadeColor(int color) {
mSliderFadeColor = color;
}
/**
* @return The ARGB-packed color value used to fade the sliding pane
*/
public int getSliderFadeColor() {
return mSliderFadeColor;
}
/**
* Set the color used to fade the pane covered by the sliding pane out when the pane
* will become fully covered in the closed state.
*
* @param color An ARGB-packed color value
*/
public void setCoveredFadeColor(int color) {
mCoveredFadeColor = color;
}
/**
* @return The ARGB-packed color value used to fade the fixed pane
*/
public int getCoveredFadeColor() {
return mCoveredFadeColor;
}
public void setPanelSlideListener(PanelSlideListener listener) {
mPanelSlideListener = listener;
}
void dispatchOnPanelSlide(View panel) {
if (mPanelSlideListener != null) {
mPanelSlideListener.onPanelSlide(panel, mSlideOffset);
}
}
void dispatchOnPanelOpened(View panel) {
if (mPanelSlideListener != null) {
mPanelSlideListener.onPanelOpened(panel);
}
sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
}
void dispatchOnPanelClosed(View panel) {
if (mPanelSlideListener != null) {
mPanelSlideListener.onPanelClosed(panel);
}
sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
}
void updateObscuredViewsVisibility(View panel) {
for (int i = 0, childCount = getChildCount(); i < childCount; i++) {
final View child = getChildAt(i);
if (child == panel) {
// There are still more children above the panel but they won't be affected.
break;
}
child.setVisibility(INVISIBLE);
}
}
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 viewIsOpaque(View v) {
if (ViewCompat.isOpaque(v)) return true;
// View#isOpaque didn't take all valid opaque scrollbar modes into account
// before API 18 (JB-MR2). On newer devices rely solely on isOpaque above and return false
// here. On older devices, check the view's background drawable directly as a fallback.
if (Build.VERSION.SDK_INT >= 18) return false;
final Drawable bg = v.getBackground();
if (bg != null) {
return bg.getOpacity() == PixelFormat.OPAQUE;
}
return false;
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
mFirstLayout = true;
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mFirstLayout = true;
for (int i = 0, count = mPostedRunnables.size(); i < count; i++) {
final DisableLayerRunnable dlr = mPostedRunnables.get(i);
dlr.run();
}
mPostedRunnables.clear();
}
@SuppressLint("Range")
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
if (widthMode != MeasureSpec.EXACTLY) {
if (isInEditMode()) {
// Don't crash the layout editor. Consume all of the space if specified
// or pick a magic number from thin air otherwise.
// TODO Better communication with tools of this bogus state.
// It will crash on a real device.
if (widthMode == MeasureSpec.AT_MOST) {
widthMode = MeasureSpec.EXACTLY;
} else if (widthMode == MeasureSpec.UNSPECIFIED) {
widthMode = MeasureSpec.EXACTLY;
widthSize = 300;
}
} else {
throw new IllegalStateException("Width must have an exact value or MATCH_PARENT");
}
} else if (heightMode == MeasureSpec.UNSPECIFIED) {
if (isInEditMode()) {
// Don't crash the layout editor. Pick a magic number from thin air instead.
// TODO Better communication with tools of this bogus state.
// It will crash on a real device.
if (heightMode == MeasureSpec.UNSPECIFIED) {
heightMode = MeasureSpec.AT_MOST;
heightSize = 300;
}
} else {
throw new IllegalStateException("Height must not be UNSPECIFIED");
}
}
int layoutHeight = 0;
int maxLayoutHeight = -1;
switch (heightMode) {
case MeasureSpec.EXACTLY:
layoutHeight = maxLayoutHeight = heightSize - getPaddingTop() - getPaddingBottom();
break;
case MeasureSpec.AT_MOST:
maxLayoutHeight = heightSize - getPaddingTop() - getPaddingBottom();
break;
}
float weightSum = 0;
boolean canSlide = false;
final int widthAvailable = widthSize - getPaddingLeft() - getPaddingRight();
int widthRemaining = widthAvailable;
final int childCount = getChildCount();
if (childCount > 2) {
Log.e(TAG, "onMeasure: More than two child views are not supported.");
}
// We'll find the current one below.
mSlideableView = null;
// First pass. Measure based on child LayoutParams width/height.
// Weight will incur a second pass.
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (child.getVisibility() == GONE) {
lp.dimWhenOffset = false;
continue;
}
if (lp.weight > 0) {
weightSum += lp.weight;
// If we have no width, weight is the only contributor to the final size.
// Measure this view on the weight pass only.
if (lp.width == 0) continue;
}
int childWidthSpec;
final int horizontalMargin = lp.leftMargin + lp.rightMargin;
if (lp.width == LayoutParams.WRAP_CONTENT) {
childWidthSpec = MeasureSpec.makeMeasureSpec(widthAvailable - horizontalMargin,
MeasureSpec.AT_MOST);
} else if (lp.width == LayoutParams.FILL_PARENT) {
childWidthSpec = MeasureSpec.makeMeasureSpec(widthAvailable - horizontalMargin,
MeasureSpec.EXACTLY);
} else {
childWidthSpec = MeasureSpec.makeMeasureSpec(lp.width, MeasureSpec.EXACTLY);
}
int childHeightSpec;
if (lp.height == LayoutParams.WRAP_CONTENT) {
childHeightSpec = MeasureSpec.makeMeasureSpec(maxLayoutHeight, MeasureSpec.AT_MOST);
} else if (lp.height == LayoutParams.FILL_PARENT) {
childHeightSpec = MeasureSpec.makeMeasureSpec(maxLayoutHeight, MeasureSpec.EXACTLY);
} else {
childHeightSpec = MeasureSpec.makeMeasureSpec(lp.height, MeasureSpec.EXACTLY);
}
child.measure(childWidthSpec, childHeightSpec);
final int childWidth = child.getMeasuredWidth();
final int childHeight = child.getMeasuredHeight();
if (heightMode == MeasureSpec.AT_MOST && childHeight > layoutHeight) {
layoutHeight = Math.min(childHeight, maxLayoutHeight);
}
widthRemaining -= childWidth;
canSlide |= lp.slideable = widthRemaining < 0;
if (lp.slideable) {
mSlideableView = child;
}
}
// Resolve weight and make sure non-sliding panels are smaller than the full screen.
if (canSlide || weightSum > 0) {
final int fixedPanelWidthLimit = widthAvailable;
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == GONE) {
continue;
}
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (child.getVisibility() == GONE) {
continue;
}
final boolean skippedFirstPass = lp.width == 0 && lp.weight > 0;
final int measuredWidth = skippedFirstPass ? 0 : child.getMeasuredWidth();
if (canSlide && child != mSlideableView) {
if (lp.width < 0 && (measuredWidth > fixedPanelWidthLimit || lp.weight > 0)) {
// Fixed panels in a sliding configuration should
// be clamped to the fixed panel limit.
final int childHeightSpec;
if (skippedFirstPass) {
// Do initial height measurement if we skipped measuring this view
// the first time around.
if (lp.height == LayoutParams.WRAP_CONTENT) {
childHeightSpec = MeasureSpec.makeMeasureSpec(maxLayoutHeight,
MeasureSpec.AT_MOST);
} else if (lp.height == LayoutParams.FILL_PARENT) {
childHeightSpec = MeasureSpec.makeMeasureSpec(maxLayoutHeight,
MeasureSpec.EXACTLY);
} else {
childHeightSpec = MeasureSpec.makeMeasureSpec(lp.height,
MeasureSpec.EXACTLY);
}
} else {
childHeightSpec = MeasureSpec.makeMeasureSpec(
child.getMeasuredHeight(), MeasureSpec.EXACTLY);
}
final int childWidthSpec = MeasureSpec.makeMeasureSpec(
fixedPanelWidthLimit, MeasureSpec.EXACTLY);
child.measure(childWidthSpec, childHeightSpec);
}
} else if (lp.weight > 0) {
int childHeightSpec;
if (lp.width == 0) {
// This was skipped the first time; figure out a real height spec.
if (lp.height == LayoutParams.WRAP_CONTENT) {
childHeightSpec = MeasureSpec.makeMeasureSpec(maxLayoutHeight,
MeasureSpec.AT_MOST);
} else if (lp.height == LayoutParams.FILL_PARENT) {
childHeightSpec = MeasureSpec.makeMeasureSpec(maxLayoutHeight,
MeasureSpec.EXACTLY);
} else {
childHeightSpec = MeasureSpec.makeMeasureSpec(lp.height,
MeasureSpec.EXACTLY);
}
} else {
childHeightSpec = MeasureSpec.makeMeasureSpec(
child.getMeasuredHeight(), MeasureSpec.EXACTLY);
}
if (canSlide) {
// Consume available space
final int horizontalMargin = lp.leftMargin + lp.rightMargin;
final int newWidth = widthAvailable - horizontalMargin;
final int childWidthSpec = MeasureSpec.makeMeasureSpec(
newWidth, MeasureSpec.EXACTLY);
if (measuredWidth != newWidth) {
child.measure(childWidthSpec, childHeightSpec);
}
} else {
// Distribute the extra width proportionally similar to LinearLayout
final int widthToDistribute = Math.max(0, widthRemaining);
final int addedWidth = (int) (lp.weight * widthToDistribute / weightSum);
final int childWidthSpec = MeasureSpec.makeMeasureSpec(
measuredWidth + addedWidth, MeasureSpec.EXACTLY);
child.measure(childWidthSpec, childHeightSpec);
}
}
}
}
final int measuredWidth = widthSize;
final int measuredHeight = layoutHeight + getPaddingTop() + getPaddingBottom();
setMeasuredDimension(measuredWidth, measuredHeight);
mCanSlide = canSlide;
if (mDragHelper.getViewDragState() != ViewDragHelper.STATE_IDLE && !canSlide) {
// Cancel scrolling in progress, it's no longer relevant.
mDragHelper.abort();
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
mDragHelper.setEdgeTrackingEnabled(ViewDragHelper.EDGE_LEFT);
final int width = r - l;
final int paddingStart = getPaddingLeft();
final int paddingEnd = getPaddingRight();
final int paddingTop = getPaddingTop();
final int childCount = getChildCount();
int xStart = paddingStart;
int nextXStart = xStart;
if (mFirstLayout) {
mSlideOffset = mCanSlide && mPreservedOpenState ? 1.f : 0.f;
}
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == GONE) {
continue;
}
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
final int childWidth = child.getMeasuredWidth();
int offset = 0;
if (lp.slideable) {
final int margin = lp.leftMargin + lp.rightMargin;
final int range = Math.min(nextXStart,
width - paddingEnd - mOverhangSize) - xStart - margin;
mSlideRange = range;
final int lpMargin = lp.leftMargin;
lp.dimWhenOffset = xStart + lpMargin + range + childWidth / 2 >
width - paddingEnd;
final int pos = (int) (range * mSlideOffset);
xStart += pos + lpMargin;
mSlideOffset = (float) pos / mSlideRange;
} else if (mCanSlide && mParallaxBy != 0) {
offset = (int) ((1 - mSlideOffset) * mParallaxBy);
xStart = nextXStart;
} else {
xStart = nextXStart;
}
final int childRight;
final int childLeft;
childLeft = xStart - offset;
childRight = childLeft + childWidth;
final int childTop = paddingTop;
final int childBottom = childTop + child.getMeasuredHeight();
child.layout(childLeft, paddingTop, childRight, childBottom);
nextXStart += child.getWidth();
}
if (mFirstLayout) {
if (mCanSlide) {
if (mParallaxBy != 0) {
parallaxOtherViews(mSlideOffset);
}
if (((LayoutParams) mSlideableView.getLayoutParams()).dimWhenOffset) {
dimChildView(mSlideableView, mSlideOffset, mSliderFadeColor);
}
} else {
// Reset the dim level of all children; it's irrelevant when nothing moves.
for (int i = 0; i < childCount; i++) {
dimChildView(getChildAt(i), 0, mSliderFadeColor);
}
}
updateObscuredViewsVisibility(mSlideableView);
}
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 (w != oldw) {
mFirstLayout = true;
}
}
@Override
public void requestChildFocus(View child, View focused) {
super.requestChildFocus(child, focused);
if (!isInTouchMode() && !mCanSlide) {
mPreservedOpenState = child == mSlideableView;
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
final int action = MotionEventCompat.getActionMasked(ev);
// Preserve the open state based on the last view that was touched.
if (!mCanSlide && action == MotionEvent.ACTION_DOWN && getChildCount() > 1) {
// After the first things will be slideable.
final View secondChild = getChildAt(1);
if (secondChild != null) {
mPreservedOpenState = !mDragHelper.isViewUnder(secondChild,
(int) ev.getX(), (int) ev.getY());
}
}
if (!mCanSlide || (mIsUnableToDrag && action != MotionEvent.ACTION_DOWN)) {
mDragHelper.cancel();
return super.onInterceptTouchEvent(ev);
}
if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
mDragHelper.cancel();
return false;
}
boolean interceptTap = false;
switch (action) {
case MotionEvent.ACTION_DOWN: {
mIsUnableToDrag = false;
final float x = ev.getX();
final float y = ev.getY();
mInitialMotionX = x;
mInitialMotionY = y;
if (mDragHelper.isViewUnder(mSlideableView, (int) x, (int) y) &&
isDimmed(mSlideableView)) {
interceptTap = true;
}
break;
}
case MotionEvent.ACTION_MOVE: {
final float x = ev.getX();
final float y = ev.getY();
final float adx = Math.abs(x - mInitialMotionX);
final float ady = Math.abs(y - mInitialMotionY);
final int slop = mDragHelper.getTouchSlop();
if (adx > slop && ady > adx) {
mDragHelper.cancel();
mIsUnableToDrag = true;
return false;
}
}
}
final boolean interceptForDrag = mDragHelper.shouldInterceptTouchEvent(ev);
return interceptForDrag || interceptTap;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (!mCanSlide) {
return super.onTouchEvent(ev);
}
mDragHelper.processTouchEvent(ev);
final int action = ev.getAction();
boolean wantTouchEvents = true;
switch (action & MotionEventCompat.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: {
final float x = ev.getX();
final float y = ev.getY();
mInitialMotionX = x;
mInitialMotionY = y;
break;
}
case MotionEvent.ACTION_UP: {
if (isDimmed(mSlideableView)) {
final float x = ev.getX();
final float y = ev.getY();
final float dx = x - mInitialMotionX;
final float dy = y - mInitialMotionY;
final int slop = mDragHelper.getTouchSlop();
if (dx * dx + dy * dy < slop * slop &&
mDragHelper.isViewUnder(mSlideableView, (int) x, (int) y)) {
// Taps close a dimmed open pane.
closePane(mSlideableView, 0);
break;
}
}
break;
}
}
return wantTouchEvents;
}
private boolean closePane(View pane, int initialVelocity) {
if (mFirstLayout || smoothSlideTo(0.f, initialVelocity)) {
mPreservedOpenState = false;
return true;
}
return false;
}
private boolean openPane(View pane, int initialVelocity) {
if (mFirstLayout || smoothSlideTo(1.f, initialVelocity)) {
mPreservedOpenState = true;
return true;
}
return false;
}
/**
* @deprecated Renamed to {@link #openPane()} - this method is going away soon!
*/
@Deprecated
public void smoothSlideOpen() {
openPane();
}
/**
* Open 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 open/in the process of opening
*/
public boolean openPane() {
return openPane(mSlideableView, 0);
}
/**
* @deprecated Renamed to {@link #closePane()} - this method is going away soon!
*/
@Deprecated
public void smoothSlideClosed() {
closePane();
}
/**
* Close 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 closed/in the process of closing
*/
public boolean closePane() {
return closePane(mSlideableView, 0);
}
/**
* Check if the layout is completely open. It can be open either because the slider
* itself is open revealing the left pane, or if all content fits without sliding.
*
* @return true if sliding panels are completely open
*/
public boolean isOpen() {
return !mCanSlide || mSlideOffset == 1;
}
/**
* @return true if content in this layout can be slid open and closed
* @deprecated Renamed to {@link #isSlideable()} - this method is going away soon!
*/
@Deprecated
public boolean canSlide() {
return mCanSlide;
}
/**
* Check if the content in this layout cannot fully fit side by side and therefore
* the content pane can be slid back and forth.
*
* @return true if content in this layout can be slid open and closed
*/
public boolean isSlideable() {
return mCanSlide;
}
private void onPanelDragged(int newLeft) {
if (mSlideableView == null) {
// This can happen if we're aborting motion during layout because everything now fits.
mSlideOffset = 0;
return;
}
final LayoutParams lp = (LayoutParams) mSlideableView.getLayoutParams();
int childWidth = mSlideableView.getWidth();
final int newStart = newLeft;
final int paddingStart = getPaddingLeft();
final int lpMargin = lp.leftMargin;
final int startBound = paddingStart + lpMargin;
mSlideOffset = (float) (newStart - startBound) / mSlideRange;
if (mParallaxBy != 0) {
parallaxOtherViews(mSlideOffset);
}
if (lp.dimWhenOffset) {
dimChildView(mSlideableView, mSlideOffset, mSliderFadeColor);
}
dispatchOnPanelSlide(mSlideableView);
}
private void dimChildView(View v, float mag, int fadeColor) {
final LayoutParams lp = (LayoutParams) v.getLayoutParams();
if (mag > 0 && fadeColor != 0) {
final int baseAlpha = (fadeColor & 0xff000000) >>> 24;
int imag = (int) (baseAlpha * mag);
int color = imag << 24 | (fadeColor & 0xffffff);
if (lp.dimPaint == null) {
lp.dimPaint = new Paint();
}
lp.dimPaint.setColorFilter(new PorterDuffColorFilter(color, PorterDuff.Mode.SRC_OVER));
if (ViewCompat.getLayerType(v) != ViewCompat.LAYER_TYPE_HARDWARE) {
ViewCompat.setLayerType(v, ViewCompat.LAYER_TYPE_HARDWARE, lp.dimPaint);
}
invalidateChildRegion(v);
} else if (ViewCompat.getLayerType(v) != ViewCompat.LAYER_TYPE_NONE) {
if (lp.dimPaint != null) {
lp.dimPaint.setColorFilter(null);
}
final DisableLayerRunnable dlr = new DisableLayerRunnable(v);
mPostedRunnables.add(dlr);
ViewCompat.postOnAnimation(this, dlr);
}
}
@Override
protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
boolean result;
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
final int save = canvas.save(Canvas.ALL_SAVE_FLAG);
if (mCanSlide && !lp.slideable && mSlideableView != null) {
canvas.scale(1.5f - 0.5f * mSlideOffset, 1.5f - 0.5f * mSlideOffset, child.getRight(), getHeight() / 2);
} else {
canvas.scale(1 - mSlideOffset / 5, 1 - mSlideOffset / 5, mSlideableView.getLeft(), getHeight() / 2);
ViewCompat.setRotationY(child, -10 * mSlideOffset);
}
result = super.drawChild(canvas, child, drawingTime);
canvas.restoreToCount(save);
return result;
}
private void invalidateChildRegion(View v) {
IMPL.invalidateChildRegion(this, v);
}
/**
* 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 (!mCanSlide) {
// Nothing to do.
return false;
}
final LayoutParams lp = (LayoutParams) mSlideableView.getLayoutParams();
int x;
int startBound = getPaddingLeft() + lp.leftMargin;
x = (int) (startBound + slideOffset * mSlideRange);
if (mDragHelper.smoothSlideViewTo(mSlideableView, x, mSlideableView.getTop())) {
setAllChildrenVisible();
ViewCompat.postInvalidateOnAnimation(this);
return true;
}
return false;
}
@Override
public void computeScroll() {
if (mDragHelper.continueSettling(true)) {
if (!mCanSlide) {
mDragHelper.abort();
return;
}
ViewCompat.postInvalidateOnAnimation(this);
}
}
/**
* @param d drawable to use as a shadow
* @deprecated Renamed to {@link #setShadowDrawableLeft(Drawable d)} to support LTR (left to
* right language) and {@link #setShadowDrawableRight(Drawable d)} to support RTL (right to left
* language) during opening/closing.
*/
@Deprecated
public void setShadowDrawable(Drawable d) {
setShadowDrawableLeft(d);
}
/**
* Set a drawable to use as a shadow cast by the right pane onto the left pane
* during opening/closing.
*
* @param d drawable to use as a shadow
*/
public void setShadowDrawableLeft(Drawable d) {
mShadowDrawableLeft = d;
}
/**
* Set a drawable to use as a shadow cast by the left pane onto the right pane
* during opening/closing to support right to left language.
*
* @param d drawable to use as a shadow
*/
public void setShadowDrawableRight(Drawable d) {
mShadowDrawableRight = d;
}
/**
* Set a drawable to use as a shadow cast by the right pane onto the left pane
* during opening/closing.
*
* @param resId Resource ID of a drawable to use
*/
@Deprecated
public void setShadowResource(@DrawableRes int resId) {
setShadowDrawable(getResources().getDrawable(resId));
}
/**
* Set a drawable to use as a shadow cast by the right pane onto the left pane
* during opening/closing.
*
* @param resId Resource ID of a drawable to use
*/
public void setShadowResourceLeft(int resId) {
setShadowDrawableLeft(getResources().getDrawable(resId));
}
/**
* Set a drawable to use as a shadow cast by the left pane onto the right pane
* during opening/closing to support right to left language.
*
* @param resId Resource ID of a drawable to use
*/
public void setShadowResourceRight(int resId) {
setShadowDrawableRight(getResources().getDrawable(resId));
}
@Override
public void draw(Canvas c) {
super.draw(c);
Drawable shadowDrawable;
shadowDrawable = mShadowDrawableLeft;
final View shadowView = getChildCount() > 1 ? getChildAt(1) : null;
if (shadowView == null || shadowDrawable == null) {
// No need to draw a shadow if we don't have one.
return;
}
final int top = shadowView.getTop();
final int bottom = shadowView.getBottom();
final int shadowWidth = shadowDrawable.getIntrinsicWidth();
final int left;
final int right;
right = shadowView.getLeft();
left = right - shadowWidth;
shadowDrawable.setBounds(left, top, right, bottom);
shadowDrawable.draw(c);
}
private void parallaxOtherViews(float slideOffset) {
final LayoutParams slideLp = (LayoutParams) mSlideableView.getLayoutParams();
final boolean dimViews = slideLp.dimWhenOffset &&
(slideLp.leftMargin) <= 0;
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
final View v = getChildAt(i);
if (v == mSlideableView) continue;
final int oldOffset = (int) ((1 - mParallaxOffset) * mParallaxBy);
mParallaxOffset = slideOffset;
final int newOffset = (int) ((1 - slideOffset) * mParallaxBy);
final int dx = oldOffset - newOffset;
v.offsetLeftAndRight(dx);
if (dimViews) {
dimChildView(v,
1 - mParallaxOffset, mCoveredFadeColor);
}
}
}
/**
* Tests scrollability within child views of v given a delta of dx.
*
* @param v View to test for horizontal scrollability
* @param checkV Whether the view v passed should itself be checked for scrollability (true),
* or just its children (false).
* @param dx Delta scrolled in pixels
* @param x X coordinate of the active touch point
* @param y Y coordinate of the active touch point
* @return true if child views of v can be scrolled by delta of dx.
*/
protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
if (v instanceof ViewGroup) {
final ViewGroup group = (ViewGroup) v;
final int scrollX = v.getScrollX();
final int scrollY = v.getScrollY();
final int count = group.getChildCount();
// Count backwards - let topmost views consume scroll distance first.
for (int i = count - 1; i >= 0; i--) {
// TODO: Add versioned support here for transformed views.
// This will not work for transformed views in Honeycomb+
final View child = group.getChildAt(i);
if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight() &&
y + scrollY >= child.getTop() && y + scrollY < child.getBottom() &&
canScroll(child, true, dx, x + scrollX - child.getLeft(),
y + scrollY - child.getTop())) {
return true;
}
}
}
return checkV && ViewCompat.canScrollHorizontally(v, (-dx));
}
boolean isDimmed(View child) {
if (child == null) {
return false;
}
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
return mCanSlide && lp.dimWhenOffset && mSlideOffset > 0;
}
@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
protected Parcelable onSaveInstanceState() {
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);
ss.isOpen = isSlideable() ? isOpen() : mPreservedOpenState;
return ss;
}
@Override
protected void onRestoreInstanceState(Parcelable state) {
SavedState ss = (SavedState) state;
super.onRestoreInstanceState(ss.getSuperState());
if (ss.isOpen) {
openPane();
} else {
closePane();
}
mPreservedOpenState = ss.isOpen;
}
private class DragHelperCallback extends ViewDragHelper.Callback {
@Override
public boolean tryCaptureView(View child, int pointerId) {
if (mIsUnableToDrag) {
return false;
}
return ((LayoutParams) child.getLayoutParams()).slideable;
}
@Override
public void onViewDragStateChanged(int state) {
if (mDragHelper.getViewDragState() == ViewDragHelper.STATE_IDLE) {
if (mSlideOffset == 0) {
updateObscuredViewsVisibility(mSlideableView);
dispatchOnPanelClosed(mSlideableView);
mPreservedOpenState = false;
} else {
dispatchOnPanelOpened(mSlideableView);
mPreservedOpenState = true;
}
}
}
@Override
public void onViewCaptured(View capturedChild, int activePointerId) {
// Make all child views visible in preparation for sliding things around
setAllChildrenVisible();
}
@Override
public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
onPanelDragged(left);
invalidate();
}
@Override
public void onViewReleased(View releasedChild, float xvel, float yvel) {
final LayoutParams lp = (LayoutParams) releasedChild.getLayoutParams();
int left;
left = getPaddingLeft() + lp.leftMargin;
if (xvel > 0 || (xvel == 0 && mSlideOffset > 0.5f)) {
left += mSlideRange;
}
mDragHelper.settleCapturedViewAt(left, releasedChild.getTop());
invalidate();
}
@Override
public int getViewHorizontalDragRange(View child) {
return mSlideRange;
}
@Override
public int clampViewPositionHorizontal(View child, int left, int dx) {
final LayoutParams lp = (LayoutParams) mSlideableView.getLayoutParams();
final int newLeft;
int startBound = getPaddingLeft() + lp.leftMargin;
int endBound = startBound + mSlideRange;
newLeft = Math.min(Math.max(left, startBound), endBound);
return newLeft;
}
@Override
public int clampViewPositionVertical(View child, int top, int dy) {
// Make sure we never move views vertically.
// This could happen if the child has less height than its parent.
return child.getTop();
}
@Override
public void onEdgeDragStarted(int edgeFlags, int pointerId) {
mDragHelper.captureChildView(mSlideableView, pointerId);
}
}
public static class LayoutParams extends MarginLayoutParams {
private static final int[] ATTRS = new int[]{
android.R.attr.layout_weight
};
/**
* The weighted proportion of how much of the leftover space
* this child should consume after measurement.
*/
public float weight = 0;
/**
* True if this pane is the slideable pane in the layout.
*/
boolean slideable;
/**
* True if this view should be drawn dimmed
* when it's been offset from its default position.
*/
boolean dimWhenOffset;
Paint dimPaint;
public LayoutParams() {
super(FILL_PARENT, FILL_PARENT);
}
public LayoutParams(int width, int height) {
super(width, height);
}
public LayoutParams(ViewGroup.LayoutParams source) {
super(source);
}
public LayoutParams(MarginLayoutParams source) {
super(source);
}
public LayoutParams(LayoutParams source) {
super(source);
this.weight = source.weight;
}
public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
final TypedArray a = c.obtainStyledAttributes(attrs, ATTRS);
this.weight = a.getFloat(0, 0);
a.recycle();
}
}
static class SavedState extends BaseSavedState {
boolean isOpen;
SavedState(Parcelable superState) {
super(superState);
}
private SavedState(Parcel in) {
super(in);
isOpen = in.readInt() != 0;
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeInt(isOpen ? 1 : 0);
}
public static final Creator<SavedState> CREATOR =
new Creator<SavedState>() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
interface SlidingPanelLayoutImpl {
void invalidateChildRegion(ResideLayout parent, View child);
}
static class SlidingPanelLayoutImplBase implements SlidingPanelLayoutImpl {
public void invalidateChildRegion(ResideLayout parent, View child) {
ViewCompat.postInvalidateOnAnimation(parent, child.getLeft(), child.getTop(),
child.getRight(), child.getBottom());
}
}
static class SlidingPanelLayoutImplJB extends SlidingPanelLayoutImplBase {
/*
* Private API hacks! Nasty! Bad!
*
* In Jellybean, some optimizations in the hardware UI renderer
* prevent a changed Paint on a View using a hardware layer from having
* the intended effect. This twiddles some internal bits on the view to force
* it to recreate the display list.
*/
private Method mGetDisplayList;
private Field mRecreateDisplayList;
SlidingPanelLayoutImplJB() {
try {
mGetDisplayList = View.class.getDeclaredMethod("getDisplayList", (Class[]) null);
} catch (NoSuchMethodException e) {
Log.e(TAG, "Couldn't fetch getDisplayList method; dimming won't work right.", e);
}
try {
mRecreateDisplayList = View.class.getDeclaredField("mRecreateDisplayList");
mRecreateDisplayList.setAccessible(true);
} catch (NoSuchFieldException e) {
Log.e(TAG, "Couldn't fetch mRecreateDisplayList field; dimming will be slow.", e);
}
}
@Override
public void invalidateChildRegion(ResideLayout parent, View child) {
if (mGetDisplayList != null && mRecreateDisplayList != null) {
try {
mRecreateDisplayList.setBoolean(child, true);
mGetDisplayList.invoke(child, (Object[]) null);
} catch (Exception e) {
Log.e(TAG, "Error refreshing display list state", e);
}
} else {
// Slow path. REALLY slow path. Let's hope we don't get here.
child.invalidate();
return;
}
super.invalidateChildRegion(parent, child);
}
}
static class SlidingPanelLayoutImplJBMR1 extends SlidingPanelLayoutImplBase {
@Override
public void invalidateChildRegion(ResideLayout parent, View child) {
ViewCompat.setLayerPaint(child, ((LayoutParams) child.getLayoutParams()).dimPaint);
}
}
class AccessibilityDelegate extends AccessibilityDelegateCompat {
private final Rect mTmpRect = new Rect();
@Override
public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) {
final AccessibilityNodeInfoCompat superNode = AccessibilityNodeInfoCompat.obtain(info);
super.onInitializeAccessibilityNodeInfo(host, superNode);
copyNodeInfoNoChildren(info, superNode);
superNode.recycle();
info.setClassName(ResideLayout.class.getName());
info.setSource(host);
final ViewParent parent = ViewCompat.getParentForAccessibility(host);
if (parent instanceof View) {
info.setParent((View) parent);
}
// This is a best-approximation of addChildrenForAccessibility()
// that accounts for filtering.
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (!filter(child) && (child.getVisibility() == View.VISIBLE)) {
// Force importance to "yes" since we can't read the value.
ViewCompat.setImportantForAccessibility(
child, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES);
info.addChild(child);
}
}
}
@Override
public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(host, event);
event.setClassName(ResideLayout.class.getName());
}
@Override
public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child,
AccessibilityEvent event) {
if (!filter(child)) {
return super.onRequestSendAccessibilityEvent(host, child, event);
}
return false;
}
public boolean filter(View child) {
return isDimmed(child);
}
/**
* This should really be in AccessibilityNodeInfoCompat, but there unfortunately
* seem to be a few elements that are not easily cloneable using the underlying API.
* Leave it private here as it's not general-purpose useful.
*/
private void copyNodeInfoNoChildren(AccessibilityNodeInfoCompat dest,
AccessibilityNodeInfoCompat src) {
final Rect rect = mTmpRect;
src.getBoundsInParent(rect);
dest.setBoundsInParent(rect);
src.getBoundsInScreen(rect);
dest.setBoundsInScreen(rect);
dest.setVisibleToUser(src.isVisibleToUser());
dest.setPackageName(src.getPackageName());
dest.setClassName(src.getClassName());
dest.setContentDescription(src.getContentDescription());
dest.setEnabled(src.isEnabled());
dest.setClickable(src.isClickable());
dest.setFocusable(src.isFocusable());
dest.setFocused(src.isFocused());
dest.setAccessibilityFocused(src.isAccessibilityFocused());
dest.setSelected(src.isSelected());
dest.setLongClickable(src.isLongClickable());
dest.addAction(src.getActions());
dest.setMovementGranularities(src.getMovementGranularities());
}
}
private class DisableLayerRunnable implements Runnable {
final View mChildView;
DisableLayerRunnable(View childView) {
mChildView = childView;
}
@Override
public void run() {
if (mChildView.getParent() == ResideLayout.this) {
ViewCompat.setLayerType(mChildView, ViewCompat.LAYER_TYPE_NONE, null);
invalidateChildRegion(mChildView);
}
mPostedRunnables.remove(this);
}
}
}直接复制黏贴就好，然后在主xml中映入即可：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bg_blue"
tools:context="pingan.com.day_ceshi0105.MainActivity">
<pingan.com.day_ceshi0105.ResideLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bg_blue"
android:orientation="vertical"
>
<TextView
android:layout_marginTop="15dp"
android:layout_marginLeft="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="微一下"
/>
</LinearLayout>
</pingan.com.day_ceshi0105.ResideLayout>
<com.hjm.bottomtabbar.BottomTabBar
android:id="@+id/bottom_tab_bar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true">
</com.hjm.bottomtabbar.BottomTabBar>
</RelativeLayout>
可配合ViewPager+Fragment 来进行使用，就像上面的图一样，过几天我会把我做好的项目放进GitHub中 ，其中包括此效果 敬请期待
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