我已经实现了滑动抽屉并且工作正常。但是在打开和关闭时，我必须更改 button 图像。不知道从哪里改变以及如何改变。
代码是:
private final int mHandleId;
private final int mContentId;
private View mHandle;
private View mContent;
private boolean mInvert;
private boolean mVertical;
private boolean mExpanded;
private int mBottomOffset;
private int mTopOffset;
private int mHandleHeight;
private int mHandleWidth;
private OnDrawerOpenListener mOnDrawerOpenListener;
private OnDrawerCloseListener mOnDrawerCloseListener;
private OnDrawerScrollListener mOnDrawerScrollListener;
public static interface OnDrawerOpenListener {
public void onDrawerOpened();
}
public static interface OnDrawerCloseListener {
public void onDrawerClosed();
}
public static interface OnDrawerScrollListener {
public void onScrollStarted();
public void onScrollEnded();
}
public MultiDirectionSlidingDrawer( Context context, AttributeSet attrs )
{
this( context, attrs, 0 );
}
public MultiDirectionSlidingDrawer( Context context, AttributeSet attrs, int defStyle )
{
super( context, attrs, defStyle );
TypedArray a = context.obtainStyledAttributes( attrs, R.styleable.MultiDirectionSlidingDrawer, defStyle, 0 );
int orientation = a.getInt( R.styleable.MultiDirectionSlidingDrawer_direction, ORIENTATION_BTT );
mVertical = ( orientation == ORIENTATION_BTT || orientation == ORIENTATION_TTB );
mBottomOffset = (int)a.getDimension( R.styleable.MultiDirectionSlidingDrawer_bottomOffset, 0.0f );
mTopOffset = (int)a.getDimension( R.styleable.MultiDirectionSlidingDrawer_topOffset, 0.0f );
mAllowSingleTap = a.getBoolean( R.styleable.MultiDirectionSlidingDrawer_allowSingleTap, true );
mAnimateOnClick = a.getBoolean( R.styleable.MultiDirectionSlidingDrawer_animateOnClick, true );
mInvert = ( orientation == ORIENTATION_TTB || orientation == ORIENTATION_LTR );
int handleId = a.getResourceId( R.styleable.MultiDirectionSlidingDrawer_handle, 0 );
if ( handleId == 0 ) { throw new IllegalArgumentException( "The handle attribute is required and must refer "
+ "to a valid child." ); }
int contentId = a.getResourceId( R.styleable.MultiDirectionSlidingDrawer_content, 0 );
if ( contentId == 0 ) { throw new IllegalArgumentException( "The content attribute is required and must refer "
+ "to a valid child." ); }
if ( handleId == contentId ) { throw new IllegalArgumentException( "The content and handle attributes must refer "
+ "to different children." ); }
mHandleId = handleId;
mContentId = contentId;
final float density = getResources().getDisplayMetrics().density;
mTapThreshold = (int)( TAP_THRESHOLD * density + 0.5f );
mMaximumTapVelocity = (int)( MAXIMUM_TAP_VELOCITY * density + 0.5f );
mMaximumMinorVelocity = (int)( MAXIMUM_MINOR_VELOCITY * density + 0.5f );
mMaximumMajorVelocity = (int)( MAXIMUM_MAJOR_VELOCITY * density + 0.5f );
mMaximumAcceleration = (int)( MAXIMUM_ACCELERATION * density + 0.5f );
mVelocityUnits = (int)( VELOCITY_UNITS * density + 0.5f );
if( mInvert ) {
mMaximumAcceleration = -mMaximumAcceleration;
mMaximumMajorVelocity = -mMaximumMajorVelocity;
mMaximumMinorVelocity = -mMaximumMinorVelocity;
}
a.recycle();
setAlwaysDrawnWithCacheEnabled( false );
}
@Override
protected void onFinishInflate()
{
mHandle = findViewById( mHandleId );
if ( mHandle == null ) { throw new IllegalArgumentException( "The handle attribute is must refer to an" + " existing child." ); }
mHandle.setOnClickListener( new DrawerToggler() );
mContent = findViewById( mContentId );
if ( mContent == null ) { throw new IllegalArgumentException( "The content attribute is must refer to an"
+ " existing child." ); }
mContent.setVisibility( View.GONE );
}
@Override
protected void onMeasure( int widthMeasureSpec, int heightMeasureSpec )
{
int widthSpecMode = MeasureSpec.getMode( widthMeasureSpec );
int widthSpecSize = MeasureSpec.getSize( widthMeasureSpec );
int heightSpecMode = MeasureSpec.getMode( heightMeasureSpec );
int heightSpecSize = MeasureSpec.getSize( heightMeasureSpec );
if ( widthSpecMode == MeasureSpec.UNSPECIFIED || heightSpecMode == MeasureSpec.UNSPECIFIED ) { throw new RuntimeException(
"SlidingDrawer cannot have UNSPECIFIED dimensions" ); }
final View handle = mHandle;
measureChild( handle, widthMeasureSpec, heightMeasureSpec );
if ( mVertical ) {
int height = heightSpecSize - handle.getMeasuredHeight() - mTopOffset;
mContent.measure( MeasureSpec.makeMeasureSpec( widthSpecSize, MeasureSpec.EXACTLY ), MeasureSpec.makeMeasureSpec( height, MeasureSpec.EXACTLY ) );
} else {
int width = widthSpecSize - handle.getMeasuredWidth() - mTopOffset;
mContent.measure( MeasureSpec.makeMeasureSpec( width, MeasureSpec.EXACTLY ), MeasureSpec.makeMeasureSpec( heightSpecSize, MeasureSpec.EXACTLY ) );
}
setMeasuredDimension( widthSpecSize, heightSpecSize );
}
@Override
protected void dispatchDraw( Canvas canvas )
{
final long drawingTime = getDrawingTime();
final View handle = mHandle;
final boolean isVertical = mVertical;
drawChild( canvas, handle, drawingTime );
if ( mTracking || mAnimating ) {
final Bitmap cache = mContent.getDrawingCache();
if ( cache != null ) {
if ( isVertical ) {
if( mInvert ) {
canvas.drawBitmap( cache, 0, handle.getTop() - (getBottom() - getTop()) + mHandleHeight, null );
} else {
canvas.drawBitmap( cache, 0, handle.getBottom(), null );
}
} else {
canvas.drawBitmap( cache, mInvert ? handle.getLeft() - cache.getWidth() : handle.getRight(), 0, null );
}
} else {
canvas.save();
if( mInvert ) {
canvas.translate( isVertical ? 0 : handle.getLeft() - mTopOffset - mContent.getMeasuredWidth(), isVertical ? handle.getTop() - mTopOffset - mContent.getMeasuredHeight() : 0 );
} else {
canvas.translate( isVertical ? 0 : handle.getLeft() - mTopOffset, isVertical ? handle.getTop() - mTopOffset : 0 );
}
drawChild( canvas, mContent, drawingTime );
canvas.restore();
}
invalidate();
} else if ( mExpanded ) {
drawChild( canvas, mContent, drawingTime );
}
}
public static final String LOG_TAG = "Sliding";
@Override
protected void onLayout( boolean changed, int l, int t, int r, int b )
{
if ( mTracking ) { return; }
final int width = r - l;
final int height = b - t;
final View handle = mHandle;
int handleWidth = handle.getMeasuredWidth();
int handleHeight = handle.getMeasuredHeight();
Log.d( LOG_TAG, "handleHeight: " + handleHeight );
int handleLeft;
int handleTop;
final View content = mContent;
if ( mVertical ) {
handleLeft = ( width - handleWidth ) / 2;
if ( mInvert ) {
Log.d( LOG_TAG, "content.layout(1)" );
handleTop = mExpanded ? height - mBottomOffset - handleHeight : mTopOffset;
content.layout( 0, mTopOffset, content.getMeasuredWidth(), mTopOffset + content.getMeasuredHeight() );
} else {
handleTop = mExpanded ? mTopOffset : height - handleHeight + mBottomOffset;
content.layout( 0, mTopOffset + handleHeight, content.getMeasuredWidth(), mTopOffset + handleHeight + content.getMeasuredHeight() );
}
} else {
handleTop = ( height - handleHeight ) / 2;
if( mInvert ) {
handleLeft = mExpanded ? width - mBottomOffset - handleWidth : mTopOffset;
content.layout( mTopOffset, 0, mTopOffset + content.getMeasuredWidth(), content.getMeasuredHeight() );
} else {
handleLeft = mExpanded ? mTopOffset : width - handleWidth + mBottomOffset;
content.layout( mTopOffset + handleWidth, 0, mTopOffset + handleWidth + content.getMeasuredWidth(), content.getMeasuredHeight() );
}
}
handle.layout( handleLeft, handleTop, handleLeft + handleWidth, handleTop + handleHeight );
mHandleHeight = handle.getHeight();
mHandleWidth = handle.getWidth();
}
@Override
public boolean onInterceptTouchEvent( MotionEvent event )
{
if ( mLocked ) { return false; }
final int action = event.getAction();
float x = event.getX();
float y = event.getY();
final Rect frame = mFrame;
final View handle = mHandle;
handle.getHitRect( frame );
if ( !mTracking && !frame.contains( (int)x, (int)y ) ) { return false; }
if ( action == MotionEvent.ACTION_DOWN ) {
mTracking = true;
handle.setPressed( true );
// Must be called before prepareTracking()
prepareContent();
// Must be called after prepareContent()
if ( mOnDrawerScrollListener != null ) {
mOnDrawerScrollListener.onScrollStarted();
}
if ( mVertical ) {
final int top = mHandle.getTop();
mTouchDelta = (int)y - top;
prepareTracking( top );
} else {
final int left = mHandle.getLeft();
mTouchDelta = (int)x - left;
prepareTracking( left );
}
mVelocityTracker.addMovement( event );
}
return true;
}
@Override
public boolean onTouchEvent( MotionEvent event )
{
if ( mLocked ) { return true; }
if ( mTracking ) {
mVelocityTracker.addMovement( event );
final int action = event.getAction();
switch ( action ) {
case MotionEvent.ACTION_MOVE:
moveHandle( (int)( mVertical ? event.getY() : event.getX() ) - mTouchDelta );
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL: {
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity( mVelocityUnits );
float yVelocity = velocityTracker.getYVelocity();
float xVelocity = velocityTracker.getXVelocity();
boolean negative;
final boolean vertical = mVertical;
if ( vertical ) {
negative = yVelocity < 0;
if ( xVelocity < 0 ) {
xVelocity = -xVelocity;
}
// fix by Maciej Ciemięga.
if ( (!mInvert && xVelocity > mMaximumMinorVelocity) || (mInvert && xVelocity < mMaximumMinorVelocity) ) {
xVelocity = mMaximumMinorVelocity;
}
} else {
negative = xVelocity < 0;
if ( yVelocity < 0 ) {
yVelocity = -yVelocity;
}
// fix by Maciej Ciemięga.
if ( (!mInvert && yVelocity > mMaximumMinorVelocity) || (mInvert && yVelocity < mMaximumMinorVelocity) ) {
yVelocity = mMaximumMinorVelocity;
}
}
float velocity = (float)Math.hypot( xVelocity, yVelocity );
if ( negative ) {
velocity = -velocity;
}
final int handleTop = mHandle.getTop();
final int handleLeft = mHandle.getLeft();
final int handleBottom = mHandle.getBottom();
final int handleRight = mHandle.getRight();
if ( Math.abs( velocity ) < mMaximumTapVelocity ) {
boolean c1;
boolean c2;
boolean c3;
boolean c4;
if( mInvert ) {
c1 = ( mExpanded && (getBottom() - handleBottom ) < mTapThreshold + mBottomOffset );
c2 = ( !mExpanded && handleTop < mTopOffset + mHandleHeight - mTapThreshold );
c3 = ( mExpanded && (getRight() - handleRight ) < mTapThreshold + mBottomOffset );
c4 = ( !mExpanded && handleLeft > mTopOffset + mHandleWidth + mTapThreshold );
} else {
c1 = ( mExpanded && handleTop < mTapThreshold + mTopOffset );
c2 = ( !mExpanded && handleTop > mBottomOffset + getBottom() - getTop() - mHandleHeight - mTapThreshold );
c3 = ( mExpanded && handleLeft < mTapThreshold + mTopOffset );
c4 = ( !mExpanded && handleLeft > mBottomOffset + getRight() - getLeft() - mHandleWidth - mTapThreshold );
}
Log.d( LOG_TAG, "ACTION_UP: " + "c1: " + c1 + ", c2: " + c2 + ", c3: " + c3 + ", c4: " + c4 );
if ( vertical ? c1 || c2 : c3 || c4 ) {
if ( mAllowSingleTap ) {
playSoundEffect( SoundEffectConstants.CLICK );
if ( mExpanded ) {
animateClose( vertical ? handleTop : handleLeft );
} else {
animateOpen( vertical ? handleTop : handleLeft );
}
} else {
performFling( vertical ? handleTop : handleLeft, velocity, false );
}
} else {
performFling( vertical ? handleTop : handleLeft, velocity, false );
}
} else {
performFling( vertical ? handleTop : handleLeft, velocity, false );
}
}
break;
}
}
return mTracking || mAnimating || super.onTouchEvent( event );
}
private void animateClose( int position )
{
prepareTracking( position );
performFling( position, mMaximumAcceleration, true );
}
private void animateOpen( int position )
{
prepareTracking( position );
performFling( position, -mMaximumAcceleration, true );
}
private void performFling( int position, float velocity, boolean always )
{
mAnimationPosition = position;
mAnimatedVelocity = velocity;
boolean c1;
boolean c2;
boolean c3;
if ( mExpanded )
{
int bottom = mVertical ? getBottom() : getRight();
int handleHeight = mVertical ? mHandleHeight : mHandleWidth;
Log.d( LOG_TAG, "position: " + position + ", velocity: " + velocity + ", mMaximumMajorVelocity: " + mMaximumMajorVelocity );
c1 = mInvert ? velocity < mMaximumMajorVelocity : velocity > mMaximumMajorVelocity;
c2 = mInvert ? ( bottom - (position + handleHeight) ) + mBottomOffset > handleHeight : position > mTopOffset + ( mVertical ? mHandleHeight : mHandleWidth );
c3 = mInvert ? velocity < -mMaximumMajorVelocity : velocity > -mMaximumMajorVelocity;
Log.d( LOG_TAG, "EXPANDED. c1: " + c1 + ", c2: " + c2 + ", c3: " + c3 );
if ( always || ( c1 || ( c2 && c3 ) ) ) {
// We are expanded, So animate to CLOSE!
mAnimatedAcceleration = mMaximumAcceleration;
if( mInvert )
{
if ( velocity > 0 ) {
mAnimatedVelocity = 0;
}
} else {
if ( velocity < 0 ) {
mAnimatedVelocity = 0;
}
}
} else {
// We are expanded, but they didn't move sufficiently to cause
// us to retract. Animate back to the expanded position. so animate BACK to expanded!
mAnimatedAcceleration = -mMaximumAcceleration;
if( mInvert ) {
if ( velocity < 0 ) {
mAnimatedVelocity = 0;
}
} else {
if ( velocity > 0 ) {
mAnimatedVelocity = 0;
}
}
}
} else {
// WE'RE COLLAPSED
c1 = mInvert ? velocity < mMaximumMajorVelocity : velocity > mMaximumMajorVelocity;
c2 = mInvert ? ( position < ( mVertical ? getHeight() : getWidth() ) / 2 ) : ( position > ( mVertical ? getHeight() : getWidth() ) / 2 );
c3 = mInvert ? velocity < -mMaximumMajorVelocity : velocity > -mMaximumMajorVelocity;
Log.d( LOG_TAG, "COLLAPSED. position: " + position + ", velocity: " + velocity + ", mMaximumMajorVelocity: " + mMaximumMajorVelocity );
Log.d( LOG_TAG, "COLLAPSED. always: " + always + ", c1: " + c1 + ", c2: " + c2 + ", c3: " + c3 );
if ( !always && ( c1 || ( c2 && c3 ) ) ) {
mAnimatedAcceleration = mMaximumAcceleration;
if( mInvert ) {
if ( velocity > 0 ) {
mAnimatedVelocity = 0;
}
} else {
if ( velocity < 0 ) {
mAnimatedVelocity = 0;
}
}
} else {
mAnimatedAcceleration = -mMaximumAcceleration;
if( mInvert ) {
if ( velocity < 0 ) {
mAnimatedVelocity = 0;
}
} else {
if ( velocity > 0 ) {
mAnimatedVelocity = 0;
}
}
}
}
long now = SystemClock.uptimeMillis();
mAnimationLastTime = now;
mCurrentAnimationTime = now + ANIMATION_FRAME_DURATION;
mAnimating = true;
mHandler.removeMessages( MSG_ANIMATE );
mHandler.sendMessageAtTime( mHandler.obtainMessage( MSG_ANIMATE ), mCurrentAnimationTime );
stopTracking();
}
private void prepareTracking( int position )
{
mTracking = true;
mVelocityTracker = VelocityTracker.obtain();
boolean opening = !mExpanded;
if ( opening ) {
mAnimatedAcceleration = mMaximumAcceleration;
mAnimatedVelocity = mMaximumMajorVelocity;
if( mInvert )
mAnimationPosition = mTopOffset;
else
mAnimationPosition = mBottomOffset + ( mVertical ? getHeight() - mHandleHeight : getWidth() - mHandleWidth );
moveHandle( (int)mAnimationPosition );
mAnimating = true;
mHandler.removeMessages( MSG_ANIMATE );
long now = SystemClock.uptimeMillis();
mAnimationLastTime = now;
mCurrentAnimationTime = now + ANIMATION_FRAME_DURATION;
mAnimating = true;
} else {
if ( mAnimating ) {
mAnimating = false;
mHandler.removeMessages( MSG_ANIMATE );
}
moveHandle( position );
}
}
private void moveHandle( int position )
{
final View handle = mHandle;
if ( mVertical ) {
if ( position == EXPANDED_FULL_OPEN ) {
if( mInvert )
handle.offsetTopAndBottom( mBottomOffset + getBottom() - getTop() - mHandleHeight );
else
handle.offsetTopAndBottom( mTopOffset - handle.getTop() );
invalidate();
} else if ( position == COLLAPSED_FULL_CLOSED ) {
if( mInvert ) {
handle.offsetTopAndBottom( mTopOffset - handle.getTop() );
} else {
handle.offsetTopAndBottom( mBottomOffset + getBottom() - getTop() - mHandleHeight - handle.getTop() );
}
invalidate();
} else
{
final int top = handle.getTop();
int deltaY = position - top;
if ( position < mTopOffset ) {
deltaY = mTopOffset - top;
} else if ( deltaY > mBottomOffset + getBottom() - getTop() - mHandleHeight - top ) {
deltaY = mBottomOffset + getBottom() - getTop() - mHandleHeight - top;
}
handle.offsetTopAndBottom( deltaY );
final Rect frame = mFrame;
final Rect region = mInvalidate;
handle.getHitRect( frame );
region.set( frame );
region.union( frame.left, frame.top - deltaY, frame.right, frame.bottom - deltaY );
region.union( 0, frame.bottom - deltaY, getWidth(), frame.bottom - deltaY + mContent.getHeight() );
invalidate( region );
}
} else {
if ( position == EXPANDED_FULL_OPEN ) {
if( mInvert )
handle.offsetLeftAndRight( mBottomOffset + getRight() - getLeft() - mHandleWidth );
else
handle.offsetLeftAndRight( mTopOffset - handle.getLeft() );
invalidate();
} else if ( position == COLLAPSED_FULL_CLOSED ) {
if( mInvert )
handle.offsetLeftAndRight( mTopOffset - handle.getLeft() );
else
handle.offsetLeftAndRight( mBottomOffset + getRight() - getLeft() - mHandleWidth - handle.getLeft() );
invalidate();
} else {
final int left = handle.getLeft();
int deltaX = position - left;
if ( position < mTopOffset ) {
deltaX = mTopOffset - left;
} else if ( deltaX > mBottomOffset + getRight() - getLeft() - mHandleWidth - left ) {
deltaX = mBottomOffset + getRight() - getLeft() - mHandleWidth - left;
}
handle.offsetLeftAndRight( deltaX );
final Rect frame = mFrame;
final Rect region = mInvalidate;
handle.getHitRect( frame );
region.set( frame );
region.union( frame.left - deltaX, frame.top, frame.right - deltaX, frame.bottom );
region.union( frame.right - deltaX, 0, frame.right - deltaX + mContent.getWidth(), getHeight() );
invalidate( region );
}
}
}
private void prepareContent()
{
if ( mAnimating ) { return; }
// Something changed in the content, we need to honor the layout request
// before creating the cached bitmap
final View content = mContent;
if ( content.isLayoutRequested() ) {
if ( mVertical ) {
final int handleHeight = mHandleHeight;
int height = getBottom() - getTop() - handleHeight - mTopOffset;
content.measure( MeasureSpec.makeMeasureSpec( getRight() - getLeft(), MeasureSpec.EXACTLY ), MeasureSpec.makeMeasureSpec( height, MeasureSpec.EXACTLY ) );
Log.d( LOG_TAG, "content.layout(2)" );
if ( mInvert )
content.layout( 0, mTopOffset, content.getMeasuredWidth(), mTopOffset + content.getMeasuredHeight() );
else
content.layout( 0, mTopOffset + handleHeight, content.getMeasuredWidth(), mTopOffset + handleHeight + content.getMeasuredHeight() );
} else {
final int handleWidth = mHandle.getWidth();
int width = getRight() - getLeft() - handleWidth - mTopOffset;
content.measure( MeasureSpec.makeMeasureSpec( width, MeasureSpec.EXACTLY ), MeasureSpec.makeMeasureSpec( getBottom() - getTop(), MeasureSpec.EXACTLY ) );
if( mInvert )
content.layout( mTopOffset, 0, mTopOffset + content.getMeasuredWidth(), content.getMeasuredHeight() );
else
content.layout( handleWidth + mTopOffset, 0, mTopOffset + handleWidth + content.getMeasuredWidth(), content.getMeasuredHeight() );
}
}
// Try only once... we should really loop but it's not a big deal
// if the draw was cancelled, it will only be temporary anyway
content.getViewTreeObserver().dispatchOnPreDraw();
content.buildDrawingCache();
content.setVisibility( View.GONE );
}
private void stopTracking()
{
mHandle.setPressed( false );
mTracking = false;
if ( mOnDrawerScrollListener != null ) {
mOnDrawerScrollListener.onScrollEnded();
}
if ( mVelocityTracker != null ) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
}
private void doAnimation()
{
if ( mAnimating ) {
incrementAnimation();
if( mInvert )
{
if ( mAnimationPosition < mTopOffset ) {
mAnimating = false;
closeDrawer();
} else if ( mAnimationPosition >= mTopOffset + ( mVertical ? getHeight() : getWidth() ) - 1 ) {
mAnimating = false;
openDrawer();
} else {
moveHandle( (int)mAnimationPosition );
mCurrentAnimationTime += ANIMATION_FRAME_DURATION;
mHandler.sendMessageAtTime( mHandler.obtainMessage( MSG_ANIMATE ), mCurrentAnimationTime );
}
} else {
if ( mAnimationPosition >= mBottomOffset + ( mVertical ? getHeight() : getWidth() ) - 1 ) {
mAnimating = false;
closeDrawer();
} else if ( mAnimationPosition < mTopOffset ) {
mAnimating = false;
openDrawer();
} else {
moveHandle( (int)mAnimationPosition );
mCurrentAnimationTime += ANIMATION_FRAME_DURATION;
mHandler.sendMessageAtTime( mHandler.obtainMessage( MSG_ANIMATE ), mCurrentAnimationTime );
}
}
}
}
private void incrementAnimation()
{
long now = SystemClock.uptimeMillis();
float t = ( now - mAnimationLastTime ) / 1000.0f; // ms -> s
final float position = mAnimationPosition;
final float v = mAnimatedVelocity; // px/s
final float a = mInvert ? mAnimatedAcceleration : mAnimatedAcceleration; // px/s/s
mAnimationPosition = position + ( v * t ) + ( 0.5f * a * t * t ); // px
mAnimatedVelocity = v + ( a * t ); // px/s
mAnimationLastTime = now; // ms
}
/**
* Toggles the drawer open and close. Takes effect immediately.
*
* @see #open()
* @see #close()
* @see #animateClose()
* @see #animateOpen()
* @see #animateToggle()
*/
public void toggle()
{
if ( !mExpanded ) {
openDrawer();
} else {
closeDrawer();
}
invalidate();
requestLayout();
}
/**
* Toggles the drawer open and close with an animation.
*
* @see #open()
* @see #close()
* @see #animateClose()
* @see #animateOpen()
* @see #toggle()
*/
public void animateToggle()
{
if ( !mExpanded ) {
animateOpen();
} else {
animateClose();
}
}
/**
* Opens the drawer immediately.
*
* @see #toggle()
* @see #close()
* @see #animateOpen()
*/
public void open()
{
openDrawer();
invalidate();
requestLayout();
sendAccessibilityEvent( AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED );
}
public void close()
{
closeDrawer();
invalidate();
requestLayout();
}
public void animateClose()
{
prepareContent();
final OnDrawerScrollListener scrollListener = mOnDrawerScrollListener;
if ( scrollListener != null ) {
scrollListener.onScrollStarted();
}
animateClose( mVertical ? mHandle.getTop() : mHandle.getLeft() );
if ( scrollListener != null ) {
scrollListener.onScrollEnded();
}
}
public void animateOpen()
{
prepareContent();
final OnDrawerScrollListener scrollListener = mOnDrawerScrollListener;
if ( scrollListener != null ) {
scrollListener.onScrollStarted();
}
animateOpen( mVertical ? mHandle.getTop() : mHandle.getLeft() );
sendAccessibilityEvent( AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED );
if ( scrollListener != null ) {
scrollListener.onScrollEnded();
}
}
private void closeDrawer()
{
moveHandle( COLLAPSED_FULL_CLOSED );
mContent.setVisibility( View.GONE );
mContent.destroyDrawingCache();
if ( !mExpanded ) { return; }
mExpanded = false;
if ( mOnDrawerCloseListener != null ) {
mOnDrawerCloseListener.onDrawerClosed();
}
}
private void openDrawer()
{
moveHandle( EXPANDED_FULL_OPEN );
mContent.setVisibility( View.VISIBLE );
if ( mExpanded ) { return; }
mExpanded = true;
if ( mOnDrawerOpenListener != null ) {
mOnDrawerOpenListener.onDrawerOpened();
}
}
public void setOnDrawerOpenListener( OnDrawerOpenListener onDrawerOpenListener )
{
mOnDrawerOpenListener = onDrawerOpenListener;
}
public void setOnDrawerCloseListener( OnDrawerCloseListener onDrawerCloseListener )
{
mOnDrawerCloseListener = onDrawerCloseListener;
}
public void setOnDrawerScrollListener( OnDrawerScrollListener onDrawerScrollListener )
{
mOnDrawerScrollListener = onDrawerScrollListener;
}
public View getHandle()
{
return mHandle;
}
public View getContent()
{
return mContent;
}
/**
* Unlocks the SlidingDrawer so that touch events are processed.
*
* @see #lock()
*/
public void unlock()
{
mLocked = false;
}
/**
* Locks the SlidingDrawer so that touch events are ignores.
*
* @see #unlock()
*/
public void lock()
{
mLocked = true;
}
public boolean isOpened()
{
return mExpanded;
}
/**
* Indicates whether the drawer is scrolling or flinging.
*
* @return True if the drawer is scroller or flinging, false otherwise.
*/
public boolean isMoving()
{
return mTracking || mAnimating;
}
private class DrawerToggler implements OnClickListener {
public void onClick( View v )
{
if(v.getId()==R.id.handle)
{
Toast.makeText(getContext(), "handle", Toast.LENGTH_SHORT).show();
(findViewById(R.id.handle)).setBackgroundColor(Color.BLACK);
}
if ( mLocked ) { return; }
// mAllowSingleTap isn't relevant here; you're *always*
// allowed to open/close the drawer by clicking with the
// trackball.
if ( mAnimateOnClick ) {
animateToggle();
} else {
toggle();
}
}
}
private class SlidingHandler extends Handler {
public void handleMessage( Message m )
{
switch ( m.what ) {
case MSG_ANIMATE:
doAnimation();
break;
}
}
}
}
最佳答案
使用 setOnDrawerOpenListener 监听器，如下所示:-
slidingDrawer.setOnDrawerOpenListener(new OnDrawerOpenListener() {
@Override
public void onDrawerOpened() {
Log.d("Debug","Drawer Opened");
//
iv_uporder.setImageDrawable(getResources().getDrawable(R.drawable.down));
}
});
slidingDrawer.setOnDrawerCloseListener(new OnDrawerCloseListener() {
@Override
public void onDrawerClosed() {
Log.d("Debug","Drawer Closed");
//
iv_uporder.setImageDrawable(getResources().getDrawable(R.drawable.up));
}
});
关于android - 如何在打开和关闭时更改滑动抽屉按钮图像，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20567327/