ViewPager with TabLayout issue with AnimatedVectorDrawable

Question

I am trying to implement a simple ViewPager with some animations in VectorDrawable.
Following this very good example is a solution for a good scroll tab with switching points.

The only difference is that I use vector animations. As an action, it works like a charm; when you add a ViewPager, animations do not start sequentially.

compileSdkVersion 25 buildToolsVersion "26.0.2" targetSdkVersion 25 

I am debugging my device (SG7), I set a breakpoint on animation.start ()

• on the middle screen, the breakpoint is not always called
• more often on screens 1 and 3, animation does not start
• when jumping using points between 1 and 3 animations it always works! but not when performing 1-2 or 2-3!

All this works on one big VectorDrawable with 3 animated groups.
2 signatures, sliding at the beginning, and then endlessly rolling backs, rotation always works.

Activities

  @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main_activity); mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); // Set up the ViewPager with the sections adapter. mViewPager = (ViewPager) findViewById(R.id.pager); mHideHandler.post(mHidePart2Runnable); mViewPager.setAdapter(mSectionsPagerAdapter); TabLayout tabLayout = (TabLayout) findViewById(R.id.tabDots); tabLayout.setupWithViewPager(mViewPager, true); }; 

Fragment:

  public class SectionsPagerAdapter extends FragmentPagerAdapter { public SectionsPagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int position) { // getItem is called to instantiate the fragment for the given page. // Return a PlaceholderFragment (defined as a static inner class below). return PlaceholderFragment.newInstance(position + 1); } @Override public int getCount() { // Show 3 total pages. return 3; } 

Static fragment

  public static class PlaceholderFragment extends Fragment { /** * The fragment argument representing the section number for this * fragment. */ private static final String ARG_SECTION_NUMBER = "section_number"; public PlaceholderFragment() { } /** * Returns a new instance of this fragment for the given section * number. */ public static PlaceholderFragment newInstance(int sectionNumber) { PlaceholderFragment fragment = new PlaceholderFragment(); Bundle args = new Bundle(); args.putInt(ARG_SECTION_NUMBER, sectionNumber); fragment.setArguments(args); return fragment; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.activity_fullscreen, container, false); View imgView = rootView.findViewById(R.id.vec_anim); Drawable drawable = ((ImageView)imgView).getDrawable(); if (drawable instanceof Animatable) { ((Animatable) drawable).start(); }; return rootView; } 

I'm new to this, I wanted to talk about the impact of SVG size on performance (by thinking about caching svgs and starting the animation when creating the view, maybe ...), and I'm trying to optimize all this and make it smooth; smooth. But above all, it does not work properly.

Why does the checkpoint not always fall when sharing pages?
Is there a better way to do this?

Answer 1

try it,

• Add library compile com.mcxiaoke.viewpagerindicator:library: 2.4.1@aar ' .

• Your main layout file,

  <RelativeLayout android:id="@+id/pager_layout" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="right"> <android.support.v4.view.ViewPager android:id="@+id/pager_profile" android:layout_width="fill_parent" android:layout_height="match_parent" app:layout_behavior="@string/appbar_scrolling_view_behavior"> </android.support.v4.view.ViewPager> <yourpackagename.utils.CirclePageIndicator android:id="@+id/cover_photo_indicator" android:layout_width="wrap_content" android:layout_height="wrap_content" android:foregroundGravity="right" android:layout_alignParentBottom="true" android:layout_alignParentEnd="true" android:padding="10dip" /> </RelativeLayout> 

3. Create a custom CirclePageIndicator class

 /** * Draws circles (one for each view). The current view position is filled and * others are only stroked. */ public class CirclePageIndicator extends View implements PageIndicator { private static final int INVALID_POINTER = -1; private float mRadius; private final Paint mPaintPageFill = new Paint(ANTI_ALIAS_FLAG); private final Paint mPaintStroke = new Paint(ANTI_ALIAS_FLAG); private final Paint mPaintFill = new Paint(ANTI_ALIAS_FLAG); private ViewPager mViewPager; private ViewPager.OnPageChangeListener mListener; private int mCurrentPage; private int mSnapPage; private float mPageOffset; private int mScrollState; private int mOrientation; private boolean mCentered; private boolean mSnap; private int mTouchSlop; private float mLastMotionX = -1; private int mActivePointerId = INVALID_POINTER; private boolean mIsDragging; public CirclePageIndicator(Context context) { this(context, null); } public CirclePageIndicator(Context context, AttributeSet attrs) { this(context, attrs, R.attr.vpiCirclePageIndicatorStyle); } public CirclePageIndicator(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); if (isInEditMode()) return; //Load defaults from resources final Resources res = getResources(); final int defaultPageColor = res.getColor(R.color.default_circle_indicator_page_color); //default_circle_indicator_fill_color final int defaultFillColor = res.getColor(R.color.holo_blue_dark); final int defaultOrientation = res.getInteger(R.integer.default_circle_indicator_orientation); final int defaultStrokeColor = res.getColor(R.color.default_circle_indicator_stroke_color); final float defaultStrokeWidth = res.getDimension(R.dimen.default_circle_indicator_stroke_width); final float defaultRadius = res.getDimension(R.dimen.default_circle_indicator_radius); final boolean defaultCentered = res.getBoolean(R.bool.default_circle_indicator_centered); final boolean defaultSnap = res.getBoolean(R.bool.default_circle_indicator_snap); //Retrieve styles attributes TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CirclePageIndicator, defStyle, 0); mCentered = a.getBoolean(R.styleable.CirclePageIndicator_centered, defaultCentered); mOrientation = a.getInt(R.styleable.CirclePageIndicator_android_orientation, defaultOrientation); mPaintPageFill.setStyle(Style.FILL); mPaintPageFill.setColor(a.getColor(R.styleable.CirclePageIndicator_pageColor, defaultPageColor)); mPaintStroke.setStyle(Style.STROKE); mPaintStroke.setColor(a.getColor(R.styleable.CirclePageIndicator_strokeColor, defaultStrokeColor)); mPaintStroke.setStrokeWidth(a.getDimension(R.styleable.CirclePageIndicator_strokeWidth, defaultStrokeWidth)); mPaintFill.setStyle(Style.FILL); mPaintFill.setColor(a.getColor(R.styleable.CirclePageIndicator_fillColor, defaultFillColor)); mRadius = a.getDimension(R.styleable.CirclePageIndicator_radius, defaultRadius); mSnap = a.getBoolean(R.styleable.CirclePageIndicator_snap, defaultSnap); Drawable background = a.getDrawable(R.styleable.CirclePageIndicator_android_background); if (background != null) { setBackgroundDrawable(background); } a.recycle(); final ViewConfiguration configuration = ViewConfiguration.get(context); mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration); } public void setCentered(boolean centered) { mCentered = centered; invalidate(); } public boolean isCentered() { return mCentered; } public void setPageColor(int pageColor) { mPaintPageFill.setColor(pageColor); invalidate(); } public int getPageColor() { return mPaintPageFill.getColor(); } public void setFillColor(int fillColor) { mPaintFill.setColor(fillColor); invalidate(); } public int getFillColor() { return mPaintFill.getColor(); } public void setOrientation(int orientation) { switch (orientation) { case HORIZONTAL: case VERTICAL: mOrientation = orientation; requestLayout(); break; default: throw new IllegalArgumentException("Orientation must be either HORIZONTAL or VERTICAL."); } } public int getOrientation() { return mOrientation; } public void setStrokeColor(int strokeColor) { mPaintStroke.setColor(strokeColor); invalidate(); } public int getStrokeColor() { return mPaintStroke.getColor(); } public void setStrokeWidth(float strokeWidth) { mPaintStroke.setStrokeWidth(strokeWidth); invalidate(); } public float getStrokeWidth() { return mPaintStroke.getStrokeWidth(); } public void setRadius(float radius) { mRadius = radius; invalidate(); } public float getRadius() { return mRadius; } public void setSnap(boolean snap) { mSnap = snap; invalidate(); } public boolean isSnap() { return mSnap; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (mViewPager == null) { return; } final int count = mViewPager.getAdapter().getCount(); if (count == 0) { return; } if (mCurrentPage >= count) { setCurrentItem(count - 1); return; } int longSize; int longPaddingBefore; int longPaddingAfter; int shortPaddingBefore; if (mOrientation == HORIZONTAL) { longSize = getWidth(); longPaddingBefore = getPaddingLeft(); longPaddingAfter = getPaddingRight(); shortPaddingBefore = getPaddingTop(); } else { longSize = getHeight(); longPaddingBefore = getPaddingTop(); longPaddingAfter = getPaddingBottom(); shortPaddingBefore = getPaddingLeft(); } final float threeRadius = mRadius * 3; final float shortOffset = shortPaddingBefore + mRadius; float longOffset = longPaddingBefore + mRadius; if (mCentered) { longOffset += ((longSize - longPaddingBefore - longPaddingAfter) / 2.0f) - ((count * threeRadius) / 2.0f); } float dX; float dY; float pageFillRadius = mRadius; if (mPaintStroke.getStrokeWidth() > 0) { pageFillRadius -= mPaintStroke.getStrokeWidth() / 2.0f; } //Draw stroked circles for (int iLoop = 0; iLoop < count; iLoop++) { float drawLong = longOffset + (iLoop * threeRadius); if (mOrientation == HORIZONTAL) { dX = drawLong; dY = shortOffset; } else { dX = shortOffset; dY = drawLong; } // Only paint fill if not completely transparent if (mPaintPageFill.getAlpha() > 0) { canvas.drawCircle(dX, dY, pageFillRadius, mPaintPageFill); } // Only paint stroke if a stroke width was non-zero if (pageFillRadius != mRadius) { canvas.drawCircle(dX, dY, mRadius, mPaintStroke); } } //Draw the filled circle according to the current scroll float cx = (mSnap ? mSnapPage : mCurrentPage) * threeRadius; if (!mSnap) { cx += mPageOffset * threeRadius; } if (mOrientation == HORIZONTAL) { dX = longOffset + cx; dY = shortOffset; } else { dX = shortOffset; dY = longOffset + cx; } canvas.drawCircle(dX, dY, mRadius, mPaintFill); } public boolean onTouchEvent(android.view.MotionEvent ev) { if (super.onTouchEvent(ev)) { return true; } if ((mViewPager == null) || (mViewPager.getAdapter().getCount() == 0)) { return false; } final int action = ev.getAction() & MotionEventCompat.ACTION_MASK; switch (action) { case MotionEvent.ACTION_DOWN: mActivePointerId = MotionEventCompat.getPointerId(ev, 0); mLastMotionX = ev.getX(); break; case MotionEvent.ACTION_MOVE: { final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId); final float x = MotionEventCompat.getX(ev, activePointerIndex); final float deltaX = x - mLastMotionX; if (!mIsDragging) { if (Math.abs(deltaX) > mTouchSlop) { mIsDragging = true; } } if (mIsDragging) { mLastMotionX = x; if (mViewPager.isFakeDragging() || mViewPager.beginFakeDrag()) { mViewPager.fakeDragBy(deltaX); } } break; } case MotionEvent.ACTION_CANCEL: case MotionEvent.ACTION_UP: if (!mIsDragging) { final int count = mViewPager.getAdapter().getCount(); final int width = getWidth(); final float halfWidth = width / 2f; final float sixthWidth = width / 6f; if ((mCurrentPage > 0) && (ev.getX() < halfWidth - sixthWidth)) { if (action != MotionEvent.ACTION_CANCEL) { mViewPager.setCurrentItem(mCurrentPage - 1); } return true; } else if ((mCurrentPage < count - 1) && (ev.getX() > halfWidth + sixthWidth)) { if (action != MotionEvent.ACTION_CANCEL) { mViewPager.setCurrentItem(mCurrentPage + 1); } return true; } } mIsDragging = false; mActivePointerId = INVALID_POINTER; if (mViewPager.isFakeDragging()) mViewPager.endFakeDrag(); break; case MotionEventCompat.ACTION_POINTER_DOWN: { final int index = MotionEventCompat.getActionIndex(ev); mLastMotionX = MotionEventCompat.getX(ev, index); mActivePointerId = MotionEventCompat.getPointerId(ev, index); break; } case MotionEventCompat.ACTION_POINTER_UP: final int pointerIndex = MotionEventCompat.getActionIndex(ev); final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex); if (pointerId == mActivePointerId) { final int newPointerIndex = pointerIndex == 0 ? 1 : 0; mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex); } mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId)); break; } return true; } @Override public void setViewPager(ViewPager view) { if (mViewPager == view) { return; } if (mViewPager != null) { mViewPager.setOnPageChangeListener(null); } if (view.getAdapter() == null) { throw new IllegalStateException("ViewPager does not have adapter instance."); } mViewPager = view; mViewPager.setOnPageChangeListener(this); invalidate(); } @Override public void setViewPager(ViewPager view, int initialPosition) { setViewPager(view); setCurrentItem(initialPosition); } @Override public void setCurrentItem(int item) { if (mViewPager == null) { throw new IllegalStateException("ViewPager has not been bound."); } mViewPager.setCurrentItem(item); mCurrentPage = item; invalidate(); } @Override public void notifyDataSetChanged() { invalidate(); } @Override public void onPageScrollStateChanged(int state) { mScrollState = state; if (mListener != null) { mListener.onPageScrollStateChanged(state); } } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { mCurrentPage = position; mPageOffset = positionOffset; invalidate(); if (mListener != null) { mListener.onPageScrolled(position, positionOffset, positionOffsetPixels); } } @Override public void onPageSelected(int position) { if (mSnap || mScrollState == ViewPager.SCROLL_STATE_IDLE) { mCurrentPage = position; mSnapPage = position; invalidate(); } if (mListener != null) { mListener.onPageSelected(position); } } @Override public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) { mListener = listener; } /* * (non-Javadoc) * * @see android.view.View#onMeasure(int, int) */ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (mOrientation == HORIZONTAL) { setMeasuredDimension(measureLong(widthMeasureSpec), measureShort(heightMeasureSpec)); } else { setMeasuredDimension(measureShort(widthMeasureSpec), measureLong(heightMeasureSpec)); } } /** * Determines the width of this view * * @param measureSpec * A measureSpec packed into an int * @return The width of the view, honoring constraints from measureSpec */ private int measureLong(int measureSpec) { int result; int specMode = MeasureSpec.getMode(measureSpec); int specSize = MeasureSpec.getSize(measureSpec); if ((specMode == MeasureSpec.EXACTLY) || (mViewPager == null)) { //We were told how big to be result = specSize; } else { //Calculate the width according the views count final int count = mViewPager.getAdapter().getCount(); result = (int)(getPaddingLeft() + getPaddingRight() + (count * 2 * mRadius) + (count - 1) * mRadius + 1); //Respect AT_MOST value if that was what is called for by measureSpec if (specMode == MeasureSpec.AT_MOST) { result = Math.min(result, specSize); } } return result; } /** * Determines the height of this view * * @param measureSpec * A measureSpec packed into an int * @return The height of the view, honoring constraints from measureSpec */ private int measureShort(int measureSpec) { int result; int specMode = MeasureSpec.getMode(measureSpec); int specSize = MeasureSpec.getSize(measureSpec); if (specMode == MeasureSpec.EXACTLY) { //We were told how big to be result = specSize; } else { //Measure the height result = (int)(2 * mRadius + getPaddingTop() + getPaddingBottom() + 1); //Respect AT_MOST value if that was what is called for by measureSpec if (specMode == MeasureSpec.AT_MOST) { result = Math.min(result, specSize); } } return result; } @Override public void onRestoreInstanceState(Parcelable state) { SavedState savedState = (SavedState)state; super.onRestoreInstanceState(savedState.getSuperState()); mCurrentPage = savedState.currentPage; mSnapPage = savedState.currentPage; requestLayout(); } @Override public Parcelable onSaveInstanceState() { Parcelable superState = super.onSaveInstanceState(); SavedState savedState = new SavedState(superState); savedState.currentPage = mCurrentPage; return savedState; } static class SavedState extends BaseSavedState { int currentPage; public SavedState(Parcelable superState) { super(superState); } private SavedState(Parcel in) { super(in); currentPage = in.readInt(); } @Override public void writeToParcel(Parcel dest, int flags) { super.writeToParcel(dest, flags); dest.writeInt(currentPage); } @SuppressWarnings("UnusedDeclaration") 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]; } }; } } 

4. Create indicator_tags.xml inside res -> values

---

 <resources> <bool name="default_circle_indicator_centered">true</bool> <color name="default_circle_indicator_fill_color">#FFFF0000</color> <color name="default_circle_indicator_page_color">#00000000</color> <integer name="default_circle_indicator_orientation">0</integer> <dimen name="default_circle_indicator_radius">4dp</dimen> <bool name="default_circle_indicator_snap">false</bool> <color name="default_circle_indicator_stroke_color">#FFDDDDDD</color> <dimen name="default_circle_indicator_stroke_width">1dp</dimen> <declare-styleable name="ViewPagerIndicator"> <!-- Style of the circle indicator. --> <attr name="vpiCirclePageIndicatorStyle" format="reference" /> <!-- Style of the icon indicator views. --> <attr name="vpiIconPageIndicatorStyle" format="reference" /> <!-- Style of the line indicator. --> <attr name="vpiLinePageIndicatorStyle" format="reference" /> <!-- Style of the title indicator. --> <attr name="vpiTitlePageIndicatorStyle" format="reference" /> <!-- Style of the tab indicator tabs. --> <attr name="vpiTabPageIndicatorStyle" format="reference" /> <!-- Style of the underline indicator. --> <attr name="vpiUnderlinePageIndicatorStyle" format="reference" /> </declare-styleable> <attr name="centered" format="boolean" /> <attr name="selectedColor" format="color" /> <attr name="strokeWidth" format="dimension" /> <attr name="unselectedColor" format="color" /> <declare-styleable name="CirclePageIndicator"> <!-- Whether or not the indicators should be centered. --> <attr name="centered" /> <!-- Color of the filled circle that represents the current page. --> <attr name="fillColor" format="color" /> <!-- Color of the filled circles that represents pages. --> <attr name="pageColor" format="color" /> <!-- Orientation of the indicator. --> <attr name="android:orientation" /> <!-- Radius of the circles. This is also the spacing between circles. --> <attr name="radius" format="dimension" /> <!-- Whether or not the selected indicator snaps to the circles. --> <attr name="snap" format="boolean" /> <!-- Color of the open circles. --> <attr name="strokeColor" format="color" /> <!-- Width of the stroke used to draw the circles. --> <attr name="strokeWidth" /> <!-- View background --> <attr name="android:background" /> </declare-styleable> <declare-styleable name="LinePageIndicator"> <!-- Whether or not the indicators should be centered. --> <attr name="centered" /> <!-- Color of the unselected lines that represent the pages. --> <attr name="unselectedColor" /> <!-- Color of the selected line that represents the current page. --> <attr name="selectedColor" /> <!-- Width of each indicator line. --> <attr name="lineWidth" format="dimension" /> <!-- Width of each indicator line stroke. --> <attr name="strokeWidth" /> <!-- Width of the gap between each indicator line. --> <attr name="gapWidth" format="dimension" /> <!-- View background --> <attr name="android:background" /> </declare-styleable> <declare-styleable name="TitlePageIndicator"> <!-- Screen edge padding. --> <attr name="clipPadding" format="dimension" /> <!-- Color of the footer line and indicator. --> <attr name="footerColor" format="color" /> <!-- Height of the footer line. --> <attr name="footerLineHeight" format="dimension" /> <!-- Style of the indicator. Default is triangle. --> <attr name="footerIndicatorStyle"> <enum name="none" value="0" /> <enum name="triangle" value="1" /> <enum name="underline" value="2" /> </attr> <!-- Height of the indicator above the footer line. --> <attr name="footerIndicatorHeight" format="dimension" /> <!-- Left and right padding of the underline indicator. --> <attr name="footerIndicatorUnderlinePadding" format="dimension" /> <!-- Padding between the bottom of the title and the footer. --> <attr name="footerPadding" format="dimension" /> <!-- Position of the line. --> <attr name="linePosition"> <enum name="bottom" value="0" /> <enum name="top" value="1" /> </attr> <!-- Color of the selected title. --> <attr name="selectedColor" /> <!-- Whether or not the selected item is displayed as bold. --> <attr name="selectedBold" format="boolean" /> <!-- Color of regular titles. --> <attr name="android:textColor" /> <!-- Size of title text. --> <attr name="android:textSize" /> <!-- Padding between titles when bumping into each other. --> <attr name="titlePadding" format="dimension" /> <!-- Padding between titles and the top of the View. --> <attr name="topPadding" format="dimension" /> <!-- View background --> <attr name="android:background" /> </declare-styleable> <declare-styleable name="UnderlinePageIndicator"> <!-- Whether or not the selected indicator fades. --> <attr name="fades" format="boolean" /> <!-- Length of the delay to fade the indicator. --> <attr name="fadeDelay" format="integer" /> <!-- Length of the indicator fade to transparent. --> <attr name="fadeLength" format="integer" /> <!-- Color of the selected line that represents the current page. --> <attr name="selectedColor" /> <!-- View background --> <attr name="android:background" /> </declare-styleable> </resources> 

5. Call it from MainActivity as

  // setup the view pager with its adapter vpagerProfile.setAdapter(objProfilePageTopListAdapter); // initialize circular indicator class mCirclePageIndicator = (CirclePageIndicator)findViewById(R.id.cover_photo_indicator); mCirclePageIndicator.setPageColor(android.R.color.transparent); // set viewpager to indicator so it can indicate when you change the page mCirclePageIndicator.setViewPager(vpagerProfile); 

Answer 2

A breakpoint is not called in the second fragment, because it is created along with the first or third. Android always creates at least 2 fragments at the same time - the one that is in focus and the next that can fall into focus (forward or backward). This is why you will find that in your case the middle fragment is always in the cache, and therefore it "onCreate" will never be executed separately, but in combination with 1 or 3.

Trying to sync animations with Viewpager is a nightmare. However, if you really should, my suggestion would be to implement ViewPager.OnPageChangeListener and write code to find getCurrentItem() viewpager . Once you know which piece you are using, you can initiate the animation the way you want.

This should give you a lot more control over behavior without extra lines of code.

Let me know if you want me to work out a specific point.