private float currentPositionOffset = 0f;

private Paint rectPaint;

private Paint dividerPaint;

private int indicatorColor = 0xFF666666;

private int underlineColor = 0x1A000000;

private int dividerColor = 0x1A000000;

private boolean shouldExpand = false;

private boolean textAllCaps = true;

private int scrollOffset = 52;

private int indicatorHeight = 8;

private int underlineHeight = 2;

private int dividerPadding = 12;

private int tabPadding = 24;

private int dividerWidth = 1;

private int tabTextSize = 12;

private int tabTextColor = 0xFF666666;

private int selectedTabTextColor = 0xFF666666;

private Typeface tabTypeface = null;

private int tabTypefaceStyle = Typeface.NORMAL;

private int lastScrollX = 0;

private int tabBackgroundResId = R.drawable.background_tab;

private Locale locale;

public PagerSlidingTabStrip(Context context) {

this(context, null);

}

public PagerSlidingTabStrip(Context context, AttributeSet attrs) {

this(context, attrs, 0);

}

public PagerSlidingTabStrip(Context context, AttributeSet attrs,

int defStyle) {

super(context, attrs, defStyle);

setFillViewport(true);

setWillNotDraw(false);

tabsContainer = new LinearLayout(context);

tabsContainer.setOrientation(LinearLayout.HORIZONTAL);

tabsContainer.setLayoutParams(new LayoutParams(

LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));

addView(tabsContainer);

DisplayMetrics dm = getResources().getDisplayMetrics();

scrollOffset = (int) TypedValue.applyDimension(

TypedValue.COMPLEX_UNIT_DIP, scrollOffset, dm);

indicatorHeight = (int) TypedValue.applyDimension(

TypedValue.COMPLEX_UNIT_DIP, indicatorHeight, dm);

underlineHeight = (int) TypedValue.applyDimension(

TypedValue.COMPLEX_UNIT_DIP, underlineHeight, dm);

dividerPadding = (int) TypedValue.applyDimension(

TypedValue.COMPLEX_UNIT_DIP, dividerPadding, dm);

tabPadding = (int) TypedValue.applyDimension(

TypedValue.COMPLEX_UNIT_DIP, tabPadding, dm);

dividerWidth = (int) TypedValue.applyDimension(

TypedValue.COMPLEX_UNIT_DIP, dividerWidth, dm);

tabTextSize = (int) TypedValue.applyDimension(

TypedValue.COMPLEX_UNIT_SP, tabTextSize, dm);

// get system attrs (android:textSize and android:textColor)

TypedArray a = context.obtainStyledAttributes(attrs, ATTRS);

tabTextSize = a.getDimensionPixelSize(0, tabTextSize);

tabTextColor = a.getColor(1, tabTextColor);

a.recycle();

// get custom attrs

a = context.obtainStyledAttributes(attrs,

R.styleable.PagerSlidingTabStrip);

indicatorColor = a.getColor(

R.styleable.PagerSlidingTabStrip_pstsIndicatorColor,

indicatorColor);

underlineColor = a.getColor(

R.styleable.PagerSlidingTabStrip_pstsUnderlineColor,

underlineColor);

dividerColor = a

.getColor(R.styleable.PagerSlidingTabStrip_pstsDividerColor,

dividerColor);

indicatorHeight = a.getDimensionPixelSize(

R.styleable.PagerSlidingTabStrip_pstsIndicatorHeight,

indicatorHeight);

underlineHeight = a.getDimensionPixelSize(

R.styleable.PagerSlidingTabStrip_pstsUnderlineHeight,

underlineHeight);

dividerPadding = a.getDimensionPixelSize(

R.styleable.PagerSlidingTabStrip_pstsDividerPadding,

dividerPadding);

tabPadding = a.getDimensionPixelSize(

R.styleable.PagerSlidingTabStrip_pstsTabPaddingLeftRight,

tabPadding);

tabBackgroundResId = a.getResourceId(

R.styleable.PagerSlidingTabStrip_pstsTabBackground,

tabBackgroundResId);

shouldExpand = a

.getBoolean(R.styleable.PagerSlidingTabStrip_pstsShouldExpand,

shouldExpand);

scrollOffset = a

.getDimensionPixelSize(

R.styleable.PagerSlidingTabStrip_pstsScrollOffset,

scrollOffset);

textAllCaps = a.getBoolean(

R.styleable.PagerSlidingTabStrip_pstsTextAllCaps, textAllCaps);

a.recycle();

rectPaint = new Paint();

rectPaint.setAntiAlias(true);

rectPaint.setStyle(Style.FILL);

dividerPaint = new Paint();

dividerPaint.setAntiAlias(true);

dividerPaint.setStrokeWidth(dividerWidth);

defaultTabLayoutParams = new LinearLayout.LayoutParams(

LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);

expandedTabLayoutParams = new LinearLayout.LayoutParams(0,

LayoutParams.MATCH_PARENT, 1.0f);

if (locale == null) {

locale = getResources().getConfiguration().locale;

}

}

public void setViewPager(ViewPager pager) {

this.pager = pager;

if (pager.getAdapter() == null) {

throw new IllegalStateException(

“ViewPager does not have adapter instance.”);

}

pager.setOnPageChangeListener(pageListener);

notifyDataSetChanged();

}

public void setOnPageChangeListener(OnPageChangeListener listener) {

this.delegatePageListener = listener;

}

public void notifyDataSetChanged() {

tabsContainer.removeAllViews();

tabCount = pager.getAdapter().getCount();

for (int i = 0; i < tabCount;

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i++) {

if (pager.getAdapter() instanceof IconTabProvider) {

addIconTab(i,

((IconTabProvider) pager.getAdapter())

.getPageIconResId(i));

} else {

addTextTab(i, pager.getAdapter().getPageTitle(i).toString());

}

}

updateTabStyles();

getViewTreeObserver().addOnGlobalLayoutListener(

new OnGlobalLayoutListener() {

@Override

public void onGlobalLayout() {

getViewTreeObserver()

.removeGlobalOnLayoutListener(this);

currentPosition = pager.getCurrentItem();

scrollToChild(currentPosition, 0);

}

});

}

private void addTextTab(final int position, String title) {

TextView tab = new TextView(getContext());

tab.setText(title);

tab.setGravity(Gravity.CENTER);

tab.setSingleLine();

addTab(position, tab);

}

private void addIconTab(final int position, int resId) {

ImageButton tab = new ImageButton(getContext());

tab.setImageResource(resId);

addTab(position, tab);

}

private void addTab(final int position, View tab) {

tab.setFocusable(true);

tab.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

pager.setCurrentItem(position);

}

});

tab.setPadding(tabPadding, 0, tabPadding, 0);

tabsContainer

.addView(tab, position, shouldExpand ? expandedTabLayoutParams

defaultTabLayoutParams);

}

private void updateTabStyles() {

for (int i = 0; i < tabCount; i++) {

View v = tabsContainer.getChildAt(i);

v.setBackgroundResource(tabBackgroundResId);

if (v instanceof TextView) {

TextView tab = (TextView) v;

tab.setTextSize(TypedValue.COMPLEX_UNIT_PX, tabTextSize);

tab.setTypeface(tabTypeface, tabTypefaceStyle);

tab.setTextColor(tabTextColor);

// setAllCaps() is only available from API 14, so the upper case

// is made manually if we are on a

// pre-ICS-build

if (textAllCaps) {

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {

tab.setAllCaps(true);

} else {

tab.setText(tab.getText().toString()

.toUpperCase(locale));

}

}

if (i == selectedPosition) {

tab.setTextColor(selectedTabTextColor);

}

}

}

}

private void scrollToChild(int position, int offset) {

if (tabCount == 0) {

return;

}

int newScrollX = tabsContainer.getChildAt(position).getLeft() + offset;

if (position > 0 || offset > 0) {

newScrollX -= scrollOffset;

}

if (newScrollX != lastScrollX) {

lastScrollX = newScrollX;

scrollTo(newScrollX, 0);

}

}

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

if (isInEditMode() || tabCount == 0) {

return;

}

final int height = getHeight();

// draw underline

rectPaint.setColor(underlineColor);

canvas.drawRect(0, height - underlineHeight, tabsContainer.getWidth(),

height, rectPaint);

// draw indicator line

rectPaint.setColor(indicatorColor);

// default: line below current tab

View currentTab = tabsContainer.getChildAt(currentPosition);

float lineLeft = currentTab.getLeft();

float lineRight = currentTab.getRight();

// if there is an offset, start interpolating left and right coordinates

// between current and next tab

if (currentPositionOffset > 0f && currentPosition < tabCount - 1) {

View nextTab = tabsContainer.getChildAt(currentPosition + 1);

final float nextTabLeft = nextTab.getLeft();

final float nextTabRight = nextTab.getRight();

lineLeft = (currentPositionOffset * nextTabLeft + (1f - currentPositionOffset)

• lineLeft);

lineRight = (currentPositionOffset * nextTabRight + (1f - currentPositionOffset)

• lineRight);

}

canvas.drawRect(lineLeft, height - indicatorHeight, lineRight, height,

rectPaint);

// draw divider

dividerPaint.setColor(dividerColor);

for (int i = 0; i < tabCount - 1; i++) {

View tab = tabsContainer.getChildAt(i);

canvas.drawLine(tab.getRight(), dividerPadding, tab.getRight(),

height - dividerPadding, dividerPaint);

}

}

private class PageListener implements OnPageChangeListener {

@Override

public void onPageScrolled(int position, float positionOffset,

int positionOffsetPixels) {

currentPosition = position;

currentPositionOffset = positionOffset;

scrollToChild(position, (int) (positionOffset * tabsContainer

.getChildAt(position).getWidth()));

invalidate();

if (delegatePageListener != null) {

delegatePageListener.onPageScrolled(position, positionOffset,

positionOffsetPixels);

}

}

@Override

public void onPageScrollStateChanged(int state) {

if (state == ViewPager.SCROLL_STATE_IDLE) {

scrollToChild(pager.getCurrentItem(), 0);

}

if (delegatePageListener != null) {

delegatePageListener.onPageScrollStateChanged(state);

}

}

@Override

public void onPageSelected(int position) {

selectedPosition = position;

updateTabStyles();

if (delegatePageListener != null) {

delegatePageListener.onPageSelected(position);

}

}

}

public void setSelectedPosition(int selectedPosition) {

this.selectedPosition = selectedPosition;

}

public void setIndicatorColor(int indicatorColor) {

this.indicatorColor = indicatorColor;

invalidate();

}

public void setIndicatorColorResource(int resId) {

this.indicatorColor = getResources().getColor(resId);

invalidate();

}

public int getIndicatorColor() {

return this.indicatorColor;

}

public void setIndicatorHeight(int indicatorLineHeightPx) {

this.indicatorHeight = indicatorLineHeightPx;

invalidate();

}

public int getIndicatorHeight() {

return indicatorHeight;

}

public void setUnderlineColor(int underlineColor) {

this.underlineColor = underlineColor;

invalidate();

}

public void setUnderlineColorResource(int resId) {

this.underlineColor = getResources().getColor(resId);

invalidate();

}

public int getUnderlineColor() {

return underlineColor;

}

public void setDividerColor(int dividerColor) {

this.dividerColor = dividerColor;

invalidate();

}

public void setDividerColorResource(int resId) {

this.dividerColor = getResources().getColor(resId);

invalidate();

}

public int getDividerColor() {

return dividerColor;

}

public void setUnderlineHeight(int underlineHeightPx) {

this.underlineHeight = underlineHeightPx;

invalidate();

}

public int getUnderlineHeight() {

return underlineHeight;

}

public void setDividerPadding(int dividerPaddingPx) {

this.dividerPadding = dividerPaddingPx;

invalidate();

}

public int getDividerPadding() {

return dividerPadding;

}

public void setScrollOffset(int scrollOffsetPx) {

this.scrollOffset = scrollOffsetPx;

invalidate();

}

public int getScrollOffset() {

return scrollOffset;

}

public void setShouldExpand(boolean shouldExpand) {

this.shouldExpand = shouldExpand;

notifyDataSetChanged();

}

public boolean getShouldExpand() {

return shouldExpand;

}

public boolean isTextAllCaps() {

return textAllCaps;

}

public void setAllCaps(boolean textAllCaps) {

this.textAllCaps = textAllCaps;

}

public void setTextSize(int textSizePx) {

this.tabTextSize = textSizePx;

updateTabStyles();

}

public int getTextSize() {

return tabTextSize;

}

public void setTextColor(int textColor) {

this.tabTextColor = textColor;

updateTabStyles();

}

public void setTextColorResource(int resId) {

this.tabTextColor = getResources().getColor(resId);

updateTabStyles();

}

public int getTextColor() {

return tabTextColor;

}

public void setSelectedTextColor(int textColor) {

this.selectedTabTextColor = textColor;

updateTabStyles();

}

public void setSelectedTextColorResource(int resId) {

this.selectedTabTextColor = getResources().getColor(resId);

updateTabStyles();

}

public int getSelectedTextColor() {

return selectedTabTextColor;

}

public void setTypeface(Typeface typeface, int style) {

this.tabTypeface = typeface;

this.tabTypefaceStyle = style;

updateTabStyles();

}

public void setTabBackground(int resId) {

this.tabBackgroundResId = resId;

updateTabStyles();

}

public int getTabBackground() {

return tabBackgroundResId;

}

public void setTabPaddingLeftRight(int paddingPx) {

this.tabPadding = paddingPx;

updateTabStyles();

}

public int getTabPaddingLeftRight() {

return tabPadding;

}

@Override

public void onRestoreInstanceState(Parcelable state) {

SavedState savedState = (SavedState) state;

super.onRestoreInstanceState(savedState.getSuperState());