Java tutorial
/* * Copyright (C) 2013 Andreas Stuetz <andreas.stuetz@gmail.com> * * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * specific language governing permissions and limitations under the License. */ package com.cc.custom.uikit; import android.annotation.SuppressLint; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Paint.Style; import android.graphics.Typeface; import android.os.Build; import android.os.Parcel; import android.os.Parcelable; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.util.TypedValue; import android.view.Gravity; import android.view.View; import android.view.ViewTreeObserver.OnGlobalLayoutListener; import android.widget.HorizontalScrollView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import com.cc.custom.R; import java.util.Locale; public class PagerSlidingTabStrip extends HorizontalScrollView { public interface TabTitleProvider { // title public int getPageIconResId(int position); // View title public View getPageTabView(int position); // charsequence title public CharSequence getPageTabText(int position); } // @formatter:off private static final int[] ATTRS = new int[] { android.R.attr.textSize, android.R.attr.textColor }; // @formatter:on private LinearLayout.LayoutParams defaultTabLayoutParams; private LinearLayout.LayoutParams expandedTabLayoutParams; private final PageListener pageListener = new PageListener(); public OnPageChangeListener delegatePageListener; private LinearLayout tabsContainer; private ViewPager pager; private int tabCount; private int firstPosition = 0; private int lastSelectedPosition = -1; private int selectedPosition = 0; private float firstPositionOffset = 0f; private Paint rectPaint; private Paint dividerPaint; private int indicatorColor = 0xFF007BFF; private int underlineColor = 0xFFDDDDDD; private int dividerColor = 0xFFDDDDDD; private boolean shouldExpand = false; private boolean textAllCaps = false; private float scrollOffset = 26; private float indicatorHeight = 1; private float indicatorPadding = 10; private float underlineHeight = 0.5f; private float dividerPadding = 0; private float tabPadding = 0; private float dividerWidth = 0.5f; private float tabTextSize = 14; private int tabTextColor = 0xFF666666; private int tabSelectedTextColor = 0xFF007BFF; private Typeface tabTypeface = null; private int tabTypefaceStyle = Typeface.NORMAL; private int lastScrollX = 0; private int tabBackgroundResId = 0; private int tabSelectedBackgroundResId = 0; 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); DisplayMetrics dm = getResources().getDisplayMetrics(); scrollOffset = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, scrollOffset, dm); indicatorHeight = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, indicatorHeight, dm); underlineHeight = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, underlineHeight, dm); dividerPadding = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerPadding, dm); indicatorPadding = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, indicatorPadding, dm); tabPadding = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabPadding, dm); dividerWidth = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerWidth, dm); tabTextSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, tabTextSize, dm); // get custom attrs TypedArray 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); tabTextColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsTabTextColor, tabTextColor); tabSelectedTextColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsTabSelectedTextColor, tabSelectedTextColor); tabTextSize = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsTabTextSize, (int) tabTextSize); indicatorHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsIndicatorHeight, (int) indicatorHeight); underlineHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsUnderlineHeight, (int) underlineHeight); dividerPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsDividerPadding, (int) dividerPadding); indicatorPadding = a.getDimensionPixelOffset(R.styleable.PagerSlidingTabStrip_pstIndicatorPadding, (int) indicatorPadding); tabPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsTabPaddingLeftRight, (int) tabPadding); tabBackgroundResId = a.getResourceId(R.styleable.PagerSlidingTabStrip_pstsTabBackground, tabBackgroundResId); tabSelectedBackgroundResId = a.getResourceId(R.styleable.PagerSlidingTabStrip_pstsTabSelectedBackgrground, tabSelectedBackgroundResId); shouldExpand = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsShouldExpand, shouldExpand); scrollOffset = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsScrollOffset, (int) scrollOffset); textAllCaps = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsTextAllCaps, textAllCaps); a.recycle(); tabsContainer = new LinearLayout(context); tabsContainer.setOrientation(LinearLayout.HORIZONTAL); tabsContainer.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); addView(tabsContainer); 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.addOnPageChangeListener(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; i++) { if (pager.getAdapter() instanceof TabTitleProvider) { // tabtitleprovider ? if (((TabTitleProvider) pager.getAdapter()).getPageTabText(i) != null) { // charsequence addTextTab(i, ((TabTitleProvider) pager.getAdapter()).getPageTabText(i)); continue; } else if (((TabTitleProvider) pager.getAdapter()).getPageTabView(i) != null) { // View addTab(i, ((TabTitleProvider) pager.getAdapter()).getPageTabView(i)); continue; } else if (((TabTitleProvider) pager.getAdapter()).getPageIconResId(i) > 0) { // icon addIconTab(i, ((TabTitleProvider) pager.getAdapter()).getPageIconResId(i)); continue; } } // tabtitleprovider ?, adapter addTextTab(i, pager.getAdapter().getPageTitle(i)); } updateTabStyles(); getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() { @SuppressWarnings("deprecation") @SuppressLint("NewApi") @Override public void onGlobalLayout() { if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) { getViewTreeObserver().removeGlobalOnLayoutListener(this); } else { getViewTreeObserver().removeOnGlobalLayoutListener(this); } firstPosition = pager.getCurrentItem(); scrollToChild(firstPosition, 0); View tab = tabsContainer.getChildAt(firstPosition); if (tab instanceof TextView) { ((TextView) tab).setTextColor(tabSelectedTextColor); } if (tabSelectedBackgroundResId > 0) { tab.setBackgroundResource(tabSelectedBackgroundResId); } } }); } private void addTextTab(final int position, CharSequence 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) { ImageView tab = new ImageView(getContext()); tab.setImageResource(resId); tab.setScaleType(ImageView.ScaleType.CENTER_INSIDE); 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((int) tabPadding, 0, (int) tabPadding, 0); tabsContainer.addView(tab, position, shouldExpand ? expandedTabLayoutParams : defaultTabLayoutParams); } private void updateTabStyles() { for (int i = 0; i < tabCount; i++) { View v = tabsContainer.getChildAt(i); if (tabSelectedBackgroundResId > 0) { 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)); } } } } } 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(); View currentTab = tabsContainer.getChildAt(firstPosition); // draw indicator line rectPaint.setColor(indicatorColor); // default: line below current tab 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 (firstPositionOffset > 0f && firstPosition < tabCount - 1) { View nextTab = tabsContainer.getChildAt(firstPosition + 1); final float nextTabLeft = nextTab.getLeft(); final float nextTabRight = nextTab.getRight(); lineLeft = (firstPositionOffset * nextTabLeft + (1f - firstPositionOffset) * lineLeft); lineRight = (firstPositionOffset * nextTabRight + (1f - firstPositionOffset) * lineRight); } canvas.drawRect(lineLeft + indicatorPadding, height - indicatorHeight, lineRight - indicatorPadding, height, rectPaint); // draw underline rectPaint.setColor(underlineColor); canvas.drawRect(0, height - underlineHeight, tabsContainer.getWidth(), 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) { firstPosition = position; firstPositionOffset = positionOffset; // scroll to intented tab scrollToChild(position, (int) (positionOffset * tabsContainer.getChildAt(position).getWidth())); // redraw indicator , divider and line invalidate(); if (delegatePageListener != null) { delegatePageListener.onPageScrolled(position, positionOffset, positionOffsetPixels); } } @Override public void onPageScrollStateChanged(int state) { if (delegatePageListener != null) { delegatePageListener.onPageScrollStateChanged(state); } } @Override public void onPageSelected(int position) { lastSelectedPosition = selectedPosition; selectedPosition = position; // tab View currentTab = tabsContainer.getChildAt(selectedPosition); if (currentTab instanceof TextView) { ((TextView) currentTab).setTextColor(tabSelectedTextColor); } if (tabSelectedBackgroundResId > 0) { currentTab.setBackgroundResource(tabSelectedBackgroundResId); } View lastTab = tabsContainer.getChildAt(lastSelectedPosition); if (lastTab instanceof TextView) { ((TextView) lastTab).setTextColor(tabTextColor); } if (tabBackgroundResId > 0) { lastTab.setBackgroundResource(tabBackgroundResId); } if (delegatePageListener != null) { delegatePageListener.onPageSelected(position); } } } public void setTabTextColor(int tabTextColor) { this.tabTextColor = tabTextColor; invalidate(); } public int getTabTextColor() { return tabTextColor; } public void setTabSelectedTextColor(int tabSelectedTextColor) { this.tabSelectedTextColor = tabSelectedTextColor; invalidate(); } public int getTabSelectedTextColor() { return tabSelectedTextColor; } public void setTabBackgroundResId(int tabBackgroundResId) { this.tabBackgroundResId = tabBackgroundResId; invalidate(); } public int getTabBackgroundResId() { return tabBackgroundResId; } public void setTabSelectedBackgroundResId(int tabSelectedBackgroundResId) { this.tabSelectedBackgroundResId = tabSelectedBackgroundResId; invalidate(); } public int getTabSelectedBackgroundResId() { return tabSelectedBackgroundResId; } public void setIndicatorColor(int indicatorColor) { this.indicatorColor = indicatorColor; invalidate(); } public void setTabTextSize(int tabTextSize) { this.tabTextSize = tabTextSize; 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 float getIndicatorHeight() { return indicatorHeight; } public void setIndicatorPadding(int indicatorPadding) { this.indicatorPadding = indicatorPadding; invalidate(); } public float getIndicatorPadding() { return indicatorPadding; } 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 float getUnderlineHeight() { return underlineHeight; } public void setDividerPadding(int dividerPaddingPx) { this.dividerPadding = dividerPaddingPx; invalidate(); } public float getDividerPadding() { return dividerPadding; } public void setScrollOffset(int scrollOffsetPx) { this.scrollOffset = scrollOffsetPx; invalidate(); } public float getScrollOffset() { return scrollOffset; } public void setShouldExpand(boolean shouldExpand) { this.shouldExpand = shouldExpand; requestLayout(); } 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 float 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 setTypeface(Typeface typeface, int style) { this.tabTypeface = typeface; this.tabTypefaceStyle = style; updateTabStyles(); } public void setTabBackground(int resId) { this.tabBackgroundResId = resId; } public int getTabBackground() { return tabBackgroundResId; } public void setTabPaddingLeftRight(int paddingPx) { this.tabPadding = paddingPx; updateTabStyles(); } public float getTabPaddingLeftRight() { return tabPadding; } @Override public void onRestoreInstanceState(Parcelable state) { SavedState savedState = (SavedState) state; super.onRestoreInstanceState(savedState.getSuperState()); firstPosition = savedState.firstPosition; requestLayout(); } @Override public Parcelable onSaveInstanceState() { Parcelable superState = super.onSaveInstanceState(); SavedState savedState = new SavedState(superState); savedState.firstPosition = firstPosition; return savedState; } static class SavedState extends BaseSavedState { int firstPosition; public SavedState(Parcelable superState) { super(superState); } private SavedState(Parcel in) { super(in); firstPosition = in.readInt(); } @Override public void writeToParcel(Parcel dest, int flags) { super.writeToParcel(dest, flags); dest.writeInt(firstPosition); } public static final Creator<SavedState> CREATOR = new Creator<SavedState>() { @Override public SavedState createFromParcel(Parcel in) { return new SavedState(in); } @Override public SavedState[] newArray(int size) { return new SavedState[size]; } }; } }