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.yaozu.object.widget; import android.annotation.SuppressLint; import android.annotation.TargetApi; 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.yaozu.object.R; import java.util.Locale; /** * ?View */ @TargetApi(Build.VERSION_CODES.CUPCAKE) public class PagerSlidingTabStrip extends HorizontalScrollView { private final String TAG = this.getClass().getSimpleName(); // @formatter:off private static final int[] ATTRS = new int[] { android.R.attr.textSize, android.R.attr.textColor }; // @formatter:on private final LinearLayout.LayoutParams defaultTabLayoutParams; private final LinearLayout.LayoutParams expandedTabLayoutParams; private final PageListener pageListener = new PageListener(); private OnPageChangeListener delegatePageListener; private final LinearLayout tabsContainer; private ViewPager pager; private int tabCount; private int currentPosition = 0; private int currentSelectPosition = 0;//?fragment??position private float currentPositionOffset = 0f; private final Paint rectPaint; private int indicatorColor = 0xFF666666; private int underlineColor = 0x1A000000; private int tabTextColorNormal = 0xFF323232; // 0x9a9a9a; private int tabTextColorSelected = 0xc22727; private int dividerColor = 0x1A000000; private boolean shouldExpand = false; private boolean textAllCaps = true; private int currentDividerWidth = 0; private int mScrollOffset = 0; private int indicatorHeight = 8; private int underlineHeight = 2; private int dividerPadding = 12; private int tabPadding = 24; private int tabPaddingVertical = 15; private final int tabPaddingTop = 5; private final int tabPaddingBottom = 5; private int expandViewWidth = 20; // private int dividerWidth = 1; private int dividerWidth = 0; // if you dont want a divider set its width to zero private int tabTextSize = 16; // private int tabTextColor = 0xFF666666; private int tabTextColor = 0xFF323232; // private Typeface tabTypeface = null; // private int tabTypefaceStyle = Typeface.BOLD; private int tabTypefaceStyle = Typeface.NORMAL; private int lastScrollX = 0; private int tabBackgroundResId = 0;// = 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)); tabsContainer.setGravity(Gravity.CENTER_VERTICAL); // ? addView(tabsContainer); DisplayMetrics dm = getResources().getDisplayMetrics(); //scrollOffset = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, scrollOffset, dm); mScrollOffset = dm.widthPixels / 2; 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); // add by hangl begin tabPaddingVertical = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabPaddingVertical, dm); // add by hangl end dividerWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerWidth, dm); tabTextSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabTextSize, dm); // change sp to dp // get system attrs (android:textSize and android:textColor) TypedArray a = context.obtainStyledAttributes(attrs, ATTRS); tabTextSize = a.getDimensionPixelSize(0, tabTextSize); a.recycle(); // get custom attrs a = context.obtainStyledAttributes(attrs, R.styleable.PagerSlidingTabStrip); tabTextColor = a.getColor(R.styleable.PagerSlidingTabStrip_tabTextColor, tabTextColor); indicatorColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsIndicatorColor, indicatorColor); underlineColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsUnderlineColor, underlineColor); dividerColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsDividerColor, dividerColor); tabTextSize = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_tabTextSize, tabTextSize); // add by hangl begin tabTextColorNormal = a.getColor(R.styleable.PagerSlidingTabStrip_pstsTextNormalColor, tabTextColorNormal); tabTextColorSelected = a.getColor(R.styleable.PagerSlidingTabStrip_pstsTextSelectedColor, tabTextColorSelected); tabPaddingVertical = a.getDimensionPixelOffset(R.styleable.PagerSlidingTabStrip_pstsTabPaddingVertical, tabPaddingVertical); expandViewWidth = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsExpandViewWidth, expandViewWidth); // add by hangl end 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); mScrollOffset = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsScrollOffset, mScrollOffset); textAllCaps = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsTextAllCaps, textAllCaps); a.recycle(); rectPaint = new Paint(); rectPaint.setAntiAlias(true); rectPaint.setStyle(Style.FILL); Paint 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; i++) { addTextTab(i, pager.getAdapter().getPageTitle(i).toString()); } // add by hangl if (!shouldExpand && expandViewWidth != 0) { ImageView spaceView = new ImageView(getContext()); LinearLayout.LayoutParams llp = new LinearLayout.LayoutParams(expandViewWidth, LinearLayout.LayoutParams.MATCH_PARENT); tabsContainer.addView(spaceView, tabCount, llp); } 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); } currentPosition = pager.getCurrentItem(); scrollToChild(currentPosition, 0); } }); selectTab(pager.getCurrentItem()); // focus current selected tab } private void addTextTab(final int position, String title) { TextView tab = new TextView(getContext()); tab.setContentDescription(title); tab.setText(title); tab.setGravity(Gravity.CENTER); tab.setSingleLine(); tab.setTextColor(tabTextColorNormal); // add by hangl addTab(position, tab); } private void addTab(final int position, View tab) { tab.setFocusable(true); tab.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if (viewpagerStateListener != null) { viewpagerStateListener.onPageScrollStateChanged(1); } pager.setCurrentItem(position, false); } }); tab.setPadding(tabPadding, tabPaddingTop, tabPadding, tabPaddingBottom); 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); tab.setText(tab.getText().toString()); // if (textAllCaps) { // setAllCaps() is only available from API 14, so the upper case is made manually if we are on a pre-ICS-build // 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; int scrollOffset = mScrollOffset - currentDividerWidth / 2; 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 // 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); currentDividerWidth = (int) (lineRight - lineLeft); } rectPaint.setColor(indicatorColor); canvas.drawRect(lineLeft, height - indicatorHeight, lineRight, height, rectPaint); // I dont want divider so delete code under :hangl // 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) { if (tabsContainer.getChildAt(position) == null) { return; } 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); } invalidate(); if (delegatePageListener != null) { delegatePageListener.onPageScrollStateChanged(state); } } @Override public void onPageSelected(int position) { selectTab(position); currentSelectPosition = position; if (delegatePageListener != null) { delegatePageListener.onPageSelected(position); } } } /** * Runs through all tabs and sets if they are currently selected. * * @param position The position of the currently selected tab. */ private void selectTab(int position) { for (int i = 0; i < tabsContainer.getChildCount(); i++) { View childView = tabsContainer.getChildAt(i); if (childView instanceof TextView) { CharSequence text = ((TextView) childView).getText(); if (i != position) { ((TextView) childView).setTextColor(tabTextColorNormal); childView.setContentDescription(text); } else { ((TextView) childView).setTextColor(tabTextColorSelected); childView.setContentDescription("(" + text + ")"); } } } } public int getCurrentPosition() { return currentPosition; } public int getCurrentSelectPosition() { return currentSelectPosition; } 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.mScrollOffset = scrollOffsetPx; invalidate(); } public int getScrollOffset() { return mScrollOffset; } 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 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 setTypeface(Typeface typeface, int style) { this.tabTypeface = typeface; this.tabTypefaceStyle = style; updateTabStyles(); } private ViewPager.OnPageChangeListener viewpagerStateListener; public void setViewPagerStateListener(ViewPager.OnPageChangeListener viewpagerStateListener) { this.viewpagerStateListener = viewpagerStateListener; } public void setTabBackground(int resId) { this.tabBackgroundResId = resId; } 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()); currentPosition = savedState.currentPosition; requestLayout(); } @Override public Parcelable onSaveInstanceState() { Parcelable superState = super.onSaveInstanceState(); SavedState savedState = new SavedState(superState); savedState.currentPosition = currentPosition; return savedState; } static class SavedState extends BaseSavedState { int currentPosition; public SavedState(Parcelable superState) { super(superState); } private SavedState(Parcel in) { super(in); currentPosition = in.readInt(); } @Override public void writeToParcel(Parcel dest, int flags) { super.writeToParcel(dest, flags); dest.writeInt(currentPosition); } 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]; } }; } }