Java tutorial
package net.coding.program.third;/* * 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. */ 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.annotation.ColorRes; 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.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.ViewTreeObserver.OnGlobalLayoutListener; import android.widget.HorizontalScrollView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import com.astuetz.pagerslidingtabstrip.R; import com.nostra13.universalimageloader.core.ImageLoader; import net.coding.program.common.Global; import net.coding.program.common.ImageLoadTool; import java.util.Locale; public class MyPagerSlidingTabStrip extends HorizontalScrollView { // @formatter:off private static final int[] ATTRS = new int[] { android.R.attr.textSize, android.R.attr.textColor }; private final PageListener pageListener = new PageListener(); // @formatter:on public OnPageChangeListener delegatePageListener; private LinearLayout.LayoutParams defaultTabLayoutParams; private LinearLayout.LayoutParams expandedTabLayoutParams; private LinearLayout tabsContainer; private ViewPager pager; private int tabCount; private int currentPosition = 0; private float currentPositionOffset = 0f; private Paint rectPaint; private Paint dividerPaint; private int indicatorColor; private int underlineColor; private int dividerColor; private boolean shouldExpand = false; private boolean textAllCaps = false; private int scrollOffset = 52; private int indicatorHeight = 3; private int underlineHeight = 1; private int dividerPadding = 12; private int tabPadding = 0; private int dividerWidth = 1; private int tabTextSize = 12; private int tabTextColor; private Typeface tabTypeface = null; private int tabTypefaceStyle = Typeface.BOLD; private int lastScrollX = 0; private int tabBackgroundResId; private Locale locale; private int iconPadding = 21; // 5 + (44 - 12) / 2 ?? 12dp private int myPaddingLeft = 0; private LayoutInflater mInflater; private int myFirstExtraPdddingLeft = 0; public MyPagerSlidingTabStrip(Context context) { this(context, null); } public MyPagerSlidingTabStrip(Context context, AttributeSet attrs) { this(context, attrs, 0); } public MyPagerSlidingTabStrip(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); myFirstExtraPdddingLeft = getResources() .getDimensionPixelSize(net.coding.program.R.dimen.my_pager_sliding_tab_strip_first_padding_left); myPaddingLeft = getResources().getDimensionPixelSize(net.coding.program.R.dimen.my_pager_sliding_tab_strip); myPaddingLeft = 0; 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); iconPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, iconPadding, dm); tabTextColor = getColor(net.coding.program.R.color.font_2); // get system attrs (android:textSize and android:textColor) // TypedArray a = context.obtainStyledAttributes(attrs, ATTRS); // // tabTextSize = a.getDimensionPixelSize(0, tabTextSize); // tabTextColor = a.getColor(R.styleable., tabTextColor); // // a.recycle(); // get custom attrs TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PagerSlidingTabStrip); indicatorColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsIndicatorColor, getColor(net.coding.program.R.color.select_1)); underlineColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsUnderlineColor, getColor(net.coding.program.R.color.divide_line)); dividerColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsDividerColor, getColor(net.coding.program.R.color.white)); 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, getColor(net.coding.program.R.color.transparent)); 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; } } private int getColor(@ColorRes int color) { return getResources().getColor(color); } 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++) { if (pager.getAdapter() instanceof IconTabProvider) { addIconTab(i, ((IconTabProvider) pager.getAdapter()).getPageIconUrl(i)); } else { addTextTab(i, pager.getAdapter().getPageTitle(i).toString()); } } 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); } }); } 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); } public void setLayoutInflater(LayoutInflater inflater) { mInflater = inflater; } private void addIconTab(final int position, String url) { // ImageButton tab = new ImageButton(getContext()); // // tab.setImageResource(resId); // // addTab(position, tab); View v = mInflater.inflate(net.coding.program.R.layout.imageview_head, tabsContainer, false); ImageView head = (ImageView) v.findViewById(net.coding.program.R.id.head); if (url.isEmpty()) { head.setImageResource(net.coding.program.R.drawable.icon_all_task); ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) head.getLayoutParams(); lp.leftMargin += myFirstExtraPdddingLeft; head.setLayoutParams(lp); } else { ImageLoader.getInstance().displayImage(Global.makeSmallUrl(head, url), head, ImageLoadTool.options); } addTab(position, v); } 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); tabsContainer.addView(tab, position); // if (position == 0) { // ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) tab.getLayoutParams(); // lp.leftMargin += myFirstExtraPdddingLeft; // tab.setLayoutParams(lp); // } // int count = tabCount = pager.getAdapter().getCount(); // if (position == 0) { // View v = tab.findViewById(net.coding.program.R.id.layout); // FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) v.getLayoutParams(); // lp.leftMargin += iconPadding; // v.setLayoutParams(lp); // } else if (position == count - 1) { // View v = tab.findViewById(net.coding.program.R.id.layout); // FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) v.getLayoutParams(); // lp.rightMargin += iconPadding; // v.setLayoutParams(lp); // } } 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)); } } } } } 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 (currentPosition == 0) { lineLeft += myFirstExtraPdddingLeft; } // 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(); // if (currentPosition == 0) { // lineLeft -= myFirstExtraPdddingLeft; // } lineLeft = (currentPositionOffset * nextTabLeft + (1f - currentPositionOffset) * lineLeft); lineRight = (currentPositionOffset * nextTabRight + (1f - currentPositionOffset) * lineRight); } // float myLeft = lineLeft + iconPadding + myPaddingLeft; // if (currentPosition == 0) { // myLeft += myFirstExtraPdddingLeft; // } // float myRight = lineRight - iconPadding + myPaddingLeft; // if (currentPosition == 0) { // myLeft += iconPadding; // } // if (currentPosition == (tabCount - 1)) { // myRight -= iconPadding; // } canvas.drawRect(lineLeft + iconPadding, height - indicatorHeight, lineRight - iconPadding, 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); } } public void setIndicatorColorResource(int resId) { this.indicatorColor = getResources().getColor(resId); invalidate(); } public int getIndicatorColor() { return this.indicatorColor; } public void setIndicatorColor(int indicatorColor) { this.indicatorColor = indicatorColor; invalidate(); } public int getIndicatorHeight() { return indicatorHeight; } public void setIndicatorHeight(int indicatorLineHeightPx) { this.indicatorHeight = indicatorLineHeightPx; invalidate(); } public void setUnderlineColorResource(int resId) { this.underlineColor = getResources().getColor(resId); invalidate(); } public int getUnderlineColor() { return underlineColor; } public void setUnderlineColor(int underlineColor) { this.underlineColor = underlineColor; invalidate(); } public void setDividerColorResource(int resId) { this.dividerColor = getResources().getColor(resId); invalidate(); } public int getDividerColor() { return dividerColor; } public void setDividerColor(int dividerColor) { this.dividerColor = dividerColor; invalidate(); } public int getUnderlineHeight() { return underlineHeight; } public void setUnderlineHeight(int underlineHeightPx) { this.underlineHeight = underlineHeightPx; invalidate(); } public int getDividerPadding() { return dividerPadding; } public void setDividerPadding(int dividerPaddingPx) { this.dividerPadding = dividerPaddingPx; invalidate(); } public int getScrollOffset() { return scrollOffset; } public void setScrollOffset(int scrollOffsetPx) { this.scrollOffset = scrollOffsetPx; invalidate(); } public boolean getShouldExpand() { return shouldExpand; } public void setShouldExpand(boolean shouldExpand) { this.shouldExpand = shouldExpand; requestLayout(); } public boolean isTextAllCaps() { return textAllCaps; } public void setAllCaps(boolean textAllCaps) { this.textAllCaps = textAllCaps; } public int getTextSize() { return tabTextSize; } public void setTextSize(int textSizePx) { this.tabTextSize = textSizePx; updateTabStyles(); } public void setTextColorResource(int resId) { this.tabTextColor = getResources().getColor(resId); updateTabStyles(); } public int getTextColor() { return tabTextColor; } public void setTextColor(int textColor) { this.tabTextColor = textColor; updateTabStyles(); } public void setTypeface(Typeface typeface, int style) { this.tabTypeface = typeface; this.tabTypefaceStyle = style; updateTabStyles(); } public int getTabBackground() { return tabBackgroundResId; } public void setTabBackground(int resId) { this.tabBackgroundResId = resId; } public int getCurrentPosition() { return currentPosition; } public int getTabPaddingLeftRight() { return tabPadding; } public void setTabPaddingLeftRight(int paddingPx) { this.tabPadding = paddingPx; updateTabStyles(); } @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; } public interface IconTabProvider { String getPageIconUrl(int position); } static class SavedState extends BaseSavedState { 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]; } }; 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); } } 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) { if (delegatePageListener != null) { delegatePageListener.onPageSelected(position); } } } }