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.example.fragmentdemo.views; import java.util.Locale; import org.xmlpull.v1.XmlPullParser; import com.example.fragmentdemo.R; import android.app.Activity; import android.content.Context; import android.content.res.ColorStateList; 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.Parcel; import android.os.Parcelable; import android.support.v4.view.PagerAdapter; 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.ImageView.ScaleType; import android.widget.LinearLayout; import android.widget.TextView; public class PagerSlidingTabStrip extends HorizontalScrollView implements PageIndicator { public interface IconTabProvider { public int getPageIconResId(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 currentPosition = 0; private int selectedPosition = 0; 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 float dividerWidth = 0.5f; 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; private int iLinePadding; private int iIconHeight; 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 = 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(this); notifyDataSetChanged(); } public void setOnPageChangeListener(OnPageChangeListener listener) { this.delegatePageListener = listener; } public void notifyDataSetChanged() { tabsContainer.removeAllViews(); PagerAdapter adapter = pager.getAdapter(); tabCount = adapter.getCount(); IconPagerAdapter iconAdapter = null; int iLayoutResId = 0; int iTextId = 0; int iIconLocation = 0; if (adapter instanceof IconPagerAdapter) { iconAdapter = (IconPagerAdapter) adapter; iLayoutResId = iconAdapter.getLayoutResId(); iTextId = iconAdapter.getTextResId(); iIconLocation = iconAdapter.getIconLocation(); } for (int i = 0; i < tabCount; i++) { CharSequence title = adapter.getPageTitle(i); int iconResId = 0; if (iconAdapter != null) { iconResId = iconAdapter.getIconResId(i); } addTab(i, title, iconResId, iLayoutResId, iTextId, iIconLocation); // 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 addTab(final int position, CharSequence title, int iconResId, int iLayoutResId, int iTextId, int iIconLocation) { // final View tabView = ((Activity) getContext()).getLayoutInflater() // .inflate(iLayoutResId, null); // TextView tab_text_textview = (TextView) // tabView.findViewById(iTextId); // tab_text_textview.setText(title); LinearLayout tabView = new LinearLayout(getContext()); tabView.setGravity(Gravity.CENTER); TextView tab_text_textview = new TextView(getContext()); tab_text_textview.setId(position); tab_text_textview.setText(title); tab_text_textview.setGravity(Gravity.CENTER_VERTICAL); tab_text_textview.setSingleLine(); // tab_text_textview.setTextColor(tabTextColor); // tab_text_textview.setTextColor(getResources().getColor(R.color.indicator_tab_main_text_color)); XmlPullParser xrp = getResources().getXml(tabTextColor); try { ColorStateList csl = ColorStateList.createFromXml(getResources(), xrp); if (tab_text_textview != null) { tab_text_textview.setTextColor(csl); } } catch (Exception e) { } tab_text_textview.setTextSize(TypedValue.COMPLEX_UNIT_PX, tabTextSize); tab_text_textview.setTypeface(tabTypeface, tabTypefaceStyle); LinearLayout.LayoutParams lpText = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); if (iconResId != 0) { // tab_text_textview.setCompoundDrawablesWithIntrinsicBounds( // iconResId, 0, 0, 0); // Drawable mDrawable = ((Activity) getContext()).getResources() // .getDrawable(iconResId); // mDrawable.setBounds(0, 0, mDrawable.getMinimumWidth(), // mDrawable.getMinimumHeight()); int iPandding = (int) ((Activity) getContext()).getResources().getDimension(R.dimen.common_padding); ImageView icon = new ImageView(getContext()); icon.setImageResource(iconResId); icon.setScaleType(ScaleType.CENTER_INSIDE); LinearLayout.LayoutParams lpImage = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, iIconHeight); switch (iIconLocation) { case 1: // tab_text_textview.setCompoundDrawables(mDrawable, null, null, // null); tabView.setOrientation(LinearLayout.HORIZONTAL); // tabView.setGravity(Gravity.CENTER_VERTICAL); tabView.addView(icon, lpImage); lpText.leftMargin = iPandding; tabView.addView(tab_text_textview, lpText); break; case 2: // tab_text_textview.setCompoundDrawables(null, mDrawable, null, // null); tabView.setOrientation(LinearLayout.VERTICAL); // tabView.setGravity(Gravity.CENTER_HORIZONTAL); tabView.addView(icon, lpImage); lpText.topMargin = iPandding; tabView.addView(tab_text_textview, lpText); break; case 3: // tab_text_textview.setCompoundDrawables(null, null, mDrawable, // null); tabView.setOrientation(LinearLayout.HORIZONTAL); // tabView.setGravity(Gravity.CENTER_VERTICAL); tabView.addView(tab_text_textview, lpText); lpImage.leftMargin = iPandding; tabView.addView(icon, lpImage); break; case 4: // tab_text_textview.setCompoundDrawables(null, null, null, // mDrawable); tabView.setOrientation(LinearLayout.VERTICAL); // tabView.setGravity(Gravity.CENTER_HORIZONTAL); tabView.addView(tab_text_textview, lpText); lpImage.topMargin = iPandding; tabView.addView(icon, lpImage); break; default: // tab_text_textview.setCompoundDrawables(mDrawable, null, null, // null); tabView.setOrientation(LinearLayout.HORIZONTAL); // tabView.setGravity(Gravity.CENTER_VERTICAL); tabView.addView(icon, lpImage); lpText.leftMargin = iPandding; tabView.addView(tab_text_textview, lpText); break; } // tab_text_textview // .setCompoundDrawablePadding((int) ((Activity) getContext()) // .getResources() // .getDimension(R.dimen.common_padding)); } else { tabView.addView(tab_text_textview, lpText); } tabView.setFocusable(true); tabView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { pager.setCurrentItem(position); } }); // tab_text_textview.setPadding(tabPadding, 0, tabPadding, 0); tabsContainer.addView(tabView, position, shouldExpand ? expandedTabLayoutParams : defaultTabLayoutParams); } private void updateTabStyles() { if (selectedPosition > tabCount) { selectedPosition = tabCount - 1; } setCurrentItem(selectedPosition); // 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() + iLinePadding; 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() + iLinePadding; 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 setLinePadding(int linePadding) { this.iLinePadding = linePadding; } public int getLinePadding() { return iLinePadding; } 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; } public void setIconHeight(int iconHeight) { this.iIconHeight = iconHeight; } @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 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]; } }; } @Override public void onPageScrollStateChanged(int state) { if (delegatePageListener != null) { delegatePageListener.onPageScrollStateChanged(state); } } @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 onPageSelected(int position) { // setCurrentItem(position); selectedPosition = position; updateTabStyles(); if (delegatePageListener != null) { delegatePageListener.onPageSelected(position); } } @Override public void setViewPager(ViewPager view, int initialPosition) { // TODO Auto-generated method stub } @Override public void setCurrentItem(int item) { if (pager == null) { throw new IllegalStateException("ViewPager has not been bound."); } selectedPosition = item; pager.setCurrentItem(item); final int tabCount = tabsContainer.getChildCount(); for (int i = 0; i < tabCount; i++) { final View child = tabsContainer.getChildAt(i); final boolean isSelected = (i == item); child.setSelected(isSelected); // if (isSelected) { // animateToTab(item); // } } } }