Java tutorial
/* * Copyright (C) 2013 The Android Open Source Project * * 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 org.heaven7.core.view; import android.content.Context; import android.graphics.Typeface; import android.os.Build; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.util.AttributeSet; import android.util.TypedValue; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewTreeObserver; import android.widget.HorizontalScrollView; import android.widget.TextView; import java.util.ArrayList; import java.util.List; /** * To be used with ViewPager to provide a tab indicator component which give constant feedback as to * the user's scroll progress. * <p> * To use the component, simply add it to your view hierarchy. Then in your * {@link android.app.Activity} or {@link android.support.v4.app.Fragment} call * {@link #setViewPager(ViewPager)} providing it the ViewPager this layout is being used for. * <p> * The colors can be customized in two ways. The first and simplest is to provide an array of colors * via {@link #setSelectedIndicatorColors(int...)} and {@link #setDividerColors(int...)}. The * alternative is via the {@link TabColorizer} interface which provides you complete control over * which color is used for any individual position. * <p> * The views used as tabs can be customized by calling {@link #setCustomTabView(int, int)}, * providing the layout ID of your custom layout. */ public class SlidingTabLayout extends HorizontalScrollView { /** * Allows complete control over the colors drawn in the tab layout. Set with * {@link #setCustomTabColorizer(TabColorizer)}. */ public interface TabColorizer { /** * @param position the position * @return return the color of the indicator used when {@code position} is selected. */ int getIndicatorColor(int position); /**@param position the position * @return return the color of the divider drawn to the right of {@code position}. */ int getDividerColor(int position); } public static abstract class AbsTabColorizer implements TabColorizer { private final Context context; public AbsTabColorizer(Context context) { this.context = context; } @Override public int getIndicatorColor(int position) { return context.getResources().getColor(getIndicatorColorRes(position)); } protected abstract int getIndicatorColorRes(int position); protected abstract int getDividerColorRes(int position); @Override public int getDividerColor(int position) { return context.getResources().getColor(getDividerColorRes(position)); } } private static final int TITLE_OFFSET_DIPS = 24; private static final int TAB_VIEW_PADDING_DIPS = 16; private static final int TAB_VIEW_TEXT_SIZE_SP = 12; private int mTitleOffset; private int mTabViewLayoutId; private int mTabViewTextViewId; private ViewPager mViewPager; private ViewPager.OnPageChangeListener mViewPagerPageChangeListener; private final SlidingTabStrip mTabStrip; private List<TextView> mTitleTextViews; private OnTabListener mInternalTabListener; private OnInitTitleListener mInitTitleListener; private OnPopulateListener mPopulateListener; private int mSelectTextColor; private int mUnSelectTextColor; /** the select position */ private int mSelectPosition; public SlidingTabLayout(Context context) { this(context, null); } public SlidingTabLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SlidingTabLayout(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // Disable the Scroll Bar setHorizontalScrollBarEnabled(false); // Make sure that the Tab Strips fills this View setFillViewport(true); mTitleOffset = (int) (TITLE_OFFSET_DIPS * getResources().getDisplayMetrics().density); mTabStrip = new SlidingTabStrip(context); setOnTabListener(mTabStrip); addView(mTabStrip, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); } public void setSplitWidthEquality(boolean splitEquality) { //this.mSplitEquality = splitEquality; if (splitEquality) { mTabStrip.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() { @Override public boolean onPreDraw() { //let child split width for (int i = 0, size = mTabStrip.getChildCount(); i < size; i++) { mTabStrip.getChildAt(i).getLayoutParams().width = getWidth() / size; } mTabStrip.getViewTreeObserver().removeOnPreDrawListener(this); return true; } }); } } public OnPopulateListener getPopulateListener() { return mPopulateListener; } public void setOnPopulateListener(OnPopulateListener mPopulateListener) { this.mPopulateListener = mPopulateListener; } public void toogleSelect(int position) { if (mSelectPosition == position) return; mSelectPosition = position; if (mTitleTextViews == null) { for (int i = 0, size = mTabStrip.getChildCount(); i < size; i++) { ((TextView) mTabStrip.getChildAt(i)) .setTextColor(position == i ? mSelectTextColor : mUnSelectTextColor); } } else { for (int i = 0, size = mTitleTextViews.size(); i < size; i++) { mTitleTextViews.get(i).setTextColor(position == i ? mSelectTextColor : mUnSelectTextColor); } } } public void setSelectIndicatorHeight(int height) { mTabStrip.mSelectedIndicatorThickness = height; } public void setDrawBottomUnderLine(boolean draw) { mTabStrip.mDrawBottomUnderline = draw; } /** set the select text color and unselect text color. * @param selectColor the color of select * @param unSelectColor the color of unselect*/ public void setSelectRelativeTextColors(int selectColor, int unSelectColor) { mSelectTextColor = selectColor; mUnSelectTextColor = unSelectColor; } public void setSelectRelativeTextColorsRes(int selectColorId, int unSelectColorId) { mSelectTextColor = getContext().getResources().getColor(selectColorId); mUnSelectTextColor = getContext().getResources().getColor(unSelectColorId); } /** * Set the custom {@link TabColorizer} to be used. * * If you only require simple custmisation then you can use * {@link #setSelectedIndicatorColors(int...)} and {@link #setDividerColors(int...)} to achieve * similar effects. * @param tabColorizer the Tab Colorizer */ public void setCustomTabColorizer(TabColorizer tabColorizer) { mTabStrip.setCustomTabColorizer(tabColorizer); } public void setDrawHorizontalIndicator(boolean drawHorizontalIndicator) { mTabStrip.setDrawHorizontalIndicator(drawHorizontalIndicator); } public void setDrawVerticalIndicator(boolean drawVerticalIndicator) { mTabStrip.setDrawVerticalIndicator(drawVerticalIndicator); } public List<TextView> getTitleTextViews() { return mTitleTextViews; } /** * Sets the colors to be used for indicating the selected tab. These colors are treated as a * circular array. Providing one color will mean that all tabs are indicated with the same color. * @param colors the colors */ public void setSelectedIndicatorColors(int... colors) { mTabStrip.setSelectedIndicatorColors(colors); } /** * Sets the colors to be used for tab dividers. These colors are treated as a circular array. * Providing one color will mean that all tabs are indicated with the same color. * @param colors the colors */ public void setDividerColors(int... colors) { mTabStrip.setDividerColors(colors); } /** * Set the {@link ViewPager.OnPageChangeListener}. When using {@link SlidingTabLayout} you are * required to set any {@link ViewPager.OnPageChangeListener} through this method. This is so * that the layout can update it's scroll position correctly. * * @see ViewPager#setOnPageChangeListener(ViewPager.OnPageChangeListener) * @param listener the listener */ public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) { mViewPagerPageChangeListener = listener; } /** * Set the custom layout to be inflated for the tab views. * * @param layoutResId Layout id to be inflated * @param textViewId id of the {@link TextView} in the inflated view */ public void setCustomTabView(int layoutResId, int textViewId) { mTabViewLayoutId = layoutResId; mTabViewTextViewId = textViewId; } /** * Sets the associated view pager. Note that the assumption here is that the pager content * (number of tabs and tab titles) does not change after this call has been made. * @param viewPager the view pager */ public void setViewPager(ViewPager viewPager) { mTabStrip.removeAllViews(); mViewPager = viewPager; if (viewPager != null) { viewPager.addOnPageChangeListener(new InternalViewPagerListener()); populateTabStrip(); } } /* * Create a default view to be used for tabs. This is called if a custom tab view is not set via * {@link #setCustomTabView(int, int)}. * */ protected TextView createDefaultTabView(Context context) { TextView textView = new TextView(context); textView.setGravity(Gravity.CENTER); textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, TAB_VIEW_TEXT_SIZE_SP); textView.setTypeface(Typeface.DEFAULT_BOLD); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { // If we're running on Honeycomb or newer, then we can use the Theme's // selectableItemBackground to ensure that the View has a pressed state TypedValue outValue = new TypedValue(); getContext().getTheme().resolveAttribute(android.R.attr.selectableItemBackground, outValue, true); textView.setBackgroundResource(outValue.resourceId); } if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { // If we're running on ICS or newer, enable all-caps to match the Action Bar tab style textView.setAllCaps(true); } int padding = (int) (TAB_VIEW_PADDING_DIPS * getResources().getDisplayMetrics().density); textView.setPadding(padding, padding, padding, padding); return textView; } private void populateTabStrip() { final PagerAdapter adapter = mViewPager.getAdapter(); final OnClickListener tabClickListener = new TabClickListener(); if (mTitleTextViews != null) mTitleTextViews.clear(); final int count = adapter.getCount(); for (int i = 0; i < count; i++) { View tabView = null; TextView tabTitleView = null; boolean initSuccess = false; if (mTabViewLayoutId != 0) { // If there is a custom tab view layout id set, try and inflate it if (mTitleTextViews == null) mTitleTextViews = new ArrayList<>(); tabView = LayoutInflater.from(getContext()).inflate(mTabViewLayoutId, mTabStrip, false); tabTitleView = (TextView) tabView.findViewById(mTabViewTextViewId); if (mInitTitleListener != null) { initSuccess = mInitTitleListener.onInitTitle(i, tabTitleView); } mTitleTextViews.add(tabTitleView); } if (tabView == null) { tabView = createDefaultTabView(getContext()); if (mInitTitleListener != null) { initSuccess = mInitTitleListener.onInitTitle(i, (TextView) tabView); } } if (!initSuccess) { if (tabTitleView == null) { if (TextView.class.isInstance(tabView)) { tabTitleView = (TextView) tabView; } else { throw new IllegalStateException("tabView not intanceof TextView"); } } tabTitleView.setText(adapter.getPageTitle(i)); /*if (tabTitleView == null && TextView.class.isInstance(tabView)) { if( TextView.class.isInstance(tabView)) { tabTitleView = (TextView) tabView; tabTitleView.setText(adapter.getPageTitle(i)); } }*/ } tabView.setOnClickListener(tabClickListener); mTabStrip.addView(tabView); if (mPopulateListener != null) { mPopulateListener.onPopulateTab(this, i, tabView, tabTitleView); } } } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); if (mViewPager != null) { scrollToTab(mViewPager.getCurrentItem(), 0); } } private void scrollToTab(int tabIndex, int positionOffset) { final int tabStripChildCount = mTabStrip.getChildCount(); if (tabStripChildCount == 0 || tabIndex < 0 || tabIndex >= tabStripChildCount) { return; } View selectedChild = mTabStrip.getChildAt(tabIndex); if (selectedChild != null) { int targetScrollX = selectedChild.getLeft() + positionOffset; if (tabIndex > 0 || positionOffset > 0) { // If we're not at the first child and are mid-scroll, make sure we obey the offset targetScrollX -= mTitleOffset; } scrollTo(targetScrollX, 0); if (mInternalTabListener != null) { mInternalTabListener.onScroll(tabIndex, positionOffset, targetScrollX); } } } private class InternalViewPagerListener implements ViewPager.OnPageChangeListener { private int mScrollState; @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { int tabStripChildCount = mTabStrip.getChildCount(); if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) { return; } mTabStrip.onViewPagerPageChanged(position, positionOffset); View selectedTitle = mTabStrip.getChildAt(position); int extraOffset = (selectedTitle != null) ? (int) (positionOffset * selectedTitle.getWidth()) : 0; scrollToTab(position, extraOffset); if (mViewPagerPageChangeListener != null) { mViewPagerPageChangeListener.onPageScrolled(position, positionOffset, positionOffsetPixels); } /*if(mSelectPosition != position) mSelectPosition = position;*/ } @Override public void onPageScrollStateChanged(int state) { mScrollState = state; if (mViewPagerPageChangeListener != null) { mViewPagerPageChangeListener.onPageScrollStateChanged(state); } } @Override public void onPageSelected(int position) { if (mScrollState == ViewPager.SCROLL_STATE_IDLE) { mTabStrip.onViewPagerPageChanged(position, 0f); scrollToTab(position, 0); } if (mViewPagerPageChangeListener != null) { mViewPagerPageChangeListener.onPageSelected(position); } if (mSelectPosition != position) mSelectPosition = position; } } private class TabClickListener implements OnClickListener { @Override public void onClick(View v) { for (int i = 0; i < mTabStrip.getChildCount(); i++) { if (v == mTabStrip.getChildAt(i)) { mViewPager.setCurrentItem(i); mSelectPosition = i; return; } } } } private void setOnTabListener(OnTabListener l) { mInternalTabListener = l; } public void setOnInitTitleListener(OnInitTitleListener mInitTitleListener) { this.mInitTitleListener = mInitTitleListener; } public interface OnTabListener { void onScroll(int tabIndex, int positionOffset, int targetScrollX); } /** * this must be called */ public interface OnInitTitleListener { /** * init title * @param position the position of this tab * @param title the tab text/title * @return true while init title success! */ boolean onInitTitle(int position, TextView title); } public static abstract class SlidingPageChangeListener implements ViewPager.OnPageChangeListener { boolean ignore; @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { if (!ignore) { onPageSelected(position); } } @Override public void onPageScrollStateChanged(int state) { ignore = state == ViewPager.SCROLL_STATE_SETTLING; } } public interface OnPopulateListener { void onPopulateTab(SlidingTabLayout stl, int position, View itemView, TextView tabview); } /* * private void initSlidingTabLayout() { final Resources res = getResources(); mSlidingTabLayout.setOnInitTitleListener(new SlidingTabLayout.OnInitTitleListener() { @Override public boolean onInitTitle(int position, TextView title) { switch (position) { case 0: title.setTextColor(title.getContext().getResources().getColor(R.color.c_333333)); title.setText(getString(R.string.commodity)); break; case 1: title.setTextColor(title.getContext().getResources().getColor(R.color.c_666666)); title.setText(getString(R.string.detail)); break; case 2: title.setTextColor(title.getContext().getResources().getColor(R.color.c_666666)); title.setText(getString(R.string.comment)); break; } return true; } }); mSlidingTabLayout.setSelectIndicatorHeight(res.getDimensionPixelSize(R.dimen.common_indicator_height)); mSlidingTabLayout.setSplitWidthEquality(false); mSlidingTabLayout.setSelectRelativeTextColorsRes(R.color.c_333333, R.color.c_666666); mSlidingTabLayout.setCustomTabColorizer(new SlidingTabLayout.AbsTabColorizer(this) { @Override protected int getIndicatorColorRes(int position) { return R.color.c_333333; } @Override protected int getDividerColorRes(int position) { return R.color.c_ff9e1f; } }); mSlidingTabLayout.setOnPageChangeListener(new BasePageChangeListener() { @Override public void onPageSelected(int position) { onSelect(position); } }); } */ }