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 com.achenging.view; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Color; import android.os.Build; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v7.widget.AppCompatTextView; import android.util.AttributeSet; import android.util.Log; import android.util.TypedValue; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.HorizontalScrollView; import android.widget.LinearLayout; import android.widget.TextView; /** * 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. */ /** * ?google??sldingTabLayout ?? */ public class SlidingTabLayout extends HorizontalScrollView { /** * Allows complete control over the colors drawn in the tab layout. Set with * {@link #setCustomTabColorizer(TabColorizer)}. */ public interface TabColorizer { /** * @return return the color of the indicator used when {@code position} is selected. */ int getIndicatorColor(int position); /** * @return return the color of the divider drawn to the right of {@code position}. */ int getDividerColor(int position); int getSelectedColor(int position); int getUnselectedTitleColors(int position); } private static final int TITLE_OFFSET_DIPS = 24; private static final int TAB_VIEW_PADDING_DIPS = 14; private static final int TAB_VIEW_TEXT_SIZE_SP = 14; private static final int TAB_PDDING = 5; private static final int DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS = 1; private static final byte DEFAULT_BOTTOM_BORDER_COLOR_ALPHA = 0x00; private static final int SELECTED_INDICATOR_THICKNESS_DIPS = 2; private static final int DEFAULT_SELECTED_INDICATOR_COLOR = 0xFF999999; private static final int DEFAULT_DIVIDER_THICKNESS_DIPS = 1; private static final byte DEFAULT_DIVIDER_COLOR_ALPHA = 0x20; public static final int DEFAULT_TEXT_PADDING = 10; private int mTitleOffset; private int mTabViewLayoutId; private int mTabViewTextViewId; private int mTabSelectedTextColor; private int mTabTextColor; private int mTextPadding; private boolean mAvgSplit; private ViewPager mViewPager; private ViewPager.OnPageChangeListener mViewPagerPageChangeListener; private final SlidingTabStrip mTabStrip; 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); mTabStrip = new SlidingTabStrip(context); int defaultBackgroundColor = mTabStrip.getSolidColor(); // Disable the Scroll Bar setHorizontalScrollBarEnabled(true); // Make sure that the Tab Strips fills this View setFillViewport(true); //? TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.SlidingTabLayout); // mTabSelectedTextColor = typedArray.getColor(R.styleable.SlidingTabLayout_tabSelectedTextColor, 0); mTabTextColor = typedArray.getColor(R.styleable.SlidingTabLayout_tabTextColor, 0); // int selectedIndicatorThickness = (int) typedArray.getDimension( R.styleable.SlidingTabLayout_tabIndicatorThickness, SELECTED_INDICATOR_THICKNESS_DIPS); // int tabIndicatorColor = typedArray.getColor(R.styleable.SlidingTabLayout_tabIndicatorColor, DEFAULT_SELECTED_INDICATOR_COLOR); //tab int tabDividerThickness = (int) typedArray.getDimension(R.styleable.SlidingTabLayout_dividerThickness, DEFAULT_DIVIDER_THICKNESS_DIPS); //tab int tabDividerColor = typedArray.getColor(R.styleable.SlidingTabLayout_dividerColor, defaultBackgroundColor); //tab?? int tabBottomBorderThickness = (int) typedArray.getDimension( R.styleable.SlidingTabLayout_bottomBorderThickness, DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS); int tabBottomBorderColor = typedArray.getColor(R.styleable.SlidingTabLayout_bottomBorderColor, defaultBackgroundColor); //?tab? boolean showAsDivider = typedArray.getBoolean(R.styleable.SlidingTabLayout_showAsDivider, false); typedArray.recycle(); // // mTitleOffset = (int) (TITLE_OFFSET_DIPS * getResources().getDisplayMetrics().density); mTextPadding = (int) (DEFAULT_TEXT_PADDING * getResources().getDisplayMetrics().density); // setSelectedTitleColors(mTabSelectedTextColor); setUnSelectedTitleColors(mTabTextColor); setDividerColors(tabDividerColor); setSelectedIndicatorColors(tabIndicatorColor); setTabBottomBorderColor(tabBottomBorderColor); setTabDividerColor(tabDividerColor); // setSelectedIndicatorThickness(selectedIndicatorThickness); setTabBottomBorderThickness(tabBottomBorderThickness); setTabDividerThickness(tabDividerThickness); setShowAsDivider(showAsDivider); setShowTabDivider(false); LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); params.gravity = Gravity.CENTER; addView(mTabStrip); } public void setTabBottomBorderColor(int defaultBottomBorderColor) { mTabStrip.setBottomBorderColor(defaultBottomBorderColor); } public void setTabBottomBorderThickness(int bottomBorderThickness) { mTabStrip.setBottomBorderThickness(bottomBorderThickness); } public void setShowAsDivider(boolean showAsDivider) { mTabStrip.setShowAsDivider(showAsDivider); } public void setSelectedIndicatorThickness(int selectedIndicatorThickness) { mTabStrip.setSelectedIndicatorThickness(selectedIndicatorThickness); } public void setTabDividerThickness(float tabDividerThickness) { mTabStrip.setTabDividerThickness(tabDividerThickness); } public void setTabDividerColor(int tabDividerColor) { mTabStrip.setTabDividerColor(tabDividerColor); } /** * 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. */ public void setCustomTabColorizer(TabColorizer tabColorizer) { mTabStrip.setCustomTabColorizer(tabColorizer); } /** * 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. */ 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. */ 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) */ 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; } public void setSelectedTitleColors(int... colors) { mTabStrip.setSelectedTitleColors(colors); } public void setUnSelectedTitleColors(int... colors) { mTabStrip.setUnselectedTitleColors(colors); } /** * 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. */ public void setViewPager(ViewPager viewPager) { mTabStrip.removeAllViews(); mViewPager = viewPager; if (viewPager != null) { viewPager.setOnPageChangeListener(new InternalViewPagerListener()); populateTabStrip(); } } public void setViewPager(ViewPager viewPager, boolean avgSplit) { mAvgSplit = avgSplit; setViewPager(viewPager); } /** * 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) { AppCompatTextView textView = new AppCompatTextView(context); textView.setGravity(Gravity.CENTER); textView.setBackgroundColor(Color.WHITE); textView.setPadding(mTextPadding, mTextPadding, mTextPadding, mTextPadding); textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, TAB_VIEW_TEXT_SIZE_SP); if (mAvgSplit) { int screenWidth = getResources().getDisplayMetrics().widthPixels; textView.setWidth(screenWidth / mViewPager.getAdapter().getCount()); } 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); } return textView; } private void populateTabStrip() { final PagerAdapter adapter = mViewPager.getAdapter(); final OnClickListener tabClickListener = new TabClickListener(); for (int i = 0; i < adapter.getCount(); i++) { View tabView = null; TextView tabTitleView = null; if (mTabViewLayoutId != 0) { // If there is a custom tab view layout id set, try and inflate it tabView = LayoutInflater.from(getContext()).inflate(mTabViewLayoutId, mTabStrip, false); tabTitleView = (TextView) tabView.findViewById(mTabViewTextViewId); } if (tabView == null) { tabView = createDefaultTabView(getContext()); } if (tabTitleView == null && TextView.class.isInstance(tabView)) { tabTitleView = (TextView) tabView; } tabTitleView.setText(adapter.getPageTitle(i)); tabView.setOnClickListener(tabClickListener); if (i == mViewPager.getCurrentItem()) { tabTitleView.setTextColor(mTabSelectedTextColor); } else { tabTitleView.setTextColor(mTabTextColor); } LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT); mTabStrip.addView(tabView, params); } } @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); } } private class InternalViewPagerListener implements ViewPager.OnPageChangeListener { private int mCurrentScrollState; private int mPrevScrollState; @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); if (mCurrentScrollState == ViewPager.SCROLL_STATE_DRAGGING || (mPrevScrollState == ViewPager.SCROLL_STATE_DRAGGING && mCurrentScrollState == ViewPager.SCROLL_STATE_SETTLING)) { TextView textView = (TextView) mTabStrip.getChildAt(position); TextView nextTextView = (TextView) mTabStrip.getChildAt(position + 1); if (textView != null && nextTextView != null) { if (positionOffset <= 0.5) { nextTextView.setTextColor(mTabTextColor); textView.setTextColor(mTabSelectedTextColor); } else { nextTextView.setTextColor(mTabSelectedTextColor); textView.setTextColor(mTabTextColor); } } } 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); } } @Override public void onPageScrollStateChanged(int state) { mPrevScrollState = mCurrentScrollState; mCurrentScrollState = state; if (mViewPagerPageChangeListener != null) { mViewPagerPageChangeListener.onPageScrollStateChanged(state); } } @Override public void onPageSelected(int position) { if (mCurrentScrollState == ViewPager.SCROLL_STATE_IDLE) { mTabStrip.onViewPagerPageChanged(position, 0f); scrollToTab(position, 0); } int count = mTabStrip.getChildCount(); for (int i = 0; i < count; i++) { if (position == i) { TextView tabTitleView = (TextView) mTabStrip.getChildAt(position); tabTitleView.setTextColor(mTabSelectedTextColor); } else { ((TextView) mTabStrip.getChildAt(i)).setTextColor(mTabTextColor); } } if (mViewPagerPageChangeListener != null) { mViewPagerPageChangeListener.onPageSelected(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); return; } } } } public void setShowTabDivider(boolean isShow) { if (isShow) return; mTabStrip.setShowDividers(SlidingTabStrip.SHOW_DIVIDER_NONE); Log.d("Tab Divider No Show", ">>>>>>>>>>>>>>>>"); } public void setTabStripDividerColor(int color) { mTabStrip.setDividerColors(color); } }