Java tutorial
/* * Copyright 2014 Google Inc. All rights reserved. * * 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.gustavofao.materialtabs; import android.content.Context; import android.graphics.Color; import android.graphics.PorterDuff; import android.graphics.Typeface; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v7.app.ActionBar; import android.util.AttributeSet; import android.util.Log; import android.util.SparseArray; 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.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import static com.gustavofao.materialtabs.TabType.ICON_ONLY; import static com.gustavofao.materialtabs.TabType.TEXT_ONLY; public class SlidingTabLayout extends HorizontalScrollView { private static final int TEXT_ONLY_TAB = R.layout.text_only; private static final int ICON_ONLY_TAB = R.layout.icon_only; private static final int TEXT_ICON_TAB = R.layout.text_icon; public static final int FOCUSED_WHITE = 0xFFFFFFFF; public static final int NOT_FOCUSED_WHITE = 0xB3FFFFFF; private static final int TEXT_ID = R.id.TabText; private static final int ICON_ID = R.id.TabImage; private static final int INDICATOR_ID = R.id.TabIndicator; private boolean mDistributeEvenly; private int customFocusedColor; private int customUnfocusedColor; private int mTitleOffset; private int textSize = 14; private TabType tabType; private ActionBar actionBar; 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); // Disable the Scroll Bar setHorizontalScrollBarEnabled(false); // Make sure that the Tab Strips fills this View setFillViewport(true); mTabStrip = new SlidingTabStrip(context); addView(mTabStrip, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); } public void setCustomUnfocusedColor(int customUnfocusedColor) { this.customUnfocusedColor = customUnfocusedColor; } public void setCustomFocusedColor(int customFocusedColor) { this.customFocusedColor = customFocusedColor; } public void setDistributeEvenly(boolean distributeEvenly) { mDistributeEvenly = distributeEvenly; } public void setTabType(TabType tabType) { this.tabType = tabType; } public void setSelectedIndicatorColors(int... colors) { mTabStrip.setSelectedIndicatorColors(colors); } public void setActionBar(ActionBar actionBar) { this.actionBar = actionBar; } public void setTextSize(int textSize) { this.textSize = textSize; } public void showIndicator(int position) { if (tabType != ICON_ONLY) return; View tabView = mTabStrip.getChildAt(position); View tabIndicator = tabView.findViewById(INDICATOR_ID); if (tabIndicator != null) { tabIndicator.setVisibility(View.VISIBLE); } } public void showIndicators(int... position) { if (tabType != ICON_ONLY) return; for (int pos : position) { View tabView = mTabStrip.getChildAt(pos); View tabIndicator = tabView.findViewById(INDICATOR_ID); if (tabIndicator != null) { tabIndicator.setVisibility(View.VISIBLE); } } } public void hideIndicator(int position) { if (tabType != ICON_ONLY) return; View tabView = mTabStrip.getChildAt(position); View tabIndicator = tabView.findViewById(INDICATOR_ID); if (tabIndicator != null) { tabIndicator.setVisibility(View.GONE); } } public void hideIndicators(int... position) { if (tabType != ICON_ONLY) return; for (int pos : position) { View tabView = mTabStrip.getChildAt(pos); View tabIndicator = tabView.findViewById(INDICATOR_ID); if (tabIndicator != null) { tabIndicator.setVisibility(View.GONE); } } } public boolean isIndicatorVisible(int position) { if (tabType != ICON_ONLY) return false; View tabView = mTabStrip.getChildAt(position); View tabIndicator = tabView.findViewById(INDICATOR_ID); return tabIndicator.getVisibility() == View.VISIBLE; } public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) { mViewPagerPageChangeListener = listener; } public void setViewPager(ViewPager viewPager) { mTabStrip.removeAllViews(); if (tabType == null) tabType = TEXT_ONLY; mViewPager = viewPager; if (viewPager != null) { viewPager.setOnPageChangeListener(new InternalViewPagerListener()); populateTabStrip(); SlidingFragmentPagerAdapter adapter = (SlidingFragmentPagerAdapter) mViewPager.getAdapter(); if (actionBar != null) actionBar.setTitle(adapter.getToolbarTitle(mViewPager.getCurrentItem())); } } private void populateTabStrip() { final SlidingFragmentPagerAdapter adapter = (SlidingFragmentPagerAdapter) mViewPager.getAdapter(); final OnClickListener tabClickListener = new TabClickListener(); if (tabType == null) tabType = TEXT_ONLY; int focused_color = customFocusedColor != 0 ? customFocusedColor : FOCUSED_WHITE; int unfocused_color = customUnfocusedColor != 0 ? customUnfocusedColor : NOT_FOCUSED_WHITE; for (int i = 0; i < adapter.getCount(); i++) { View tabView = null; TextView tabTitleView = null; ImageView tabImageView = null; switch (tabType) { case TEXT_ONLY: tabView = LayoutInflater.from(getContext()).inflate(TEXT_ONLY_TAB, mTabStrip, false); tabTitleView = (TextView) tabView.findViewById(TEXT_ID); break; case ICON_ONLY: tabView = LayoutInflater.from(getContext()).inflate(ICON_ONLY_TAB, mTabStrip, false); tabImageView = (ImageView) tabView.findViewById(ICON_ID); break; case TEXT_ICON: tabView = LayoutInflater.from(getContext()).inflate(TEXT_ICON_TAB, mTabStrip, false); tabTitleView = (TextView) tabView.findViewById(TEXT_ID); tabImageView = (ImageView) tabView.findViewById(ICON_ID); break; } if (mDistributeEvenly) { LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) tabView.getLayoutParams(); lp.width = 0; lp.weight = 1; } if (i == mViewPager.getCurrentItem()) tabView.setSelected(true); if (tabTitleView != null && adapter.getPageTitle(i) != null) { tabTitleView.setText(adapter.getPageTitle(i)); tabTitleView.setTextSize(TypedValue.COMPLEX_UNIT_SP, this.textSize); tabTitleView.setTextColor(i == mViewPager.getCurrentItem() ? focused_color : unfocused_color); } if (tabImageView != null && adapter.getPageDrawable(i) != null) { tabImageView.setImageDrawable(adapter.getPageDrawable(i)); tabImageView.setColorFilter(i == mViewPager.getCurrentItem() ? focused_color : unfocused_color, PorterDuff.Mode.MULTIPLY); } tabView.setOnClickListener(tabClickListener); mTabStrip.addView(tabView); } } @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 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); } } @Override public void onPageScrollStateChanged(int state) { mScrollState = state; if (mViewPagerPageChangeListener != null) { mViewPagerPageChangeListener.onPageScrollStateChanged(state); } } @Override public void onPageSelected(int position) { TextView tabTitleView = null; ImageView tabImageView = null; SlidingFragmentPagerAdapter adapter = (SlidingFragmentPagerAdapter) mViewPager.getAdapter(); int focused_color = customFocusedColor != 0 ? customFocusedColor : FOCUSED_WHITE; int unfocused_color = customUnfocusedColor != 0 ? customUnfocusedColor : NOT_FOCUSED_WHITE; if (mScrollState == ViewPager.SCROLL_STATE_IDLE) { mTabStrip.onViewPagerPageChanged(position, 0f); scrollToTab(position, 0); } if (actionBar != null) { actionBar.setTitle(adapter.getToolbarTitle(mViewPager.getCurrentItem())); } for (int i = 0; i < mTabStrip.getChildCount(); i++) { mTabStrip.getChildAt(i).setSelected(position == i); switch (tabType) { case TEXT_ONLY: tabTitleView = (TextView) mTabStrip.getChildAt(i).findViewById(TEXT_ID); tabTitleView.setTextColor(i == mViewPager.getCurrentItem() ? focused_color : unfocused_color); break; case ICON_ONLY: tabImageView = (ImageView) mTabStrip.getChildAt(i).findViewById(ICON_ID); tabImageView.setColorFilter(i == mViewPager.getCurrentItem() ? focused_color : unfocused_color, PorterDuff.Mode.MULTIPLY); break; case TEXT_ICON: tabTitleView = (TextView) mTabStrip.getChildAt(i).findViewById(TEXT_ID); tabImageView = (ImageView) mTabStrip.getChildAt(i).findViewById(ICON_ID); tabTitleView.setTextColor(i == mViewPager.getCurrentItem() ? focused_color : unfocused_color); tabImageView.setColorFilter(i == mViewPager.getCurrentItem() ? focused_color : unfocused_color, PorterDuff.Mode.MULTIPLY); break; } } 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; } } } } }