Java tutorial
/* * Copyright (c) 2015 Ha Duy Trung * * 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 io.github.hidroh.materialistic.widget; import android.content.Context; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.TabLayout; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentStatePagerAdapter; import android.support.v4.view.ViewPager; import android.view.ViewGroup; import io.github.hidroh.materialistic.AppUtils; import io.github.hidroh.materialistic.ItemFragment; import io.github.hidroh.materialistic.LazyLoadFragment; import io.github.hidroh.materialistic.Preferences; import io.github.hidroh.materialistic.R; import io.github.hidroh.materialistic.ReadabilityFragment; import io.github.hidroh.materialistic.Scrollable; import io.github.hidroh.materialistic.WebFragment; import io.github.hidroh.materialistic.annotation.Synthetic; import io.github.hidroh.materialistic.data.Item; import io.github.hidroh.materialistic.data.WebItem; public class ItemPagerAdapter extends FragmentStatePagerAdapter { private final Fragment[] mFragments = new Fragment[3]; private final Context mContext; private final WebItem mItem; private final boolean mShowArticle; private final int mCacheMode; private final int mDefaultItem; private TabLayout.OnTabSelectedListener mTabListener; public ItemPagerAdapter(Context context, FragmentManager fm, @NonNull Builder builder) { super(fm); mContext = context; mItem = builder.item; mShowArticle = builder.showArticle; mCacheMode = builder.cacheMode; switch (builder.defaultViewMode) { case Article: mDefaultItem = 1; break; case Readability: mDefaultItem = mShowArticle ? 2 : 1; break; default: mDefaultItem = 0; } } @Override public Fragment getItem(int position) { if (mFragments[position] != null) { return mFragments[position]; } String fragmentName; Bundle args = new Bundle(); args.putBoolean(LazyLoadFragment.EXTRA_EAGER_LOAD, mDefaultItem == position); if (position == 0) { args.putParcelable(ItemFragment.EXTRA_ITEM, mItem); args.putInt(ItemFragment.EXTRA_CACHE_MODE, mCacheMode); fragmentName = ItemFragment.class.getName(); } else if (position == getCount() - 1) { args.putParcelable(ReadabilityFragment.EXTRA_ITEM, mItem); fragmentName = ReadabilityFragment.class.getName(); } else { args.putParcelable(WebFragment.EXTRA_ITEM, mItem); fragmentName = WebFragment.class.getName(); } return Fragment.instantiate(mContext, fragmentName, args); } @Override public Object instantiateItem(ViewGroup container, int position) { mFragments[position] = (Fragment) super.instantiateItem(container, position); return mFragments[position]; } @Override public int getCount() { if (mItem.isStoryType()) { return mShowArticle ? 3 : 2; } else { return 1; } } @Override public CharSequence getPageTitle(int position) { if (position == 0) { if (mItem instanceof Item) { int count = ((Item) mItem).getKidCount(); return mContext.getResources().getQuantityString(R.plurals.comments_count, count, count); } return mContext.getString(R.string.title_activity_item); } if (position == getCount() - 1) { return mContext.getString(R.string.readability); } return mContext.getString(R.string.article); } public void bind(ViewPager viewPager, TabLayout tabLayout, FloatingActionButton navigationFab, FloatingActionButton genericFab) { viewPager.setPageMargin(viewPager.getResources().getDimensionPixelOffset(R.dimen.divider)); viewPager.setPageMarginDrawable(R.color.blackT12); viewPager.setOffscreenPageLimit(2); viewPager.setAdapter(this); tabLayout.setupWithViewPager(viewPager); mTabListener = new TabLayout.ViewPagerOnTabSelectedListener(viewPager) { @Override public void onTabSelected(TabLayout.Tab tab) { super.onTabSelected(tab); toggleFabs(viewPager.getCurrentItem() == 0, navigationFab, genericFab); Fragment fragment = getItem(viewPager.getCurrentItem()); if (fragment != null) { ((LazyLoadFragment) fragment).loadNow(); } } @Override public void onTabReselected(TabLayout.Tab tab) { Fragment fragment = getItem(viewPager.getCurrentItem()); if (fragment != null) { ((Scrollable) fragment).scrollToTop(); } } }; tabLayout.addOnTabSelectedListener(mTabListener); viewPager.setCurrentItem(mDefaultItem); toggleFabs(mDefaultItem == 0, navigationFab, genericFab); } @Synthetic void toggleFabs(boolean isComments, FloatingActionButton navigationFab, FloatingActionButton genericFab) { AppUtils.toggleFab(navigationFab, isComments && Preferences.navigationEnabled(navigationFab.getContext())); AppUtils.toggleFab(genericFab, true); AppUtils.toggleFabAction(genericFab, mItem, isComments); } public void unbind(TabLayout tabLayout) { if (mTabListener != null) { tabLayout.removeOnTabSelectedListener(mTabListener); } } public static class Builder { WebItem item; boolean showArticle; int cacheMode; Preferences.StoryViewMode defaultViewMode; public Builder setItem(@NonNull WebItem item) { this.item = item; return this; } public Builder setShowArticle(boolean showArticle) { this.showArticle = showArticle; return this; } public Builder setCacheMode(int cacheMode) { this.cacheMode = cacheMode; return this; } public Builder setDefaultViewMode(Preferences.StoryViewMode viewMode) { this.defaultViewMode = viewMode; return this; } } }