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; import android.annotation.SuppressLint; import android.content.Context; import android.os.Bundle; import android.support.annotation.AttrRes; import android.support.annotation.Nullable; import android.support.annotation.StyleRes; import android.support.v4.content.ContextCompat; import android.support.v4.widget.NestedScrollView; import android.text.TextUtils; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.SubMenu; import android.view.View; import android.view.ViewGroup; import android.webkit.WebView; import android.widget.ProgressBar; import java.lang.ref.WeakReference; import javax.inject.Inject; import io.github.hidroh.materialistic.data.ReadabilityClient; import io.github.hidroh.materialistic.data.WebItem; public class ReadabilityFragment extends LazyLoadFragment implements Scrollable { public static final String EXTRA_ITEM = ReadabilityFragment.class.getName() + ".EXTRA_ITEM"; private static final String STATE_CONTENT = "state:content"; private static final String STATE_TEXT_SIZE = "state:textSize"; private static final String STATE_TYPEFACE_NAME = "state:typefaceName"; private static final String FORMAT_HTML_COLOR = "%06X"; private NestedScrollView mScrollView; private WebView mWebView; private ProgressBar mProgressBar; private View mEmptyView; @Inject ReadabilityClient mReadabilityClient; private VolumeNavigationDelegate.NestedScrollViewHelper mScrollableHelper; private String mContent; private float mTextSize; private String[] mTextSizeOptionValues; private String mTypefaceName; private String[] mFontOptionValues; private boolean mAttached; private String mTextColor; private String mTextLinkColor; @Override public void onAttach(Context context) { super.onAttach(context); mAttached = true; } @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); if (savedInstanceState != null) { mTextSize = savedInstanceState.getFloat(STATE_TEXT_SIZE); mContent = savedInstanceState.getString(STATE_CONTENT); mTypefaceName = savedInstanceState.getString(STATE_TYPEFACE_NAME); } else { mTextSize = toHtmlPx(Preferences.Theme.resolvePreferredReadabilityTextSize(getActivity())); mTypefaceName = Preferences.Theme.getReadabilityTypeface(getActivity()); } mTextColor = toHtmlColor(android.R.attr.textColorPrimary); mTextLinkColor = toHtmlColor(android.R.attr.textColorLink); } @Override protected void createOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.menu_font_options, menu); mTextSizeOptionValues = getResources().getStringArray(R.array.pref_text_size_values); mFontOptionValues = getResources().getStringArray(R.array.font_values); SubMenu subMenu = menu.findItem(R.id.menu_font_size).getSubMenu(); String[] options = getResources().getStringArray(R.array.text_size_options); String initialTextSize = Preferences.Theme.getPreferredReadabilityTextSize(getActivity()); for (int i = 0; i < options.length; i++) { MenuItem item = subMenu.add(R.id.menu_font_size_group, Menu.NONE, i, options[i]); item.setChecked(TextUtils.equals(initialTextSize, mTextSizeOptionValues[i])); } subMenu.setGroupCheckable(R.id.menu_font_size_group, true, true); subMenu = menu.findItem(R.id.menu_font).getSubMenu(); options = getResources().getStringArray(R.array.font_options); String initialTypeface = Preferences.Theme.getReadabilityTypeface(getActivity()); for (int i = 0; i < options.length; i++) { MenuItem item = subMenu.add(R.id.menu_font_group, Menu.NONE, i, options[i]); item.setChecked(TextUtils.equals(initialTypeface, mFontOptionValues[i])); } subMenu.setGroupCheckable(R.id.menu_font_group, true, true); } @Override protected void prepareOptionsMenu(Menu menu) { menu.findItem(R.id.menu_font_options).setVisible(!TextUtils.isEmpty(mContent)); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == R.id.menu_font_size) { return true; } if (item.getGroupId() == R.id.menu_font_size_group) { item.setChecked(true); String choice = mTextSizeOptionValues[item.getOrder()]; mTextSize = toHtmlPx(Preferences.Theme.resolveTextSize(choice)); Preferences.Theme.savePreferredReadabilityTextSize(getActivity(), choice); render(); } else if (item.getGroupId() == R.id.menu_font_group) { item.setChecked(true); mTypefaceName = mFontOptionValues[item.getOrder()]; Preferences.Theme.savePreferredReadabilityTypeface(getActivity(), mTypefaceName); render(); } return true; } @SuppressLint("SetJavaScriptEnabled") @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_readability, container, false); mProgressBar = (ProgressBar) view.findViewById(R.id.progress); mScrollView = (NestedScrollView) view.findViewById(R.id.nested_scroll_view); mWebView = (WebView) view.findViewById(R.id.content); mWebView.getSettings().setJavaScriptEnabled(true); mWebView.setBackgroundColor(ContextCompat.getColor(getActivity(), AppUtils.getThemedResId(getActivity(), R.attr.colorCardBackground))); mEmptyView = view.findViewById(R.id.empty); return view; } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); mScrollableHelper = new VolumeNavigationDelegate.NestedScrollViewHelper(mScrollView); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putFloat(STATE_TEXT_SIZE, mTextSize); outState.putString(STATE_CONTENT, mContent); outState.putString(STATE_TYPEFACE_NAME, mTypefaceName); } @Override public void onDetach() { super.onDetach(); mAttached = false; } @Override public void scrollToTop() { mScrollableHelper.scrollToTop(); } @Override public boolean scrollToNext() { return mScrollableHelper.scrollToNext(); } @Override public boolean scrollToPrevious() { return mScrollableHelper.scrollToPrevious(); } @Override protected void load() { if (TextUtils.isEmpty(mContent)) { parse(); } else { bind(); } } private void parse() { WebItem item = getArguments().getParcelable(EXTRA_ITEM); if (item == null) { return; } mProgressBar.setVisibility(View.VISIBLE); mReadabilityClient.parse(item.getId(), item.getUrl(), new ReadabilityCallback(this)); } private void onParsed(String content) { mContent = content; bind(); } private void bind() { if (!mAttached) { return; } mProgressBar.setVisibility(View.GONE); getActivity().supportInvalidateOptionsMenu(); if (!TextUtils.isEmpty(mContent)) { render(); } else { mEmptyView.setVisibility(View.VISIBLE); } } private void render() { mWebView.loadDataWithBaseURL(null, wrap(mContent), "text/html", "UTF-8", null); } private String wrap(String html) { return getString(R.string.readability_html, mTypefaceName, mTextSize, mTextColor, mTextLinkColor, html, toHtmlPx(getResources().getDimension(R.dimen.activity_vertical_margin)), toHtmlPx(getResources().getDimension(R.dimen.activity_horizontal_margin))); } private String toHtmlColor(@AttrRes int colorAttr) { return String.format(FORMAT_HTML_COLOR, 0xFFFFFF & ContextCompat.getColor(getActivity(), AppUtils.getThemedResId(getActivity(), colorAttr))); } private float toHtmlPx(@StyleRes int textStyleAttr) { return toHtmlPx(AppUtils.getDimension(getActivity(), textStyleAttr, R.attr.contentTextSize)); } private float toHtmlPx(float dimen) { return dimen / getResources().getDisplayMetrics().density; } private static class ReadabilityCallback implements ReadabilityClient.Callback { private final WeakReference<ReadabilityFragment> mReadabilityFragment; public ReadabilityCallback(ReadabilityFragment readabilityFragment) { mReadabilityFragment = new WeakReference<>(readabilityFragment); } @Override public void onResponse(String content) { if (mReadabilityFragment.get() != null && mReadabilityFragment.get().isAttached()) { mReadabilityFragment.get().onParsed(content); } } } }