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The source code is released under:
Apache License
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package com.nightlynexus.xkcd; //w w w . j a va 2 s . c o m import android.app.Fragment; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.Typeface; import android.graphics.drawable.Drawable; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.support.v4.view.MenuItemCompat; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.widget.ShareActionProvider; import android.text.Editable; import android.text.InputFilter; import android.text.Spanned; import android.text.TextWatcher; import android.view.Gravity; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.ProgressBar; import android.widget.ScrollView; import android.widget.TextView; import android.widget.Toast; import com.squareup.picasso.Picasso; import com.squareup.picasso.Target; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.Random; import retrofit.Callback; import retrofit.RestAdapter; import retrofit.RetrofitError; import retrofit.client.Response; public class ComicFragment extends Fragment { public static final String KEY_COMIC_NUMBER_REQUESTED = "KEY_COMIC_NUMBER_REQUESTED"; private static final String ENDPOINT = "http://xkcd.com"; private static final String DIRECTORY_NAME = "xkcd"; private static final String KEY_MAX = "KEY_MAX"; private static final String KEY_POSITION = "KEY_POSITION"; private ComicService mRestService; private View mRetryFrame; private View mNavBarComic; private EditText mNumberPicker; private View mPreviousView; private View mNextView; private ViewPager mViewPager; private PagerAdapter mAdapter; private ShareActionProvider mShareActionProvider = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); final RestAdapter restAdapter = new RestAdapter.Builder() .setEndpoint(ENDPOINT) .build(); mRestService = restAdapter.create(ComicService.class); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { final View rootView = inflater.inflate(R.layout.fragment_comic, container, false); mNavBarComic = rootView.findViewById(R.id.nav_bar_comic); mNumberPicker = (EditText) rootView.findViewById(R.id.number_picker); mPreviousView = rootView.findViewById(R.id.previous); mNextView = rootView.findViewById(R.id.next); mViewPager = (ViewPager) rootView.findViewById(R.id.view_pager); mRetryFrame = rootView.findViewById(R.id.retry_frame); return rootView; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); setNavBarComicAndChildrenEnabled(false); if (savedInstanceState != null && savedInstanceState.getInt(KEY_MAX) >= 0 && savedInstanceState.getInt(KEY_POSITION) >= 0) { setupNumberPicker(savedInstanceState.getInt(KEY_MAX)); setupAdapter(savedInstanceState.getInt(KEY_MAX), savedInstanceState.getInt(KEY_POSITION)); } else { mRestService.getComicLatest(new Callback<Comic>() { private final Callback<Comic> mCallback = this; @Override public void success(Comic comic, Response response) { if (isDetached()) return; mRetryFrame.setVisibility(View.GONE); mViewPager.setVisibility(View.VISIBLE); setupNumberPicker(comic.getNum()); final int comicNumRequested = getArguments().getInt(KEY_COMIC_NUMBER_REQUESTED); setupAdapter(comic.getNum(), getSafeComicIndex(comicNumRequested, comic.getNum())); } @Override public void failure(RetrofitError retrofitError) { if (isDetached()) return; mRetryFrame.findViewById(R.id.retry_button).setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { mRestService.getComicLatest(mCallback); } }); mViewPager.setVisibility(View.GONE); mRetryFrame.setVisibility(View.VISIBLE); } }); } } private void setupNumberPicker(final int numMax) { final InputFilter filters[] = new InputFilter[] { new InputFilter() { @Override public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) { final String str = dest.toString().substring(0, dstart) + source.toString().substring(start, end) + dest.toString().substring(dend); if (str.length() == 0) return source.subSequence(start, end); try { final int number = Integer.parseInt(str); if (number < 1 || number > numMax) { return dest.subSequence(dstart, dend); } return source.subSequence(start, end); } catch (NumberFormatException nfe) { return dest.subSequence(dstart, dend); } } } }; mNumberPicker.setFilters(filters); mNumberPicker.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void afterTextChanged(Editable s) { if (s.length() > 0) { mViewPager.setCurrentItem(Integer.parseInt(s.toString()) - 1); } } }); mPreviousView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mViewPager.setCurrentItem(mViewPager.getCurrentItem() - 1); } }); mNextView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mViewPager.setCurrentItem(mViewPager.getCurrentItem() + 1); } }); setNavBarComicAndChildrenEnabled(true); } private void setupAdapter(final int num, final int position) { mAdapter = new PagerAdapter() { @Override public Object instantiateItem(ViewGroup container, final int position) { final SwipeRefreshLayout swipeRefreshLayout = new SwipeRefreshLayout(getActivity()); final ScrollView sv = new ScrollView(getActivity()); sv.setFillViewport(true); final LinearLayout ll = new LinearLayout(getActivity()); final int hp = (int) getResources().getDimension(R.dimen.activity_horizontal_margin); final int vp = (int) getResources().getDimension(R.dimen.activity_vertical_margin); ll.setPadding(hp, vp, hp, vp); final TextView titleView = new TextView(getActivity()); final ProgressBar progress = new ProgressBar(getActivity()); final Button failedButton = new Button(getActivity()); final String[] interblag = getResources().getStringArray(R.array.internet_names); failedButton.setText(getString(R.string.retry_button_text_comic, interblag[new Random().nextInt(interblag.length)])); failedButton.setVisibility(View.GONE); final TextView tv = new TextView(getActivity()); final ScrollView.LayoutParams params1 = new ScrollView.LayoutParams( ScrollView.LayoutParams.MATCH_PARENT, ScrollView.LayoutParams.WRAP_CONTENT); ll.setLayoutParams(params1); ll.setGravity(Gravity.CENTER); ll.setOrientation(LinearLayout.VERTICAL); final LinearLayout.LayoutParams params = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); params.gravity = Gravity.CENTER; progress.setLayoutParams(params); failedButton.setLayoutParams(params); titleView.setLayoutParams(params); titleView.setPadding(0, 0, 0, (int) getResources().getDimension(R.dimen.padding_bottom_title)); titleView.setGravity(Gravity.CENTER); titleView.setTextAppearance(getActivity(), R.style.TitleText); progress.setVisibility(View.VISIBLE); final ImageView iv = getImageView(); iv.setVisibility(View.GONE); final TextView dateView = getDateView(); tv.setLayoutParams(params); tv.setPadding(0, (int) getResources().getDimension(R.dimen.padding_top_alt_text), 0, 0); tv.setGravity(Gravity.CENTER); tv.setTextIsSelectable(true); mRestService.getComic(position + 1, new Callback<Comic>() { private final Callback<Comic> mCallback = this; @Override public void success(final Comic comic, Response response) { if (isDetached()) return; titleView.setText(comic.getTitle()); tv.setText(comic.getAlt()); dateView.setText(comic.getDate()); final Target target = new Target() { @Override public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from) { if (isDetached()) return; progress.setVisibility(View.GONE); iv.setImageBitmap(bitmap); iv.setTag(false); iv.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if ((Boolean) iv.getTag()) { iv.setImageBitmap(bitmap); iv.setTag(false); } else { iv.setImageBitmap(invert(bitmap)); iv.setTag(true); } } }); iv.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View v) { final Bitmap bitmapSave = (Boolean) iv.getTag() ? invert(bitmap) : bitmap; final String comicName = position + 1 + " -- " + comic.getTitle(); if (saveBitmap(bitmapSave, comicName)) { Toast.makeText(getActivity(), getString(R.string.saved_comic_confirmation, comicName), Toast.LENGTH_LONG).show(); } return true; } }); iv.setVisibility(View.VISIBLE); } @Override public void onBitmapFailed(Drawable drawable) { if (isDetached()) return; onFailure(); } @Override public void onPrepareLoad(Drawable drawable) { if (isDetached()) return; } }; tv.setTag(target); Picasso.with(getActivity()).load(comic.getImg()).into(target); } @Override public void failure(RetrofitError retrofitError) { if (isDetached()) return; onFailure(); } private void onFailure() { failedButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { failedButton.setVisibility(View.GONE); progress.setVisibility(View.VISIBLE); mRestService.getComic(position + 1, mCallback); } }); progress.setVisibility(View.GONE); failedButton.setVisibility(View.VISIBLE); } }); ll.addView(titleView); ll.addView(progress); ll.addView(failedButton); ll.addView(iv); ll.addView(tv); ll.addView(dateView); sv.addView(ll); swipeRefreshLayout.addView(sv); swipeRefreshLayout.setColorSchemeResources(android.R.color.black); swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { final Random random = new Random(); final int position = random.nextInt(num); mViewPager.setCurrentItem(position, false); swipeRefreshLayout.setRefreshing(false); } }); container.addView(swipeRefreshLayout); return swipeRefreshLayout; } @Override public void destroyItem(ViewGroup container, int position, Object view) { container.removeView((View) view); } @Override public int getCount() { return num; } @Override public boolean isViewFromObject(View view, Object object) { return view == object; } }; mViewPager.setAdapter(mAdapter); mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int i, float v, int i2) { } @Override public void onPageSelected(int i) { if (mShareActionProvider != null) mShareActionProvider.setShareIntent(getShareIntent()); mNumberPicker.setText(String.valueOf(i + 1)); mNumberPicker.setSelection(mNumberPicker.length()); mPreviousView.setEnabled(i > 0); mNextView.setEnabled(i < num - 1); } @Override public void onPageScrollStateChanged(int i) { } }); mViewPager.setCurrentItem(position); } private void setNavBarComicAndChildrenEnabled(final boolean enabled) { mNumberPicker.setEnabled(enabled); mPreviousView.setEnabled(enabled); mNextView.setEnabled(enabled); mNavBarComic.setEnabled(enabled); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater menuInflater) { menuInflater.inflate(R.menu.comic, menu); MenuItem menuItem = menu.findItem(R.id.action_share); mShareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(menuItem); mShareActionProvider.setShareIntent(getShareIntent()); } private Intent getShareIntent() { // hacky to get link final String link = mAdapter == null ? ENDPOINT : ENDPOINT + "/" + (mViewPager.getCurrentItem() + 1); final Intent intent = new Intent(android.content.Intent.ACTION_SEND); intent.setType("text/plain"); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { intent.addFlags(Intent.FLAG_ACTIVITY_NEW_DOCUMENT); } else { intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET); } intent.putExtra(Intent.EXTRA_SUBJECT, ENDPOINT); intent.putExtra(Intent.EXTRA_TEXT, link); return intent; } @Override public void onSaveInstanceState(Bundle outState) { outState.putInt(KEY_MAX, mAdapter == null ? -1 : mAdapter.getCount()); outState.putInt(KEY_POSITION, mAdapter == null ? -1 : mViewPager.getCurrentItem()); super.onSaveInstanceState(outState); } private static int getSafeComicIndex(final int comicNumber, final int comicNumberMax) { return ((comicNumber > 0 && comicNumber <= comicNumberMax) ? comicNumber : comicNumberMax) - 1; } public void requestComicNumber(final int comicNumber) { if (isDetached()) throw new RuntimeException( "This fragment has been detached and cannot update the current comic."); mViewPager.setCurrentItem(getSafeComicIndex(comicNumber, mAdapter.getCount()), false); } private ImageView getImageView() { final LinearLayout.LayoutParams paramsImage = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); final ImageView iv = new ImageView(getActivity()); iv.setLayoutParams(paramsImage); iv.setScaleType(ImageView.ScaleType.FIT_CENTER); iv.setAdjustViewBounds(true); iv.setContentDescription(getString( R.string.comic_content_description)); return iv; } private TextView getDateView() { final LinearLayout.LayoutParams params = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); params.gravity = Gravity.END; final TextView dateView = new TextView(getActivity()); dateView.setLayoutParams(params); dateView.setPadding(0, (int) getResources().getDimension(R.dimen.padding_top_date), 0, 0); dateView.setGravity(Gravity.CENTER); dateView.setTypeface(Typeface.create("sans-serif-light", Typeface.NORMAL)); return dateView; } private static Bitmap invert(Bitmap original) { // Create mutable Bitmap to invert, argument true makes it mutable Bitmap inversion = original.copy(Bitmap.Config.ARGB_4444, true); // Get info about Bitmap int width = inversion.getWidth(); int height = inversion.getHeight(); int pixels = width * height; // Get original pixels int[] pixel = new int[pixels]; inversion.getPixels(pixel, 0, width, 0, 0, width, height); // Modify pixels final int RGB_MASK = 0x00FFFFFF; for (int i = 0; i < pixels; i++) pixel[i] ^= RGB_MASK; inversion.setPixels(pixel, 0, width, 0, 0, width, height); // Return inverted Bitmap return inversion; } private boolean saveBitmap(final Bitmap bmp, final String comicName) { final String filename = Environment.getExternalStorageDirectory().getPath() + "/" + DIRECTORY_NAME + "/" + comicName + ".png"; boolean success = false; FileOutputStream out = null; try { new File(filename).getParentFile().mkdirs(); out = new FileOutputStream(filename); bmp.compress(Bitmap.CompressFormat.PNG, 90, out); success = true; } catch (Exception e) { e.printStackTrace(); } finally { try { if (out != null) { out.close(); } } catch (IOException e) { e.printStackTrace(); } } return success; } }