Java tutorial
/** * ******************************************************************************* * Copyright 2016 Tom Praschan * <p/> * 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 * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * 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 de.tap.easy_xkcd.fragments.comics; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.RectF; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.os.Vibrator; import android.support.customtabs.CustomTabsIntent; import android.support.design.widget.Snackbar; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v7.widget.Toolbar; import android.util.Log; import android.util.SparseArray; import android.view.GestureDetector; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.RelativeLayout; import android.widget.TextView; import android.widget.Toast; import com.bumptech.glide.Glide; import com.bumptech.glide.load.engine.DiskCacheStrategy; import com.kogitune.activity_transition.ExitActivityTransition; import com.tap.xkcd_reader.R; import java.io.File; import java.io.FileOutputStream; import java.lang.reflect.Field; import java.util.Arrays; import de.tap.easy_xkcd.Activities.MainActivity; import de.tap.easy_xkcd.CustomTabHelpers.BrowserFallback; import de.tap.easy_xkcd.CustomTabHelpers.CustomTabActivityHelper; import de.tap.easy_xkcd.database.DatabaseManager; import de.tap.easy_xkcd.fragments.overview.OverviewListFragment; import de.tap.easy_xkcd.misc.HackyViewPager; import de.tap.easy_xkcd.utils.Comic; import de.tap.easy_xkcd.utils.PrefHelper; import de.tap.easy_xkcd.utils.ThemePrefs; import uk.co.senab.photoview.PhotoView; import uk.co.senab.photoview.PhotoViewAttacher; /** * Superclass for ComicBrowserFragment, OfflineFragment & FavoritesFragment */ public abstract class ComicFragment extends android.support.v4.app.Fragment { public int lastComicNumber; public int newestComicNumber; public int favoriteIndex = 0; public SparseArray<Comic> comicMap = new SparseArray<>(); protected HackyViewPager pager; protected ComicAdapter adapter; public static boolean fromSearch = false; static final String LAST_FAV = "last fav"; static final String LAST_COMIC = "Last Comic"; protected PrefHelper prefHelper; protected ThemePrefs themePrefs; protected DatabaseManager databaseManager; public ExitActivityTransition transition; protected View inflateLayout(int resId, LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(resId, container, false); setHasOptionsMenu(true); pager = (HackyViewPager) view.findViewById(R.id.pager); pager.setOffscreenPageLimit(2); prefHelper = ((MainActivity) getActivity()).getPrefHelper(); themePrefs = ((MainActivity) getActivity()).getThemePrefs(); databaseManager = ((MainActivity) getActivity()).getDatabaseManager(); if (!(this instanceof FavoritesFragment)) { if (savedInstanceState != null) { lastComicNumber = savedInstanceState.getInt(LAST_COMIC); } else if (lastComicNumber == 0) { lastComicNumber = prefHelper.getLastComic(); } if (MainActivity.overviewLaunch) { MainActivity.overviewLaunch = false; ((MainActivity) getActivity()).showOverview(false); } } if (((MainActivity) getActivity()).getCurrentFragment() == R.id.nav_browser && prefHelper.subtitleEnabled() && (this instanceof ComicBrowserFragment || this instanceof OfflineFragment)) ((MainActivity) getActivity()).getToolbar().setSubtitle(String.valueOf(lastComicNumber)); return view; } abstract protected class ComicAdapter extends PagerAdapter { protected Context mContext; protected LayoutInflater mLayoutInflater; protected Boolean fingerLifted = true; protected int count; public ComicAdapter(Context context, int count) { this.count = count; mContext = context; mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } protected View setupPager(ViewGroup container, int position) { final View itemView = mLayoutInflater.inflate(R.layout.pager_item, container, false); itemView.setTag(position); final PhotoView pvComic = (PhotoView) itemView.findViewById(R.id.ivComic); final TextView tvAlt = (TextView) itemView.findViewById(R.id.tvAlt); if (!prefHelper.defaultZoom()) { pvComic.setScaleType(ImageView.ScaleType.CENTER_INSIDE); pvComic.setMaximumScale(10f); } if (prefHelper.altByDefault()) tvAlt.setVisibility(View.VISIBLE); pvComic.setOnDoubleTapListener(new GestureDetector.OnDoubleTapListener() { @Override public boolean onDoubleTap(MotionEvent e) { if (pvComic.getScale() < 0.5f * pvComic.getMaximumScale()) { pvComic.setScale(0.5f * pvComic.getMaximumScale(), true); } else if (pvComic.getScale() < pvComic.getMaximumScale()) { pvComic.setScale(pvComic.getMaximumScale(), true); } else { pvComic.setScale(1.0f, true); } return true; } @Override public boolean onSingleTapConfirmed(MotionEvent e) { if (!prefHelper.altLongTap()) { if (prefHelper.classicAltStyle()) { toggleVisibility(tvAlt); } else { android.support.v7.app.AlertDialog.Builder mDialog = new android.support.v7.app.AlertDialog.Builder( getActivity()); mDialog.setMessage(tvAlt.getText()); mDialog.show(); } } return false; } @Override public boolean onDoubleTapEvent(MotionEvent e) { if (e.getAction() == MotionEvent.ACTION_UP) fingerLifted = true; if (e.getAction() == MotionEvent.ACTION_DOWN) fingerLifted = false; return false; } }); pvComic.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View v) { if (fingerLifted && prefHelper.altLongTap()) { if (prefHelper.altVibration()) ((Vibrator) getActivity().getSystemService(MainActivity.VIBRATOR_SERVICE)).vibrate(10); setAltText(false); } return true; } }); if (themePrefs.invertColors()) pvComic.setColorFilter(themePrefs.getNegativeColorFilter()); if (prefHelper.scrollDisabledWhileZoom() && prefHelper.defaultZoom()) pvComic.setOnMatrixChangeListener(new PhotoViewAttacher.OnMatrixChangedListener() { @Override public void onMatrixChanged(RectF rectF) { if (pvComic.getScale() > 1.4) { pager.setLocked(true); } else { pager.setLocked(false); } } }); return itemView; } protected int getGifId(int position) { switch (position + 1) { case 961: return R.raw.eternal_flame; case 1116: return R.raw.traffic_lights; case 1264: return R.raw.slideshow; default: return 0; } } @Override public boolean isViewFromObject(View view, Object object) { return view == object; } @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView((RelativeLayout) object); } } protected void animateToolbar() { Toolbar toolbar = ((MainActivity) getActivity()).getToolbar(); if (toolbar.getAlpha() == 0) { toolbar.setTranslationY(-300); toolbar.animate().setDuration(300).translationY(0).alpha(1); View view; for (int i = 0; i < toolbar.getChildCount(); i++) { view = toolbar.getChildAt(i); view.setTranslationY(-300); view.animate().setStartDelay(50 * (i + 1)).setDuration(70 * (i + 1)).translationY(0); } } } protected void saveComic(int number, Bitmap bitmap) { try { File sdCard = prefHelper.getOfflinePath(); File dir = new File(sdCard.getAbsolutePath() + "/easy xkcd"); //noinspection ResultOfMethodCallIgnored dir.mkdirs(); File file = new File(dir, String.valueOf(number) + ".png"); FileOutputStream fos = new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos); fos.flush(); fos.close(); } catch (Exception e) { Log.e("Error", "Saving to external storage failed"); try { FileOutputStream fos = getActivity().openFileOutput(String.valueOf(number), Context.MODE_PRIVATE); bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos); fos.close(); } catch (Exception e2) { e2.printStackTrace(); } } } public class SaveComicImageTask extends AsyncTask<Boolean, Void, Void> { protected int mAddedNumber = lastComicNumber; private Bitmap mBitmap; private Comic mAddedComic; private boolean downloadImage; @Override protected Void doInBackground(Boolean... downloadImage) { this.downloadImage = downloadImage[0]; if (this.downloadImage) { mAddedComic = comicMap.get(lastComicNumber); try { String url = mAddedComic.getComicData()[2]; mBitmap = Glide.with(getActivity()).load(url).asBitmap() .diskCacheStrategy(DiskCacheStrategy.SOURCE).into(-1, -1).get(); } catch (Exception e) { databaseManager.setFavorite(mAddedNumber, false); Log.e("Saving Image failed!", e.toString()); } prefHelper.addTitle(mAddedComic.getComicData()[0], mAddedNumber); prefHelper.addAlt(mAddedComic.getComicData()[1], mAddedNumber); } databaseManager.setFavorite(mAddedNumber, true); return null; } @Override protected void onPostExecute(Void dummy) { if (downloadImage) { saveComic(mAddedNumber, mBitmap); } //refresh the FavoritesFragment FavoritesFragment f = (FavoritesFragment) getActivity().getSupportFragmentManager() .findFragmentByTag("favorites"); if (f != null) f.refresh(); //Sometimes the floating action button does not animate back to the bottom when the snackbar is dismissed, so force it to its original position ((MainActivity) getActivity()).getFab().forceLayout(); getActivity().invalidateOptionsMenu(); } } protected class DeleteComicImageTask extends AsyncTask<Boolean, Void, Void> { protected int mRemovedNumber = lastComicNumber; protected View.OnClickListener oc; @Override protected Void doInBackground(final Boolean... deleteImage) { if (deleteImage[0]) { //delete the image from internal storage getActivity().deleteFile(String.valueOf(mRemovedNumber)); //delete from external storage File sdCard = prefHelper.getOfflinePath(); File dir = new File(sdCard.getAbsolutePath() + "/easy xkcd"); File file = new File(dir, String.valueOf(mRemovedNumber) + ".png"); //noinspection ResultOfMethodCallIgnored file.delete(); prefHelper.addTitle("", mRemovedNumber); prefHelper.addAlt("", mRemovedNumber); } oc = new View.OnClickListener() { @Override public void onClick(View v) { new SaveComicImageTask().execute(deleteImage[0]); } }; databaseManager.setFavorite(mRemovedNumber, false); Snackbar.make(((MainActivity) getActivity()).getFab(), R.string.snackbar_remove, Snackbar.LENGTH_LONG) .setAction(R.string.snackbar_undo, oc).show(); return null; } @Override protected void onPostExecute(Void v) { //refresh the favorites fragment FavoritesFragment f = (FavoritesFragment) getActivity().getSupportFragmentManager() .findFragmentByTag("favorites"); if (f != null) f.refresh(); } } public boolean zoomReset() { int index; if (this instanceof FavoritesFragment) index = favoriteIndex; else index = lastComicNumber - 1; if (prefHelper.altBackButton() && !(pager.findViewWithTag(index).findViewById(R.id.tvAlt).getVisibility() == View.VISIBLE)) return setAltText(false); PhotoView pv = (PhotoView) pager.findViewWithTag(index).findViewById(R.id.ivComic); float scale = pv.getScale(); if (scale != 1f) { pv.setScale(1f, true); return true; } else { return false; } } protected boolean explainComic(int number) { String url = "https://explainxkcd.com/" + String.valueOf(number); CustomTabsIntent.Builder intentBuilder = new CustomTabsIntent.Builder(); intentBuilder.setToolbarColor(themePrefs.getPrimaryColor(false)); CustomTabActivityHelper.openCustomTab(getActivity(), intentBuilder.build(), Uri.parse(url), new BrowserFallback()); return true; } protected boolean openComicInBrowser(int number) { Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://xkcd.com/" + String.valueOf(number))); startActivity(intent); return true; } protected boolean showTranscript(String trans) { android.support.v7.app.AlertDialog.Builder mDialog = new android.support.v7.app.AlertDialog.Builder( getActivity()); mDialog.setMessage(trans); mDialog.show(); return true; } protected boolean addBookmark(int bookmark) { if (prefHelper.getBookmark() == 0) Toast.makeText(getActivity(), R.string.bookmark_toast, Toast.LENGTH_LONG).show(); prefHelper.setBookmark(bookmark); OverviewListFragment.bookmark = bookmark; return true; } protected void shareComicUrl(Comic comic) { //shares the comics url along with its title Intent share = new Intent(android.content.Intent.ACTION_SEND); share.setType("text/plain"); share.putExtra(Intent.EXTRA_SUBJECT, comic.getComicData()[0]); if (prefHelper.shareMobile()) { share.putExtra(Intent.EXTRA_TEXT, "https://m.xkcd.com/" + comic.getComicNumber() + "/"); } else { share.putExtra(Intent.EXTRA_TEXT, "https://xkcd.com/" + comic.getComicNumber() + "/"); } startActivity(Intent.createChooser(share, this.getResources().getString(R.string.share_url))); } protected void shareComicImage(Uri uri, Comic comic) { Intent share = new Intent(Intent.ACTION_SEND); share.setType("image/*"); share.putExtra(Intent.EXTRA_STREAM, uri); share.putExtra(Intent.EXTRA_SUBJECT, comic.getComicData()[0]); if (prefHelper.shareAlt()) { share.putExtra(Intent.EXTRA_TEXT, comic.getComicData()[1]); } startActivity(Intent.createChooser(share, this.getResources().getString(R.string.share_image))); } protected Uri getURI(int number) { File sdCard = prefHelper.getOfflinePath(); File dir = new File(sdCard.getAbsolutePath() + "/easy xkcd"); File path = new File(dir, String.valueOf(number) + ".png"); return Uri.fromFile(path); } public void getPreviousRandom() { lastComicNumber = prefHelper.getPreviousRandom(lastComicNumber); pager.setCurrentItem(lastComicNumber - 1, false); } public boolean getRandomComic() { lastComicNumber = prefHelper.getRandomNumber(lastComicNumber); pager.setCurrentItem(lastComicNumber - 1, false); return true; } protected boolean getLatestComic() { lastComicNumber = newestComicNumber; pager.setCurrentItem(lastComicNumber - 1, false); return true; } protected void scrollViewPager() { if (lastComicNumber != 0) { try { Field field = ViewPager.class.getDeclaredField("mRestoredCurItem"); field.setAccessible(true); field.set(pager, lastComicNumber - 1); } catch (Exception e) { e.printStackTrace(); } } } abstract public void updatePager(); protected boolean setAltText(boolean fromMenu) { //If the user selected the menu item for the first time, show the toast if (prefHelper.showAltTip() && fromMenu) { Toast toast = Toast.makeText(getActivity(), R.string.action_alt_tip, Toast.LENGTH_LONG); toast.show(); prefHelper.setAltTip(false); } //Show alt text int index; if (this instanceof FavoritesFragment) index = favoriteIndex; else index = lastComicNumber - 1; TextView tvAlt = (TextView) pager.findViewWithTag(index).findViewById(R.id.tvAlt); if (prefHelper.classicAltStyle()) { toggleVisibility(tvAlt); } else { android.support.v7.app.AlertDialog.Builder mDialog = new android.support.v7.app.AlertDialog.Builder( getActivity()); mDialog.setMessage(tvAlt.getText()); mDialog.show(); } return true; } protected void toggleVisibility(View view) { // Switches a view's visibility between GONE and VISIBLE if (view.getVisibility() == View.GONE) { view.setVisibility(View.VISIBLE); } else { view.setVisibility(View.GONE); } } protected void pageSelected(int position) { try { getActivity().invalidateOptionsMenu(); } catch (NullPointerException e) { e.printStackTrace(); } databaseManager.setRead(position + 1, true); lastComicNumber = position + 1; if (prefHelper.subtitleEnabled() && ((MainActivity) getActivity()).getCurrentFragment() == R.id.nav_browser) ((MainActivity) getActivity()).getToolbar().setSubtitle(String.valueOf(lastComicNumber)); animateToolbar(); } @Override public void onStop() { if (!(this instanceof FavoritesFragment)) prefHelper.setLastComic(lastComicNumber); super.onStop(); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.action_alt: return setAltText(true); case R.id.action_explain: return explainComic(lastComicNumber); case R.id.action_latest: return getLatestComic(); case R.id.action_browser: return openComicInBrowser(lastComicNumber); case R.id.action_trans: return showTranscript(comicMap.get(lastComicNumber).getTranscript()); case R.id.action_boomark: return addBookmark(lastComicNumber); } return super.onOptionsItemSelected(item); } @Override public void onPrepareOptionsMenu(Menu menu) { //Update the favorites icon MenuItem fav = menu.findItem(R.id.action_favorite); if (databaseManager.checkFavorite(lastComicNumber)) { fav.setIcon(R.drawable.ic_action_favorite); fav.setTitle(R.string.action_favorite_remove); } else { fav.setIcon(R.drawable.ic_favorite_outline); fav.setTitle(R.string.action_favorite); } //If the FAB is visible, hide the random comic menu item if (((MainActivity) getActivity()).getFab().getVisibility() == View.GONE) { menu.findItem(R.id.action_random).setVisible(true); } else { menu.findItem(R.id.action_random).setVisible(false); } menu.findItem(R.id.action_alt).setVisible(prefHelper.showAltTip()); if (Arrays.binarySearch(getResources().getIntArray(R.array.interactive_comics), lastComicNumber) >= 0) menu.findItem(R.id.action_browser).setVisible(true); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { if (!(this instanceof FavoritesFragment)) inflater.inflate(R.menu.menu_comic_fragment, menu); super.onCreateOptionsMenu(menu, inflater); } @Override public void onSaveInstanceState(Bundle savedInstanceState) { savedInstanceState.putInt(LAST_COMIC, lastComicNumber); savedInstanceState.putInt(LAST_FAV, favoriteIndex); super.onSaveInstanceState(savedInstanceState); } public void scrollTo(int pos, boolean smooth) { pager.setCurrentItem(pos, smooth); } }