Java tutorial
/** * technoXist * * Copyright (c) 2014 Suyash Bhatt * * Copyright (c) 2012-2013 Frederic Julian * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package com.technoxist.fragment; import android.app.Activity; import android.app.AlertDialog; import android.app.DownloadManager; import android.app.LoaderManager; import android.content.ClipData; import android.content.ClipboardManager; import android.content.ContentResolver; import android.content.ContentUris; import android.content.ContentValues; import android.content.Context; import android.content.CursorLoader; import android.content.DialogInterface; import android.content.Intent; import android.content.Loader; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.drawable.BitmapDrawable; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.util.SparseArray; 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.FrameLayout; import android.widget.Toast; import com.technoxist.Constants; import com.technoxist.MainApplication; import com.technoxist.R; import com.technoxist.activity.BaseActivity; import com.technoxist.provider.FeedData; import com.technoxist.provider.FeedData.EntryColumns; import com.technoxist.provider.FeedData.FeedColumns; import com.technoxist.service.FetcherService; import com.technoxist.utils.PrefUtils; import com.technoxist.utils.UiUtils; import com.technoxist.view.EntryView; public class EntryFragment extends SwipeRefreshFragment implements BaseActivity.OnFullScreenListener, LoaderManager.LoaderCallbacks<Cursor>, EntryView.EntryViewManager { private static final String STATE_BASE_URI = "STATE_BASE_URI"; private static final String STATE_CURRENT_PAGER_POS = "STATE_CURRENT_PAGER_POS"; private static final String STATE_ENTRIES_IDS = "STATE_ENTRIES_IDS"; private static final String STATE_INITIAL_ENTRY_ID = "STATE_INITIAL_ENTRY_ID"; private int mTitlePos = -1, mDatePos, mMobilizedHtmlPos, mAbstractPos, mLinkPos, mIsFavoritePos, mIsReadPos, mEnclosurePos, mAuthorPos, mFeedNamePos, mFeedUrlPos, mFeedIconPos; private int mCurrentPagerPos = -1; private Uri mBaseUri; private long mInitialEntryId = -1; private long[] mEntriesIds; private boolean mFavorite, mPreferFullText = true; private ViewPager mEntryPager; private EntryPagerAdapter mEntryPagerAdapter; private View mCancelFullscreenBtn; private class EntryPagerAdapter extends PagerAdapter { private final SparseArray<EntryView> mEntryViews = new SparseArray<EntryView>(); public EntryPagerAdapter() { } @Override public int getCount() { return mEntriesIds != null ? mEntriesIds.length : 0; } @Override public Object instantiateItem(ViewGroup container, int position) { EntryView view = new EntryView(getActivity()); mEntryViews.put(position, view); container.addView(view); view.setListener(EntryFragment.this); getLoaderManager().restartLoader(position, null, EntryFragment.this); return view; } @Override public void destroyItem(ViewGroup container, int position, Object object) { getLoaderManager().destroyLoader(position); container.removeView((View) object); mEntryViews.delete(position); } @Override public boolean isViewFromObject(View view, Object object) { return view == object; } public void displayEntry(int pagerPos, Cursor newCursor, boolean forceUpdate) { EntryView view = mEntryViews.get(pagerPos); if (view != null) { if (newCursor == null) { newCursor = (Cursor) view.getTag(); // get the old one } if (newCursor != null && newCursor.moveToFirst()) { String contentText = newCursor.getString(mMobilizedHtmlPos); if (contentText == null || (forceUpdate && !mPreferFullText)) { mPreferFullText = false; contentText = newCursor.getString(mAbstractPos); } else { mPreferFullText = true; } if (contentText == null) { contentText = ""; } String author = newCursor.getString(mAuthorPos); long timestamp = newCursor.getLong(mDatePos); String link = newCursor.getString(mLinkPos); String title = newCursor.getString(mTitlePos); String enclosure = newCursor.getString(mEnclosurePos); view.setHtml(mEntriesIds[pagerPos], title, link, contentText, enclosure, author, timestamp, mPreferFullText); view.setTag(newCursor); if (pagerPos == mCurrentPagerPos) { refreshUI(newCursor); } } } } public Cursor getCursor(int pagerPos) { EntryView view = mEntryViews.get(pagerPos); if (view != null) { return (Cursor) view.getTag(); } return null; } public void setUpdatedCursor(int pagerPos, Cursor newCursor) { EntryView view = mEntryViews.get(pagerPos); if (view != null) { Cursor previousUpdatedOne = (Cursor) view.getTag(R.id.updated_cursor); if (previousUpdatedOne != null) { previousUpdatedOne.close(); } view.setTag(newCursor); view.setTag(R.id.updated_cursor, newCursor); } } public void onResume() { if (mEntriesIds != null) { EntryView view = mEntryViews.get(mCurrentPagerPos); if (view != null) { view.onResume(); } } } public void onPause() { for (int i = 0; i < mEntryViews.size(); i++) { mEntryViews.valueAt(i).onPause(); } } } @Override public void onCreate(Bundle savedInstanceState) { setHasOptionsMenu(true); mEntryPagerAdapter = new EntryPagerAdapter(); super.onCreate(savedInstanceState); } @Override public View inflateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_entry, container, true); mCancelFullscreenBtn = rootView.findViewById(R.id.cancelFullscreenBtn); mCancelFullscreenBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { setImmersiveFullScreen(false); } }); mEntryPager = (ViewPager) rootView.findViewById(R.id.pager); //mEntryPager.setPageTransformer(true, new DepthPageTransformer()); mEntryPager.setAdapter(mEntryPagerAdapter); if (savedInstanceState != null) { mBaseUri = savedInstanceState.getParcelable(STATE_BASE_URI); mEntriesIds = savedInstanceState.getLongArray(STATE_ENTRIES_IDS); mInitialEntryId = savedInstanceState.getLong(STATE_INITIAL_ENTRY_ID); mCurrentPagerPos = savedInstanceState.getInt(STATE_CURRENT_PAGER_POS); mEntryPager.getAdapter().notifyDataSetChanged(); mEntryPager.setCurrentItem(mCurrentPagerPos); } mEntryPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int i, float v, int i2) { } @Override public void onPageSelected(int i) { mCurrentPagerPos = i; mEntryPagerAdapter.onPause(); // pause all webviews mEntryPagerAdapter.onResume(); // resume the current webview refreshUI(mEntryPagerAdapter.getCursor(i)); } @Override public void onPageScrollStateChanged(int i) { } }); disableSwipe(); return rootView; } @Override public void onSaveInstanceState(Bundle outState) { outState.putParcelable(STATE_BASE_URI, mBaseUri); outState.putLongArray(STATE_ENTRIES_IDS, mEntriesIds); outState.putLong(STATE_INITIAL_ENTRY_ID, mInitialEntryId); outState.putInt(STATE_CURRENT_PAGER_POS, mCurrentPagerPos); super.onSaveInstanceState(outState); } @Override public void onAttach(Activity activity) { super.onAttach(activity); ((BaseActivity) activity).setOnFullscreenListener(this); } @Override public void onDetach() { ((BaseActivity) getActivity()).setOnFullscreenListener(null); super.onDetach(); } @Override public void onResume() { super.onResume(); mEntryPagerAdapter.onResume(); if (((BaseActivity) getActivity()).isFullScreen()) { mCancelFullscreenBtn.setVisibility(View.VISIBLE); } else { mCancelFullscreenBtn.setVisibility(View.GONE); } } @Override public void onPause() { super.onPause(); mEntryPagerAdapter.onPause(); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.entry, menu); if (mFavorite) { MenuItem item = menu.findItem(R.id.menu_star); item.setIcon(R.drawable.rating_important); } super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (mEntriesIds != null) { Activity activity = getActivity(); switch (item.getItemId()) { case R.id.menu_star: { mFavorite = !mFavorite; if (mFavorite) { item.setIcon(R.drawable.rating_important); } else { item.setTitle(R.string.menu_star).setIcon(R.drawable.rating_not_important); } final Uri uri = ContentUris.withAppendedId(mBaseUri, mEntriesIds[mCurrentPagerPos]); new Thread() { @Override public void run() { ContentValues values = new ContentValues(); values.put(EntryColumns.IS_FAVORITE, mFavorite ? 1 : 0); ContentResolver cr = MainApplication.getContext().getContentResolver(); cr.update(uri, values, null, null); // Update the cursor Cursor updatedCursor = cr.query(uri, null, null, null, null); updatedCursor.moveToFirst(); mEntryPagerAdapter.setUpdatedCursor(mCurrentPagerPos, updatedCursor); } }.start(); break; } case R.id.menu_share: { Cursor cursor = mEntryPagerAdapter.getCursor(mCurrentPagerPos); String link = cursor.getString(mLinkPos); if (link != null) { String title = cursor.getString(mTitlePos); startActivity(Intent.createChooser( new Intent(Intent.ACTION_SEND).putExtra(Intent.EXTRA_SUBJECT, title) .putExtra(Intent.EXTRA_TEXT, link).setType(Constants.MIMETYPE_TEXT_PLAIN), getString(R.string.menu_share))); } break; } case R.id.menu_full_screen: { setImmersiveFullScreen(true); break; } case R.id.menu_copy_clipboard: { Cursor cursor = mEntryPagerAdapter.getCursor(mCurrentPagerPos); String link = cursor.getString(mLinkPos); ClipboardManager clipboard = (ClipboardManager) activity .getSystemService(Context.CLIPBOARD_SERVICE); ClipData clip = ClipData.newPlainText("Copied Text", link); clipboard.setPrimaryClip(clip); Toast.makeText(activity, R.string.copied_clipboard, Toast.LENGTH_SHORT).show(); break; } case R.id.menu_mark_as_unread: { final Uri uri = ContentUris.withAppendedId(mBaseUri, mEntriesIds[mCurrentPagerPos]); new Thread() { @Override public void run() { ContentResolver cr = MainApplication.getContext().getContentResolver(); cr.update(uri, FeedData.getUnreadContentValues(), null, null); } }.start(); activity.finish(); break; } } } return true; } public void setData(Uri uri) { mCurrentPagerPos = -1; mBaseUri = FeedData.EntryColumns.PARENT_URI(uri.getPath()); try { mInitialEntryId = Long.parseLong(uri.getLastPathSegment()); } catch (Exception unused) { mInitialEntryId = -1; } if (mBaseUri != null) { Bundle b = getActivity().getIntent().getExtras(); String whereClause = FeedData.shouldShowReadEntries(mBaseUri) || (b != null && b.getBoolean(Constants.INTENT_FROM_WIDGET, false)) ? null : EntryColumns.WHERE_UNREAD; String entriesOrder = PrefUtils.getBoolean(PrefUtils.DISPLAY_OLDEST_FIRST, false) ? Constants.DB_ASC : Constants.DB_DESC; // Load the entriesIds list. Should be in a loader... but I was too lazy to do so Cursor entriesCursor = MainApplication.getContext().getContentResolver().query(mBaseUri, EntryColumns.PROJECTION_ID, whereClause, null, EntryColumns.DATE + entriesOrder); if (entriesCursor != null && entriesCursor.getCount() > 0) { mEntriesIds = new long[entriesCursor.getCount()]; int i = 0; while (entriesCursor.moveToNext()) { mEntriesIds[i] = entriesCursor.getLong(0); if (mEntriesIds[i] == mInitialEntryId) { mCurrentPagerPos = i; // To immediately display the good entry } i++; } entriesCursor.close(); } } else { mEntriesIds = null; } mEntryPagerAdapter.notifyDataSetChanged(); if (mCurrentPagerPos != -1) { mEntryPager.setCurrentItem(mCurrentPagerPos); } } private void refreshUI(Cursor entryCursor) { if (entryCursor != null) { String feedTitle = entryCursor.isNull(mFeedNamePos) ? entryCursor.getString(mFeedUrlPos) : entryCursor.getString(mFeedNamePos); BaseActivity activity = (BaseActivity) getActivity(); activity.setTitle(feedTitle); byte[] iconBytes = entryCursor.getBlob(mFeedIconPos); Bitmap bitmap = UiUtils.getScaledBitmap(iconBytes, 24); if (bitmap != null) { activity.getActionBar().setIcon(new BitmapDrawable(getResources(), bitmap)); } else { activity.getActionBar().setIcon(R.drawable.icon); } mFavorite = entryCursor.getInt(mIsFavoritePos) == 1; activity.invalidateOptionsMenu(); // Listen the mobilizing task if (FetcherService.hasMobilizationTask(mEntriesIds[mCurrentPagerPos])) { hideSwipeProgress(); // Start services here if not already started to avoid an infinite loading if (!PrefUtils.getBoolean(PrefUtils.IS_REFRESHING, false)) { MainApplication.getContext() .startService(new Intent(MainApplication.getContext(), FetcherService.class) .setAction(FetcherService.ACTION_MOBILIZE_FEEDS)); } } else { hideSwipeProgress(); } // Mark the article as read if (entryCursor.getInt(mIsReadPos) != 1) { final Uri uri = ContentUris.withAppendedId(mBaseUri, mEntriesIds[mCurrentPagerPos]); new Thread(new Runnable() { @Override public void run() { ContentResolver cr = MainApplication.getContext().getContentResolver(); cr.update(uri, FeedData.getReadContentValues(), null, null); // Update the cursor Cursor updatedCursor = cr.query(uri, null, null, null, null); updatedCursor.moveToFirst(); mEntryPagerAdapter.setUpdatedCursor(mCurrentPagerPos, updatedCursor); } }).start(); } } } private void showEnclosure(Uri uri, String enclosure, int position1, int position2) { try { startActivityForResult(new Intent(Intent.ACTION_VIEW).setDataAndType(uri, enclosure.substring(position1 + 3, position2)), 0); } catch (Exception e) { try { startActivityForResult(new Intent(Intent.ACTION_VIEW, uri), 0); // fallbackmode - let the browser handle this } catch (Throwable t) { Toast.makeText(getActivity(), t.getMessage(), Toast.LENGTH_LONG).show(); } } } private void setImmersiveFullScreen(boolean fullScreen) { BaseActivity activity = (BaseActivity) getActivity(); activity.setImmersiveFullScreen(fullScreen); } @Override public void onClickEnclosure() { getActivity().runOnUiThread(new Runnable() { @Override public void run() { final String enclosure = mEntryPagerAdapter.getCursor(mCurrentPagerPos).getString(mEnclosurePos); final int position1 = enclosure.indexOf(Constants.ENCLOSURE_SEPARATOR); final int position2 = enclosure.indexOf(Constants.ENCLOSURE_SEPARATOR, position1 + 3); final Uri uri = Uri.parse(enclosure.substring(0, position1)); final String filename = uri.getLastPathSegment(); new AlertDialog.Builder(getActivity()).setTitle(R.string.open_enclosure) .setMessage(getString(R.string.file) + ": " + filename) .setPositiveButton(R.string.open_link, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { showEnclosure(uri, enclosure, position1, position2); } }).setNegativeButton(R.string.download_and_save, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { try { DownloadManager.Request r = new DownloadManager.Request(uri); r.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, filename); r.allowScanningByMediaScanner(); r.setNotificationVisibility( DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); DownloadManager dm = (DownloadManager) MainApplication.getContext() .getSystemService(Context.DOWNLOAD_SERVICE); dm.enqueue(r); } catch (Exception e) { Toast.makeText(getActivity(), R.string.error, Toast.LENGTH_LONG).show(); } } }).show(); } }); } @Override public void onStartVideoFullScreen() { BaseActivity activity = (BaseActivity) getActivity(); activity.setNormalFullScreen(true); } @Override public void onEndVideoFullScreen() { BaseActivity activity = (BaseActivity) getActivity(); activity.setNormalFullScreen(false); } @Override public FrameLayout getVideoLayout() { View layout = getView(); return (layout == null ? null : (FrameLayout) layout.findViewById(R.id.videoLayout)); } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { CursorLoader cursorLoader = new CursorLoader(getActivity(), EntryColumns.CONTENT_URI(mEntriesIds[id]), null, null, null, null); cursorLoader.setUpdateThrottle(1000); return cursorLoader; } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) { if (mBaseUri != null && cursor != null) { // can be null if we do a setData(null) before cursor.moveToFirst(); if (mTitlePos == -1) { mTitlePos = cursor.getColumnIndex(EntryColumns.TITLE); mDatePos = cursor.getColumnIndex(EntryColumns.DATE); mAbstractPos = cursor.getColumnIndex(EntryColumns.ABSTRACT); mMobilizedHtmlPos = cursor.getColumnIndex(EntryColumns.MOBILIZED_HTML); mLinkPos = cursor.getColumnIndex(EntryColumns.LINK); mIsFavoritePos = cursor.getColumnIndex(EntryColumns.IS_FAVORITE); mIsReadPos = cursor.getColumnIndex(EntryColumns.IS_READ); mEnclosurePos = cursor.getColumnIndex(EntryColumns.ENCLOSURE); mAuthorPos = cursor.getColumnIndex(EntryColumns.AUTHOR); mFeedNamePos = cursor.getColumnIndex(FeedColumns.NAME); mFeedUrlPos = cursor.getColumnIndex(FeedColumns.URL); mFeedIconPos = cursor.getColumnIndex(FeedColumns.ICON); } int position = loader.getId(); if (position != -1) { mEntryPagerAdapter.displayEntry(position, cursor, false); } } } @Override public void onLoaderReset(Loader<Cursor> loader) { mEntryPagerAdapter.setUpdatedCursor(loader.getId(), null); } @Override public void onFullScreenEnabled(boolean isImmersive, boolean isImmersiveFallback) { if (!isImmersive && isImmersiveFallback) { mCancelFullscreenBtn.setVisibility(View.VISIBLE); } } @Override public void onFullScreenDisabled() { mCancelFullscreenBtn.setVisibility(View.GONE); } @Override public void onRefresh() { // Nothing to do } }