Java tutorial
/* * Twidere - Twitter client for Android * * Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com> * * 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 org.mariotaku.twidere.fragment.support; import android.app.AlertDialog; import android.app.Dialog; import android.app.NotificationManager; import android.content.ContentResolver; import android.content.Context; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.content.Intent; import android.content.SharedPreferences; import android.database.Cursor; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.os.Handler; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.app.DialogFragment; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.util.Log; import android.util.SparseBooleanArray; import android.view.ActionMode; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView.MultiChoiceModeListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import org.mariotaku.querybuilder.Columns.Column; import org.mariotaku.querybuilder.Expression; import org.mariotaku.querybuilder.RawItemArray; import org.mariotaku.twidere.Constants; import org.mariotaku.twidere.R; import org.mariotaku.twidere.adapter.DraftsAdapter; import org.mariotaku.twidere.model.DraftItem; import org.mariotaku.twidere.model.ParcelableMediaUpdate; import org.mariotaku.twidere.model.ParcelableStatusUpdate; import org.mariotaku.twidere.provider.TwidereDataStore.Drafts; import org.mariotaku.twidere.util.AsyncTaskUtils; import org.mariotaku.twidere.util.AsyncTwitterWrapper; import org.mariotaku.twidere.util.ThemeUtils; import java.io.File; import java.util.ArrayList; import java.util.List; import static org.mariotaku.twidere.util.Utils.getDefaultTextSize; public class DraftsFragment extends BaseSupportFragment implements Constants, LoaderCallbacks<Cursor>, OnItemClickListener, MultiChoiceModeListener { private ContentResolver mResolver; private SharedPreferences mPreferences; private DraftsAdapter mAdapter; private ListView mListView; private View mEmptyView; private TextView mEmptyText; private ImageView mEmptyIcon; private View mListContainer, mProgressContainer; private float mTextSize; @Override public boolean onCreateActionMode(final ActionMode mode, final Menu menu) { mode.getMenuInflater().inflate(R.menu.action_multi_select_drafts, menu); return true; } @Override public boolean onPrepareActionMode(final ActionMode mode, final Menu menu) { updateTitle(mode); return true; } @Override public boolean onActionItemClicked(final ActionMode mode, final MenuItem item) { switch (item.getItemId()) { case MENU_DELETE: { final DeleteDraftsConfirmDialogFragment f = new DeleteDraftsConfirmDialogFragment(); final Bundle args = new Bundle(); args.putLongArray(EXTRA_IDS, mListView.getCheckedItemIds()); f.setArguments(args); f.show(getChildFragmentManager(), "delete_drafts_confirm"); break; } case MENU_SEND: { final Cursor c = mAdapter.getCursor(); if (c == null || c.isClosed()) return false; final SparseBooleanArray checked = mListView.getCheckedItemPositions(); final List<DraftItem> list = new ArrayList<>(); final DraftItem.CursorIndices indices = new DraftItem.CursorIndices(c); for (int i = 0, j = checked.size(); i < j; i++) { if (checked.valueAt(i) && c.moveToPosition(checked.keyAt(i))) { list.add(new DraftItem(c, indices)); } } if (sendDrafts(list)) { final Expression where = Expression.in(new Column(Drafts._ID), new RawItemArray(mListView.getCheckedItemIds())); mResolver.delete(Drafts.CONTENT_URI, where.getSQL(), null); } break; } default: { return false; } } mode.finish(); return true; } @Override public void onDestroyActionMode(final ActionMode mode) { } @Override public Loader<Cursor> onCreateLoader(final int id, final Bundle args) { final Uri uri = Drafts.CONTENT_URI_UNSENT; final String[] cols = Drafts.COLUMNS; final String orderBy = Drafts.TIMESTAMP + " DESC"; return new CursorLoader(getActivity(), uri, cols, null, null, orderBy); } @Override public void onLoadFinished(final Loader<Cursor> loader, final Cursor cursor) { mAdapter.swapCursor(cursor); setListShown(true); } @Override public void onLoaderReset(final Loader<Cursor> loader) { mAdapter.swapCursor(null); } @Override public void onItemCheckedStateChanged(final ActionMode mode, final int position, final long id, final boolean checked) { updateTitle(mode); } @Override public void onItemClick(final AdapterView<?> view, final View child, final int position, final long id) { final Cursor c = mAdapter.getCursor(); if (c == null || c.isClosed() || !c.moveToPosition(position)) return; final DraftItem item = new DraftItem(c, new DraftItem.CursorIndices(c)); if (item.action_type == Drafts.ACTION_UPDATE_STATUS || item.action_type <= 0) { editDraft(item); } } @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_drafts, container, false); } @Override public void onActivityCreated(final Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mResolver = getContentResolver(); mPreferences = getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE); mTextSize = mPreferences.getInt(KEY_TEXT_SIZE, getDefaultTextSize(getActivity())); mAdapter = new DraftsAdapter(getActivity()); mListView.setAdapter(mAdapter); mListView.setEmptyView(mEmptyView); mListView.setOnItemClickListener(this); mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL); mListView.setMultiChoiceModeListener(this); mEmptyIcon.setImageResource(R.drawable.ic_info_draft); mEmptyText.setText(R.string.drafts_hint_messages); getLoaderManager().initLoader(0, null, this); setListShown(false); } @Override public void onStart() { final AsyncTwitterWrapper twitter = getTwitterWrapper(); if (twitter != null) { twitter.clearNotificationAsync(NOTIFICATION_ID_DRAFTS); } super.onStart(); } @Override public void onResume() { super.onResume(); final float text_size = mPreferences.getInt(KEY_TEXT_SIZE, getDefaultTextSize(getActivity())); mAdapter.setTextSize(text_size); if (mTextSize != text_size) { mTextSize = text_size; mListView.invalidateViews(); } } @Override public void onStop() { super.onStop(); } @Override public void onBaseViewCreated(View view, Bundle savedInstanceState) { super.onBaseViewCreated(view, savedInstanceState); mListView = (ListView) view.findViewById(android.R.id.list); mEmptyView = view.findViewById(android.R.id.empty); mEmptyText = (TextView) view.findViewById(R.id.empty_text); mEmptyIcon = (ImageView) view.findViewById(R.id.empty_icon); mProgressContainer = view.findViewById(R.id.progress_container); mListContainer = view.findViewById(R.id.list_container); } public void setListShown(boolean listShown) { mListContainer.setVisibility(listShown ? View.VISIBLE : View.GONE); mProgressContainer.setVisibility(listShown ? View.GONE : View.VISIBLE); mEmptyView.setVisibility(listShown && mAdapter.isEmpty() ? View.VISIBLE : View.GONE); } private void editDraft(final DraftItem draft) { final Intent intent = new Intent(INTENT_ACTION_EDIT_DRAFT); final Bundle bundle = new Bundle(); bundle.putParcelable(EXTRA_DRAFT, draft); intent.putExtras(bundle); mResolver.delete(Drafts.CONTENT_URI, Expression.equals(Drafts._ID, draft._id).getSQL(), null); startActivityForResult(intent, REQUEST_COMPOSE); } private boolean sendDrafts(final List<DraftItem> list) { final AsyncTwitterWrapper twitter = getTwitterWrapper(); if (twitter == null) return false; for (final DraftItem item : list) { if (item.action_type == Drafts.ACTION_UPDATE_STATUS || item.action_type <= 0) { twitter.updateStatusesAsync(new ParcelableStatusUpdate(getActivity(), item)); } else if (item.action_type == Drafts.ACTION_SEND_DIRECT_MESSAGE) { final long recipientId = item.action_extras.optLong(EXTRA_RECIPIENT_ID); if (item.account_ids == null || item.account_ids.length <= 0 || recipientId <= 0) { continue; } final long accountId = item.account_ids[0]; final String imageUri = item.media != null && item.media.length > 0 ? item.media[0].uri : null; twitter.sendDirectMessageAsync(accountId, recipientId, item.text, imageUri); } } return true; } private void updateTitle(final ActionMode mode) { if (mListView == null || mode == null) return; final int count = mListView.getCheckedItemCount(); mode.setTitle(getResources().getQuantityString(R.plurals.Nitems_selected, count, count)); } public static class DeleteDraftsConfirmDialogFragment extends BaseSupportDialogFragment implements OnClickListener { @Override public void onClick(final DialogInterface dialog, final int which) { switch (which) { case DialogInterface.BUTTON_POSITIVE: { final Bundle args = getArguments(); if (args == null) return; AsyncTaskUtils.executeTask(new DeleteDraftsTask(getActivity(), args.getLongArray(EXTRA_IDS))); break; } } } @NonNull @Override public Dialog onCreateDialog(final Bundle savedInstanceState) { final Context context = ThemeUtils.getDialogThemedContext(getActivity()); final AlertDialog.Builder builder = new AlertDialog.Builder(context); builder.setMessage(R.string.delete_drafts_confirm); builder.setPositiveButton(android.R.string.ok, this); builder.setNegativeButton(android.R.string.cancel, null); return builder.create(); } } private static class DeleteDraftsTask extends AsyncTask<Object, Object, Integer> { private static final String FRAGMENT_TAG_DELETING_DRAFTS = "deleting_drafts"; private final FragmentActivity mActivity; private final long[] mIds; private final NotificationManager mNotificationManager; private Handler mHandler; private DeleteDraftsTask(final FragmentActivity activity, final long[] ids) { mActivity = activity; mNotificationManager = (NotificationManager) activity.getSystemService(Context.NOTIFICATION_SERVICE); mIds = ids; mHandler = new Handler(activity.getMainLooper()); } @Override protected Integer doInBackground(final Object... params) { final ContentResolver resolver = mActivity.getContentResolver(); final Expression where = Expression.in(new Column(Drafts._ID), new RawItemArray(mIds)); final String[] projection = { Drafts.MEDIA }; final Cursor c = resolver.query(Drafts.CONTENT_URI, projection, where.getSQL(), null, null); final int idxMedia = c.getColumnIndex(Drafts.MEDIA); c.moveToFirst(); while (!c.isAfterLast()) { final ParcelableMediaUpdate[] mediaArray = ParcelableMediaUpdate .fromJSONString(c.getString(idxMedia)); if (mediaArray != null) { for (final ParcelableMediaUpdate media : mediaArray) { final Uri uri = Uri.parse(media.uri); if ("file".equals(uri.getScheme())) { final File file = new File(uri.getPath()); if (!file.delete()) { Log.w(LOGTAG, String.format("Unable to delete %s", file)); } } } } c.moveToNext(); } c.close(); return resolver.delete(Drafts.CONTENT_URI, where.getSQL(), null); } @Override protected void onPreExecute() { super.onPreExecute(); final SupportProgressDialogFragment f = SupportProgressDialogFragment.show(mActivity, FRAGMENT_TAG_DELETING_DRAFTS); f.setCancelable(false); } @Override protected void onPostExecute(final Integer result) { super.onPostExecute(result); final Fragment f = mActivity.getSupportFragmentManager() .findFragmentByTag(FRAGMENT_TAG_DELETING_DRAFTS); if (f instanceof DialogFragment) { ((DialogFragment) f).dismiss(); } for (long id : mIds) { final String tag = Uri.withAppendedPath(Drafts.CONTENT_URI, String.valueOf(id)).toString(); mNotificationManager.cancel(tag, NOTIFICATION_ID_DRAFTS); } } } }