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.activity; import android.app.LoaderManager; import android.content.CursorLoader; import android.content.Intent; import android.content.Loader; import android.content.SharedPreferences; import android.content.res.Configuration; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.drawable.BitmapDrawable; import android.net.Uri; import android.os.Bundle; import android.os.Handler; import android.support.v4.app.ActionBarDrawerToggle; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView; import android.widget.ListView; import android.widget.Toast; import com.technoxist.Constants; import com.technoxist.MainApplication; import com.technoxist.R; import com.technoxist.adapter.DrawerAdapter; import com.technoxist.fragment.EntriesListFragment; import com.technoxist.provider.FeedData.EntryColumns; import com.technoxist.provider.FeedData.FeedColumns; import com.technoxist.service.FetcherService; import com.technoxist.service.RefreshService; import com.technoxist.utils.PrefUtils; import com.technoxist.utils.UiUtils; public class HomeActivity extends BaseActivity implements LoaderManager.LoaderCallbacks<Cursor> { private static final String STATE_CURRENT_DRAWER_POS = "STATE_CURRENT_DRAWER_POS"; private static final String FEED_UNREAD_NUMBER = "(SELECT " + Constants.DB_COUNT + " FROM " + EntryColumns.TABLE_NAME + " WHERE " + EntryColumns.IS_READ + " IS NULL AND " + EntryColumns.FEED_ID + '=' + FeedColumns.TABLE_NAME + '.' + FeedColumns._ID + ')'; private static final int LOADER_ID = 0; private final SharedPreferences.OnSharedPreferenceChangeListener mShowReadListener = new SharedPreferences.OnSharedPreferenceChangeListener() { @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { if (PrefUtils.SHOW_READ.equals(key)) { getLoaderManager().restartLoader(LOADER_ID, null, HomeActivity.this); } } }; private EntriesListFragment mEntriesFragment; private DrawerLayout mDrawerLayout; private ListView mDrawerList; private DrawerAdapter mDrawerAdapter; private ActionBarDrawerToggle mDrawerToggle; private CharSequence mTitle; private BitmapDrawable mIcon; private int mCurrentDrawerPos, N; private boolean mIsDrawerMoving = false; private boolean mCanQuit = false; @Override protected void onCreate(Bundle savedInstanceState) { UiUtils.setPreferenceTheme(this); super.onCreate(savedInstanceState); if (PrefUtils.getBoolean(PrefUtils.LIGHT_THEME, true)) { getWindow().setBackgroundDrawableResource(R.color.light_entry_list_background); } else { getWindow().setBackgroundDrawableResource(R.color.dark_entry_list_background); } setContentView(R.layout.activity_home); mEntriesFragment = (EntriesListFragment) getFragmentManager().findFragmentById(R.id.entries_list_fragment); mTitle = getTitle(); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerList = (ListView) findViewById(R.id.left_drawer); mDrawerList.setChoiceMode(ListView.CHOICE_MODE_SINGLE); mDrawerList.setOnItemClickListener(new ListView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { selectDrawerItem(position); mDrawerLayout.postDelayed(new Runnable() { @Override public void run() { mDrawerLayout.closeDrawer(mDrawerList); } }, 50); } }); mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); getActionBar().setDisplayHomeAsUpEnabled(true); getActionBar().setHomeButtonEnabled(true); int drawerIcon = R.drawable.ic_drawer_light; if (!PrefUtils.getBoolean(PrefUtils.LIGHT_THEME, true)) { drawerIcon = R.drawable.ic_drawer_dark; } mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, drawerIcon, R.string.drawer_open, R.string.drawer_close) { @Override public void onDrawerStateChanged(int newState) { if (mIsDrawerMoving && newState == DrawerLayout.STATE_IDLE) { mIsDrawerMoving = false; invalidateOptionsMenu(); } else if (!mIsDrawerMoving) { mIsDrawerMoving = true; invalidateOptionsMenu(); } super.onDrawerStateChanged(newState); } }; mDrawerLayout.setDrawerListener(mDrawerToggle); if (savedInstanceState != null) { mCurrentDrawerPos = savedInstanceState.getInt(STATE_CURRENT_DRAWER_POS); } getLoaderManager().initLoader(LOADER_ID, null, this); if (PrefUtils.getBoolean(PrefUtils.REFRESH_ENABLED, true)) { // starts the service independent to this activity startService(new Intent(this, RefreshService.class)); } else { stopService(new Intent(this, RefreshService.class)); } if (PrefUtils.getBoolean(PrefUtils.REFRESH_ON_OPEN_ENABLED, false)) { if (!PrefUtils.getBoolean(PrefUtils.IS_REFRESHING, false)) { startService(new Intent(HomeActivity.this, FetcherService.class) .setAction(FetcherService.ACTION_REFRESH_FEEDS)); } } } private void refreshTitleAndIcon() { Cursor cursor = getContentResolver().query(FeedColumns.CONTENT_URI, new String[] { Constants.DB_COUNT }, FeedColumns._ID, null, null); cursor.moveToFirst(); N = cursor.getInt(0); cursor.close(); getActionBar().setTitle(mTitle); if (mCurrentDrawerPos == 0) { getActionBar().setTitle(R.string.all); } else if (mCurrentDrawerPos == N + 1) { getActionBar().setTitle(R.string.favorites); } else if (mCurrentDrawerPos == N + 2) { getActionBar().setTitle(android.R.string.search_go); } else { getActionBar().setTitle(mTitle); if (mIcon != null) { } } } @Override protected void onSaveInstanceState(Bundle outState) { outState.putInt(STATE_CURRENT_DRAWER_POS, mCurrentDrawerPos); super.onSaveInstanceState(outState); } @Override protected void onResume() { super.onResume(); PrefUtils.registerOnPrefChangeListener(mShowReadListener); } @Override protected void onPause() { PrefUtils.unregisterOnPrefChangeListener(mShowReadListener); super.onPause(); } @Override public void finish() { if (mCanQuit) { super.finish(); return; } Toast.makeText(this, R.string.back_again_to_quit, Toast.LENGTH_SHORT).show(); mCanQuit = true; new Handler().postDelayed(new Runnable() { @Override public void run() { mCanQuit = false; } }, 3000); } @Override public boolean onCreateOptionsMenu(Menu menu) { boolean isOpened = mDrawerLayout.isDrawerOpen(mDrawerList); if (isOpened && !mIsDrawerMoving || !isOpened && mIsDrawerMoving) { getActionBar().setIcon(R.drawable.drawer_icon); MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.drawer, menu); mEntriesFragment.setHasOptionsMenu(false); } else { refreshTitleAndIcon(); mEntriesFragment.setHasOptionsMenu(true); } return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } switch (item.getItemId()) { case R.id.menu_refresh_main: if (!PrefUtils.getBoolean(PrefUtils.IS_REFRESHING, false)) { MainApplication.getContext() .startService(new Intent(MainApplication.getContext(), FetcherService.class) .setAction(FetcherService.ACTION_REFRESH_FEEDS)); } return true; default: return super.onOptionsItemSelected(item); } } @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); // Sync the toggle state after onRestoreInstanceState has occurred. mDrawerToggle.syncState(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); mDrawerToggle.onConfigurationChanged(newConfig); } @Override public Loader<Cursor> onCreateLoader(int i, Bundle bundle) { CursorLoader cursorLoader = new CursorLoader(this, FeedColumns.GROUPED_FEEDS_CONTENT_URI, new String[] { FeedColumns._ID, FeedColumns.URL, FeedColumns.NAME, FeedColumns.IS_GROUP, FeedColumns.GROUP_ID, FeedColumns.ICON, FeedColumns.LAST_UPDATE, FeedColumns.ERROR, FEED_UNREAD_NUMBER }, PrefUtils.getBoolean(PrefUtils.SHOW_READ, true) ? "" : "", null, null); cursorLoader.setUpdateThrottle(Constants.UPDATE_THROTTLE_DELAY); return cursorLoader; } @Override public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) { if (mDrawerAdapter != null) { mDrawerAdapter.setCursor(cursor); } else { mDrawerAdapter = new DrawerAdapter(this, cursor); mDrawerList.setAdapter(mDrawerAdapter); // We don't have any menu yet, we need to display it mDrawerList.post(new Runnable() { @Override public void run() { selectDrawerItem(mCurrentDrawerPos); refreshTitleAndIcon(); } }); } } @Override public void onLoaderReset(Loader<Cursor> cursorLoader) { mDrawerAdapter.setCursor(null); } private void selectDrawerItem(int position) { mCurrentDrawerPos = position; mIcon = null; Uri newUri; boolean showFeedInfo = true; if (position == 0) { newUri = EntryColumns.ALL_ENTRIES_CONTENT_URI; } else if (position == N + 1) { newUri = EntryColumns.FAVORITES_CONTENT_URI; } else if (position == N + 2) { newUri = EntryColumns.SEARCH_URI(mEntriesFragment.getCurrentSearch()); } else if (position == N + 3) { startActivity(new Intent(this, GeneralPrefsActivity.class)); newUri = EntryColumns.ALL_ENTRIES_CONTENT_URI; position = 0; mCurrentDrawerPos = 0; } else { long feedOrGroupId = mDrawerAdapter.getItemId(position); if (mDrawerAdapter.isItemAGroup(position)) { newUri = EntryColumns.ENTRIES_FOR_GROUP_CONTENT_URI(feedOrGroupId); } else { byte[] iconBytes = mDrawerAdapter.getItemIcon(position); Bitmap bitmap = UiUtils.getScaledBitmap(iconBytes, 24); if (bitmap != null) { mIcon = new BitmapDrawable(getResources(), bitmap); } newUri = EntryColumns.ENTRIES_FOR_FEED_CONTENT_URI(feedOrGroupId); showFeedInfo = false; } mTitle = mDrawerAdapter.getItemName(position); } if (!newUri.equals(mEntriesFragment.getUri())) { mEntriesFragment.setData(newUri, showFeedInfo); } mDrawerList.setItemChecked(position, true); // First open => we open the drawer for you if (PrefUtils.getBoolean(PrefUtils.FIRST_OPEN, true)) { PrefUtils.putBoolean(PrefUtils.FIRST_OPEN, false); mDrawerLayout.postDelayed(new Runnable() { @Override public void run() { mDrawerLayout.openDrawer(mDrawerList); } }, 500); } } }