Java tutorial
/* * Twidere - Twitter client for Android * * Copyright (C) 2012 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.activity; import java.util.List; import org.mariotaku.twidere.Constants; import org.mariotaku.twidere.R; import org.mariotaku.twidere.adapter.AccountsAdapter; import org.mariotaku.twidere.provider.TweetStore.Accounts; import org.mariotaku.twidere.util.ArrayUtils; import org.mariotaku.twidere.util.NoDuplicatesArrayList; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.database.Cursor; import android.os.Bundle; import android.os.Handler; import android.os.SystemClock; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.util.SparseBooleanArray; import android.view.View; import android.view.View.OnClickListener; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListView; import android.widget.Toast; public class SelectAccountActivity extends BaseDialogActivity implements LoaderCallbacks<Cursor>, OnItemClickListener, OnClickListener, OnScrollListener { private static final long TICKER_DURATION = 5000L; private ListView mListView; private AccountsAdapter mAdapter; private final List<Long> mSelectedIds = new NoDuplicatesArrayList<Long>(); private Handler mHandler; private Runnable mTicker; private volatile boolean mBusy, mTickerStopped; private SharedPreferences mPreferences; private boolean mAllowSelectNone, mOAuthOnly; private final BroadcastReceiver mStateReceiver = new BroadcastReceiver() { @Override public void onReceive(final Context context, final Intent intent) { final String action = intent.getAction(); if (BROADCAST_ACCOUNT_LIST_DATABASE_UPDATED.equals(action)) { if (!isFinishing()) { getSupportLoaderManager().restartLoader(0, null, SelectAccountActivity.this); } } } }; @Override public void onBackPressed() { if (mSelectedIds.size() <= 0 && !mAllowSelectNone) { Toast.makeText(this, R.string.no_account_selected, Toast.LENGTH_SHORT).show(); return; } final Bundle bundle = new Bundle(); final long[] ids = new long[mSelectedIds.size()]; int i = 0; for (final Long id_long : mSelectedIds) { ids[i] = id_long; i++; } bundle.putLongArray(INTENT_KEY_IDS, ids); setResult(RESULT_OK, new Intent().putExtras(bundle)); finish(); } @Override public void onClick(final View view) { switch (view.getId()) { case R.id.save: { onBackPressed(); break; } } } @Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); mPreferences = getSharedPreferences(SHARED_PREFERENCES_NAME, MODE_PRIVATE); final Bundle extras = getIntent().getExtras(); setContentView(R.layout.select_account); mListView = (ListView) findViewById(android.R.id.list); mAdapter = new AccountsAdapter(this, true); mListView.setAdapter(mAdapter); mListView.setOnItemClickListener(this); mListView.setOnScrollListener(this); final long[] activated_ids; if (savedInstanceState != null) { activated_ids = savedInstanceState.getLongArray(INTENT_KEY_IDS); } else if (extras != null) { activated_ids = extras.getLongArray(INTENT_KEY_IDS); } else { activated_ids = null; } mAllowSelectNone = extras != null ? extras.getBoolean(INTENT_KEY_ALLOW_SELECT_NONE, false) : false; mOAuthOnly = extras != null ? extras.getBoolean(INTENT_KEY_OAUTH_ONLY, false) : false; mSelectedIds.clear(); if (activated_ids != null) { for (final long id : activated_ids) { mSelectedIds.add(id); } } getSupportLoaderManager().initLoader(0, null, this); } @Override public Loader<Cursor> onCreateLoader(final int id, final Bundle args) { final String where = mOAuthOnly ? Accounts.AUTH_TYPE + " = " + Accounts.AUTH_TYPE_OAUTH : null; return new CursorLoader(this, Accounts.CONTENT_URI, Accounts.COLUMNS, where, null, null); } @Override public void onItemClick(final AdapterView<?> adapter, final View view, final int position, final long id) { final boolean checked = mAdapter.isChecked(position); mAdapter.setItemChecked(position, !checked); final long user_id = mAdapter.getAccountIdAt(position); if (checked) { mSelectedIds.remove(user_id); } else { mSelectedIds.add(user_id); } } @Override public void onLoaderReset(final Loader<Cursor> loader) { mAdapter.swapCursor(null); } @Override public void onLoadFinished(final Loader<Cursor> loader, final Cursor cursor) { mAdapter.swapCursor(cursor); final SparseBooleanArray checked = new SparseBooleanArray(); cursor.moveToFirst(); if (mSelectedIds.size() == 0) { if (mAllowSelectNone) return; while (!cursor.isAfterLast()) { final boolean is_activated = cursor .getInt(cursor.getColumnIndexOrThrow(Accounts.IS_ACTIVATED)) == 1; final long user_id = cursor.getLong(cursor.getColumnIndexOrThrow(Accounts.ACCOUNT_ID)); if (is_activated) { mSelectedIds.add(user_id); } mAdapter.setItemChecked(cursor.getPosition(), is_activated); cursor.moveToNext(); } } else { while (!cursor.isAfterLast()) { final long user_id = cursor.getLong(cursor.getColumnIndexOrThrow(Accounts.ACCOUNT_ID)); if (mSelectedIds.contains(user_id)) { checked.put(cursor.getPosition(), true); mAdapter.setItemChecked(cursor.getPosition(), true); } cursor.moveToNext(); } } } @Override public void onResume() { super.onResume(); final boolean display_profile_image = mPreferences.getBoolean(PREFERENCE_KEY_DISPLAY_PROFILE_IMAGE, true); mAdapter.setDisplayProfileImage(display_profile_image); } @Override public void onSaveInstanceState(final Bundle outState) { outState.putLongArray(Constants.INTENT_KEY_IDS, ArrayUtils.fromList(mSelectedIds)); super.onSaveInstanceState(outState); } @Override public void onScroll(final AbsListView view, final int firstVisibleItem, final int visibleItemCount, final int totalItemCount) { } @Override public void onScrollStateChanged(final AbsListView view, final int scrollState) { switch (scrollState) { case SCROLL_STATE_FLING: case SCROLL_STATE_TOUCH_SCROLL: mBusy = true; break; case SCROLL_STATE_IDLE: mBusy = false; break; } } @Override public void onStart() { super.onStart(); mTickerStopped = false; mHandler = new Handler(); mTicker = new Runnable() { @Override public void run() { if (mTickerStopped) return; if (mListView != null && !mBusy) { mAdapter.notifyDataSetChanged(); } final long now = SystemClock.uptimeMillis(); final long next = now + TICKER_DURATION - now % TICKER_DURATION; mHandler.postAtTime(mTicker, next); } }; mTicker.run(); final IntentFilter filter = new IntentFilter(BROADCAST_ACCOUNT_LIST_DATABASE_UPDATED); registerReceiver(mStateReceiver, filter); } @Override public void onStop() { mTickerStopped = true; unregisterReceiver(mStateReceiver); super.onStop(); } }