Android101 : Introduksjon til Android

Android 101Introduksjon til Android Truls Jørgensenog Are Wold 8. september 2010

Bakgrunn Android kjøpesoppav Google i 2005 Googlesmotivasjon "Bedretjenesterogbrukeropplevelsepåmobilgirmermobilnettbrukogmerpengerireklamekassatil Google" (Computerworld UK) "Merinnovasjonpå mobile plattformer", "The world was broken"- Rich Miner, Google Sidekick T-Mobile G1 / HTC Dream Nexus One © 2010 Capgemini. All rights reserved.

Android! "The first truly open and comprehensive platform for mobile devices, all of the software to run a mobile phone but without the proprietary obstacles that have hindered mobile innovation" - Andy Rubin, Google © 2010 Capgemini. All rights reserved.

Utviklingsverktøy og dokumentasjon Tilgjengeligeutviklingsplattformer Eclipse, SDK Emulator, ADB, SQLite Debugging på device Dalvik debug monitor - tilstandpåenheten LogCat Online API reference, Java style http://developer.android.com © 2010 Capgemini. All rights reserved.

..and now for somethingcompletelydifferent!

Fra XML til Java © 2010 Capgemini. All rights reserved. // res/layout/movie_list.xml <Button android:id="@+id/select_city_button“ android:textSize="20dp” /> // R.java public static final class id { (…) public static final intselect_city_button=0x7f070016; } // MovieListActivity.java mCinemaButton = (Button) findViewById(R.id.select_city_button);

MovieList.xml <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#FFFFFF" (…) <Button android:id="@+id/movie_list_cinema" android:textSize="20dp" android:background="@drawable/select_city_button" android:text=“@string/select_city_text“ /> </LinearLayout> Insert "Title, Author, Date" © 2010 Capgemini. All rights reserved. res/values/string.xml: (…) <stringname=”select_city_text">Velgby</string>

Activity – MovieListActivity.java publicclassMovieListActivityextendsListActivity { (…) /** Called when the activity is first created. */ @Override publicvoidonCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.movie_list); mMovieListHeader = (TextView) findViewById(R.id.movie_list_header); currentCity = getSelectedCity(); mMovieListHeader.setText( getString(R.string.header_text_now_showing_in) + currentCity); updateMoviesForCity(currentCity); (…) } } Insert "Title, Author, Date" © 2010 Capgemini. All rights reserved.

Kommunikasjonmellomkomponenter ,[object Object]

Starte en Activity – spesifisert, eller ikke

Intents mellom activites © 2010 Capgemini. All rights reserved. // MovieListActivity.java final Intent intent = new Intent(this, MovieDetails.class); intent.putExtra(MoviesProvider._ID, id); startActivity(intent); // MovieDetailsActivity.java finalIntentintent = getIntent(); long id = intent.getExtras().getLong(MoviesProvider._ID); Insert "Title, Author, Date"

Intents mellom applikasjoner © 2010 Capgemini. All rights reserved. // MovieDetailsActivity.java final Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse(buyTicketLink)); startActivity(intent); // MovieDetailsActivity.java final Intent intent= new Intent(Intent.ACTION_VIEW); intent.setDataAndType( Uri.parse(mMovieDetailsTrailerUrl),"video/*"); startActivity(intent);

Content Provider Wrapper rundt en datakilde For data somønskestilbudttilandreapplikasjoner (egentlig) Standardiserttilgangtil data vha CONTENT_URI: content://no.jzinema.provider.Movies/movies © 2010 Capgemini. All rights reserved.

Content Provider: Persistering © 2010 Capgemini. All rights reserved. Content Provider Sqlite DB // Lagre en film // CONTENT_URI: content://no.jzinema.provider.Movies/movies Uriuri = mContext.getContentResolver(). insert(MoviesProvider.CONTENT_URI, values);

Content Provider: Henting av data © 2010 Capgemini. All rights reserved. Content Provider Sqlite DB // MovieDetailsActiviy.java henter en film: //content://no.jzinema.provider.Movies/movies/5 Cursor c = managedQuery(ContentUris.withAppendedId( MoviesProvider.CONTENT_URI, _id), null, null, null, null); // MovieListActivity.java spør // (blant annet) etter alle filmers id Cursor c = managedQuery(MoviesProvider.CONTENT_URI, COLUMN_ID, null, null, null);

MoviesContentProvider.java publicclassMoviesProviderextendsContentProvider { publicstaticfinal String AUTHORITY = "no.jzinema.provider.Movies"; publicstaticfinal Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/movies"); @Override publicbooleanonCreate(…) @Override public Uri insert(…) @Override public Cursor query(…) @Override publicint update(…) @Override publicint delete(…) @Override public String getType(…) } Insert "Title, Author, Date" © 2010 Capgemini. All rights reserved.

MovieListActivity: Cursor og CursorAdapter © 2010 Capgemini. All rights reserved. // Alle filmer i en by Cursor cursor = getContentResolver().query( MoviesProvider.CONTENT_URI, COLUMNS, MovieConstants.ATTRIBUTE_ID + " IN (" + movieIds + ")", null, null); startManagingCursor(cursor); // Opprett et cursorAdaptersombenyttercursorentil å populerehverradi listen mAdapter = newMovieListCursorAdapter (this, R.layout.movie_list_row, cursor, COLUMNS, VIEWS_IN_LIST_ROW); // ListActivitytrenger et adapter. this.setListAdapter(mAdapter); Content Provider Sqlite DB

Konfigurering AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="no.capgemini.jzinema” android:versionCode="1” android:versionName="1.0">  <uses-permission android:name="android.permission.INTERNET" /> <application android:icon="@drawable/icon" android:label="@string/app_name" android:debuggable="true">  <activity android:name=".MovieList“> <intent-filter> <category android:name="android.intent.category.LAUNCHER" /> <action android:name="no.capgemini.jzinema.SHOW_MOVIELIST" /> </intent-filter> </activity> <providerandroid:authorities="no.jzinema.provider.Movies“ android:name=".provider.MoviesProvider“ /> </application> <uses-sdkandroid:minSdkVersion=“4" /> </manifest> © 2010 Capgemini. All rights reserved.

AndroidManifest.xml - utdrag <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="no.capgemini.jzinema” android:versionCode="1” android:versionName="1.0">  <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <application android:icon="@drawable/icon" android:label="@string/app_name">  <activity android:name=".activity.movielist.MovieListActivity" android:label="@string/app_name" android:configChanges="orientation"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <providerandroid:authorities="no.jzinema.provider.Movies“ android:name=".provider.MoviesProvider“ /> </application> <uses-sdkandroid:minSdkVersion=“4" /> </manifest> Insert "Title, Author, Date" © 2010 Capgemini. All rights reserved.

Aktivitet starter Forenkletlivssyklus for en Activity onCreate() Bruker går tilbake til aktiviteten onStart() onRestart() onResume() Prosess drept Aktivitet kjører Aktivitet havner i forgrunnen Aktivitet havner i bakgrunnen Aktivitet havner i forgrunnen onSaveInstanceState() onPause() Lavt minne Aktiviteten er usynlig onStop() Aktivitet avsluttet Lavt minne, finish() onDestroy() © 2010 Capgemini. All rights reserved.

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