Curso de desarrollo Android para programadores que ya conozcan el lenguaje java y sepan mínimamente en que consiste la plataforma Androir

1. Desarrollo en Android

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4. Introducción a Android: un poco de historia (II) Primeros prototipos de Android:

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10. Arquitectura del sistema (II)

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26. Arquitectura de las aplicaciones: Activity Manager (II) Mensaje ANR:

29. Arquitectura de las aplicaciones: Resource Manager Estructura típica:

32. Arquitectura de las aplicaciones: Ciclo de vida de los componentes (Activity)

35. Ciclo de vida del Service (según creación)

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40. Primera aplicación: emulador Android (II) Imagen del emulador

43. Primera aplicación: DDMS (II)

44. Primera aplicación: DDMS (III)

48. Primera aplicación AndroidManifest.xml (II) <? xml version = &quot;1.0&quot; encoding = &quot;utf-8&quot; ?> < manifest xmlns:android = &quot;http://schemas.android.com/apk/res/android&quot; package = &quot;prueba.Android&quot; android:versionCode = &quot;1&quot; android:versionName = &quot;1.0&quot; > < application android:icon = &quot;@drawable/icon&quot; android:label = &quot;@string/app_name&quot; > < activity android:name = &quot;.HelloWord&quot; android:label = &quot;@string/app_name&quot; > < intent-filter > < action android:name = &quot;android.intent.action.MAIN&quot; /> < category android:name = &quot;android.intent.category.LAUNCHER&quot; /> </ intent-filter > </ activity > </ application > < uses-sdk android:minSdkVersion = &quot;7&quot; /> </ manifest >

49. Primera aplicación: Hello Android! package com.android.helloandroid; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class HelloAndroid extends Activity { /** Called when the activity is first created. */ public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView tv = new TextView(this); tv.setText(&quot;Hello, Android&quot;); setContentView(tv); } }

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54. Interfaces de usuario (III)

58. Interfaces de usuario: Creación de vista por código public void onCreate(Bundle icicle) { super.onCreate(icicle); TextView myTextView = new TextView(this); setContentView(myTextView); myTextView.setText(“Hello, Android”); }

62. Interfaces de usuario: Widgets toolbox (II) TextView EditText con un Button ListView Spinner

63. Interfaces de usuario: Widgets toolbox (III) DatePicker TimePicker AutoComplete

66. Interfaces de usuario: Layouts (III) LinearLayout RelativeLayout AbsoluteLayout

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77. Eventos: ejemplo de Intent Filter <? xml version = &quot;1.0&quot; encoding = &quot;utf-8&quot; ?> < manifest xmlns:android = &quot;http://schemas.android.com/apk/res/android&quot; package = &quot;prueba.Android&quot; android:versionCode = &quot;1&quot; android:versionName = &quot;1.0&quot; > < application android:icon = &quot;@drawable/icon&quot; android:label = &quot;@string/app_name&quot; > < activity android:name = &quot;.ApiDemos&quot; android:label = &quot;@string/app_name&quot; > < intent-filter > < action android:name = &quot;android.intent.action.MAIN&quot; /> < category android:name = &quot;android.intent.category.LAUNCHER&quot; /> </ intent-filter > </ activity > </ application > < uses-sdk android:minSdkVersion = &quot;7&quot; /> </ manifest >

80. Eventos: Broadcast Intents (III) Intent intent = new Intent(NEW_INTENT); intent.putExtra(“param1”, value1); intent.putExtra(“param2”, value2); intent.putExtra(“param3”, value3); sendBroadcast (intent);

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86. Notificaciones al usuario (III) Toast notification Status Bar Notification Dialog Notification

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90. Menus: Options Menu (II) /* Creates the menu items */ public boolean onCreateOptionsMenu(Menu menu ) { menu.add(0, MENU_NEW_GAME , 0, &quot;New Game&quot; ); menu.add(0, MENU_QUIT , 0, &quot;Quit&quot; ); return true ; } /* Handles item selections */ public boolean onOptionsItemSelected(MenuItem item ) { switch (item.getItemId()) { case MENU_NEW_GAME : newGame (); return true ; case MENU_QUIT : quit (); return true ; } return false ; }

91. Menus: Options Menu (III)

93. Menus: Context Menu (II) public void onCreateContextMenu(ContextMenu menu , View v , ContextMenuInfo menuInfo ) { super .onCreateContextMenu(menu, v, menuInfo); menu.add(0, EDIT_ID , 0, &quot;Edit&quot; ); menu.add(0, DELETE_ID , 0, &quot;Delete&quot; ); } public boolean onContextItemSelected(MenuItem item ) { AdapterContextMenuInfo info = ( AdapterContextMenuInfo ) item.getMenuInfo(); switch (item.getItemId()) { case EDIT_ID : editNote(info.id); return true ; case DELETE_ID : deleteNote(info.id); return true ; default : return super .onContextItemSelected(item); } }

94. Menus: Context Menu (III)

96. Menus: Submenus (II) public boolean onCreateOptionsMenu(Menu menu ) { boolean result = super .onCreateOptionsMenu(menu); SubMenu fileMenu = menu.addSubMenu( &quot;File&quot; ); SubMenu editMenu = menu.addSubMenu( &quot;Edit&quot; ); fileMenu.add( &quot;new&quot; ); fileMenu.add( &quot;open&quot; ); fileMenu.add( &quot;save&quot; ); editMenu.add( &quot;undo&quot; ); editMenu.add( &quot;redo&quot; ); return result; }

97. Menus: Submenus (III)

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102. Almacenamiento de datos: Preferences (II) import android.app.Activity; import android.content.SharedPreferences; public class Calc extends Activity { public static final String PREFS_NAME = &quot;MyPrefsFile&quot; ; . . . @ Override protected void onCreate(Bundle state) { super .onCreate(state); . . . // Restore preferences SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); boolean silent = settings.getBoolean( &quot;silentMode&quot; , false ); setSilent (silent); } @Override protected void onStop(){ super .onStop(); // Save user preferences. We need an Editor object to // make changes. All objects are from android.context.Context SharedPreferences settings = getSharedPreferences( PREFS_NAME , 0); SharedPreferences.Editor editor = settings.edit(); editor.putBoolean( &quot;silentMode&quot; , mSilentMode ); // Don't forget to commit your edits!!! editor.commit(); } }

108. Almacenamiento de datos: SQLite creación de tablas private static final String DATABASE_NAME = “myDatabase.db”; private static final String DATABASE_TABLE = “mainTable”; private static final String DATABASE_CREATE = “ create table “ + DATABASE_TABLE + “ ( _id integer primary key autoincrement,” + “column_one text not null );”; SQLiteDatabase myDatabase; private void createDatabase() { myDatabase = openOrCreateDatabase(DATABASE_NAME, Context.MODE_PRIVATE, null ); myDatabase.execSQL(DATABASE_CREATE); }

109. Almacenamiento de datos: SQLite querys // Return all rows for columns one and three, no duplicates String[] result_columns = new String[] {KEY_ID, KEY_COL1, KEY_COL3}; Cursor allRows = myDatabase.query( true , DATABASE_TABLE, result_columns, null , null , null , null , null , null ); // Return all columns for rows where column 3 equals a set value // and the rows are ordered by column 5. String where = KEY_COL3 + “=” + requiredValue; String order = KEY_COL5; Cursor myResult = myDatabase.query(DATABASE_TABLE, null , where, null , null , null , order);

110. Almacenamiento de datos: SQLite resultados int GOLD_HOARDED_COLUMN = 2; Cursor myGold = myDatabase.query(“GoldHoards”, null , null , null , null , null , null ); float totalHoard = 0f; // Make sure there is at least one row. if (myGold.moveToFirst()) { // Iterate over each cursor. do { float hoard = myGold.getFloat(GOLD_HOARDED_COLUMN); totalHoard += hoard; } while (myGold.moveToNext()); } float averageHoard = totalHoard / myGold.getCount();

111. Almacenamiento de datos: SQLite Añadir un nuevo registro // Create a new row of values to insert. ContentValues newValues = new ContentValues(); // Assign values for each row. newValues.put(COLUMN_NAME, newValue); [ ... Repeat for each column ... ] // Insert the row into your table myDatabase.insert(DATABASE_TABLE, null , newValues);

112. Almacenamiento de datos: SQLite Modificar un registro // Define the updated row content. ContentValues updatedValues = new ContentValues(); // Assign values for each row. updatedValues.put(COLUMN_NAME, newValue); [ ... Repeat for each column ... ] String where = KEY_ID + “=” + rowId; // Update the row with the specified index with the new values. myDatabase.update(DATABASE_TABLE, updatedValues, where, null );

113. Almacenamiento de datos: SQLite borrado de registro myDatabase.delete(DATABASE_TABLE, KEY_ID + “=” + rowId, null );

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116. Content Providers: consultas Para recuperar todos los registros: Cursor allRows = getContentResolver().query(MyProvider.CONTENT_URI, null, null, null, null); Para consultar todos los registros tales que la columna KEY_COL3 tiene un determinado valor, y ordenada por la columna KEY_COL5: String where = KEY_COL3 + “=” + requiredValue; String order = KEY_COL5; Cursor someRows = getContentResolver().query(MyProvider.CONTENT_URI, null, where, null,order);

117. Content Providers: modificaciones Insert: newValues.put(COLUMN_NAME, newValue); Uri myRowUri = getContentResolver().insert(MyProvider.CONTENT_URI, newValues); Delete: getContentResolver().delete(myRowUri, null, null); Update: getContentResolver().update(MyProvider.CONTENT_URI, newValues, where, null);

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121. Services: creación de servicios Ejemplo de creación de un servicio: import android.app.Service; import android.content.Intent; import android.os.IBinder; public class MyService extends Service { @Override public void onCreate() { // TODO: Actions to perform when service is created. } @Override public IBinder onBind(Intent intent) { // TODO: Replace with service binding implementation. return null; } And update the manifest file with : <service android:enabled=”true” android:name=”.MyService”></service>

122. Services: control de los servicios Para iniciar un servicio: startService(new Intent(MyService.MY_ACTION)); Para parar un servicio iniciado: ComponentName service = startService(new Intent(this, BaseballWatch.class)); // Stop a service using the service name. stopService(new Intent(this, service.getClass()));

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