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Using ACTION_GET_CONTENT, you can pick a note from a collection of notes supported by the Notepad application using the following code: public static void invokeGetContent(Activity activity) { Intent pickIntent = new Intent(Intent.ACTION_GET_CONTENT); int requestCode = 2; pickIntent.setType("vnd.android.cursor.item/vnd.google.note"); activity.startActivityForResult(pickIntent, requestCode); } Notice how the intent type is set to the MIME type of a single note. Contrast this with the ACTION_PICK code in the following snippet, where the input is a data URI: public static void invokePick(Activity activity) { Intent pickIntent = new Intent(Intent.ACTION_PICK); int requestCode = 1; pickIntent.setData(Uri.parse( "content://com.google.provider.NotePad/notes")); activity.startActivityForResult(pickIntent, requestCode); } For an activity to respond to ACTION_GET_CONTENT, the activity has to register an intentfilter indicating that the activity can provide an item of that MIME type. Here is how the SDK s Notepad application accomplishes this: <activity android:name="NotesList" android:label="@string/title_notes_list"> <intent-filter> <action android:name="android.intent.action.GET_CONTENT" /> <category android:name="android.intent.category.DEFAULT" /> <data android:mimeType="vnd.android.cursor.item/vnd.google.note" /> </intent-filter> .. </activity> The rest of the code for responding to onActivityResult() is identical to the previous ACTION_PICK example. If there are multiple activities that can return the same MIME type, Android will show you the chooser dialog to let you pick an activity. The default chooser might not allow you to pick a different title, however. To address this restriction, Android provides the createChooser method on the Intent class that lets you use a specialized chooser whose title can be changed. Here is an example of how to invoke such a chooser: //start with your target Intent type you want to pick Intent intent = new Intent(); intent.setType( ); Intent chooserIntent = Intent.createChooser(intent, "Hello use this title"); activity.startActivityForResult(chooserIntent);

The only official distribution of OCaml comes from the Institut National de Recherche en Informatique et en Automatique (INRIA). All the source code and documentation contained within the official release can be found at http://caml.inria.fr (this source should be considered authoritative).

Listing 2 4. The NotePadProvider Class public class NotePadProvider extends ContentProvider { @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,String sortOrder) {} @Override public Uri insert(Uri uri, ContentValues initialValues) {} @Override public int update(Uri uri, ContentValues values, String where, String[] whereArgs) {} @Override public int delete(Uri uri, String where, String[] whereArgs) {} @Override public String getType(Uri uri) {} @Override

public boolean onCreate() {} private static class DatabaseHelper extends SQLiteOpenHelper {} @Override public void onCreate(SQLiteDatabase db) {} @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { //... } } }

Summary

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The NotePadProvider class extends the ContentProvider class. The ContentProvider class defines six abstract methods, four of which are CRUD (Create, Read, Update, Delete) operations. The other two abstract methods are onCreate() and getType(). onCreate() is called when the content provider is created for the first time. getType() provides the MIME type for the result set (you ll see how MIME types work when you read 3). The other interesting thing about the NotePadProvider class is the internal DatabaseHelper class, which extends the SQLiteOpenHelper class. Together, the two classes take care of initializing the Notepad database, opening and closing it, and performing other database tasks. Interestingly, the DatabaseHelper class is just a few lines of custom code (see Listing 2 5), while the Android implementation of SQLiteOpenHelper does most of the heavy lifting.

Official binaries exist for Microsoft Windows (for both the MinGW and Microsoft compiler tool chains), Linux, and Mac OS X. The full source code is also available and should build on any Portable Operating System Interface (POSIX) compliant operating system. Many Linux distributions have up-to-date packages for OCaml, and there are ports in the BSDs for OCaml and many associated libraries.

Listing 2 5. The DatabaseHelper Class private static class DatabaseHelper extends SQLiteOpenHelper { DatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL("CREATE TABLE " + NOTES_TABLE_NAME + " (" + Notes._ID + " INTEGER PRIMARY KEY," + Notes.TITLE + " TEXT," + Notes.NOTE + " TEXT," + Notes.CREATED_DATE + " INTEGER," + Notes.MODIFIED_DATE + " INTEGER" + ");"); } // }

In this chapter we covered the Android SDK s three key concepts: resources, content providers, and intents. In the section on resources, you learned how to create resources in XML files and use their resource IDs in programming. In the section about content providers, you learned how to work with URIs and MIME types, along with how to encapsulate data access in a content provider. You also learned the basics of creating and using a SQLite database, which should work well even if you use it without a content-provider abstraction. The third section showed you how to use intents to start other activities in a number of ways. Now you know how intents pave the way for plug-and-play and accomplish reuse at the UI level. With a good grasp of these three concepts, you should find it much easier to understand the Android SDK and Android UI programming in general.

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