Android™ Application Development - Bahar Ali Khan

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Chapter 6: Data Storage, Retrieval, and Sharing Creating the Content Provider 198 The following example shows how to create an Earthquake Content Provider. Each quake will be stored in an SQLite database. 1. Open the Earthquake project, and create a new EarthquakeProvider class that extends ContentProvider. Include stubs to override the onCreate, getType, query, insert, delete, and update methods. package com.paad.earthquake; import android.content.*; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteOpenHelper; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteQueryBuilder; import android.net.Uri; import android.text.TextUtils; import android.util.Log; public class EarthquakeProvider extends ContentProvider { } @Override public boolean onCreate() { } @Override public String getType(Uri url) { } @Override public Cursor query(Uri url, String[] projection, String selection, String[] selectionArgs, String sort) { } @Override public Uri insert(Uri _url, ContentValues _initialValues) { } @Override public int delete(Uri url, String where, String[] whereArgs) { } @Override public int update(Uri url, ContentValues values, String where, String[] wArgs) { } 2. Expose a content URI for this provider. This URI will be used to access the Content Provider from within application components using a ContentResolver. public static final Uri CONTENT_URI = Uri.parse(“content://com.paad.provider.earthquake/earthquakes”);
Chapter 6: Data Storage, Retrieval, and Sharing 3. Create the database that will be used to store the earthquakes. Within the EathquakeProvider class, create a new SQLiteDatabase instance, and expose public variables that describe the column names and indexes. Include an extension of SQLiteOpenHelper to manage database creation and version control. // The underlying database private SQLiteDatabase earthquakeDB; private static final String TAG = “EarthquakeProvider”; private static final String DATABASE_NAME = “earthquakes.db”; private static final int DATABASE_VERSION = 1; private static final String EARTHQUAKE_TABLE = “earthquakes”; // Column Names public static final String KEY_ID = “_id”; public static final String KEY_DATE = “date”; public static final String KEY_DETAILS = “details”; public static final String KEY_LOCATION_LAT = “latitude”; public static final String KEY_LOCATION_LNG = “longitude”; public static final String KEY_MAGNITUDE = “magnitude”; public static final String KEY_LINK = “link”; // Column indexes public static final int DATE_COLUMN = 1; public static final int DETAILS_COLUMN = 2; public static final int LONGITUDE_COLUMN = 3; public static final int LATITUDE_COLUMN = 4; public static final int MAGNITUDE_COLUMN = 5; public static final int LINK_COLUMN = 6; // Helper class for opening, creating, and managing // database version control private static class earthquakeDatabaseHelper extends SQLiteOpenHelper { private static final String DATABASE_CREATE = “create table “ + EARTHQUAKE_TABLE + “ (“ + KEY_ID + “ integer primary key autoincrement, “ + KEY_DATE + “ INTEGER, “ + KEY_DETAILS + “ TEXT, “ + KEY_LOCATION_LAT + “ FLOAT, “ + KEY_LOCATION_LNG + “ FLOAT, “ + KEY_MAGNITUDE + “ FLOAT, “ + KEY_LINK + “ TEXT);”; public earthquakeDatabaseHelper(Context context, String name, CursorFactory factory, int version) { super(context, name, factory, version); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL(DATABASE_CREATE); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, 199
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Professional Android Application su
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Professional Android Application D
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Professional Android Application D
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About the Author Originally from Pe
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Acknowledgments A big thank you goe
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Contents Chapter 2: Getting Started
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Contents xii Saving and Loading Fil
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Contents Chapter 10: Accessing Andr
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Introduction Now is an exciting tim
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Introduction covered, you can move
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Introduction At http://p2p.wrox.com
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Chapter 1: Hello, Android 2 Using t
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Chapter 1: Hello, Android An Open P
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Chapter 1: Hello, Android 6 ❑ ❑
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Chapter 1: Hello, Android 8 When ma
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Chapter 1: Hello, Android 10 In mar
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Chapter 1: Hello, Android 12 Each A
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Chapter 1: Hello, Android 14 ❑ Da
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Chapter 1: Hello, Android 16 ❑ an
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Getting Started All you need to sta
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Chapter 2: Getting Started Unless o
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Installing the ADT Plug-in Install
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Chapter 2: Getting Started 3. In th
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Chapter 2: Getting Started If every
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} lp = new LinearLayout.LayoutParam
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❑ ❑ ❑ ❑ ❑ Small screens w
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Chapter 2: Getting Started on how t
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Chapter 2: Getting Started To start
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Ensuring a Seamless User Experience
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Figure 2-11 Chapter 2: Getting Star
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} myListView.setAdapter(aa); Chapte
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Chapter 2: Getting Started A number
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Creating Applications and Activitie
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Chapter 3: Creating Applications an
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Creating Resources Chapter 3: Creat
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❑ ❑ #ARGB #ARRGGBB Chapter 3: C
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android:startOffset=”500” andro
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Referencing Resources in Resources
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} } Chapter 3: Creating Application
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Chapter 4: Creating User Interfaces
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Chapter 8: Working in the Backgroun
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Peer-to-Peer Communication In this
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Chapter 9: Peer-to-Peer Communicati
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} Chapter 9: Peer-to-Peer Communica
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Handling Subscription Requests Chap
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Figure 9-4 Chapter 9: Peer-to-Peer
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Accessing Android Hardware Android
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Chapter 10: Accessing Android Hardw
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content.put(Audio.AudioColumns.DATE
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public void onShutter() { // TODO D
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Chapter 11: Advanced Android Develo
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400 Android, getting started Androi
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402 databases databases creating ea
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404 interapplication communication
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406 passing custom class objects pa
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408 synchronizing threads synchroni
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Programmer to Programmer Get more
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Android™ Application Development - Bahar Ali Khan

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