hmkcode
12 years ago
parent
ef85815469
commit
0724d1ae3b
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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.hmkcode.android"
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android:versionCode="1"
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android:versionName="1.0" >
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<uses-sdk
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android:minSdkVersion="8"
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android:targetSdkVersion="17" />
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<application
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android:allowBackup="true"
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android:icon="@drawable/ic_launcher"
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android:label="@string/app_name"
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android:theme="@style/AppTheme" >
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<activity
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android:name="com.hmkcode.android.MainActivity"
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android:label="@string/app_name" >
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>
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After Width: | Height: | Size: 7.5 KiB |
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:paddingBottom="@dimen/activity_vertical_margin"
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android:paddingLeft="@dimen/activity_horizontal_margin"
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android:paddingRight="@dimen/activity_horizontal_margin"
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android:paddingTop="@dimen/activity_vertical_margin"
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tools:context=".MainActivity" >
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<TextView
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="@string/hello_world" />
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</RelativeLayout>
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<menu xmlns:android="http://schemas.android.com/apk/res/android" >
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<item
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android:id="@+id/action_settings"
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android:orderInCategory="100"
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android:showAsAction="never"
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android:title="@string/action_settings"/>
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</menu>
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<resources>
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<!-- Default screen margins, per the Android Design guidelines. -->
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<dimen name="activity_horizontal_margin">16dp</dimen>
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<dimen name="activity_vertical_margin">16dp</dimen>
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</resources>
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<?xml version="1.0" encoding="utf-8"?>
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<resources>
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<string name="app_name">SQLite</string>
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<string name="action_settings">Settings</string>
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<string name="hello_world">Hello world!</string>
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</resources>
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<resources>
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<!--
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Base application theme, dependent on API level. This theme is replaced
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by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
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-->
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<style name="AppBaseTheme" parent="android:Theme.Light">
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<!--
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Theme customizations available in newer API levels can go in
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res/values-vXX/styles.xml, while customizations related to
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backward-compatibility can go here.
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-->
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</style>
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<!-- Application theme. -->
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<style name="AppTheme" parent="AppBaseTheme">
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<!-- All customizations that are NOT specific to a particular API-level can go here. -->
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</style>
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</resources>
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package com.hmkcode.android;
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import java.util.List;
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import com.hmkcode.android.model.Book;
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import com.hmkcode.android.sqlite.MySQLiteHelper;
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import android.os.Bundle;
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import android.app.Activity;
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public class MainActivity extends Activity {
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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MySQLiteHelper db = new MySQLiteHelper(this);
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/**
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* CRUD Operations
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* */
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// add Books
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db.addBook(new Book("Android Application Development Cookbook", "Wei Meng Lee"));
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db.addBook(new Book("Android Programming: The Big Nerd Ranch Guide", "Bill Phillips and Brian Hardy"));
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db.addBook(new Book("Learn Android App Development", "Wallace Jackson"));
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// get all books
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List<Book> list = db.getAllBooks();
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// delete one book
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db.deleteBook(list.get(0));
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// get all books
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db.getAllBooks();
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}
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}
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package com.hmkcode.android.model;
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public class Book {
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private int id;
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private String title;
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private String author;
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public Book(){}
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public Book(String title, String author) {
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super();
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this.title = title;
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this.author = author;
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}
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public String getTitle() {
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return title;
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}
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public void setTitle(String title) {
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this.title = title;
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}
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public String getAuthor() {
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return author;
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}
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public void setAuthor(String author) {
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this.author = author;
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}
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@Override
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public String toString() {
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return "Book [id=" + id + ", title=" + title + ", author=" + author
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+ "]";
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}
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}
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package com.hmkcode.android.sqlite;
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import java.util.LinkedList;
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import java.util.List;
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import com.hmkcode.android.model.Book;
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import android.content.ContentValues;
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import android.content.Context;
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import android.database.Cursor;
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import android.database.sqlite.SQLiteDatabase;
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import android.database.sqlite.SQLiteOpenHelper;
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import android.util.Log;
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public class MySQLiteHelper extends SQLiteOpenHelper {
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// Database Version
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private static final int DATABASE_VERSION = 1;
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// Database Name
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private static final String DATABASE_NAME = "BookDB";
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public MySQLiteHelper(Context context) {
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super(context, DATABASE_NAME, null, DATABASE_VERSION);
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}
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@Override
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public void onCreate(SQLiteDatabase db) {
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// SQL statement to create book table
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String CREATE_BOOK_TABLE = "CREATE TABLE books ( " +
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"id INTEGER PRIMARY KEY AUTOINCREMENT, " +
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"title TEXT, "+
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"author TEXT )";
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// create books table
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db.execSQL(CREATE_BOOK_TABLE);
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}
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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// Drop older books table if existed
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db.execSQL("DROP TABLE IF EXISTS books");
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// create fresh books table
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this.onCreate(db);
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}
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//---------------------------------------------------------------------
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/**
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* CRUD operations (create "add", read "get", update, delete) book + get all books + delete all books
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*/
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// Books table name
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private static final String TABLE_BOOKS = "books";
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// Books Table Columns names
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private static final String KEY_ID = "id";
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private static final String KEY_TITLE = "title";
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private static final String KEY_AUTHOR = "author";
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private static final String[] COLUMNS = {KEY_ID,KEY_TITLE,KEY_AUTHOR};
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public void addBook(Book book){
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Log.d("addBook", book.toString());
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// 1. get reference to writable DB
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SQLiteDatabase db = this.getWritableDatabase();
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// 2. create ContentValues to add key "column"/value
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ContentValues values = new ContentValues();
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values.put(KEY_TITLE, book.getTitle()); // get title
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values.put(KEY_AUTHOR, book.getAuthor()); // get author
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// 3. insert
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db.insert(TABLE_BOOKS, // table
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null, //nullColumnHack
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values); // key/value -> keys = column names/ values = column values
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// 4. close
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db.close();
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}
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public Book getBook(int id){
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// 1. get reference to readable DB
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SQLiteDatabase db = this.getReadableDatabase();
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// 2. build query
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Cursor cursor =
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db.query(TABLE_BOOKS, // a. table
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COLUMNS, // b. column names
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" id = ?", // c. selections
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new String[] { String.valueOf(id) }, // d. selections args
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null, // e. group by
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null, // f. having
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null, // g. order by
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null); // h. limit
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// 3. if we got results get the first one
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if (cursor != null)
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cursor.moveToFirst();
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// 4. build book object
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Book book = new Book();
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book.setId(Integer.parseInt(cursor.getString(0)));
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book.setTitle(cursor.getString(1));
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book.setAuthor(cursor.getString(2));
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Log.d("getBook("+id+")", book.toString());
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// 5. return book
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return book;
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}
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// Get All Books
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public List<Book> getAllBooks() {
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List<Book> books = new LinkedList<Book>();
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// 1. build the query
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String query = "SELECT * FROM " + TABLE_BOOKS;
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// 2. get reference to writable DB
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SQLiteDatabase db = this.getWritableDatabase();
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Cursor cursor = db.rawQuery(query, null);
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// 3. go over each row, build book and add it to list
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Book book = null;
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if (cursor.moveToFirst()) {
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do {
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book = new Book();
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book.setId(Integer.parseInt(cursor.getString(0)));
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book.setTitle(cursor.getString(1));
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book.setAuthor(cursor.getString(2));
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// Add book to books
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books.add(book);
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} while (cursor.moveToNext());
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}
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Log.d("getAllBooks()", books.toString());
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// return books
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return books;
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}
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// Updating single book
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public int updateBook(Book book) {
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// 1. get reference to writable DB
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SQLiteDatabase db = this.getWritableDatabase();
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// 2. create ContentValues to add key "column"/value
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ContentValues values = new ContentValues();
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values.put("title", book.getTitle()); // get title
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values.put("author", book.getAuthor()); // get author
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// 3. updating row
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int i = db.update(TABLE_BOOKS, //table
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values, // column/value
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KEY_ID+" = ?", // selections
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new String[] { String.valueOf(book.getId()) }); //selection args
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// 4. close
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db.close();
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return i;
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}
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// Deleting single book
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public void deleteBook(Book book) {
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// 1. get reference to writable DB
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SQLiteDatabase db = this.getWritableDatabase();
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// 2. delete
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db.delete(TABLE_BOOKS,
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KEY_ID+" = ?",
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new String[] { String.valueOf(book.getId()) });
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// 3. close
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db.close();
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Log.d("deleteBook", book.toString());
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}
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}
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