Introduction To Google Android (Ft Rohan Bomle)

1. Google AndroidFafadia TechRohanBomle([email protected])

2. AndroidWhat is Android?A software platform and operating system for mobile devices

3. Based on the Linux kernel

4. Developed by Google and later the Open Handset Alliance (OHA)

5. Allows writing managed code in the Java language

6. C/C++ also possible but not supportedIDE and ToolsAndroid SDKClass Library

7. Developer Tools

8. dx – Dalvik Cross-Assembler

9. aapt – Android Asset Packaging Tool

10. adb – Android Debug Bridge

11. ddms – Dalvik Debug Monitor Service

12. Emulator and System Images

13. Documentation and Sample CodeEclipse IDE + ADT (Android Development Tools)Reduces Development and Testing Time

14. Makes User Interface-Creation easier

15. Makes Application Description EasierHow to install ADT in EclipseStart Eclipse, then select Help > Software Updates > Find and Install.... In the resulting dialog box, enter a name for the remote site (e.g. Android Plugin) and enter this as its URL: https://dl-ssl.google.com/android/eclipse/. Press OK.You should now see the new site added to the search list (and checked). Press Finish.In the subsequent Search Results dialog box, select the checkbox for Android Plugin > Eclipse Integration > Android Development Tools and press Next.Read the license agreement and then select Accept terms of the license agreement, if appropriate. Press Next. Press Finish.The ADT plugin is not signed; you can accept the installation anyway by pressing Install All. Restart Eclipse.

16. Android applications have common structureActivity is the presentation layer of your app: there will be one per screen, and the Views provide the UI to the activityIntents specify what specific action should be performedServices run in the background and have no UI for the user – they will update data, and trigger events

17. There is a common file structure for applicationscodeAutogenerated resource listfilesimagesUI layoutsconstants

18. Standard components form building blocks for Android appsNotificationsHas life-cycleActivityscreenViewsApp to handle contentIntentsBackground appLike music playerServicemanifestContentProvidersOther applications

19. Simple Android Application (java program)package com.google.android.helloactivity;import android.app.Activity;import android.os.Bundle;public class HelloActivity extends Activity { public HelloActivity() { } @Override public void onCreate(Bundle icicle) {super.onCreate(icicle);setContentView(R.layout.hello_activity); }}

20. The AndroidManifest lists application details<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.my_domain.app.helloactivity"> <application android:label="@string/app_name"> <activity android:name=".HelloActivity"> <intent-filter> <action android:name="android.intent.action.MAIN"/> <category android:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> </application>

21. main.xml <?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:background="#000044"><TextViewandroid:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello"/></LinearLayout>

22. Creating and Running simple HelloWorld applicationTo create a new project: 1. Start Eclipse 2. Select File > New > Project. 3. Select Android > Android Project, and click Next. 4. Enter Project name: HelloWorld. 5. Select Target Android 1.5. 6. Application name: Hello. 7. Package name: fafadia.tech. 8. Create Activity: HelloWorld. 9. Min SDK Version: 3. 10. Click Finish.

23. Creating HelloWorld.javapackage matos.demo;import android.app.Activity;import android.widget.Toast;public class HelloWorldextends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);Toast.makeText(getBaseContext(),“Wlecome to Hello World”,Toast.LENGTH_SHORT).show(); }}

24. Run HelloWorld applicationTo run android application 1.Run 2.Run > Select Android Application 3. Press ok

25. Adding more UI components to your applicationThere are to ways to add your UI componentsThrough coding (java code)Or defining in main.xmlXml codeJava codeTextViewtv = new TextView();Tv.setText(“Hello”);<TextViewandroid:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" />

26. Lets create a same application with UI componentspackage org.HelloWorld.com;import android.app.Activity;import android.os.Bundle;import android.widget.LinearLayout;import android.widget.ScrollView;public class HelloWorld extends Activity {public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// setContentView(R.layout.main);ScrollViewsv = new ScrollView(this);LinearLayoutll = new LinearLayout(this);ll.setOrientation(LinearLayout.VERTICAL);sv.addView(ll);this.setContentView(sv); }}

27. Adding components to Layoutfinal TextViewtv = new TextView(this);tv.setText(“Text Box");tv.setTextSize(20);tv.setTextColor(Color.BLACK);ll.addView(tv);Button b1 = new Button(this); b1.setText("Submit"); b1.setTextSize(15);ll.addView(b1); b1.setOnClickListener(new View.OnClickListener() { public void onClick(View v) {tv.setText(“Submit button Clicked”); });

29. Creating simple database applicationFirst we create a simple class which create a database, table. And the we perform insert and select query on table.Android uses SQLite for its database needs. SQLite is a very fast and lightweight database.Create New Project as MYDatabase and in that create new file named it as create_database.java.Import two files import android.database.Cursor;importandroid.database.sqlite.SQLiteDatabase;

30. Create_database filepackage org.example.mydatabase;import android.app.Activity;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.os.Bundle;import android.util.Log;import android.widget.TextView;public class create_database extends Activity { public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);super.onCreate(savedInstanceState);SQLiteDatabasemyDB= null; String TableName = "myTable"; String Data="";

31. /* Create a Database. */ try {myDB = this.openOrCreateDatabase("DatabaseName", MODE_PRIVATE, null); /* Create a Table in the Database. */myDB.execSQL("CREATE TABLE IF NOT EXISTS “+ TableName + " (Field1 VARCHAR, Field2 INT(3));"); /* Insert data to a Table*/myDB.execSQL("INSERT INTO “ + TableName+ " (Field1, Field2)" + " VALUES ('katrina', 25);"); /*retrieve data from database */ Cursor c = myDB.rawQuery("SELECT * FROM " + TableName , null);int Column1 = c.getColumnIndex("Field1");int Column2 = c.getColumnIndex("Field2"); // Check if our result was valid.c.moveToFirst();

32. if (c != null) { // Loop through all Results do { String Name = c.getString(Column1);int Age = c.getInt(Column2); Data =Data +Name+"/"+Age+"\n"; }while(c.moveToNext());}TextViewtv = new TextView(this);tv.setText(Data);setContentView(tv); }//end trycatch(Exception e) { System.out.println("Error", "Error", e);} finally { if (myDB != null) myDB.close(); } }}

34. Thank You

Introduction To Google Android (Ft Rohan Bomle)

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