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Android Development Made Easy - With Sample Project
 

Android Development Made Easy - With Sample Project

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The information in this slide are from my discussion during the Android Training I conducted for CCA Java Class last October 02, 2012.

The information in this slide are from my discussion during the Android Training I conducted for CCA Java Class last October 02, 2012.

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    Android Development Made Easy - With Sample Project Android Development Made Easy - With Sample Project Presentation Transcript

    • Android DevelopmentMade Easy W I t h S a mp l e P r o j e c t by Joemarie Comeros Amparo
    • Outline: Overview on Android Installing ADT on Eclipse Explore Project Components Sample Project
    • Android is an open mobile phone platform that was developed by Google and later by Open Handset Alliance. Google defines Android as a "software stack" for mobile phones.Software stack is made up of operating system(the platform on which everything runs), the middleware (the programming that allows applications to talk to a network and to one another) and the applications (the actual programs that phone will run)
    • July 2005 - Google Inc. bought from Danger IncOpen Handset Alliance was formed headed by Google which is composed of companies like Intel, T- Mobile, Spring Nextel and more.In 2008, Android became available as an open source and ASOP(Android Open Source Project) is responsible for maintaining and development of android.February 2009, the first android version was released, Android 1.1. for Mobile G1.
    •  Android 1.1 Android 1.5 Cupcake Android 1.6 Donut Android 2.0/2.1 Eclair Android 2.2.x Froyo Android 2.3.x Gingerbread Android 3. x Honeycomb Android 4.0.x Ice Cream Sandwich Android 4.1 Jelly Bean
    • Note: When developing an application, consider the market share of the android version. Thehigher the market share, the higher number your target market is.
    • Note: Based on my development experience, ADT can run on at least Dual Core with atleast 2GB RAM.
    • Please refer to: www.developershaven.net
    • Activity• Present a visual user interface for one focused endeavor the user can undertake• Example: a list of menu items users can choose from Services• Run in the background for an indefinite period of time• Example: calculate and provide the result to activities that need it Broadcast Receivers• Receive and react to broadcast announcements• Example: announcements that the time zone has changed Content Providers• Store and retrieve data and make it accessible to all applications• Example: Android ships with a number of content providers for common Intents• Hold the content of a message• Example: convey a request for an activity to present an image to the user or let the user edit some text
    • public class CCSActivity extends Activity { /** Called when the activity is first created.*/ @Override public void onCreate(BundlesavedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); }}
    •  Run in the background  Can continue even if Activity that started it dies  Should be used if something needs to be done while the user is not interacting with application  Otherwise, a thread is probably more applicable  Should create a new thread in the service to do work in, since the service runs in the main thread Can be bound to an application  In which case will terminate when all applications bound to it unbind  Allows multiple applications to communicate with it via a common interface Needs to be declared in manifest file Like Activities, has a structured life cycle
    • SRC• The project source codeGEN• Auto generated code• Example: R.javaIncluded librariesResources• Drawables• Layout• Values like stringsManifest File• A must have xml file. Contains essential information about the system to the android system
    •  Auto-generated: you shouldn’t edit it Contains IDs of the project resources Enforces good software engineering Use findViewById and Resources object to get access to the resources  Ex. Button b = (Button)findViewById(R.id.button1)  Ex. getResources().getString(R.string.hello));
    •  Eclipse has a great UI creator  Generates the XML for you Composed of View objects Can be specified for portrait and landscape mode  Use same file name, so can make completely different UIs for the orientations without modifying any code
    •  Click ‘Create’ to make layout modifications When in portrait mode can select ‘Portrait’ to make a res sub folder for portrait layouts  Likewise for Landscape layouts while in landscape mode  Will create folders titled ‘layout-port’ and ‘layout-land’ Note: these ‘port’ and ‘land’ folders are examples of ‘alternate layouts’, see here for more info  http://developer.android.com/guide/topics/resources/providing- resources.html Avoid errors by making sure components have the same id in both orientations, and that you’ve tested each orientation thoroughly
    • <?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:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" android:id="@+id/tv_hello"/> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Large Text“android:textAppearance="?android:attr/textApp res/values/string.xmlearanceLarge"/></LinearLayout>
    • 1. Lunching a new activity without expecting without expecting a result2. Lunching a new activity and expecting a result when it finished.CalledActivity.class
    •  On Eclipse IDE. Go To File > New > Project > Android Project See image at the side for the prompt that appear. Click next button.
    •  Select android version. Tip: select the latest OS version available. You can add minimum and target SDK on your manifest file to support earlier android versions.
    •  Provide package name of your project. Valid package name consist of two names separated by a period.
    •  Provide package name of your project. Valid package name consist of two names separated by a period. Optional: Change minimum SDK for the lowest android version your application will support. Hit on finish
    •  Under res/layout on your In main.xml: project explorer. Open <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" main.xml. Create a layout android:layout_height="fill_parent" android:orientation="vertical" > like this: <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/button1" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button 2" /> <Button android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Button 3" /> </LinearLayout> <EditText android:id="@+id/editText1" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" > <requestFocus /> </EditText> </LinearLayout>
    •  Under res/values on your project explorer. Open strings.xml.<?xml version="1.0" encoding="utf-8"?><resources> <string name="hello">Hello World, SampleProjectActivity!</string> <string name="app_name">SampleProject</string> <string name="button1">Button 1 Clicked.</string></resources>NOTE: string with name button1 is being referenced by Button 1 android:text property.See main.xml in your layout.
    •  Under SRC on your project public class SampleProjectActivity extends Activity implements OnClickListener{ explorer. Open /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { SampleProjectActivity.java. super.onCreate(savedInstanceState); setContentView(R.layout.main); Toast.makeText(this, "Hello.", Toast.LENGTH_LONG).show(); //referencing components in our layout as set in setContentView, - main.xml Change code to this: //findViewById is used hence we components in our layout will be called //through their ids as set in android:id properties. See main.xml in your layout. Button btn1 = (Button)findViewById(R.id.button1); //one way in handling click event See comments for better btn1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { understand. application //Toast is a prompt that will notify user of what has happened in the //but not requiring user an action. Toast.makeText(getApplication(), "Button 1 Clicked", Toast.LENGTH_LONG).show(); } });import android.app.Activity; Button btn2 = (Button)findViewById(R.id.button2);import android.content.Intent; Button btn3 = (Button)findViewById(R.id.button3); //Other way of handling event inside an activityimport android.os.Bundle; btn2.setOnClickListener(this); btn3.setOnClickListener(this);import android.view.View; } @Overrideimport public void onClick(View v) { // TODO Auto-generated method stubandroid.view.View.OnClickListener; switch(v.getId()) {import android.widget.Button; case R.id.button2: EditText editText = (EditText)findViewById(R.id.editText1);import android.widget.EditText; editText.setText("Button 2 Clicked!"); break; case R.id.button3:import android.widget.Toast; // Intent with out waiting for result. // This is creating a new view and passing the new controll to the next view. Intent intent = new Intent(this, NextActivity.class); startActivity(intent); break; } } }
    •  Create NextActivity.java import android.app.Activity; import android.os.Bundle; Right click SRC folder > New import android.widget.Button; import android.widget.TextView; > Class. public class NextActivity extends Activity{ Change code to this: @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // you can have a new layout. but for this example // we will be reusing the main.xml as our layout. // we will just manipulate the text to inform user that //a new activity has been created. setContentView(R.layout.main); // setTitle - change the title of the next view setTitle("Next Activity"); //setting page title TextView pageTitle = (TextView)findViewById(R.id.pagetitle); pageTitle.setText("Hello, You are now in the Next Activity Class."); Button btn1 = (Button)findViewById(R.id.button1); btn1.setText("Option 1"); Button btn2 = (Button)findViewById(R.id.button2); btn2.setText("Option 2"); Button btn3 = (Button)findViewById(R.id.button3); btn3.setText("Option 3"); } }
    •  Open Manifest.xml in your <?xml version="1.0" encoding="utf-8"?> project explorer. <manifest xmlns:android="http://schemas.android.com/apk/re s/android" Register NextActivity class to package="com.sample" android:versionCode="1" your project. android:versionName="1.0" > Your new manifest file must <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="15"/> look like the code at the <application android:icon="@drawable/ic_launcher" side. android:label="@string/app_name" > <activity Save all the changes android:name=".SampleBradActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHE R" /> </intent-filter> </activity> <activity android:name=".NextActivity" android:label="@string/app_name" /> </application> </manifest>
    •  Right click your project name in your project explorer > RUN AS > ANDROID APPLICATION. Emulator will boot up. Wait until home screen is shown. Your application will be displayed on the screen. You can now enjoy the application. Congratulations!!!
    •  Installation: http://developershaven.net Google API: http://mfarhan133.wordpress.com/2010/10/01/generate-google-maps-api-key-for-android/ Android Developer’s Website : http://developer.android.com/index.html Numerous Forums & other developer sites, including:  http://www.javacodegeeks.com/2011/02/android-google-maps-tutorial.html  http://efreedom.com/Question/1-6070968/Google-Maps-Api-Directions  http://stackoverflow.com  http://www.anddev.org/google_driving_directions_-_mapview_overlayed-t826.html
    • Joemarie Comeros Amparo about.me/joemarieamparo Skype/Ymail/Gmail : joemarieamparo Facebook: joemarieamparo@yahoo.com