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Android Apps Development for Mobile and Tablet Device (Level I) Lesson 5

X4-XT-CDP-0251-A @ Peter Lo 2015

Workshop

1. Create a simple Intent ( – 2)

․ Launch a Camera for Photo Taking

2. Create Intent with Parsing Data (Page 3 – 8)

․ Making Phone Call and Dial

․ Access Web Content

․ Playing YouTube Video

3. Create Intent with Extra (Page 9 – 11)

․ Sending SMS

․ Perform a Web Search

4. Create Intent with Action and Type (Page 12 – 13)

․ Sending Email

5. Create Intent with Result return (Page 14 – 17)

․ Voice Recognition

6. Create Master Detail Flow Fragment using system template (Page 18 – 19)


X4-XT-CDP-0251-A @ Peter Lo 2015 1

1. Simple Intent

1.1 Launch a Camera for Photo Taking 1. Create the Android application with the following attributes.

․ Application Name: MyPhotoIntent

․ Project Name: MyPhotoIntent

․ Package Name: com.example.myphotointent

2. Modify the source file "MainActivity.java" as follow: package com.example.myphotointent;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.content.Intent;

import android.provider.MediaStore;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

// Create the intent for launching the camera for photo taking

Intent myIntent = new Intent(MediaStore.ACTION_IM AGE_CAPTURE);

// Start the Intent activity

startActivity(myIntent);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}



3. Open the Android Manifest file, and press [Add] in the “Permission” tab. Then select “Uses

Permission” and press [OK].

4. Select the permission “android.permission.CAMERA” and save.

5. Save and execute the app, you should able to launch the camera for photo taking (This app does

not work properly in emulator).



2. Intent with Parse Data

2.1 Make Phone Call 1. Create the Android application with the following attributes.

․ Application Name: MyDialIntent

․ Project Name: MyDialIntent

․ Package Name: com.example.mydialintent

2. Modify the source file "MainActivity.java" as follow: package com.example.mydialintent;





import android.net.Uri;


@Override




// Define the data: phone number

String myData = "tel:27665111";

// Create the intent for display the phone dialer w ith the given number

Intent myIntent = new Intent(Intent.ACTION_DIAL, Ur i.parse(myData));



}

@Override




return true;



}

}

3. Save and execute the app, you should able to see the dial up screen with the telephone number.

4. Modify the source file "MainActivity.java" by changing word from “ACTION_DIAL” to

“ACTION_CALL”.





6. Select the permission “android.permission.CALL_PHONE” and save.

7. Execute the app again, you mobile will make a phone call to the number you input immediately.

2.2 Play YouTube Video 1. Create the Android application with the following attributes.

․ Application Name: MyYouTube

․ Project Name: MyYouTube

․ Package Name: com.example.myyoutube

2. Modify the source file "MainActivity.java" as follow: package com.example.myyoutube;







@Override






// Define the variables

Uri uri = Uri.parse("https://www.youtube.com/watc h?v=fy_3a5gFNJA");

uri = Uri.parse("vnd.youtube:" + uri.getQueryPara meter("v"));

// Create the intent for viewing YouTube

Intent intent = new Intent(Intent.ACTION_VIEW, ur i);


startActivity(intent);

}

@Override




return true;

}

}

3. Open the manifest file “AndroidManifest.xml”, and press [Add] in the “Permission” tab. Then

select “Uses Permission” and press [OK].



4. Select the permission “android.permission.INTERNET” and save.

5. Save and execute the app, the YouTube video will be shown.

2.3 Access Web Content 1. Create the Android application with the following attributes.

․ Application Name: MyWebIntent

․ Project Name: MyWebIntent

․ Package Name: com.example.mywebintent

2. Modify the source file "MainActivity.java" as follow: package com.example.mywebintent;







@Override






// Define the data: Web URL

String myData = "http://www.polyu.edu.hk";

// Create the intent for starting the browser

Intent myIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(myData));



}

@Override




return true;

}

}

3. Save and execute the app, you should able to see the PolyU website



3. Intent with Extra

3.1 Sending SMS 1. Create the Android application with the following attributes.

․ Application Name: MySMSIntent

․ Project Name: MySMSIntent

․ Package Name: com.example.mysmsintent

2. Modify the source file "MainActivity.java" as follow: package com.example.mysmsintent;







@Override




// Define the data: phone number

String myData = "smsto:27665111";

// Create the intent for sending SMS

Intent myIntent = new Intent(Intent.ACTION_SENDTO , Uri.parse(myData));

// The text is supplied as an Extra element called “sms_body”.

myIntent.putExtra("sms_body", "Testing Message");



}

@Override






return true;

}

}

3. Save and execute the app, you should able to see the SMS.

3.2 Perform a Web Search 1. Create the Android application with the following attributes.

․ Application Name: MySearchIntent

․ Project Name: MySearchIntent

․ Package Name: com.example.mysearchintent

2. Modify the source file "MainActivity.java" as follow: package com.example.mysearchintent;






@Override




// Create the intent for call web search



Intent myIntent = new Intent(Intent.ACTION_WEB_SE ARCH);

// Put the word “PolyU” to the intent for query

myIntent.putExtra(SearchManager.QUERY, "PolyU");



}

@Override




return true;

}

}

3. Save and execute the app, can you see the result for the searching?



4. Intent with Action and Type

4.1 Sending Email 1. Create the Android application with the following attributes.

․ Application Name: MyEmailIntent

․ Project Name: MyEmailIntent

․ Package Name: com.example.myemailintent

2. Modify the source file "MainActivity.java" as follow: package com.example.myemailintent;






@Override




// Define the variables for sending out email

String myEmailSubject = "Android Course";

String myEmailText = "Testing Email from your mob ile";

String emailReceiverList[] = {"[email protected] du.hk"};

// Create the intent for sending out email

Intent myIntent = new Intent(Intent.ACTION_SEND);

// Define the MIME type as plain text

myIntent.setType("text/plain");

// Assign the receiver, subject and email content to extra

myIntent.putExtra(Intent.EXTRA_EMAIL, emailReceiv erList);

myIntent.putExtra(Intent.EXTRA_SUBJECT, myEmailSu bject);

myIntent.putExtra(Intent.EXTRA_TEXT, myEmailText) ;





}

@Override




return true;

}

}

3. Save and execute the app, you should able to create the email:



5. Intent with Result Return

5.1 Voice Recognition 1. Create the Android application with the following attributes.

․ Application Name: MyVoiceRecognition

․ Project Name: MyVoiceRecognition

․ Package Name: com.example.myvoicerecognition

2. Remove the default text view “Hello World”

3. Right click the layout, and select Change Layout.

4. Change the layout to List View.



5. Modify the source file "MainActivity.java" as follow: package com.example.myvoicerecognition;





import android.speech.RecognizerIntent;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import java.util.ArrayList;


private static final int REQUEST_CODE = 1234;

private ListView resultList;

@Override




resultList = (ListView) findViewById(R.id.ListView1 );

// Create the intent for voice recognition

Intent myIntent = new Intent(RecognizerIntent.ACT ION_RECOGNIZE_SPEECH);

// Assign the corresponding parameter

myIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE _MODEL,

RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);

myIntent.putExtra(RecognizerIntent.EXTRA_PROMPT,

"AndroidBite Voice Recognition...");


startActivityForResult(myIntent, REQUEST_CODE);

}

@Override

protected void onActivityResult(int requestCode, in t resultCode, Intent data) {

super.onActivityResult(requestCode, resultCode, d ata);



if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {

// Return the result to the list

ArrayList<String> matches =

data.getStringArrayListExtra(RecognizerIntent.E XTRA_RESULTS);

resultList.setAdapter(new ArrayAdapter<String>(t his,

android.R.layout.simple_list_item_1, matches));

}

}

@Override




return true;

}

}



7. Select the permission “android.permission.INTERNET” and save.



8. Save and execute the app, then speech something to your mobile. (This app does not work

properly in emulator).



6. Fragment Template

6.1 Master Detail Flow 1. Create the Android application with the following attributes.

․ Application Name: MyFirstFragment

․ Project Name: MyFirstFragment

․ Package Name: com.example.myfirstfragment



2. The template will generate automatically, you can customize the fragment in the onCreateView()

method of “ItemDetailFragment.java”.

3. Execute the app using a mobile phone AVD.

4. Execute the app using a tablet AVD.

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