Cara cara membuat Android 2

8/10/2019 Cara cara membuat Android 2

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ASMATT (1207@..) 1

A A

D

S II

R


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A A D (S II) 35 N 2014

ASMATT (1207@..) 2

C A P P F >> N >> P >> A A

P

E A N, P N & P

N;


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ASMATT (1207@..) 3

A A D

C E

C

E: =>

A D

M, C N


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A A D (S II) 35 N 2014

ASMATT (1207@..) 4

B E A1) S API(C A API 19)

2) S D S ( 5.1).

5) C . A . C

.

3) G . N .

4)C N

E

1) E

()

2) C

3) C

4) C


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ASMATT (1207@..) 5

ANDOID CODING

B & C H

O . ( )


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ASMATT (1207@..) 6

A E, B &


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A A D (S II) 35 N 2014

ASMATT (1207@..) 7

A C

O .

A ( L 21):17.

A C

O FBHA.

A C()

B

()

A (

C)

C


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A A D (S II) 35 N 2014

ASMATT (1207@..) 8

FBHA.1. ..BH;

2. ..A;

3. ..B;

4. ..;

5. ..E;

6. ..;

7. MFBHAA

8. /** C . */

9. @O

10. C(B I)

11. .C(I);

12. C(R..);

13.

14.

15. C( )

16. // 1 .

17. E1= (E) BI(R..1);

18. // ()

19. = 1.().();

20. // 1 .

21. 1= () BI(R..1);

22. // ( )

23. 1.(" N: "+ );

24. 25.

S

C

.

M N(C HN)


9/94

A A D (S II) 35 N 2014

ASMATT (1207@..) 9

B C H

HNA.

1. N( )

2. E= (E) BI(R..1);

3. = .().();

4. = F.()

5. = ((* 9) / 5) + 32;

6.

7. 1= () BI(R..1);

8. 1.(+ " C "+

9. + " F.");

10.

/ ,

38.0C 100.4 F.

E:

P 3 C


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A A D (S II) 35 N 2014

ASMATT (1207@..) 10

:

M C

E: M C

1. C( )

2. E1= (E)BI(R..1);

3. 1= 1.().();

4. I1= I.(1)

5. E2= (E)

BI(R..2);6. 2= 2.().();

7. I2= I.(2)

8. = I1*I2;

9. = ()BI(R..2);

10. .("R : "+ );

11.


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ASMATT (1207@..) 11

E:

B C

DUPLICATING & IMPORTING

AN ANDROID PROJECT


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A A D (S II) 35 N 2014

ASMATT (1207@..) 12

D A P

S C &

P ( E)

H

CC (C)

C (P)

E

C A

E: F > I

C A >E A

C I N > B >

OK > > F


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ASMATT (1207@..) 13

U B S

26

The ifstatement has the following syntax:

if ( condition) {

statement(s);}

if is a Javais a Javais a Javais a Java

reserved wordreserved wordreserved wordreserved word

TheTheTheThe conditionmust be amust be amust be amust be a

booleanbooleanbooleanboolean expression. It mustexpression. It mustexpression. It mustexpression. It must

evaluate to either true or false.evaluate to either true or false.evaluate to either true or false.evaluate to either true or false.

If theIf theIf theIf the conditionis true, theis true, theis true, theis true, the statement(s) is executed.is executed.is executed.is executed.

If it is false, theIf it is false, theIf it is false, theIf it is false, the statement(s) isisisis skipped.skipped.skipped.skipped.


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ASMATT (1207@..) 14

27

O A condition often uses one of Java's equality operators or

relational operators, which all return boolean results:

==

!=

<

>

=

: O E N


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A A D (S II) 35 N 2014

ASMATT (1207@..) 15

: O E N

1. E = (E) BI(R..1);

2. = .().();

3. = I.()

4. = "N ";

5. (%2 == 0) // (/2*2 == )

6. = "EEN";

7.

8. = "ODD";

9.

10. = () BI(R..2);

11. .(" "+ );

E: P F?

R

D .

50 & .


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A A D (S II) 35 N 2014

ASMATT (1207@..) 16

: B C & I

H://.

IDEO

L & R


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A A D (S II) 35 N 2014

ASMATT (1207@..) 17

1. C(B I)

2. .C(I);

3. C(R..);

4.

5. = "://../S/M/HTTP/H264/ TM/H2642T4480320.4";

6. = .();

7. = () BI(R..1);

8.

9. MC = MC();

10. .MC();11. .RI();

12. .F();

13. .OPL(OL()

14. PB=(PB) BI(R..B1);

15.

16. (M )

17. . (.E);// C

18. .A();

19. .();

20.

21. );

22.


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ASMATT (1207@..) 18

1. C(B I)

2. .C(I);

3. C(R..);

4.

5. = "://..//3073/.4";

6. = .();

7. = () BI(R..1);

8.

9. MC = MC();

10. .MC();

11. .RI();

12. .F();

13. .OPL(OL()

14. PB=(PB) BI(R..B1);

15.

16. (M ) 17. . (.E);// C

18. .A();

19. .();

20.

21. );

22.


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ASMATT (1207@..) 19

L 1. C(B I)

2. .C(I);

3. C(R..);

4. = .(".://"+A().()+"/"+..);

5. = ()BI(R..1);

6. MC = MC();7. .MC();

8. .RI();

9. .();

10.

PLA AN ADIO

1. MA A

2. M ;

3. @O

4. C(B I)

5. .C(I);

6. C(R..);

7. = M();

8.

9.

10. ( )

11. = MP.(A.,

..)

12. .();

13.

14.

M P .


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ASMATT (1207@..) 20

ALKING ANDOID

A I!

:

1. MAAOIL

2. ;

3.

4. @O5. C(B

I)

6. .C(I);

7. C(R..);

8. = (, );

9.


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A A D (S II) 35 N 2014

ASMATT (1207@..) 21

:

10. @O

11. I(0)

12. // ODOA

13. .L(L.);

14. .R(());

15. .(,.EEF, );

16.

17.

OCH HANDLING


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A A D (S II) 35 N 2014

ASMATT (1207@..) 22

: A LC A

/

E.

E: S > O/I

T

A .

T.T(, O T", T.LENGTHSHORT).();

T : T T

H T

..T;

I OA IDGE


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A A D (S II) 35 N 2014

ASMATT (1207@..) 23

: , M & L E

: E

1. @O

2. E(ME )

3. = .A();

4. (==ME.)

5. .(AC(),"... ", .E).();

6.

7. ;

8.


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ASMATT (1207@..) 24

: D E

1. GAA

2. 1, 2;

3. 1, 2;

4. @O

5. C(BI)

6. .C(I);7. C(R..);

8.

: D E

9. @O

10. E(ME )

11. = .A();

12. ()

13. ME.

14. 1= .();15. 1= .();

16. ;

17. ME.

18. 2= .();

19. 2= .();


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ASMATT (1207@..) 25

: D E20. //

21. (1< 2) // (21>50)

22. .(, " ",.E).();

23.

24. //

25. (1> 2) // (12> 50)

26. .(, " ",.E).();

27.

28. // P D

29. (1< 2)

30. .(, " ",.E).();

31.

: D E

32. // D P

33. (1> 2)

34. .(," ",.E).();

35.

36. ; // MOE

37.

38. ;

39.


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ASMATT (1207@..) 26

E

,

.

,

.

OPEN ANOHE LAO


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ASMATT (1207@..) 27

O A L

T

C().

: O A L


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A A D (S II) 35 N 2014

ASMATT (1207@..) 28

: O A L

1. MAA

2. @O

3. C(B I)

4. .C(I);

5. C(R..);

6.

7. OL2( )

8. C(..)

9.

10.

E: O A L

T BACK

(

).


29/94

A A D (S II) 35 N 2014

ASMATT (1207@..) 29

E: O A L

1. OL2( )

2. C(R..);

3.

4. HBACK( )

5. C(R..);

6.

E: O A L


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ASMATT (1207@..) 30

E: O A L

( )

1. @O

2. E(ME )

3. // ODOA

4. = .A();

5. (==ME.)

6. C(R..);

7.

8. ;

9.

ACION BA MEN


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A A D (S II) 35 N 2014

ASMATT (1207@..) 31

: C A B M

: C A B M

2 :

L

. ( > ).

O

OI(MI )

S H

L D A B


32/94


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A A D (S II) 35 N 2014

ASMATT (1207@..) 33

: C A B M15.

21.

27.

33.

: C A B M

.: ( & OI)

1. @O

2. OI(MI )

3. // H .

4. // H/ ,

5. // AM..

6. = .II();

7. ( == ..)

8. C(R..);

9.

10. ( == ..2)

11. C(R..2);

12.


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ASMATT (1207@..) 34

: C A B M .: ( & OI)

13. ( == ..)

14. = MP.(AC(),..);

15. .();

16.

17. ( == ..)

18. .();

19. 20. ( == ..)

21. C(R..);

22.

23. .OI();

24.

DPLICAING & IMPOING

AN ANDOID POJEC


35/94

A A D (S II) 35 N 2014

ASMATT (1207@..) 35

D A P

S C &

P ( E)

H

CC (C)

C (P)

E

C A

E: F > I

C A >E A

C I N > B >

OK > > F


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ASMATT (1207@..) 36

D I

:

D I


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A A D (S II) 35 N 2014

ASMATT (1207@..) 37

A 2.3.3


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ASMATT (1207@..) 38

1. HD( )

2. = "://.//./"+

3. "/////2013/ANDROID.";

4.

5. .(AC(), "...",

.E).();

6. B R = BF.(()

7. L().C());

8. I = (I) BI(R..1);

9. .IB(R);

10. .(AC(), " D...",

.E).();

11. (E )

12.


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ASMATT (1207@..) 39

N

E API19

: D

A


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ASMATT (1207@..) 40

: D A

1. MAABA

2. ="://.//./"+"/////2013/ANDROID." ;

3. @O

4. C(B I)

5. .C(I);

6. C(R..);

7.

8. HD( ) 9. D().();10. .(AC(), " ...",

.E).();

11.

: D A

12. DA

13. @O

14. B IB(... 0)

15. B R = ;16.

17. R =BF.(()

().C());

18. (E )

19. ;

20.


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ASMATT (1207@..) 41

: D A

21. E(B)

22. .(AC()," ...",

.E).();

23. I = (I)BI(R..1);

24. .IB();

25.

26.

27.

(2014)

T/AT


42/94

A A D (S II) 35 N 2014

ASMATT (1207@..) 42

A?

When an Android application is first started, the runtime system

creates a single thread in which all application components will run

This thread is referred to as the main thread(also known as UI thread,

since it modifies the user interface and handles input events)

All code of an Android application (incl. additional components) runs in the

main thread and every statement is executed after each other

If you perform a long lasting operation(e.g accessing data from the Internet)

the application is blocked until the corresponding operation has finished.

A?

Android enforces a worst case reaction time of applications.

If an activity does not react within 5 seconds to user input,

the Android system displays an Application not responding (ANR) dialog.

From this dialog the user can choose to stop the application

NOTE!


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ASMATT (1207@..) 43

LOGO

Android AsynTask

Enables proper and easy use of the UI thread. Thisclass allows to perform background operations and

publish results on the UI thread without having to

manipulate threads and/or handlers.

Introduction

AsyncTask is a generic class, it uses 3 types:

AsyncTask.

Params the input. What you pass to the

AsyncTask

Progress if you have any updates, passed toonProgressUpdate()

Result the output. What returns doInBackground()

Example:private class MyTask extends AsyncTask { }

OR

private class MyTask2 extends AsyncTask { }


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ASMATT (1207@..) 44

Introduction

The most common methods you will need to

implement (overrides) are these:

1. onPreExecute() called on the UI thread

before the thread starts running.

2. doInBackground(Params)put all the code

you want the application to perform in

background.

3. onProgressUpdate() - called when you invokepublishProgress() in the doInBackground().

4. onPostExecute(Result) called after the

background thread finishes.

Example

Hello World! Become

Downloading

Then progressing

values will appear

Final msg, All Done!


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ASMATT (1207@..) 46

Example

33. @O

34. (I... )

35. .();

36. .("P : "+ 0);

37.

38. @O

39. E( )

40. .E();

41. .();

42.

43.

44.

Input from 2nd paramof the AsynTask cls

Input from 3rd param

of the AsynTask cls

Summary

1. A( )

2. M().("://.." );

3.

4. MA

5. E()

6.

7. IB(... )

8. P();

9. "A D!";

10.

11. (I... )

12.

13. E( )

14.

15.


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ASMATT (1207@..) 47

Summary

1. A( )

2. M().();

3.

4. MA

5. E()

6.

7. IB(... )

8. P();

9. ;

10.

11. (I... )

12.

13. // E( )

14. // NO IMPLEMENED

15.

D C:

O 1. MA ABA

2. = "://.//./"

3.

4. @O

5. C(B I)

6.

7. HD( )

8. D().();

9.

10. D A

11. @O

12. BIB(... 0)

13. ;

14.

15. E(B)

16.

17.

1

2

3


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A A D (S II) 35 N 2014

ASMATT (1207@..) 48

D C:

A I1. MA ABA

2. = "://.//./"

3.

4. @O

5. C(B I)

6.

7. HD( )

8. D().();

9.

10. D A

11. @O

12. BIB(... 0)

13. ;

14.

15. E(B)

16.

17.

C ( PE?

T.((), " ",

T.)()

I = (I)

BI(R..)

.IB();

D C:

A I1. MA ABA

2. = "://.//./"

3.

4. @O

5. C(B I)

6.

7. HD( )

8. D().();

9. .(AC(), " ...",

10. .LENGHLONG).();

11.

12. D A

13. @O

14. BIB(... 0)

15. ;

16.

17.

C A

?

T.((), "

",

T.)()


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A A D (S II) 35 N 2014

ASMATT (1207@..) 49

D C:

A I ( )P

AT ,

,

O/I

M

D C:

A I ( 1 )

1. HD( )

2. = ://.//./ +"/////2013/ANDROID." ;

3. D().();4.

5. DA

6. @O

7. B IB(... 0) 8. B R = ;

9.

10. R = BF.(()

(00).())


50/94

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ASMATT (1207@..) 50

D C:

A I ( 1

)1. DA

2. @O

3. B IB(... 0)

4.

5. F= L(00).C().CL();

6. (F);

7. R = BF.(()

(00).())

8. (E )

9. @O

10. (I... )

11. .();

12. .(AC(), " =

"+0, .E).();

13.

(2014)

EA: DONLOAD IMAGE FOM

HE INENE


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ASMATT (1207@..) 51

I A P

Before your application can access the Internet, it needs

to be

granted permission for Internet access..

Add this in the AndroidManifest.xml:

B T

Starting with Android 3.0 (Honeycomb) you may not

perform

network operations on your main UI thread

This will cause a NetworkOnMainThreadException

In order to solve this, you need to use background

thread:

Handler

or

AsyncTask


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A A D (S II) 35 N 2014

ASMATT (1207@..) 52

D I: E

Try to do this application:

(Use AsyncTask for the downloading task)

Downloading the image must be performed as

a background task (NEVER in the main UI

thread)

Therefore, in this example, we will use

AsyncTask for the downloading job.

D I: E

U : ://..//0202/B.


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ASMATT (1207@..) 53

1. Create the main layout (xml) for your

Activity. It should have:

A TextView for the title

A ProgressBar (initially invisible) to show

progress

A TextView to display % progress

An ImageView to display the downloaded

image(set background color to black)

An EditText to enter the image URL

A Button to start the downloading

D I: E

2. In your Activity class,

get handles to the all of the views used (call findViewById( ))

inside the onCreate() method

define the button onclick method. In this method:

Get the String from the url address TextView

Create the AsyncTask object & call its execute() method bypassing the url address(String) as its parameter

public void download(View v) {

String url = etUrl.getText().toString().trim();

new ImageDownloader().execute(url);}

*ImageDownloaderis the name of

our AsyncTask

D I: E


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A A D (S II) 35 N 2014

ASMATT (1207@..) 54

3. Create a subclass of AsyncTask names ImageDownloader, as a

private inner class inside your Activity class

- Use the three generic types as specified:

private class ImageDownloader extends

AsyncTask {

}

D I: E

4. Override all the fourmethods in your AsyncTask , starting with the

onPreExecute() method.

- This is for initialising purpose

@Override

protected void onPreExecute() {progress = 0; //declare this int variable as global in your AsyncTaskpb.setVisibility(View.VISIBLE);

Toast.makeText(LoadImageAsyncTaskActivity.this,

"starting download", Toast.LENGTH_SHORT).show();

super.onPreExecute();

}

onPreExecute() method:

D I: E


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ASMATT (1207@..) 55

5. Override the doInBackground () method.

- This is for the background task done by the background thread

@Override

protected Bitmap doInBackground(String... urls) {

Bitmap bmp = loadImageFromNetwork(urls[0]); //do the loading taskwhile (progress < 100) {

progress += 1;

publishProgress(progress); //update progress to UI thread

SystemClock.sleep(100); //to slowdown the system

}

return bmp;}

doInBackground() method:

D I: E

6. Override the onProgressUpdate () method.

- This is to show download progress in the ProgressBar and

TextView on main UI thread

@Override

protected void onProgressUpdate(Integer... values) {

pb.setProgress(values[0]);

percent.setText(values[0] + "%");

}

onProgressUpdate() method:

D I: E


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ASMATT (1207@..) 56

D I E

7. Override the onPostExecute () method.

- This is to display the result (image) in the ImageView &

a message that download has completed (using Toast)

@Override

protected void onPostExecute(Bitmap result) {

img.setImageBitmap(result);Toast.makeText(LoadImageAsyncTaskActivity.this,

"download complete", Toast.LENGTH_SHORT).show();

}

onPostExecute() method:

8. Define the loadImageFromNetwork () method.

- This method do the actual work of loading the image from the

given url address

private Bitmap loadImageFromNetwork(String url) {

try {

Bitmap bitmap = BitmapFactory.decodeStream((InputStream) new URL(url).getContent());

// URL urlObj = new URL(url);

// InputStream in = (InputStream) urlObj.getContent();//Bitmap bitmap = BitmapFactory.decodeStream(in);

return bitmap;

} catch (Exception e) {

e.printStackTrace();Log.d("getBmpFromUrl error: ", e.getMessage().toString());

return null;

}

}

loadImageFromNetwork() method:

D I: E


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ASMATT (1207@..) 57

9. Add permission for Internet access in your manifest file.


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ASMATT (1207@..) 58

(2014)

: D F

(2014)

: D F

1. F( )

2. I = ;

3. = "";

4. = "://./100";

5. = ()

BI(R..1);

6. .("RL: "+ );


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ASMATT (1207@..) 59

(2014)

: D F7.

8. // F

9. = DHC().(

HG()).E().C();

10. // BR

11. BR = B(

I());

12. //R R

13. ( = .L(); != ; =

.L())

14. += ;15. .();

16. (E )

17. E = (E) BI(R..1);

18. .();

(2014)


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ASMATT (1207@..) 60

(2014)

: D F

( )

1. MAABA

2. I= ;

3. = "";

4. = "://./100";

5. @O

6. C(B I)

7. .C(I);

8. C(R..);

9.

(2014)

: D F

( )

10. F( )

11. = () BI(R..1);

12. .("RL: "+ );

13. = F();

14. E = (E) BI(R..1);

15. .();

16.


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A A D (S II) 35 N 2014

ASMATT (1207@..) 61

(2014)

: D F

( )

17. F ( )

18.

19. = DHC().(

HG()).E().C();

20. BR = B(

I());

21. ( = .L(); != ; =

.L())

22. += ;

23. .();

24. (E )

25.L.("", .());

26.

27.;

28.

(2014)

H & H E


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ASMATT (1207@..) 62

(2014)

H & H E

1.

(2014)

H & H E

1. F( )

2. = () BI(R..1);

3. .("RL: "+ );

4. = F();

5. E = (E) BI(R..1);6. .(.)

7. .();

8.


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:

D F A

(2014)

:

D F A

1. F( )

2. = () BI(R..1);

3. .("RL: "+ );

4. MDF().();5.

6. MDFA

7. @O

8. IB(... )

9. // ODOA

10. = F();

11. ;

12.


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:

D F A

13. @O

14. E( )

15. // ODOA

16. .E();

17. E = (E) BI(R..1);

18. .(.BE);

19. .(R);

20.

(2014)

: D F

P ( )


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(2014)

: D F

P ( )

1. F( )

2. = () BI(R..1);

3. MDF().();

4.

5. MDFA

(2014)

: D F

P ( )

6. @O

7. IB(... ) 8. = "";

9.

10. // F

11. = DHC().(HG()).E().C();

12. // BR

13. BR = B(I());14. //R R

15. ( = .L(); != ; = .L())

16. += ;

17. ();18. 19. .();

20. (E )

21. L.("", .());

22.

23. ;

24.


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(2014)

: D F

P ( )

25.@O

26. (... )

27.// ODOA

28. .();

29. .("R : "+

0);

30.

(2014)

:

D P F


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(2014)

:

D P F

S

(

ET).

(2014)

:

D P F

1. @O

2. E(

)

3. // ODOA

4. .E();

5. = ()

BI(R..1);

6. .D(R, "/", );

7.


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(2014)

: D P F

D L

(2014)

: D P F

D L

1. F( )

2. E = (E)BI(R..1);

3. RL=.().().();

4. = () BI(R..1);

5. .("RL: "+ RL);

6. MDF().(L);7.

8. MDFA


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: D P F

D L9. @O

10. IB(... ) 11. // ODOA

12. = "";

13. L = 0;14.

15. // F

16. = DHC().(

HG(L)).E().C();17. // BR

18. BR = B(I());

19. //R R

20. ( = .L(); != ; = .L())

21. += ;

22. //P();23.

24. .();

25. (E )

26. L.("", .());

27.

28. ;29.

(2014)

A


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ASMATT (1207@..) 71

(2014)

A D :

A

(2014)

A D :

A


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ASMATT (1207@..) 72

(2014)

A D :

A A

(2014)

JON (JS O N)

ML


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(2014)

JON (JS O

N)

() JSON

() JSON

A JSON . P / JSON

E , .

(2014)

JON P

3 :

D JSON

P

D ()


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ASMATT (1207@..) 74

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JON P

1: D JON F

F

,

JSON URL, ..

="://.../

/.";

(2014)

JON P E

1: D JON F


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JON P

2: P JON F

(2014)

JON P

2: P JON F

F JSON ,

JSONO JSON . I

:

JONO = JONO(JON);

A JSON /

:

JONO = .JONO("");

C = .("");


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JON P

2: P JON F1. JON( JON)

2. // ODOA

3. JONO O;

4. D, ;

5.

6. O = JONO(JON);

7. D = O.("");

8. = O.("");

9. .(AC(),

" D: "+D+" "+,.E).();

10. (JONE )

11.

(2014)

JON P

3: D O/D


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JON P

3: D O/D

1. JONO O;

2. D="", ="";

3.

4. O = JONO(JON);

5. D = O.("");

6. = O.("");

7. (JONE )

8. D = ()BI(R..3);

9. =()BI(R..4);

10. D.(" D: "+D);

11. .(" : "+);

(2014)

JON P

P JON F A O


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JON P

P JON F A O

1. JON( JON)

2. // ODOA

3. JONO O;

4. M="", ="",

="";

5. O = " M

:";

6.

7. O = JONO(JON);

(2014)

P JON F

A O

8. // G JON A

9. JONA A =

O.JONA

("");

10. // A 11. ( = 0; 0) {

byte[] b = new byte[4096];n = in.read(b);

if (n > 0)

out.append(new String(b, 0, n));}

return out.toString();

}

getResultFromEntity() method:

E : A S C R A

8. Add permission for Internet access in your manifest file.


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I

, /.

I II

O .

T

, .

T OAP E.

A SOAP ,


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ASMATT (1207@..) 90

I (E)

REST ( REST) S .

M REST, T, F, F, .

REST , , HTTP.

A JSON(JS O N) ML.

JON

S JSON :

"" :

"": "1234",

"" : "","" : ""

I JSON :

"" :

"": "1234",

"" : "","" : ""

..JSONE;

..JSONO;


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ASMATT (1207@..) 91

JON II1. S ;

2. S ;

3. S ;

4. S S = """ : "": "1234","" :

A","" : A S"";

5.

6. JSONO O= JSONO(S);

7. JSONO O = O.JSONO("");

8. = O.S("");

9. = O.S("");

10. = O.S("");

11.

12. (JSONE )

13.

P JSON

The results from List operation is in JSON format.

We have to parse the JSON formatted massage to extract the data inside it

e.g. how to obtain only the names and phone numbers from the message


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P JSON

To parse JSON message, youll need these Java classes from

org.json package:

JSONObject

JSONArray

Also need the StringBuilder to append the string, representing

each of the JSON object, extracted from JSON message

P JSON

1. We need to do the parsing in the AsyncTask onPostExecute method:

(you can modify this method from the last example)

protected void onPostExecute(String result)

Notice that this method receives a string parameter, result, which contain

the JSON message that we are going to process. Also declare the

StringBuilder:StringBuilder contactResult = new StringBuilder();

2. The JSON processing methods can throw exceptions, so add try and

catch blocks next:try {

}catch (Exception e) {

et.setText(Something went wrong!");

e.printStackTrace();

}


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P JSON

3. Inside the try block, create a JSONObject, passing the JSON result

as the parameter:

JSONObject resultObject = new JSONObject(result ) ;

4. We need to retrieve this contact array, using its name: Contacts. Get

the Contacts array from the JSON Object:

JSONArray contactArray = resultObject.getJSONArray("Contacts");

P JSON

5. After fetching the contact array, add a for loop to iterate through the

contacts:

for (int t=0; t


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P JSON

7. Now retrieve the person name from this object, appending it to the

String Builder :

contactResult.append(contactObject.getString("name")+ ": ");

8. Next, retrieve the phone number from the object, also appending it to

the String Builder and ended with a new line character:

contactResult.append(contactObject.getString("telNo")+ "\n");

P JSON

9. Now move to after the catch block. If the processing has worked, we

display the result (convert the StringBuilder to String) in the EditText ,

otherwise we display an error message::

if(contactResult length()>0)

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