1+ package com .javatechig .handlerexample ;
2+
3+ import java .io .InputStream ;
4+ import org .apache .http .HttpEntity ;
5+ import org .apache .http .HttpResponse ;
6+ import org .apache .http .HttpStatus ;
7+ import org .apache .http .client .methods .HttpGet ;
8+ import org .apache .http .impl .client .DefaultHttpClient ;
9+
10+ import com .javatechige .handlerexample .R ;
11+
12+ import android .app .Activity ;
13+ import android .app .ProgressDialog ;
14+ import android .graphics .Bitmap ;
15+ import android .graphics .BitmapFactory ;
16+ import android .os .Bundle ;
17+ import android .os .Handler ;
18+ import android .os .Message ;
19+ import android .util .Log ;
20+ import android .view .View ;
21+ import android .view .View .OnClickListener ;
22+ import android .widget .Button ;
23+ import android .widget .ImageView ;
24+
25+ public class MainActivity extends Activity {
26+
27+ private ProgressDialog progressDialog ;
28+ private ImageView imageView ;
29+ private String url = "http://www.9ori.com/store/media/images/8ab579a656.jpg" ;
30+ private Bitmap bitmap = null ;
31+
32+ public void onCreate (Bundle savedInstanceState ) {
33+ super .onCreate (savedInstanceState );
34+ setContentView (R .layout .activity_main );
35+
36+ imageView = (ImageView ) findViewById (R .id .imageView );
37+
38+ Button start = (Button ) findViewById (R .id .button1 );
39+ start .setOnClickListener (new OnClickListener () {
40+
41+ @ Override
42+ public void onClick (View arg0 ) {
43+ progressDialog = ProgressDialog .show (MainActivity .this ,
44+ "" , "Loading.." );
45+ new Thread () {
46+ public void run () {
47+ bitmap = downloadBitmap (url );
48+ messageHandler .sendEmptyMessage (0 );
49+ }
50+ }.start ();
51+
52+ }
53+ });
54+ }
55+
56+ private Handler messageHandler = new Handler () {
57+ public void handleMessage (Message msg ) {
58+ super .handleMessage (msg );
59+ imageView .setImageBitmap (bitmap );
60+ progressDialog .dismiss ();
61+ }
62+ };
63+
64+ private Bitmap downloadBitmap (String url ) {
65+ // Initialize the default HTTP client object
66+ final DefaultHttpClient client = new DefaultHttpClient ();
67+
68+ //forming a HttoGet request
69+ final HttpGet getRequest = new HttpGet (url );
70+ try {
71+
72+ HttpResponse response = client .execute (getRequest );
73+
74+ //check 200 OK for success
75+ final int statusCode = response .getStatusLine ().getStatusCode ();
76+
77+ if (statusCode != HttpStatus .SC_OK ) {
78+ Log .w ("ImageDownloader" , "Error " + statusCode +
79+ " while retrieving bitmap from " + url );
80+ return null ;
81+ }
82+
83+ final HttpEntity entity = response .getEntity ();
84+ if (entity != null ) {
85+ InputStream is = null ;
86+ try {
87+ // getting contents from the stream
88+ is = entity .getContent ();
89+
90+ // decoding stream data back into image Bitmap
91+ final Bitmap bitmap = BitmapFactory .decodeStream (is );
92+
93+ return bitmap ;
94+ } finally {
95+ if (is != null ) {
96+ is .close ();
97+ }
98+ entity .consumeContent ();
99+ }
100+ }
101+ } catch (Exception e ) {
102+ getRequest .abort ();
103+ Log .e (getString (R .string .app_name ), "Error " + e .toString ());
104+ }
105+
106+ return null ;
107+ }
108+ }
0 commit comments