Notification Manager:

* Transient notifications are not called notifications anymore. They are now called android.widget.Toasts. This name may not be permanent, but the rest of the API should be quite settledTransient notifications are not called notifications anymore. They are now called android.widget.Toasts. This name may not be permanent, but the rest of the API should be quite settled.

cyberrob wrote:Hi Plusminus,
The NotificationManager in the sample code, sad to say that new SDK m5 not support it!

plusminus wrote:

Doing HTTP Post with Android

What you will learn: You will learn how to do HTTP Post from within Android.

Problems/Questions: Write them right below...

Difficulty: 2 of 5

What it will look like:

Description:
0.) HTTP is a request-response protocol. Various types of requests are possible, each identified by a different HTTP method. Her we will use the POST-Method.

1.) So we will once again start, where all Activities start. We will do some simple preparation first:

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Syntax: [ Download ] [ Show ]

Using java Syntax Highlighting

1.         @Override
2.         public void onCreate(Bundle icicle) {
3.                 super.onCreate(icicle);
4.  
5.                 /* Create a new HTTP-RequestQueue. */
6.                 android.net.http.RequestQueue rQueue = new RequestQueue(this);
7.                
8.                 /* Prepare the Post-Text we are going to send. */
9.                 String POSTText = null;
10.                 try {
11.                         POSTText = "mydata=" + URLEncoder.encode("HELLO, ANDROID HTTPPostExample - by anddev.org", "UTF-8");
12.                 } catch (UnsupportedEncodingException e) {
13.                         return;
14.                 }
15.                 /* And put the encoded bytes into an BAIS,
16.                  * where a function later can READ bytes from. */
17.                 byte[] POSTbytes = POSTText.getBytes();
18.                 ByteArrayInputStream baos = new ByteArrayInputStream(POSTbytes);

Parsed in 0.033 seconds, using GeSHi 1.0.8.4

2.) Preparation is done now, now we will do the interesting stuff:

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Using java Syntax Highlighting

1.                 /* Create a header-hashmap */
2.                 Map<String, String> headers = new HashMap<String, String>();
3.                 /* and put the Default-Encoding for html-forms to it. */
4.                 headers.put("Content-Type", "application/x-www-form-urlencoded");
5.                
6.                 /* Create a new EventHandler defined above, to handle what gets returned. */
7.                 MyEventHandler myEvH = new MyEventHandler(this);

Parsed in 0.035 seconds, using GeSHi 1.0.8.4

:idea: MyEventHandler is described in step 5.)

3.) I prepared a very simple php-file on my server, which will simply echo the 'mydata' variable posted to it:

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Using php Syntax Highlighting

1.                  <?php
2.                                 echo "POSTed data: '".$_POST['mydata']."'";
3.                  ?>

Parsed in 0.062 seconds, using GeSHi 1.0.8.4

4.) So we will call the queueRequest of our RequestQueue with the following parameters:

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Using java Syntax Highlighting

1. "http://www.anddev.org/postresponse.php",  // The location of the php-file
2. "POST", // The Request-'Mode'
3. headers, // The Header which tells we will have some POST-vars
4. myEvH, // our eventhandler
5. baos, // our POST-String(converted to bytes) and ready to be sent
6. POSTbytes.length, // amount of the bytes in 'baos' to be sent
7. false // dunno <img src="http://www.anddev.org/images/smilies/hmm.png" alt=":?" title="Confused" />

Parsed in 0.036 seconds, using GeSHi 1.0.8.4

So as a real implementated call it looks like this:

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Using java Syntax Highlighting

1.                 /* Calls a php-file I prepared. It looks like:
2.                  * <?php
3.                  *              echo "POSTed data: '".$_POST['data']."'";
4.                  * ?>*/
5.                 rQueue.queueRequest("http://www.anddev.org/postresponse.php", "POST",
6.                                 headers, myEvH, baos, POSTbytes.length,false);
7.  
8.                 /* Wait until the request is complete.*/
9.                 rQueue.waitUntilComplete();
10.         }

Parsed in 0.035 seconds, using GeSHi 1.0.8.4

5.) The last thing we have is a small nearly dummy-class, the MyEventHandler, which simple reacts on events that occur during the "answer" of the requested url called. There basically are just two functions that actually do something:

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1.                 public void data(byte[] bytes, int len) {
2.                         baf.append(bytes, 0, len); // Add received data to a buffer }
3.  
4.                 public void endData() {
5.                         String text = new String(baf.toByteArray()); // Conert Buffer to String
6.                         myShowNotificationAndLog("Data loaded: n" + text); // Log what was returned }

Parsed in 0.036 seconds, using GeSHi 1.0.8.4

Thats it

The Full Source:

"/src/your_package_structure/HTTPPostExample.java"

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Using java Syntax Highlighting

1. package org.anddev.android.webstuff;
2.  
3. import java.io.ByteArrayInputStream;
4. import java.io.UnsupportedEncodingException;
5. import java.net.URLEncoder;
6. import java.util.HashMap;
7. import java.util.Iterator;
8. import java.util.Map;
9.  
10. import org.apache.http.util.ByteArrayBuffer;
11.  
12. import android.app.Activity;
13. import android.app.NotificationManager;
14. import android.net.http.EventHandler;
15. import android.net.http.Headers;
16. import android.net.http.RequestQueue;
17. import android.net.http.SslCertificate;
18. import android.os.Bundle;
19. import android.util.Log;
20.  
21. public class HTTPPostExample extends Activity {
22.  
23.         // ===========================================================
24.         // Fields
25.         // ===========================================================
26.        
27.         private final String DEBUG_TAG = "httpPostExample";
28.  
29.         // ===========================================================
30.         // 'Constructors'
31.         // ===========================================================
32.  
33.         @Override
34.         public void onCreate(Bundle icicle) {
35.                 super.onCreate(icicle);
36.  
37.                 /* Create a new HTTP-RequestQueue. */
38.                 android.net.http.RequestQueue rQueue = new RequestQueue(this);
39.                
40.                 /* Prepare the Post-Text we are going to send. */
41.                 String POSTText = null;
42.                 try {
43.                         POSTText = "mydata=" + URLEncoder.encode("HELLO, ANDROID HTTPPostExample - by anddev.org", "UTF-8");
44.                 } catch (UnsupportedEncodingException e) {
45.                         return;
46.                 }
47.                 /* And put the encoded bytes into an BAIS,
48.                  * where a function later can read bytes from. */
49.                 byte[] POSTbytes = POSTText.getBytes();
50.                 ByteArrayInputStream baos = new ByteArrayInputStream(POSTbytes);
51.                
52.                 /* Create a header-hashmap */
53.                 Map<String, String> headers = new HashMap<String, String>();
54.                 /* and put the Default-Encoding for html-forms to it. */
55.                 headers.put("Content-Type", "application/x-www-form-urlencoded");
56.                
57.                 /* Create a new EventHandler defined above, to handle what gets returned. */
58.                 MyEventHandler myEvH = new MyEventHandler(this);
59.  
60.                 /* Now we call a php-file I prepared. It is exactly this:
61.                  * <?php
62.                  *              echo "POSTed data: '".$_POST['data']."'";
63.                  * ?>*/
64.                 rQueue.queueRequest("http://www.anddev.org/postresponse.php", "POST",
65.                                 headers, myEvH, baos, POSTbytes.length,false);
66.  
67.                 /* Wait until the request is complete.*/
68.                 rQueue.waitUntilComplete();
69.         }
70.        
71.         // ===========================================================
72.         // Worker Class
73.         // ===========================================================
74.        
75.         private class MyEventHandler implements EventHandler {
76.                 private static final int RANDOM_ID = 0x1337;
77.  
78.                 /** Will hold the data returned by the URLCall. */
79.                 ByteArrayBuffer baf = new ByteArrayBuffer(20);
80.                
81.                 /** Needed, as we want to show the results as Notifications. */
82.                 private Activity myActivity;
83.  
84.                 MyEventHandler(Activity activity) {
85.                         this.myActivity = activity;  }
86.  
87.                 public void data(byte[] bytes, int len) {
88.                         baf.append(bytes, 0, len);  }
89.  
90.                 public void endData() {
91.                         String text = new String(baf.toByteArray());
92.                         myShowNotificationAndLog("Data loaded: n" + text);  }
93.  
94.                 public void status(int arg0, int arg1, int arg2, String s) {
95.                         myShowNotificationAndLog("status [" + s + "]");  }
96.  
97.                 public void error(int i, String s) {
98.                         this.myShowNotificationAndLog("error [" + s + "]");  }
99.  
100.                 public void handleSslErrorRequest(int arg0, String arg1, SslCertificate arg2) { }
101.                 public void headers(Iterator arg0) { }
102.                 public void headers(Headers arg0) { }
103.  
104.                 private void myShowNotificationAndLog(String msg) {
105.                         /* Print msg to LogCat and show Notification. */
106.                         Log.d(DEBUG_TAG, msg);
107.                         NotificationManager nm = (NotificationManager) this.myActivity
108.                                         .getSystemService(Activity.NOTIFICATION_SERVICE);
109.                         nm.notifyWithText(RANDOM_ID, msg, NotificationManager.LENGTH_LONG, null);
110.                 }
111.         }
112. }

Parsed in 0.051 seconds, using GeSHi 1.0.8.4

Regards,
plusminus

plusminus wrote:

Doing HTTP Post with Android

What you will learn: You will learn how to do HTTP Post from within Android.

Problems/Questions: Write them right below...

Difficulty: 2 of 5

What it will look like:

Description:
0.) HTTP is a request-response protocol. Various types of requests are possible, each identified by a different HTTP method. Her we will use the POST-Method.

1.) So we will once again start, where all Activities start. We will do some simple preparation first:

Syntax: [ Download ] [ Hide ]

Syntax: [ Download ] [ Show ]

Using java Syntax Highlighting

1.         @Override
2.         public void onCreate(Bundle icicle) {
3.                 super.onCreate(icicle);
4.  
5.                 /* Create a new HTTP-RequestQueue. */
6.                 android.net.http.RequestQueue rQueue = new RequestQueue(this);
7.                
8.                 /* Prepare the Post-Text we are going to send. */
9.                 String POSTText = null;
10.                 try {
11.                         POSTText = "mydata=" + URLEncoder.encode("HELLO, ANDROID HTTPPostExample - by anddev.org", "UTF-8");
12.                 } catch (UnsupportedEncodingException e) {
13.                         return;
14.                 }
15.                 /* And put the encoded bytes into an BAIS,
16.                  * where a function later can READ bytes from. */
17.                 byte[] POSTbytes = POSTText.getBytes();
18.                 ByteArrayInputStream baos = new ByteArrayInputStream(POSTbytes);

Parsed in 0.038 seconds, using GeSHi 1.0.8.4

2.) Preparation is done now, now we will do the interesting stuff:

Syntax: [ Download ] [ Hide ]

Syntax: [ Download ] [ Show ]

Using java Syntax Highlighting

1.                 /* Create a header-hashmap */
2.                 Map<String, String> headers = new HashMap<String, String>();
3.                 /* and put the Default-Encoding for html-forms to it. */
4.                 headers.put("Content-Type", "application/x-www-form-urlencoded");
5.                
6.                 /* Create a new EventHandler defined above, to handle what gets returned. */
7.                 MyEventHandler myEvH = new MyEventHandler(this);

Parsed in 0.036 seconds, using GeSHi 1.0.8.4

:idea: MyEventHandler is described in step 5.)

3.) I prepared a very simple php-file on my server, which will simply echo the 'mydata' variable posted to it:

Syntax: [ Download ] [ Hide ]

Syntax: [ Download ] [ Show ]

Using php Syntax Highlighting

1.                  <?php
2.                                 echo "POSTed data: '".$_POST['mydata']."'";
3.                  ?>

Parsed in 0.061 seconds, using GeSHi 1.0.8.4

4.) So we will call the queueRequest of our RequestQueue with the following parameters:

Syntax: [ Download ] [ Hide ]

Syntax: [ Download ] [ Show ]

Using java Syntax Highlighting

1. "http://www.anddev.org/postresponse.php",  // The location of the php-file
2. "POST", // The Request-'Mode'
3. headers, // The Header which tells we will have some POST-vars
4. myEvH, // our eventhandler
5. baos, // our POST-String(converted to bytes) and ready to be sent
6. POSTbytes.length, // amount of the bytes in 'baos' to be sent
7. false // dunno <img src="http://www.anddev.org/images/smilies/hmm.png" alt=":?" title="Confused" />

Parsed in 0.036 seconds, using GeSHi 1.0.8.4

So as a real implementated call it looks like this:

Syntax: [ Download ] [ Hide ]

Syntax: [ Download ] [ Show ]

Using java Syntax Highlighting

1.                 /* Calls a php-file I prepared. It looks like:
2.                  * <?php
3.                  *              echo "POSTed data: '".$_POST['data']."'";
4.                  * ?>*/
5.                 rQueue.queueRequest("http://www.anddev.org/postresponse.php", "POST",
6.                                 headers, myEvH, baos, POSTbytes.length,false);
7.  
8.                 /* Wait until the request is complete.*/
9.                 rQueue.waitUntilComplete();
10.         }

Parsed in 0.037 seconds, using GeSHi 1.0.8.4

5.) The last thing we have is a small nearly dummy-class, the MyEventHandler, which simple reacts on events that occur during the "answer" of the requested url called. There basically are just two functions that actually do something:

Syntax: [ Download ] [ Hide ]

Syntax: [ Download ] [ Show ]

Using java Syntax Highlighting

1.                 public void data(byte[] bytes, int len) {
2.                         baf.append(bytes, 0, len); // Add received data to a buffer }
3.  
4.                 public void endData() {
5.                         String text = new String(baf.toByteArray()); // Conert Buffer to String
6.                         myShowNotificationAndLog("Data loaded: n" + text); // Log what was returned }

Parsed in 0.036 seconds, using GeSHi 1.0.8.4

Thats it

The Full Source:

"/src/your_package_structure/HTTPPostExample.java"

Syntax: [ Download ] [ Hide ]

Syntax: [ Download ] [ Show ]

Using java Syntax Highlighting

1. package org.anddev.android.webstuff;
2.  
3. import java.io.ByteArrayInputStream;
4. import java.io.UnsupportedEncodingException;
5. import java.net.URLEncoder;
6. import java.util.HashMap;
7. import java.util.Iterator;
8. import java.util.Map;
9.  
10. import org.apache.http.util.ByteArrayBuffer;
11.  
12. import android.app.Activity;
13. import android.app.NotificationManager;
14. import android.net.http.EventHandler;
15. import android.net.http.Headers;
16. import android.net.http.RequestQueue;
17. import android.net.http.SslCertificate;
18. import android.os.Bundle;
19. import android.util.Log;
20.  
21. public class HTTPPostExample extends Activity {
22.  
23.         // ===========================================================
24.         // Fields
25.         // ===========================================================
26.        
27.         private final String DEBUG_TAG = "httpPostExample";
28.  
29.         // ===========================================================
30.         // 'Constructors'
31.         // ===========================================================
32.  
33.         @Override
34.         public void onCreate(Bundle icicle) {
35.                 super.onCreate(icicle);
36.  
37.                 /* Create a new HTTP-RequestQueue. */
38.                 android.net.http.RequestQueue rQueue = new RequestQueue(this);
39.                
40.                 /* Prepare the Post-Text we are going to send. */
41.                 String POSTText = null;
42.                 try {
43.                         POSTText = "mydata=" + URLEncoder.encode("HELLO, ANDROID HTTPPostExample - by anddev.org", "UTF-8");
44.                 } catch (UnsupportedEncodingException e) {
45.                         return;
46.                 }
47.                 /* And put the encoded bytes into an BAIS,
48.                  * where a function later can read bytes from. */
49.                 byte[] POSTbytes = POSTText.getBytes();
50.                 ByteArrayInputStream baos = new ByteArrayInputStream(POSTbytes);
51.                
52.                 /* Create a header-hashmap */
53.                 Map<String, String> headers = new HashMap<String, String>();
54.                 /* and put the Default-Encoding for html-forms to it. */
55.                 headers.put("Content-Type", "application/x-www-form-urlencoded");
56.                
57.                 /* Create a new EventHandler defined above, to handle what gets returned. */
58.                 MyEventHandler myEvH = new MyEventHandler(this);
59.  
60.                 /* Now we call a php-file I prepared. It is exactly this:
61.                  * <?php
62.                  *              echo "POSTed data: '".$_POST['data']."'";
63.                  * ?>*/
64.                 rQueue.queueRequest("http://www.anddev.org/postresponse.php", "POST",
65.                                 headers, myEvH, baos, POSTbytes.length,false);
66.  
67.                 /* Wait until the request is complete.*/
68.                 rQueue.waitUntilComplete();
69.         }
70.        
71.         // ===========================================================
72.         // Worker Class
73.         // ===========================================================
74.        
75.         private class MyEventHandler implements EventHandler {
76.                 private static final int RANDOM_ID = 0x1337;
77.  
78.                 /** Will hold the data returned by the URLCall. */
79.                 ByteArrayBuffer baf = new ByteArrayBuffer(20);
80.                
81.                 /** Needed, as we want to show the results as Notifications. */
82.                 private Activity myActivity;
83.  
84.                 MyEventHandler(Activity activity) {
85.                         this.myActivity = activity;  }
86.  
87.                 public void data(byte[] bytes, int len) {
88.                         baf.append(bytes, 0, len);  }
89.  
90.                 public void endData() {
91.                         String text = new String(baf.toByteArray());
92.                         myShowNotificationAndLog("Data loaded: n" + text);  }
93.  
94.                 public void status(int arg0, int arg1, int arg2, String s) {
95.                         myShowNotificationAndLog("status [" + s + "]");  }
96.  
97.                 public void error(int i, String s) {
98.                         this.myShowNotificationAndLog("error [" + s + "]");  }
99.  
100.                 public void handleSslErrorRequest(int arg0, String arg1, SslCertificate arg2) { }
101.                 public void headers(Iterator arg0) { }
102.                 public void headers(Headers arg0) { }
103.  
104.                 private void myShowNotificationAndLog(String msg) {
105.                         /* Print msg to LogCat and show Notification. */
106.                         Log.d(DEBUG_TAG, msg);
107.                         NotificationManager nm = (NotificationManager) this.myActivity
108.                                         .getSystemService(Activity.NOTIFICATION_SERVICE);
109.                         nm.notifyWithText(RANDOM_ID, msg, NotificationManager.LENGTH_LONG, null);
110.                 }
111.         }
112. }

Parsed in 0.051 seconds, using GeSHi 1.0.8.4

Regards,
plusminus