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This document provides an overview of basic HTTP requests and communications in Meme IDE projects. It describes setting up a server entry, example request and response data, using the fetch command to make requests, and includes boilerplate code for a successful response function that checks the status and payload of the response.
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Can someone who is familiar with Android Studio help me create (in Java) a code in an app page
that lets the user upload any picture and saves it into the app after its uploaded.
Can you please post the Java code, XML code, and screenshots if possible?
Solution
AndroidManifest.xml
-----
---------
activity_upload_to_server.xml
----------------
---------------------
Upload.java
---------------------
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class Upload extends Activity {
TextView messageText;
Button uploadButton;
int serverResponseCode = 0;
ProgressDialog dialog = null;
String upLoadServerUri = null;
/********** File Path *************/
final String uploadFilePath = \"/mnt/sdcard/\";
final String uploadFileName = \"123.png\";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_upload_to_server);
uploadButton = (Button)findViewById(R.id.uploadButton);
messageText = (TextView)findViewById(R.id.messageText);
messageText.setText(\"Uploading file path :- \'/mnt/sdcard/\"+uploadFileName+\"\'\");
/************* Php script path ****************/
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@Override
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public void run() {
runOnUiThread(new Runnable() {
public void run() {
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});
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}
}).start();
}
});
}
public int uploadFile(String sourceFileUri) {
String fileName = sourceFileUri;
HttpURLConnection conn = null;
DataOutputStream dos = null;
String lineEnd = \"\ \ \";
String twoHyphens = \"--\";
String boundary = \"*****\";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
File sourceFile = new File(sourceFileUri);
if (!sourceFile.isFile()) {
dialog.dismiss();
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+uploadFilePath + \"\" + uploadFileName);
runOnUiThread(new Runnable() {
public void run() {
messageText.setText(\"Source File not exist :\"
+uploadFilePath + \"\" + uploadFileName);
}
});
return 0;
}
else
{
try {
// open a URL connection to the Servlet
FileInputStream fileInputStream = new FileInputStream(sourceFile);
URL url = new URL(upLoadServerUri);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
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05 communications
- 1. Basic Communications ● HTTP Requests ● Posting of data ● Simple Example App
- 2. Download CommsTest Project ● This presentation is accompanies by an example Meme IDE project that can be downloaded from: ● http://www.memeapps.com/tutorials//commsprojectpage.php
- 3. Define a Server Entry ● Project properties ● Servers tab – Server name. Used in functions – Address. Server address without protocol – Protocol. HTTP or HTTPS – Minimum Connection
- 4. Server Entry for Example Project
- 5. demo.memeide.com ● Example data for sample projects ● fetch_test.xml <Person fname="Andrew" sname="Whitmore"> </Person>
- 7. Form
- 8. Single Button ● Click and it runs the function: ● SendRequest function sendRequest() { fetch("TestServer", "fetch_test.xml", "Person", "successfulResponse"); }
- 9. The 'fetch' command ● Fetch ● Server name - “TestServer” ● Path - “fetch_test.xml” ● Record Type - “Person” ● Response Callback – “successfulResponse” – Called when request complete – Not written yet – Up next ......
- 10. SuccessfulResponse function function successfulResponse(response : Response) { var result : Person; var status = response.status; if (status == 200) { result = response.payload; notify("Got a person, fname=" + result.fname); } else { notify("Error, status=" + status); } } Mandatory Parameter of type Response
- 11. 'Response' Record Type ● Built-in ● Attributes ● Status – response code (200 for success) ● Payload – a record in this case a 'Person' ● Message – any error message
- 12. SuccessfulResponse function function successfulResponse(response : Response) { var result : Person; Test the status for 200 var status = response.status; if (status == 200) { Display the name attribute result = response.payload; notify("Got a person, fname=" + result.fname); } else { notify("Error, status=" + status); } If there is an error, } display the status code
- 13. Boilerplate code ● Startup function ● open(“MainForm”);
- 14. The App