I am building an apache2 server that recieves images from an android device and saves them. The server is on ubuntu, and run a PHP script that saves the images, but it doesn't seem to work. in The apache access log, there are no accesses from the device, so I guess the problem is in the app I wrote. Application code:
package com.example.t8361423.myclientapplication;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Base64;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
public class MainActivity extends AppCompatActivity {
ProgressDialog pDialog;
String image;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pDialog = new ProgressDialog(this);
Button btn_upload = (Button) findViewById(R.id.btn_upload);
btn_upload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 0);
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (data != null && requestCode == 0) {
if (resultCode == RESULT_OK) {
Uri targetUri = data.getData();
Bitmap bitmap;
try {
bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(targetUri));
Bitmap resizedBitmap = Bitmap.createScaledBitmap(bitmap, 500, 500, false);
image = ConvertBitmapToString(resizedBitmap);
Upload();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
//method to convert the selected image to base64 encoded string
public static String ConvertBitmapToString(Bitmap bitmap){
String encodedImage = "";
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream);
try {
encodedImage= URLEncoder.encode(Base64.encodeToString(byteArrayOutputStream.toByteArray(), Base64.DEFAULT), "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return encodedImage;
}
private void Upload() {
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
new UploadFile().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, "http://35.198.163.40/hello.php");
} else {
new UploadFile().execute("http://35.198.163.40/hello.php");
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private class UploadFile extends AsyncTask<String, Void, Void> {
private String Content;
private String Error = null;
String data = "";
private BufferedReader reader;
protected void onPreExecute() {
pDialog.show();
try {
data += "&" + URLEncoder.encode("image", "UTF-8") + "=" + "data:image/png;base64," + image;
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
protected Void doInBackground(String... urls) {
HttpURLConnection connection = null;
try {
URL url = new URL(urls[0]);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("POST");
con.setUseCaches(false);
con.setDoInput(true);
con.setDoOutput(true);
con.setRequestProperty("Content-Length", "" + data.getBytes().length);
con.setRequestProperty("Connection", "Keep-Alive");
con.setDoOutput(true);
OutputStream os = con.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
//make request
writer.write(data);
writer.flush();
writer.close();
reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
Content = sb.toString();
} catch (Exception ex) {
Error = ex.getMessage();
}
return null;
}
protected void onPostExecute(Void unused) {
// NOTE: You can call UI Element here.
pDialog.dismiss();
try {
if (Content != null) {
JSONObject jsonResponse = new JSONObject(Content);
String status = jsonResponse.getString("status");
if ("200".equals(status)) {
Toast.makeText(getApplicationContext(), "File uploaded successfully", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "Something is wrong ! Please try again.", Toast.LENGTH_SHORT).show();
}
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
The PHP script is located is /var/www/html and this is the code:
<?php
require_once('conn/config.php');//use path and name of your connection file
$base64_string=$_POST['image'];
$image_name = uniqid().".png";
if(validateString($base64_string))
{
$data = explode(',', $base64_string);
$ifp = fopen($_SERVER['DOCUMENT_ROOT'] ."/images/".$image_name, "wb");// use your folder path
fwrite($ifp, base64_decode($data[1]));
fclose($ifp);
//inserting the picture name to your table , here i am just inserting pic name, you can insert
//other details also
$query = "INSERT INTO your_table(pic) VALUES (?)";
$stmt = $con->prepare($query);
$stmt->bind_param("s",$image_name);
$stmt->execute();
$id=$stmt->insert_id;
if($stmt->affected_rows==1){
$final_arr=array();
$final_arr["status"] = "200";
$final_arr["msg"] = "successful";
print_r(json_encode($final_arr));
}else{
$final_arr=array();
$final_arr["status"] = "401";
$final_arr["msg"] = "Not successful";
print_r(json_encode($final_arr));
}
}
else
{
$final_arr=array();
$final_arr["status"] = "501";
$final_arr["msg"] = "Unsccessfull";
print_r(json_encode($final_arr));
}
//function to validate base64 string
function validateString($string)
{
$data = explode(',', $string);
if(count($data) >= 2)
{
$format = explode('/', $data[0]);
if($format[0] == 'data:image')
{
return true;
}
}
return false;
}
?>
However, when setting up an http server using python, I managed to send and recieve the http POST, so I believe the problem is on the server side. Can anyone tell what I'm doing wrong, and how to fix it?
can you test your url from postman api? if you get any error from postman then there is a problem with your api/url/server. Another thing try to upload image with retrofit. its easy and simple