How to retrieve a photo from HttpClient? - php

Question

I am using HttpClient to make a request from my Android device to a simple HTTP server, which contains a PHP script to retrieve a picture. The picture is available inside a blob data. It means if I do this little PHP code in the server side:
file_put_contents("myPicture.png", $blob_data);
I get the picture saved in the server with a file named myPicture.png. Now I want to get this $blob_data (my picture) to save it inside my Android device, not the HTTP server. Someone can give me a hint to return the blob data from the PHP script and get the picture inside the Android device to store it locally?
Here is my HTTPClient:
#Click(R.id.btn_login)
#Background
public void LoginTrigger(){
String nUsername = username.getText().toString().trim();
String nPassword = password.getText().toString().trim();
if (nUsername.matches("") || nPassword.matches("")){
displayToast("Please insert your login!");
}
else{
List<NameValuePair> urlParameters = new ArrayList<NameValuePair>();
urlParameters.add(new BasicNameValuePair("username", nUsername));
urlParameters.add(new BasicNameValuePair("password", nPassword));
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(SERVER_PROXY);
post.setHeader("User-Agent", SERVER_USER_AGENT);
try{
post.setEntity(new UrlEncodedFormEntity(urlParameters, "utf-8"));
}
catch(Exception e){
Log.getStackTraceString(e);
}
HttpResponse response = null;
try{
response = client.execute(post);
Log.e("Response Code : ", " = " + response.getStatusLine().getReasonPhrase());
InputStream inputStream = response.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
inputStream.close();
String responseMessage = sb.toString();
checkLogin(responseMessage);
}
catch(Exception e){
Log.e("HTTP-ERROR", " = " + Log.getStackTraceString(e));
displayToast("Check your Internet connection!");
}
}
}
String responseMessage contains my blob data when I echo it in my PHP script. I just need to put this stream inside a Bitmap or something, but I've no clue about how to get it done.
Thanks if you know it!

Answer 1

php code (server)
<?php
header('Content-Type: image/png');
echo($blob_data);
?>
java code (device)
URL url = new URL ("http://myserver.com/myPicture.png");
InputStream input = url.openStream();
try {
//The sdcard directory e.g. '/sdcard' can be used directly, or
//more safely abstracted with getExternalStorageDirectory()
File storagePath = Environment.getExternalStorageDirectory();
OutputStream output = new FileOutputStream (new File(storagePath,"myPicture.png"));
try {
byte[] buffer = new byte[aReasonableSize];
int bytesRead = 0;
while ((bytesRead = input.read(buffer, 0, buffer.length)) >= 0) {
output.write(buffer, 0, bytesRead);
}
} finally {
output.close();
}
} finally {
input.close();
}
Manifest
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Answer 2

You need to change both the client and the server code.
The server code
Add this at the end of your PHP script
header("Content-Type: image/png");
header("Content-Length: " . mb_strlen($blob_data, '8bit'));
echo $blob_data;
exit;
The client code
Your code is not ready to read binary data, please, check out this other question on how to do it: how to download image from any web page in java

Answer 3

it's not recommended to send the actual file to your android app , the best way to do that is by sending a base 64 encoded a link string of the image , which will have all the meta data of the image , then load the image from base46 encoded string
$image = base64_decode($file_path);
return response::json(array('image'=>$image);
and receive it like object and render your image with the base64code image like this
i do it in js like this
var reader = new FileReader();
reader.onload = function(e) {
image_base64 = e.target.result;
preview.html("<img src='" + image_base64 + "'/>");
};
reader.readAsDataURL(file);