Je voulais savoir quelle est la meilleure façon de télécharger une image sur le serveur sans perdre sa qualité. J'ai recherché sur Google trouvé diverses méthodes de publication de données. Mais je ne sais pas lequel serait le mieux à télécharger. Je suis tombé sur
- Téléchargement d'images en plusieurs parties.
- Téléchargement d'images à l'aide d'un tableau d'octets
- Téléchargement d'images à l'aide d'une chaîne encodée en base64.
J'ai essayé l'encodage Base64, cela me conduit à OOM (Out of memory) si l'image est trop haute en résolution. Tout tutoriel abordant ce problème serait apprécié. Merci d'avance.
Réponses:
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK); photoPickerIntent.setType("image/*"); startActivityForResult(photoPickerIntent, 1);
CODE CI-DESSUS POUR SÉLECTIONNER UNE IMAGE DANS LA GALERIE
@Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == 1) if (resultCode == Activity.RESULT_OK) { Uri selectedImage = data.getData(); String filePath = getPath(selectedImage); String file_extn = filePath.substring(filePath.lastIndexOf(".") + 1); image_name_tv.setText(filePath); try { if (file_extn.equals("img") || file_extn.equals("jpg") || file_extn.equals("jpeg") || file_extn.equals("gif") || file_extn.equals("png")) { //FINE } else { //NOT IN REQUIRED FORMAT } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public String getPath(Uri uri) { String[] projection = {MediaColumns.DATA}; Cursor cursor = managedQuery(uri, projection, null, null, null); column_index = cursor .getColumnIndexOrThrow(MediaColumns.DATA); cursor.moveToFirst(); imagePath = cursor.getString(column_index); return cursor.getString(column_index); }
POSTEZ MAINTENANT LES DONNÉES À L'AIDE DES DONNÉES DE FORMULAIRE MULTIPART
HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost("LINK TO SERVER");
Données de formulaire en plusieurs parties
MultipartEntity mpEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE); if (filePath != null) { File file = new File(filePath); Log.d("EDIT USER PROFILE", "UPLOAD: file length = " + file.length()); Log.d("EDIT USER PROFILE", "UPLOAD: file exist = " + file.exists()); mpEntity.addPart("avatar", new FileBody(file, "application/octet")); }
FINALEMENT POSTER LES DONNÉES SUR LE SERVEUR
httppost.setEntity(mpEntity); HttpResponse response = httpclient.execute(httppost);
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Classe d'activité principale à choisir et à télécharger
import android.app.Activity; import android.app.ProgressDialog; import android.content.Intent; import android.content.pm.PackageManager; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.provider.MediaStore; //import android.util.Base64; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; import java.io.ByteArrayOutputStream; import java.util.ArrayList; public class MainActivity extends Activity { Button btpic, btnup; private Uri fileUri; String picturePath; Uri selectedImage; Bitmap photo; String ba1; public static String URL = "Paste your URL here"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btpic = (Button) findViewById(R.id.cpic); btpic.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { clickpic(); } }); btnup = (Button) findViewById(R.id.up); btnup.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { upload(); } }); } private void upload() { // Image location URL Log.e("path", "----------------" + picturePath); // Image Bitmap bm = BitmapFactory.decodeFile(picturePath); ByteArrayOutputStream bao = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.JPEG, 90, bao); byte[] ba = bao.toByteArray(); //ba1 = Base64.encodeBytes(ba); Log.e("base64", "-----" + ba1); // Upload image to server new uploadToServer().execute(); } private void clickpic() { // Check Camera if (getApplicationContext().getPackageManager().hasSystemFeature( PackageManager.FEATURE_CAMERA)) { // Open default camera Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); // start the image capture Intent startActivityForResult(intent, 100); } else { Toast.makeText(getApplication(), "Camera not supported", Toast.LENGTH_LONG).show(); } } protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == 100 && resultCode == RESULT_OK) { selectedImage = data.getData(); photo = (Bitmap) data.getExtras().get("data"); // Cursor to get image uri to display String[] filePathColumn = {MediaStore.Images.Media.DATA}; Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null); cursor.moveToFirst(); int columnIndex = cursor.getColumnIndex(filePathColumn[0]); picturePath = cursor.getString(columnIndex); cursor.close(); Bitmap photo = (Bitmap) data.getExtras().get("data"); ImageView imageView = (ImageView) findViewById(R.id.Imageprev); imageView.setImageBitmap(photo); } } public class uploadToServer extends AsyncTask<Void, Void, String> { private ProgressDialog pd = new ProgressDialog(MainActivity.this); protected void onPreExecute() { super.onPreExecute(); pd.setMessage("Wait image uploading!"); pd.show(); } @Override protected String doInBackground(Void... params) { ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); nameValuePairs.add(new BasicNameValuePair("base64", ba1)); nameValuePairs.add(new BasicNameValuePair("ImageName", System.currentTimeMillis() + ".jpg")); try { HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost(URL); httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); HttpResponse response = httpclient.execute(httppost); String st = EntityUtils.toString(response.getEntity()); Log.v("log_tag", "In the try Loop" + st); } catch (Exception e) { Log.v("log_tag", "Error in http connection " + e.toString()); } return "Success"; } protected void onPostExecute(String result) { super.onPostExecute(result); pd.hide(); pd.dismiss(); } } }
code php pour gérer l'image de téléchargement et également créer une image à partir de données encodées en base64
<?php error_reporting(E_ALL); if(isset($_POST['ImageName'])){ $imgname = $_POST['ImageName']; $imsrc = base64_decode($_POST['base64']); $fp = fopen($imgname, 'w'); fwrite($fp, $imsrc); if(fclose($fp)){ echo "Image uploaded"; }else{ echo "Error uploading image"; } } ?>
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utilisez le code ci-dessous, cela vous aide ...
BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = 4; options.inPurgeable = true; Bitmap bm = BitmapFactory.decodeFile("your path of image",options); ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.JPEG,40,baos); // bitmap object byteImage_photo = baos.toByteArray(); //generate base64 string of image String encodedImage =Base64.encodeToString(byteImage_photo,Base64.DEFAULT); //send this encoded string to server
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Essayez cette méthode pour télécharger un fichier image depuis l'appareil photo
package com.example.imageupload; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import org.apache.http.Header; import org.apache.http.HttpEntity; import org.apache.http.message.BasicHeader; public class MultipartEntity implements HttpEntity { private String boundary = null; ByteArrayOutputStream out = new ByteArrayOutputStream(); boolean isSetLast = false; boolean isSetFirst = false; public MultipartEntity() { this.boundary = System.currentTimeMillis() + ""; } public void writeFirstBoundaryIfNeeds() { if (!isSetFirst) { try { out.write(("--" + boundary + "\r\n").getBytes()); } catch (final IOException e) { } } isSetFirst = true; } public void writeLastBoundaryIfNeeds() { if (isSetLast) { return; } try { out.write(("\r\n--" + boundary + "--\r\n").getBytes()); } catch (final IOException e) { } isSetLast = true; } public void addPart(final String key, final String value) { writeFirstBoundaryIfNeeds(); try { out.write(("Content-Disposition: form-data; name=\"" + key + "\"\r\n") .getBytes()); out.write("Content-Type: text/plain; charset=UTF-8\r\n".getBytes()); out.write("Content-Transfer-Encoding: 8bit\r\n\r\n".getBytes()); out.write(value.getBytes()); out.write(("\r\n--" + boundary + "\r\n").getBytes()); } catch (final IOException e) { } } public void addPart(final String key, final String fileName, final InputStream fin) { addPart(key, fileName, fin, "application/octet-stream"); } public void addPart(final String key, final String fileName, final InputStream fin, String type) { writeFirstBoundaryIfNeeds(); try { type = "Content-Type: " + type + "\r\n"; out.write(("Content-Disposition: form-data; name=\"" + key + "\"; filename=\"" + fileName + "\"\r\n").getBytes()); out.write(type.getBytes()); out.write("Content-Transfer-Encoding: binary\r\n\r\n".getBytes()); final byte[] tmp = new byte[4096]; int l = 0; while ((l = fin.read(tmp)) != -1) { out.write(tmp, 0, l); } out.flush(); } catch (final IOException e) { } finally { try { fin.close(); } catch (final IOException e) { } } } public void addPart(final String key, final File value) { try { addPart(key, value.getName(), new FileInputStream(value)); } catch (final FileNotFoundException e) { } } public long getContentLength() { writeLastBoundaryIfNeeds(); return out.toByteArray().length; } public Header getContentType() { return new BasicHeader("Content-Type", "multipart/form-data; boundary=" + boundary); } public boolean isChunked() { return false; } public boolean isRepeatable() { return false; } public boolean isStreaming() { return false; } public void writeTo(final OutputStream outstream) throws IOException { outstream.write(out.toByteArray()); } public Header getContentEncoding() { return null; } public void consumeContent() throws IOException, UnsupportedOperationException { if (isStreaming()) { throw new UnsupportedOperationException( "Streaming entity does not implement #consumeContent()"); } } public InputStream getContent() throws IOException, UnsupportedOperationException { return new ByteArrayInputStream(out.toByteArray()); } }
Utilisation de la classe pour le téléchargement
private void doFileUpload(File file_path) { Log.d("Uri", "Do file path" + file_path); try { HttpClient client = new DefaultHttpClient(); //use your server path of php file HttpPost post = new HttpPost(ServerUploadPath); Log.d("ServerPath", "Path" + ServerUploadPath); FileBody bin1 = new FileBody(file_path); Log.d("Enter", "Filebody complete " + bin1); MultipartEntity reqEntity = new MultipartEntity(); reqEntity.addPart("uploaded_file", bin1); reqEntity.addPart("email", new StringBody(useremail)); post.setEntity(reqEntity); Log.d("Enter", "Image send complete"); HttpResponse response = client.execute(post); resEntity = response.getEntity(); Log.d("Enter", "Get Response"); try { final String response_str = EntityUtils.toString(resEntity); if (resEntity != null) { Log.i("RESPONSE", response_str); JSONObject jobj = new JSONObject(response_str); result = jobj.getString("ResponseCode"); Log.e("Result", "...." + result); } } catch (Exception ex) { Log.e("Debug", "error: " + ex.getMessage(), ex); } } catch (Exception e) { Log.e("Upload Exception", ""); e.printStackTrace(); } }
Service de téléchargement
<?php $image_name = $_FILES["uploaded_file"]["name"]; $tmp_arr = explode(".",$image_name); $img_extn = end($tmp_arr); $new_image_name = 'image_'. uniqid() .'.'.$img_extn; $flag=0; if (file_exists("Images/".$new_image_name)) { $msg=$new_image_name . " already exists." header('Content-type: application/json'); echo json_encode(array("ResponseCode"=>"2","ResponseMsg"=>$msg)); }else{ move_uploaded_file($_FILES["uploaded_file"]["tmp_name"],"Images/". $new_image_name); $flag = 1; } if($flag == 1){ require 'db.php'; $static_url =$new_image_name; $conn=mysql_connect($db_host,$db_username,$db_password) or die("unable to connect localhost".mysql_error()); $db=mysql_select_db($db_database,$conn) or die("unable to select message_app"); $email = ""; if((isset($_REQUEST['email']))) { $email = $_REQUEST['email']; } $sql ="insert into alert(images) values('$static_url')"; $result=mysql_query($sql); if($result){ echo json_encode(array("ResponseCode"=>"1","ResponseMsg"=> "Insert data successfully.","Result"=>"True","ImageName"=>$static_url,"email"=>$email)); } else { echo json_encode(array("ResponseCode"=>"2","ResponseMsg"=> "Could not insert data.","Result"=>"False","email"=>$email)); } } else{ echo json_encode(array("ResponseCode"=>"2","ResponseMsg"=> "Erroe While Inserting Image.","Result"=>"False")); } ?>
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