I'm trying to make a gallery of images taken from a PHP server for display in my Android application.
I made a listView to display all images via bitmap, I've also created a class "image" with the corresponding adapter to transform images. I used JSON as an identifier for the exchange of information between PHP and android. In this way I retrieve the image in base64 webservice and then the data is decoded and converted to a Bitmap that is stored in an attribute of my application (in addition I have my corresponding file "images.php" that allows me access to those images).
My problem is that the application doesn't display anything at all, then I don't know if it is my code problem or you should try another way to get a gallery display server taking pictures.
Here it's my code:
MainActivity.java
package com.example.servidorphpuca;
import android.app.Activity;
import android.os.Bundle;
import java.util.ArrayList;
import android.view.Menu;
import android.widget.ListView;
public class Tercero extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tercero);
ListView lvImages = (ListView) findViewById(R.id.lv_images);
ArrayList<Imagen> imagesAvaiable = new ArrayList<Imagen>();
//MY SECUNDARY THREAD
MiThread hilo= new MiThread(imagesAvaiable);
hilo.start();
// create the object Adapterimagen and assign it to the ListView
Adapterimagen imageAdapter = new Adapterimagen(this, imagesAvaiable);
lvImages.setAdapter(imageAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.tercero, menu);
return true;
}
}
I put a secondary thread to not overload the application:
package com.example.servidorphpuca;
import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; //import java.net.URL; import java.util.ArrayList;
import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.entity.BufferedHttpEntity; import org.apache.http.impl.client.DefaultHttpClient; import org.json.JSONArray; import org.json.JSONObject;
class MiThread extends Thread {
private ArrayList<Imagen> imagesAvaiable;
public MiThread(ArrayList<Imagen> imagesAvaiable2) { this.imagesAvaiable= imagesAvaiable2; }
@Override
public void run() {
try {
HttpGet httpGet = new HttpGet("http://www.webcompany.es/uca/images.php");
HttpClient httpClient = new DefaultHttpClient();
HttpResponse response = (HttpResponse)httpClient.execute(httpGet);
HttpEntity entity = response.getEntity();
BufferedHttpEntity buffer = new BufferedHttpEntity(entity);
InputStream iStream = buffer.getContent();
String aux = "";
BufferedReader r = new BufferedReader(new InputStreamReader(iStream));
String line;
while ((line = r.readLine()) != null) {
aux += line;
}
// Parser the response obtained from the server to a JSON object
JSONObject jsonObject = new JSONObject(aux);
JSONArray images = jsonObject.getJSONArray("images");
// travel the array with images elements
for(int i = 0; i < images.length(); i++) {
JSONObject img1 = images.getJSONObject(i);
// created the object image
Imagen c = new Imagen(img1.getInt("clave_id"));
c.setData(img1.getString("ruta_imagen"));
// store the object in the array we created above
imagesAvaiable.add(c);
}
}
catch(Exception e)
{
Log.e("WebService", e.getMessage());
}
}
}
My image class:
package com.example.servidorphpuca;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Base64;
public class Imagen {
protected long clave_id;
protected String data;
protected Bitmap ruta_imagen;
public Imagen(long clave_id) {
this.clave_id = clave_id;
}
public long getId() {
return clave_id;
}
public void setId(int clave_id) {
this.clave_id = clave_id;
}
public String getData() {
return data;
}
public void setData(String data) {
this.data = data;
try {
byte[] byteData = Base64.decode(data, Base64.DEFAULT);
this.ruta_imagen = BitmapFactory.decodeByteArray( byteData, 0, byteData.length);
}
catch(Exception e) {
e.printStackTrace();
}
}
public Bitmap getPhoto() {
return ruta_imagen;
}
}
I created another class called AdapterImage to make "adapter" to the ListView:
package com.example.servidorphpuca;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
public class Adapterimagen extends BaseAdapter {
protected Activity activity;
protected ArrayList<Imagen> items;
public Adapterimagen(Activity activity, ArrayList<Imagen> items) {
this.activity = activity;
this.items = items;
}
@Override
public int getCount() {
return items.size();
}
@Override
public Object getItem(int position) {
return items.get(position);
}
@Override
public long getItemId(int position) {
return items.get(position).getId();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View vi=convertView;
if(convertView == null) {
LayoutInflater inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
vi = inflater.inflate(R.layout.list_item_layout, null);
}
Imagen img1 = items.get(position);
ImageView image = (ImageView) vi.findViewById(R.id.imagenImage);
image.setImageBitmap(img1.getPhoto());
return vi;
}
}
And the PHP code:
<?php
$con = mysqli_connect('-----------', '-------', '--------', '-------');
mysql_query("SET CHARACTER SET utf8");
mysql_query("SET NAMES utf8");
$images['images'] = array();
if( $con )
{
mysql_select_db('images');
$res = mysql_query('select clave_id, ruta_imagen from images');
while( $row = mysql_fetch_array($res) ) {
array_push($images['images'], array('clave_id' => $row['clave_id'], 'ruta_imagen' => base64_encode($row['ruta_imagen'])));
}
mysql_free_result($res);
mysql_close($con);
}
header('Content-type: application/json');
echo json_encode($images);
?>
I found many tutorials how to do it with a single image (or even from memory or SD card), but the problem is that I want to do with a set of images from a server (no fixed number of images).
