In this exercise, FlickrImage class have been further modified and array of FlickrImage have been implemented to hold the returned Flickr photos. 5 query per page is preset, and the photos are displayed on hardcoded ImageView(s).
package com.exercise.AndroidFlickr;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
public class AndroidFlickrActivity extends Activity {
public class FlickrImage {
String Id;
String Owner;
String Secret;
String Server;
String Farm;
String Title;
Bitmap FlickrBitmap;
FlickrImage(String _Id, String _Owner, String _Secret,
String _Server, String _Farm, String _Title){
Id = _Id;
Owner = _Owner;
Secret = _Secret;
Server = _Server;
Farm = _Farm;
Title = _Title;
FlickrBitmap = preloadBitmap();
}
private Bitmap preloadBitmap(){
Bitmap bm= null;
String FlickrPhotoPath =
"http://farm" + Farm + ".static.flickr.com/"
+ Server + "/" + Id + "_" + Secret + "_m.jpg";
URL FlickrPhotoUrl = null;
try {
FlickrPhotoUrl = new URL(FlickrPhotoPath);
HttpURLConnection httpConnection
= (HttpURLConnection) FlickrPhotoUrl.openConnection();
httpConnection.setDoInput(true);
httpConnection.connect();
InputStream inputStream = httpConnection.getInputStream();
bm = BitmapFactory.decodeStream(inputStream);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return bm;
}
public Bitmap getBitmap(){
return FlickrBitmap;
}
}
FlickrImage[] myFlickrImage;
/*
* FlickrQuery = FlickrQuery_url
* + FlickrQuery_per_page
* + FlickrQuery_nojsoncallback
* + FlickrQuery_format
* + FlickrQuery_tag + q
* + FlickrQuery_key + FlickrApiKey
*/
String FlickrQuery_url = "http://api.flickr.com/services/rest/?method=flickr.photos.search";
String FlickrQuery_per_page = "&per_page=5";
String FlickrQuery_nojsoncallback = "&nojsoncallback=1";
String FlickrQuery_format = "&format=json";
String FlickrQuery_tag = "&tags=";
String FlickrQuery_key = "&api_key=";
// Apply your Flickr API:
// www.flickr.com/services/apps/create/apply/?
String FlickrApiKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
//final String DEFAULT_SEARCH = "Bill_Gate";
final String DEFAULT_SEARCH = "new_york";
EditText searchText;
Button searchButton;
ImageView imageFlickrPhoto0, imageFlickrPhoto1,
imageFlickrPhoto2, imageFlickrPhoto3, imageFlickrPhoto4;
Bitmap bmFlickr;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
searchText = (EditText)findViewById(R.id.searchtext);
searchText.setText(DEFAULT_SEARCH);
searchButton = (Button)findViewById(R.id.searchbutton);
imageFlickrPhoto0 = (ImageView)findViewById(R.id.flickrPhoto0);
imageFlickrPhoto1 = (ImageView)findViewById(R.id.flickrPhoto1);
imageFlickrPhoto2 = (ImageView)findViewById(R.id.flickrPhoto2);
imageFlickrPhoto3 = (ImageView)findViewById(R.id.flickrPhoto3);
imageFlickrPhoto4 = (ImageView)findViewById(R.id.flickrPhoto4);
searchButton.setOnClickListener(searchButtonOnClickListener);
}
private Button.OnClickListener searchButtonOnClickListener
= new Button.OnClickListener(){
public void onClick(View arg0) {
// TODO Auto-generated method stub
String searchQ = searchText.getText().toString();
String searchResult = QueryFlickr(searchQ);
myFlickrImage = ParseJSON(searchResult);
Bitmap myFlickrImageBM;
myFlickrImageBM = myFlickrImage[0].getBitmap();
if (myFlickrImageBM != null){
imageFlickrPhoto0.setImageBitmap(myFlickrImageBM);
}
myFlickrImageBM = myFlickrImage[1].getBitmap();
if (myFlickrImageBM != null){
imageFlickrPhoto1.setImageBitmap(myFlickrImageBM);
}
myFlickrImageBM = myFlickrImage[2].getBitmap();
if (myFlickrImageBM != null){
imageFlickrPhoto2.setImageBitmap(myFlickrImageBM);
}
myFlickrImageBM = myFlickrImage[3].getBitmap();
if (myFlickrImageBM != null){
imageFlickrPhoto3.setImageBitmap(myFlickrImageBM);
}
myFlickrImageBM = myFlickrImage[4].getBitmap();
if (myFlickrImageBM != null){
imageFlickrPhoto4.setImageBitmap(myFlickrImageBM);
}
}};
private String QueryFlickr(String q){
String qResult = null;
String qString =
FlickrQuery_url
+ FlickrQuery_per_page
+ FlickrQuery_nojsoncallback
+ FlickrQuery_format
+ FlickrQuery_tag + q
+ FlickrQuery_key + FlickrApiKey;
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(qString);
try {
HttpEntity httpEntity = httpClient.execute(httpGet).getEntity();
if (httpEntity != null){
InputStream inputStream = httpEntity.getContent();
Reader in = new InputStreamReader(inputStream);
BufferedReader bufferedreader = new BufferedReader(in);
StringBuilder stringBuilder = new StringBuilder();
String stringReadLine = null;
while ((stringReadLine = bufferedreader.readLine()) != null) {
stringBuilder.append(stringReadLine + "\n");
}
qResult = stringBuilder.toString();
inputStream.close();
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return qResult;
}
private FlickrImage[] ParseJSON(String json){
FlickrImage[] flickrImage = null;
bmFlickr = null;
String flickrId;
String flickrOwner;
String flickrSecret;
String flickrServer;
String flickrFarm;
String flickrTitle;
try {
JSONObject JsonObject = new JSONObject(json);
JSONObject Json_photos = JsonObject.getJSONObject("photos");
JSONArray JsonArray_photo = Json_photos.getJSONArray("photo");
flickrImage = new FlickrImage[JsonArray_photo.length()];
for (int i = 0; i < JsonArray_photo.length(); i++){
JSONObject FlickrPhoto = JsonArray_photo.getJSONObject(i);
flickrId = FlickrPhoto.getString("id");
flickrOwner = FlickrPhoto.getString("owner");
flickrSecret = FlickrPhoto.getString("secret");
flickrServer = FlickrPhoto.getString("server");
flickrFarm = FlickrPhoto.getString("farm");
flickrTitle = FlickrPhoto.getString("title");
flickrImage[i] = new FlickrImage(flickrId, flickrOwner, flickrSecret,
flickrServer, flickrFarm, flickrTitle);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return flickrImage;
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<EditText
android:id="@+id/searchtext"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<Button
android:id="@+id/searchbutton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Search"
/>
<TextView
android:id="@+id/queryresult"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<ImageView
android:id="@+id/flickrPhoto0"
android:layout_width="fill_parent"
android:layout_height="75dp"
/>
<ImageView
android:id="@+id/flickrPhoto1"
android:layout_width="fill_parent"
android:layout_height="75dp"
/>
<ImageView
android:id="@+id/flickrPhoto2"
android:layout_width="fill_parent"
android:layout_height="75dp"
/>
<ImageView
android:id="@+id/flickrPhoto3"
android:layout_width="fill_parent"
android:layout_height="75dp"
/>
<ImageView
android:id="@+id/flickrPhoto4"
android:layout_width="fill_parent"
android:layout_height="75dp"
/>
</LinearLayout>
Modify AndroidManifest.xml to grant permission of "android.permission.INTERNET".
Download the files.next:
- Display Flickr photos in Gallery using BaseAdapter
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