現在、Youtube ビデオへのリンクを表示するリスト ビューを含む Android アプリを開発しています。アプリケーションは、JSON としてサーバーからデータを取得します。現在、このサブドメインからこれらのビデオのサムネイルを表示しようとしています - http://img.youtube.com/vi/.
しかし、画像はリスト ビューに表示されません。
プロジェクトのコードは次のとおりです。
1 - canticlesActivity.java
package com.shadatv.shada;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
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.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
public class canticlesActivity extends ListActivity {
TextView httpStuff;
HttpClient client;
JSONArray canticles;
String picpath = "http://img.youtube.com/vi/";
File sdcard = Environment.getExternalStorageDirectory();
File shadaRoot = new File(sdcard.getAbsolutePath() + "/shada_Folder");
private static final String CA_NAME = "ca_name";
private static final String CA_LINK = "ca_link";
private static final String CA_IMG = "ca_img";
private static final String URL = "http://dt-works.com/ags/shadatv/canticles/android_data";
ArrayList<HashMap<String, String>> canticlesList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.canticles);
httpStuff = (TextView) findViewById(R.id.textView1);
client = new DefaultHttpClient();
new Read().execute();
}
public JSONArray allCanticles() throws ClientProtocolException, IOException, JSONException {
StringBuilder url = new StringBuilder(URL);
HttpGet get = new HttpGet(url.toString());
HttpResponse r = client.execute(get);
int status = r.getStatusLine().getStatusCode();
if (status == 200) {
HttpEntity e = r.getEntity();
String data = EntityUtils.toString(e);
JSONArray canticles = new JSONArray(data);
return canticles;
} else {
Toast.makeText(getBaseContext(), "error", Toast.LENGTH_SHORT).show();
return null;
}
}
public void downloadImage(String fileURL) {
try {
// Toast.makeText(getBaseContext(), "baaad", Toast.LENGTH_SHORT).show();
String finlpth = "";
finlpth = picpath + fileURL + "/2.jpg";
shadaRoot.mkdirs();
URL u = new URL(finlpth);
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
File DownloadedFile = new File(shadaRoot, fileURL + ".jpg");
// if(!outfile.exists())
FileOutputStream f = new FileOutputStream(DownloadedFile);
InputStream in = c.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = in.read(buffer)) > 0) {
f.write(buffer, 0, len1);
}
f.close();
} catch (Exception e) {
Log.d("Downloader", e.getMessage());
}
}
public class Read extends AsyncTask<String, String, String>{
@Override
protected String doInBackground(String... params) {
canticlesList = new ArrayList<HashMap<String, String>>();
try {
canticles = allCanticles();
for (int i = 0; i < canticles.length(); i++) {
JSONObject canticle = canticles.getJSONObject(i);
String ca_name = canticle.getString(CA_NAME);
String ca_link = canticle.getString(CA_LINK);
downloadImage(ca_link);
HashMap<String, String> map = new HashMap<String, String>();
map.put(CA_NAME, ca_name);
map.put(CA_LINK, ca_link);
map.put(CA_IMG, ca_link + ".jpg");
canticlesList.add(map);
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
ListAdapter adapter = new SimpleAdapter(canticlesActivity.this,
canticlesList,R.layout.list_item,
new String[] {CA_NAME, CA_LINK, CA_IMG},
new int[] {R.id.ca_name, R.id.ca_link, R.id.ca_img});
setListAdapter(adapter);
}
}
}
2 - list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/list_selector"
android:orientation="horizontal" >
<!-- Product id (pid) - will be HIDDEN - used to pass to other activity -->
<ImageView
android:id="@+id/ca_img"
android:layout_width="50dip"
android:layout_height="50dip"
android:contentDescription="@string/desc"
/>
<TextView
android:id="@+id/ca_name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<!-- Name Label -->
<TextView
android:id="@+id/ca_link"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingTop="6dip"
android:paddingLeft="6dip"
android:textSize="17sp"
android:textStyle="bold"
android:visibility="gone" />
</LinearLayout>