Java HttpURLConnection


 

Java

package com.bogotobogo.httpconnecta;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class HttpURLConnectionA extends Activity {

private ProgressDialog progressDialog;
private Bitmap bitmap = null;
private String text = null;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

Button imageBtn = (Button)findViewById(R.id.Button01);
Button textBtn = (Button)findViewById(R.id.Button02);

imageBtn.setOnClickListener( new OnClickListener() {
public void onClick(View v) {
downloadImage(“http://www.bogotobogo.com/images/smalltiger.gif”);
}
});

textBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
downloadText(“http://www.bogotobogo.com/android.html”);
}
});
}

private void downloadImage(String urlStr) {
progressDialog = ProgressDialog.show(this, “”,
“Downloading Image from ” + urlStr);
final String url = urlStr;

new Thread() {
public void run() {
InputStream in = null;
Message msg = Message.obtain();
msg.what = 1;
try {
in = openHttpConnection(url);
bitmap = BitmapFactory.decodeStream(in);
Bundle b = new Bundle();
b.putParcelable(“bitmap”, bitmap);
msg.setData(b);
in.close();
} catch (IOException e1) {
e1.printStackTrace();
}
messageHandler.sendMessage(msg);
}
}.start();
}

private void downloadText(String urlStr) {
progressDialog = ProgressDialog.show(this, “”,
“Download Text from ” + urlStr);
final String url = urlStr;

new Thread () {
public void run() {
int BUFFER_SIZE = 2000;
InputStream in = null;
Message msg = Message.obtain();
msg.what=2;
try {
in = openHttpConnection(url);

InputStreamReader isr = new InputStreamReader(in);
int charRead;
text = “”;
char[] inputBuffer = new char[BUFFER_SIZE];

while ((charRead = isr.read(inputBuffer))>0)
{
String readString =
String.copyValueOf(inputBuffer, 0, charRead);
text += readString;
inputBuffer = new char[BUFFER_SIZE];
}
Bundle b = new Bundle();
b.putString(“text”, text);
msg.setData(b);
in.close();

}catch (IOException e2) {
e2.printStackTrace();
}
messageHandler.sendMessage(msg);
}
}.start();
}

private InputStream openHttpConnection(String urlStr) {
InputStream in = null;
int resCode = -1;

try {
URL url = new URL(urlStr);
URLConnection urlConn = url.openConnection();

if (!(urlConn instanceof HttpURLConnection)) {
throw new IOException (“URL is not an Http URL”);
}

HttpURLConnection httpConn = (HttpURLConnection)urlConn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod(“GET”);
httpConn.connect();

resCode = httpConn.getResponseCode();
if (resCode == HttpURLConnection.HTTP_OK) {
in = httpConn.getInputStream();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return in;
}

private Handler messageHandler = new Handler() {

public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case 1:
ImageView img = (ImageView) findViewById(R.id.imageview01);
img.setImageBitmap((Bitmap)(msg.getData().getParcelable(“bitmap”)));
break;
case 2:
TextView text = (TextView) findViewById(R.id.textview01);
text.setText(msg.getData().getString(“text”));
break;
}
progressDialog.dismiss();
}
};
}

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