Http Connect Example In Android Development

May 31, 2013 /
Android /
By Chetana

This example will show you how to use http.

Algorithm:

1.) Create a new project by File-> New -> Android Project name it HttpConnectExample.

2.) Write following into layout/main.xml:

<?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"
android:scrollbars="vertical">
<AbsoluteLayout android:id="@+id/AbsoluteLayout01"
android:layout_width="wrap_content"
android:layout_height="wrap_content">

<ImageView
android:id="@+id/imageview01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:tag="@string/imagestring"
android:cropToPadding="true" android:contentDescription="@string/imagestring" android:adjustViewBounds="true" android:layout_y="10px" android:layout_x="1px">

</ImageView>
<TextView
android:id="@+id/textview01"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/textstring" android:layout_x="1px" android:layout_y="200px"/>
<Button
android:id="@+id/Button01"
android:text="@string/button01"
android:layout_height="wrap_content"
android:layout_width="wrap_content" android:layout_x="10px" android:layout_y="325px"></Button>
<Button android:id="@+id/Button02"
android:layout_height="wrap_content"
android:text="@string/button02"
android:layout_width="wrap_content" android:layout_x="100px" android:layout_y="325px"></Button>
</AbsoluteLayout>

</LinearLayout>

3.) Write following into your manifest file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.HttpConnectExample"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".HttpConnectExample"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

</application>

<uses-permission android:name="android.permission.INTERNET"></uses-permission>
</manifest>

4.) Run for output.

Steps:

1.) Create a project named HttpConnectExample and set the information as stated in the image.

Build Target: Android 4.2
Application Name: HttpConnectExample
Package Name: com.example.HttpConnectExample
Activity Name: HttpConnectExample
Min SDK Version: 4.2

2.) Open HttpConnectExample.java file and write following code there:

package com.example.HttpConnectExample;

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 HttpConnectExample extends Activity {

private Button getImageButton;
private Button getTextButton;
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);

getImageButton = (Button)findViewById(R.id.Button01);
getTextButton = (Button)findViewById(R.id.Button02);

getImageButton.setOnClickListener( new OnClickListener() {

@Override
public void onClick(View v) {
downloadImage("http://www.android.com/media/wallpaper/gif/android_logo.gif");

}
});

getTextButton.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
downloadText("https://www.edumobile.org/android");
}
});
}

private void downloadImage(String urlStr) {
progressDialog = ProgressDialog.show(this, "", "Fetching Image...");
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, "", "Fetching Text...");
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)
{
//---convert the chars to a String---
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 e) {
e.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();
}
};
}

3.) Compile and build the project.

Output

Http Connect Example In Android Development

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