Url request in Android

In this article i will show you how to send ‘url request’ in android.

We need 4 file here :
1) MainActivity.java
2) MyTask.java
3) AsyncTaskCompleteListener.java
4) Utils.java



Let’s make it !

1) MainActivity.java

Update MainActivity.java with the following script :

package com.moko.Webservice; // change with your package
import android.os.Bundle;
import android.app.Activity;
import android.widget.Toast;

public class MainActivity extends Activity implements AsyncTaskCompleteListener{

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		//http request
		new MyTask(this).execute("http://ambar-hasbiyatmoko.com/download.php?versi=2");
		
	}
	
	// http response
	public void onTaskComplete(String result) {
		Toast.makeText(getApplicationContext(), "result : " + result, Toast.LENGTH_LONG).show();
	}
	
}

change http://ambar-hasbiyatmoko.com/download.php?versi=2 with your url.

2) MyTask.java

This class used to waiting the url request until completed.

package com.moko.Webservice; // change with your package
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;

public class MyTask extends AsyncTask<String, Void, String> {

	private Activity activity;
	private ProgressDialog dialog;
	private AsyncTaskCompleteListener callback;

	public MyTask(Activity act) {
		this.activity = act;
		this.callback = (AsyncTaskCompleteListener)act;
	}

	@Override
	protected void onPreExecute() {
		super.onPreExecute();

		dialog = new ProgressDialog(activity);
		dialog.setMessage("Loading...");
		dialog.show();
	}

	@Override
	protected String doInBackground(String... params) {
		return Utils.getJSONString(params[0]);
	}

	@Override
	protected void onPostExecute(String result) {
		super.onPostExecute(result);
		if (null != dialog && dialog.isShowing()) {
			dialog.dismiss();
		}
		callback.onTaskComplete(result);
	}
}

3) AsyncTaskCompleteListener.java

package com.moko.Webservice; // change with your package
interface AsyncTaskCompleteListener {
	public void onTaskComplete(String result);
}

4) Utils.java

package com.moko.Webservice; // change with your package

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class Utils {
	public static String getJSONString(String url) {
		String result = null;
		HttpURLConnection linkConnection = null;
		try {
			URL linkurl = new URL(url);
			linkConnection = (HttpURLConnection) linkurl.openConnection();
			int responseCode = linkConnection.getResponseCode();
			if (responseCode == HttpURLConnection.HTTP_OK) {
				InputStream linkinStream = linkConnection.getInputStream();
				ByteArrayOutputStream baos = new ByteArrayOutputStream();
				int j = 0;
				while ((j = linkinStream.read()) != -1) {
					baos.write(j);
				}
				byte[] data = baos.toByteArray();
				result = new String(data);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (linkConnection != null) {
				linkConnection.disconnect();
			}
		}
		return result;
	}
}

CONFIGURE ANDROIDMANiFEST.XML

The last, you must add the following script to allow internet connection in your app :

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

TEST APP

FINISH!!