Tuesday, October 13, 2009

Android Twitter Client, post updated status to Twitter from Android.

It's a Twitter Client post updated status using Twitter API.



There are three EditText in the application, for user name, password (hiden by password dots) and updated status. Submit to Twitter by pressing of the Submit button. If successful, a Toast with "OK" will be shown, otherwise "ERROR" will be shown.



- Before start; base64 is needed in the application, refer to the article Use base64 in Android to download and include it in the Build Path of the project.

- Modify AndroidManifest.xml, Allows Android applications to open network sockets: "android.permission.INTERNET".

- Modify main.xml to have the input EditText for user name, password and updated status.
<?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:gravity="center_horizontal"
android:text="User Name and Password"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="User Name:"
/>
<EditText
android:id="@+id/username"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Password:"
/>
<EditText
android:id="@+id/password"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="textPassword"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="What are you doing?"
/>
<EditText
android:id="@+id/whatareyoudoing"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<Button
android:id="@+id/mySubmit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Submit"
/>
</LinearLayout>

main.xml can be downloaded here.

- Modify the java as:
package com.exercise.AndroidTwitterClient;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;

import org.apache.commons.codec.binary.Base64;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class AndroidTwitterClient extends Activity {

EditText MyUsername;
EditText MyPassword;
EditText MyStatus;

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

Button MySubmitButton = (Button)findViewById(R.id.mySubmit);
MySubmitButton.setOnClickListener(MySubmitButtonOnClickListener);
MyUsername = (EditText)findViewById(R.id.username);
MyPassword = (EditText)findViewById(R.id.password);
MyStatus = (EditText)findViewById(R.id.whatareyoudoing);
}

private Button.OnClickListener MySubmitButtonOnClickListener
= new Button.OnClickListener(){

@Override
public void onClick(View v) {
// TODO Auto-generated method stub

if (SendTwitter(MyUsername.getText().toString(),
MyPassword.getText().toString(),
MyStatus.getText().toString())){
Toast.makeText(AndroidTwitterClient.this,
"OK", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(AndroidTwitterClient.this,
"ERROR", Toast.LENGTH_SHORT).show();
}

}

};

public static boolean SendTwitter(String twitteruser,
String twitterpass, String msg) {

boolean result = true;

try {

//String twitteruser = "android_er";
//String twitterpass = "pass_word";
URLConnection connection = null;
String credentials = twitteruser + ":" + twitterpass;

String encodecredentials =
new String(Base64.encodeBase64(credentials.getBytes()));

URL url = new URL("http://twitter.com/statuses/update.xml");
String encodedData = URLEncoder.encode(msg, "UTF-8");

connection = url.openConnection();

connection.setRequestProperty( "Authorization",
"Basic " + encodecredentials);
connection.setDoOutput(true);

OutputStreamWriter out = new
OutputStreamWriter(connection.getOutputStream());
out.write("status=" + encodedData);
out.close();

BufferedReader in = new BufferedReader(
new InputStreamReader(connection.getInputStream()));

while (in.readLine() != null) {
}
in.close();
} catch (Exception e) {
result = false;
}

return result;

}
}

AndroidTwitterClient.java can be downloaded here.

7 comments:

Steven said...

Is this codes available now? Can you update still? There is some Exception - FileNotFound (the status xml file) on getInputStream.
Can you have another notes?

Nayanesh Gupte said...

yes I have the same doubt as Steven.

file not found exception!

Parth Dani said...

Hello Sir..I am trying to do this but the problem is that i am continuously getting error...when i insert the http://twitter.com/statuses/update.xml so can you please tell me how can i rectify this...

Android Er said...

I think this method have been outdated!

Parth Dani said...

okie....thank you so much sir but than can you please help me out with the modified method...

Kees Koenen said...

Dude / Dudette, you should really put a BIG Header in this post.. this NO longer works (as from yyyy-mm-dd).. let's continue the search for the current Twitter API stuff ;)

ansh said...

thank you @Kees , you saved some important minutes of my life :)