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.