Patchy.java

package apt.tutorial.two;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import winterwell.jtwitter.Twitter;

public class Patchy extends Activity {
	private EditText status=null;
	private SharedPreferences prefs=null;
	private Twitter client=null;
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		
		status=(EditText)findViewById(R.id.status);
		
		Button send=(Button)findViewById(R.id.send);
		
		send.setOnClickListener(onSend);
		
		prefs=PreferenceManager.getDefaultSharedPreferences(this);
		prefs.registerOnSharedPreferenceChangeListener(prefListener);
	}
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		new MenuInflater(getApplication())
																	.inflate(R.menu.option, menu);

		return(super.onCreateOptionsMenu(menu));
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		if (item.getItemId()==R.id.prefs) {
			startActivity(new Intent(this, EditPreferences.class));
			
			return(true);
		}
		
		return(super.onOptionsItemSelected(item));
	}
	
	synchronized private Twitter getClient() {
		if (client==null) {
			client=new Twitter(prefs.getString("user", ""),
													prefs.getString("password", ""));
			
			client.setAPIRootUrl("https://identi.ca/api");
		}
		
		return(client);
	}
	
	synchronized private void resetClient() {
		client=null;
	}
	
	private void updateStatus() {
		try {
			getClient().updateStatus(status.getText().toString());
		}
		catch (Throwable t) {
			Log.e("Patchy", "Exception in updateStatus()", t);
			goBlooey(t);
		}
	}
	
	private void goBlooey(Throwable t) {
		AlertDialog.Builder builder=new AlertDialog.Builder(this);
		
		builder
			.setTitle("Exception!")
			.setMessage(t.toString())
			.setPositiveButton("OK", null)
			.show();
	}
	
	private View.OnClickListener onSend=new View.OnClickListener() {
		public void onClick(View v) {
			updateStatus();
		}
	};
	
	private SharedPreferences.OnSharedPreferenceChangeListener prefListener=
		new SharedPreferences.OnSharedPreferenceChangeListener() {
		public void onSharedPreferenceChanged(SharedPreferences sharedPrefs, String key) {
			if (key.equals("user") || key.equals("password")) {
				resetClient();
			}
		}
	};
}