Google Android Tutorial

Demo 3 - Ticker

The third demo is a 'ticker' having a textbox for entering the ticker's text, a ticker(timer) , two labels(editview) one for status and the other for diplaying the sliding message.

<LinearLayout xmlns:android=http://schemas.android.com/apk/res/android
   android:layout_width="fill_parent"    
   android:layout_height="fill_parent"    
   android:orientation="vertical">                                                                           
<EditText android:id="@+id/text1"        
   android:layout_width="fill_parent"        
   android:layout_height="wrap_content" />                                                                          
<Ticker android:id="@+id/ticker1"        
android:layout_width="fill_parent"        
android:layout_height="wrap_content" 
android:layout_marginTop="20dip" />                                                                   
<TextView android:id="@+id/label1"            
  android:layout_width="wrap_content"            
  android:layout_height="fill_parent" />                                                                    
 </Ticker>
<TextView android:id="@+id/label2"        
  android:layout_width="fill_parent"        
  android:layout_height="wrap_content"        
   android:layout_marginTop="20dip"  />                                                          
</LinearLayout>

 LinearLayout with vertical orientation is like FlowLayout but in a vertical direction.

package mypack.mydemos;

import android.app.Activity;
import android.os.Handler;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;
import java.util.Map;

public class demo extends Activity

implements Ticker.TickerListener {
	Ticker ticker1;
	TextView label1, label2;
	EditText text1;

	@Override
	protected void onCreate(Bundle icicle) {
		super.onCreate(icicle);
		setContentView(R.layout.main);
		ticker1 = (Ticker) findViewById(R.id.ticker1);
		label1 = (TextView) findViewById(R.id.label1);
		label2 = (TextView) findViewById(R.id.label2);
		text1 = (EditText) findViewById(R.id.text1);
		ticker1.setTickerListener(this);
		text1.setOnClickListener(new clicker());
	}

	class clicker implements EditText.OnClickListener {
		public void onClick(View v) {

			label1.setText(text1.getText());
			ticker1.startTicker();
			label2.setText("Ticking...");
		}
	}

	public void onTickerFinished(Ticker view) {
		label2.setText("Done!");
	}

}

Demo 4 - Checkbox 

Copy this to tools\demo\res\layout\

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout android:id="@+id/widget1"
	android:layout_width="fill_parent" android:layout_height="fill_parent"
	xmlns:android="http://schemas.android.com/ apk/res/android">
	<CheckBox android:id="@+id/check1"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" android:text="java"
		android:layout_x="50px" android:layout_y="22px">
	</CheckBox>

	<CheckBox android:id="@+id/check2"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" android:text="C#"
		android:layout_x="50px" android:layout_y="72px">
	</CheckBox>

	<Button android:id="@+id/button1"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" android:text="Confirm"
		android:layout_x="60px" android:layout_y="122px">
	</Button>

	<EditText android:id="@+id/text1"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" android:text="EditText"
		android:textSize="18sp" android:layout_x="60px"
		android:layout_y="202px">
	</EditText>
</AbsoluteLayout>

To be copied to tools\demo\mypack\mydemos

package mypack.mydemos;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.*;

public class demo extends Activity

{

	Button button1;
	CheckBox check1, check2;
	EditText text1;

	@Override
	public void onCreate(Bundle icicle)

	{
		super.onCreate(icicle);
		setContentView(R.layout.main);
		text1 = (EditText) this.findViewById(R.id.text1);
		check1 = (CheckBox) findViewById(R.id.check1);
		check2 = (CheckBox) findViewById(R.id.check2);

		button1 = (Button) findViewById(R.id.button1);
		button1.setOnClickListener(new clicker());

	}

	class clicker implements Button.OnClickListener

	{
		public void onClick(View v)

		{

			String r = "";
			if (check1.isChecked())
			{
				r = r + "java" + "\n";
			}
			if (check2.isChecked())
			{
				r = r + "c#";
			}
			text1.setText(r);
		}

	}

}

This is just the usual Java code and needs very little explanation. The only difference is the way , the controls are defined ( through res\layout\xml file).