hello world android

Dans cet exemple, on va montrer comment developper mon premier projet android.


voici le vidéo qui montre la création de premier projet:






Voici le code de notre activity MainActivity.java

	package com.formation.helloworldproject;
	import android.app.Activity;
	import android.os.Bundle;
	import android.view.Menu;
	import android.view.MenuItem;
	import android.view.View;
	import android.view.View.OnClickListener;
	import android.widget.Button;
	import android.widget.EditText;
	import android.widget.Toast;
	public class MainActivity extends Activity {
	Button btn;
	EditText editext;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.test);
	btn=(Button) findViewById(R.id.button2);
	editext=(EditText) findViewById(R.id.editText1);
	btn.setOnClickListener(new OnClickListener() {
	@Override
	public void onClick(View v) {
	// TODO Auto-generated method stub
	String nom=editext.getText().toString();
	Toast.makeText(MainActivity.this, "hello "+nom, Toast.LENGTH_LONG).show();
	}
	});
	}
	}

view raw MainActivity.java hosted with ❤ by GitHub

Toast:est un composant pour afficher le message lors de clique sur le bouton
Par la suite on doit créer le layout test.xml suivant:

	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:orientation="vertical" >
	<TextView
	android:id="@+id/textView1"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text="@string/nom" />
	<EditText
	android:id="@+id/editText1"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:ems="10"
	>
	<requestFocus />
	</EditText>
	<Button
	android:id="@+id/button2"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:layout_gravity="center"
	android:text="Button" />
	</LinearLayout>

view raw test.xml hosted with ❤ by GitHub