Afficher la largeur de l'écran

package com.example.infoaffichage;

import com.example.infoaffichage.R.id;

import android.os.Bundle;
import android.app.Activity;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class MainActivity extends Activity {
	
	RelativeLayout Screen = null;
	TextView TextScreenWidth = null;
	TextView TextScreenHeight = null;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	
		Screen = (RelativeLayout)findViewById(id.Screen_xml);
				
		String ScreenWidth_String = Integer.toString(Screen.getWidth());
			
		TextScreenWidth = (TextView)findViewById(id.TextLargeurEcran_xml);
		TextScreenWidth.setText(ScreenWidth_String);
	
		//...
	}
}