XyApp/src/com/dy/WelcomeActivity.java

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package com.dy;

/**
 这个界面是欢迎界面
 */
import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Menu;

public class WelcomeActivity extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.welcome);
		final Intent intent = new Intent(WelcomeActivity.this,
				LoginActivity.class);
		// 这里用了一个定时器，表示在这个界面停留一会儿在跳转
		Timer timer = new Timer();
		TimerTask tast = new TimerTask() {
			@Override
			public void run() {
				startActivity(intent);
			}
		};
		timer.schedule(tast, 3000);

	}

	@Override
	protected void onResume() {
		// TODO Auto-generated method stub
		super.onResume();

	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (requestCode == 0 && resultCode == 0) {
			if (data == null) {
				return;
			}
			finish();
		}
		super.onActivityResult(requestCode, resultCode, data);
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		// TODO Auto-generated method stub
		if (keyCode == KeyEvent.KEYCODE_BACK) {
			System.exit(0);
		}
		return super.onKeyDown(keyCode, event);