<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".SplashActivity" >
  <ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/welcome_android"
    android:scaleType="fitCenter" />
</RelativeLayout>

package cn.eoe.leigo.splash;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
/**
 *
 * @{#} SplashActivity.java Create on 2013-5-2 下午9:10:01
 *
 * class desc:  启动画面
 *
 * <p>Copyright: Copyright(c) 2013 </p>
 * @Version 1.0
 * @Author <a href="mailto:gaolei_xj@163.com">Leo</a>
 *
 *
 */
public class SplashActivity extends Activity {
  //延迟3秒
  private static final long SPLASH_DELAY_MILLIS = 3000;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splash);
    // 使用Handler的postDelayed方法，3秒后执行跳转到MainActivity
    new Handler().postDelayed(new Runnable() {
      public void run() {
        goHome();
      }
    }, SPLASH_DELAY_MILLIS);
  }
  private void goHome() {
    Intent intent = new Intent(SplashActivity.this, MainActivity.class);
    SplashActivity.this.startActivity(intent);
    SplashActivity.this.finish();
  }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="cn.eoe.leigo.splash"
  android:versionCode="1"
  android:versionName="1.0" >
  <uses-sdk
    android:minSdkVersion="10"
    android:targetSdkVersion="10" />
  <application
    android:icon="@drawable/logo"
    android:label="@string/app_name" >
    <activity
      android:name=".SplashActivity"
      android:configChanges="keyboardHidden"
      android:label="@string/app_name"
      android:launchMode="singleTask"
      android:screenOrientation="portrait"
      android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
      <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
      </intent-filter>
    </activity>
    <activity android:name=".MainActivity" />
  </application>