代码：

WelcomeA.java:

package com.example.welcome;

import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.content.Intent;

public class WelcomeA extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent intent = new Intent(WelcomeA.this, WhatsnewPagesA.class);
startActivity(intent);
WelcomeA.this.finish();
}
}, 2000);
}
}

hello.java:

package com.example.welcome;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;

public class WhatsnewPagesA extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}