在startActivity后，调用overridePendingTransition方法，例如，
一)实现淡入淡出的效果如下:

startActivity(new Intent(SplashActivity.this, MainActivity.class));

SplashActivity.this.finish();

overridePendingTransition(android.R.anim.fade_in,android.R.anim.fade_out);

二)由左向右滑入的效果改变一下参数即可

overridePendingTransition(android.R.anim.slide_in_left,android.R.anim.slide_out_right);

三)要实现zoomin和zoomout,即类似iphone的进入和退出时的效果

在res目录下新建文件夹anim,然后在anim下新建两个xml,默认选项不用更改，分别命名为zoomin.xml和zoomout.xml,

<?xml version="1.0" encoding="utf-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android"

android:interpolator="@android:anim/decelerate_interpolator" >

<scale

android:duration="@android:integer/config_mediumAnimTime"

android:fromXScale="2.0"

android:fromYScale="2.0"

android:pivotX="50%p"

android:pivotY="50%p"

android:toXScale="1.0"

android:toYScale="1.0" />

</set>

<?xml version="1.0" encoding="utf-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android"

android:interpolator="@android:anim/decelerate_interpolator"

android:zAdjustment="top" >

<scale

android:duration="@android:integer/config_mediumAnimTime"

android:fromXScale="1.0"

android:fromYScale="1.0"

android:pivotX="50%p"

android:pivotY="50%p"

android:toXScale=".5"

android:toYScale=".5" />

<alpha

android:duration="@android:integer/config_mediumAnimTime"

android:fromAlpha="1.0"

android:toAlpha="0" />

</set>

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import hgy.test.PendingTransition.R;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        new Handler().postDelayed(new Runnable(){

@Override
   public void run() {
    Intent mainIntemt = new Intent(MainActivity.this,AndroidNews.class);
    MainActivity.this.startActivity(mainIntemt);
    MainActivity.this.finish();
    //overridePendingTransition(R.anim.fade_in,R.anim.fade_out);
    
    //实现淡入浅出的效果
    overridePendingTransition(android.R.anim.fade_in,android.R.anim.fade_out);
     
    //由左向右滑入的效果
    //overridePendingTransition(android.R.anim.slide_in_left,android.R.anim.slide_out_right);
    
    //实现zoommin 和 zoomout,即类似iphone的进入和退出时的效果
    //overridePendingTransition(R.anim.zoomin, R.anim.zoomout);
   }
         
        },3000);
    }
}