我有情况，我希望在3秒后改变活动的布局。何我能做到这一点？ 例如应用程序开始启动画面，它会自动运行3秒钟，然后切换布局应用程序的第一个屏幕布局。这应该在相同的活动发生，任何想法？

I have situation where I want to change layout of activity after 3 seconds. Ho can I do that? For example application starts with splashscreen that will run for 3 seconds then automatically switch layout to application's first screen layout. This should happen in the same activity, any ideas?

感谢

推荐答案

我这样做只使用一个XML布局。我只是把一个额外的RelativeLayout的在它的重新presents我介绍屏幕，然后我用一个淡出动画就可以了，然后调用.setVisibility（View.GONE）。

I did this using only one xml layout. I just put an extra RelativeLayout in it that represents my intro screen then I use a fadeOut Animation on it and then call .setVisibility(View.GONE).

这是我的main.xml布局文件的一部分

This is part of my main.xml layout file

<RelativeLayout
        android:id="@+id/introLayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
      android:background="#FFFFFF"
    >

        <ImageView
        android:id="@+id/logoImg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:src="@drawable/logo">
        </ImageView>
    </RelativeLayout>

然后在我的活动我有这样的：

Then inside my activity I have this:

introLayout = (RelativeLayout) findViewById(R.id.introLayout);
Animation fadeOutAnim = AnimationUtils.loadAnimation(MyActivity.this, R.anim.fadeout);
introLayout.startAnimation(fadeOutAnim);
introLayout.setVisibility(View.GONE);

您可以通过将startAnimation（），以及所述setVisibility的一个可运行的内部和使用postDelayed（）如上述马库斯使3秒后该运行。不要考虑做一些工作，而这个介绍布局在屏幕上的，所以它不只是有3秒钟的延迟，为用户。也许检查以查看是否该应用程序的运行版本是当前版本或没有。

You could make this run after 3 seconds by putting the startAnimation(), and the setVisibility inside of a runnable and using postDelayed() as markus mentioned. Do consider doing some work while this intro layout is on the screen though, so its not just a 3 second delay for the user. Perhaps check to see if the running version of the application is the current version or not.

编辑： 你需要的fadout.xml文件添加到 / RES /动画/ （创建动画目录，如果它不存在）。下面是一个例子。

You'll need to add the fadout.xml file to /res/anim/ (create the anim directory if it doesn't exist). Here is an example.

fadeout.xml

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

<alpha xmlns:android="http://schemas.android.com/apk/res/android"
       android:interpolator="@android:anim/accelerate_interpolator"
       android:fromAlpha="1.0" android:toAlpha="0.0" android:duration="700" 
       android:fillAfter="true"/>