Android 官网 Animation Resources 的一个bug?

最新推荐文章于 2025-06-28 17:00:00 发布

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最新推荐文章于 2025-06-28 17:00:00 发布

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本文详细介绍了如何使用XML定义Frame动画，并通过Java代码实现背景设置与播放。包括动画列表元素、帧元素属性和一个具体示例。此外，文章还讨论了与资源引用的相关问题。

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http://developer.android.com/guide/topics/resources/animation-resource.html#Frame

Frame animation

An animation defined in XML that shows a sequence of images in order (like a film).

FILE LOCATION:

res/drawable/filename.xml
The filename will be used as the resource ID.

COMPILED RESOURCE DATATYPE:

Resource pointer to an AnimationDrawable.

RESOURCE REFERENCE:

In Java: R.drawable.filename
In XML: @[package:]drawable.filename

SYNTAX:

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot=["true" | "false"] >
    <item
        android:drawable="@[package:]drawable/drawable_resource_name"
        android:duration="integer" />
</animation-list>

ELEMENTS:

<animation-list>

Required. This must be the root element. Contains one or more <item> elements.

attributes:

android:oneshot

Boolean. "true" if you want to perform the animation once; "false" to loop the animation.

<item>

A single frame of animation. Must be a child of a <animation-list> element.

attributes:

android:drawable

Drawable resource. The drawable to use for this frame.

android:duration

Integer. The duration to show this frame, in milliseconds.

EXAMPLE:

XML file saved at res/anim/rocket.xml:

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="false">
    <item android:drawable="@drawable/rocket_thrust1" android:duration="200" />
    <item android:drawable="@drawable/rocket_thrust2" android:duration="200" />
    <item android:drawable="@drawable/rocket_thrust3" android:duration="200" />
</animation-list>

This application code will set the animation as the background for a View, then play the animation:

ImageView rocketImage = (ImageView) findViewById(R.id.rocket_image);
rocketImage.setBackgroundResource(R.drawable.rocket_thrust);

rocketAnimation = (AnimationDrawable) rocketImage.getBackground();
rocketAnimation.start();