Activity转场动效
Activity转场动效
Activity原生转场的动画效果实现
xml中实现Activity的转场动效
动效xml文件(frameworks/base/core/res/res/anim)
activity_close_enter.xml
activity_close_exit.xml
activity_open_enter.xml
activity_open_exit.xml
task_close_enter.xml
task_close_exit.xml
task_open_enter.xml
task_open_exit.xml对应的引用文件(frameworks/base/core/res/res/values/styles.xml)
<!-- Standard animations for a full-screen window or activity. -->
<style name="Animation.Activity">
<item name="activityOpenEnterAnimation">@anim/activity_open_enter</item>
<item name="activityOpenExitAnimation">@anim/activity_open_exit</item>
<item name="activityCloseEnterAnimation">@anim/activity_close_enter</item>
<item name="activityCloseExitAnimation">@anim/activity_close_exit</item>
<item name="taskOpenEnterAnimation">@anim/task_open_enter</item>
<item name="taskOpenExitAnimation">@anim/task_open_exit</item>
<item name="taskCloseEnterAnimation">@anim/task_close_enter</item>
<item name="taskCloseExitAnimation">@anim/task_close_exit</item>
...
</style>这些动画具体的在什么情况下被使用，在源码中有解释(frameworks/base/core/res/res/values/attrs.xml)
<!-- When opening a new activity, this is the animation that is
run on the next activity (which is entering the screen). -->
<!-- 当打开一个新活动时，这是在下一个活动（即进入屏幕）上运行的动画 -->
<attr name="activityOpenEnterAnimation" format="reference" />
<!-- When opening a new activity, this is the animation that is
run on the previous activity (which is exiting the screen). -->
<!-- 当打开一个新活动时，这是在先前的活动中运行的动画（它正在退出屏幕） -->
<attr name="activityOpenExitAnimation" format="reference" />
<!-- When closing the current activity, this is the animation that is
run on the next activity (which is entering the screen). -->
<!-- 在关闭当前活动时，这是在下一次活动（即进入屏幕）上运行的动画 -->
<attr name="activityCloseEnterAnimation" format="reference" />
<!-- When closing the current activity, this is the animation that is
run on the current activity (which is exiting the screen). -->
<!-- 当关闭当前活动时，这是在当前活动上运行的动画（它正在退出屏幕） -->
<attr name="activityCloseExitAnimation" format="reference" />
<!-- When opening an activity in a new task, this is the animation that is
run on the activity of the new task (which is entering the screen). -->
<!-- 当在一个新任务中打开一个活动时，这是在新任务（进入屏幕）活动上运行的动画 -->
<attr name="taskOpenEnterAnimation" format="reference" />
<!-- When opening an activity in a new task, this is the animation that is
run on the activity of the old task (which is exiting the screen). -->
<!-- 当在一个新任务中打开一个活动时，这是在旧任务的活动上运行的动画（它正在退出屏幕） -->
<attr name="taskOpenExitAnimation" format="reference" />
<!-- When closing the last activity of a task, this is the animation that is
run on the activity of the next task (which is entering the screen). -->
<!-- 当关闭任务的最后一个活动时，这是运行在下一个任务（正在进入屏幕）活动上的动画 -->
<attr name="taskCloseEnterAnimation" format="reference" />
<!-- When opening an activity in a new task, this is the animation that is
run on the activity of the old task (which is exiting the screen). -->
<!-- 当在一个新任务中打开一个活动时，这是在旧任务的活动上运行的动画（它正在退出屏幕） -->
<attr name="taskCloseExitAnimation" format="reference" />博客中找到更直白的解释
解释1:
android:activityOpenEnterAnimation:
一个activity创建进入的效果。
android:activityOpenExitAnimation :
一个activity还没有finish()下退出效果, 比如有俩个activity A与B 首先启动A 然后再启动B 那么A还没有finish() 这时A的退出效果。
android:activityCloseEnterAnimation:
表示上一个activity返回进入效果 比如有俩个activity A与B B在最上面，B退出(finish)后 A重新进入的效果。
android:activityCloseExitAnimation:
表示的是activity finish()之后的效果 比如有俩个activity A与B B退出后会被finish() 那么B的退出效果在这定义。
解释2：
android:activityOpenEnterAnimation:
Activity A跳转到Activity B时Activity B进入动画
android:activityOpenExitAnimation :
Activity A跳转到Activity B时Activity A退出动画
android:activityCloseEnterAnimation:
Activity B返回Activity A时Activity A的进入动画
android:activityCloseExitAnimation:
Activity B返回Activity A时ActivityB的退出动画
了解了具体的动画调用时机，通过自定义一个动画Style(复写”Animation.Activity”)，加入新的动画效果，继而在Theme中引用该Style，并在应用中引用该Theme，就能达到目的。
如果不想使用动画，可以将其删除，将styles.xml中的应用动画置为null即可，如下：
<style name="custom_animation" parent="@android:style/Animation.Activity">
<item name="android:activityOpenEnterAnimation">@null</item>
<item name="android:activityOpenExitAnimation">@null</item>
<item name="android:activityCloseEnterAnimation">@null</item>
<item name="android:activityCloseExitAnimation">@null</item>
</style>代码中实现Activity的转场动效
涉及到一个方法：public void overridePendingTransition (int enterAnim, int exitAnim)
调用时机：startActivity（intent）之后，和finish（）之后，不然会不起作用 enterAnim:下个Activity进入的动效 exitAnim:当前Activity退出的动效
源码中有明确说明：@
Activity.java
/**
* Call immediately after one of the flavors of {@link #startActivity(Intent)}
* or {@link #finish} to specify an explicit transition animation to
* perform next.
*
* <p>As of {@link android.os.Build.VERSION_CODES#JELLY_BEAN} an alternative
* to using this with starting activities is to supply the desired animation
* information through a {@link ActivityOptions} bundle to
* {@link #startActivity(Intent, Bundle)} or a related function. This allows
* you to specify a custom animation even when starting an activity from
* outside the context of the current top activity.
*
* @param enterAnim A resource ID of the animation resource to use for
* the incoming activity. Use 0 for no animation.
* @param exitAnim A resource ID of the animation resource to use for
* the outgoing activity. Use 0 for no animation.
*/
public void overridePendingTransition(int enterAnim, int exitAnim) {
try {
ActivityManager.getService().overridePendingTransition(
mToken, getPackageName(), enterAnim, exitAnim);
} catch (RemoteException e) {
}
}示例
实现淡入淡出的效果 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);
动画：最基本的View动画
View动画的作用对象是View，四种动画效果：平移，缩放，旋转，透明度。
上一篇： Python Day03