Setting style android:windowIsTranslucent seems to

问题:

I have the following style on in my style.xml and is a follow up to my question here Activity transition effects: slide in for the top activity and scale for the bottom activity:

<style name="RevealTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:windowAnimationStyle">@style/ActivityAnimation</item>
</style>

<style name="ActivityAnimation" parent="@android:style/Animation">
    <item name="android:activityOpenEnterAnimation">@anim/animation_in</item>
    <item name="android:activityOpenExitAnimation">@anim/animation_out</item>
    <item name="android:activityCloseEnterAnimation">@anim/animation_back_in</item>
    <item name="android:activityCloseExitAnimation">@anim/animation_back_out</item>
</style>

I have found that the style android:windowBackgroundconflicts with android:windowAnimationStyle and the animation is not fully displaying. If I include the above style as is in my style.xml and run my app, I get the following:

If I comment out the lines here:

<style name="RevealTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="android:windowBackground">@android:color/transparent</item> 
    <!--<item name="android:windowIsTranslucent">true</item> COMMENTED OUT-->
    <item name="android:windowAnimationStyle">@style/ActivityAnimation</item>
</style>

<style name="ActivityAnimation" parent="@android:style/Animation">
    <item name="android:activityOpenEnterAnimation">@anim/animation_in</item>
    <item name="android:activityOpenExitAnimation">@anim/animation_out</item>
    <item name="android:activityCloseEnterAnimation">@anim/animation_back_in</item>
    <item name="android:activityCloseExitAnimation">@anim/animation_back_out</item>
</style>

I don't understand why this is the case. I need the windowIsTranslucent for some of my other animations.

These are the xml animation class I'm using (thanks to Nikolai Doronin):

activity_in.xml:

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:fromXDelta="100%p"
        android:toXDelta="0%p"
        android:duration="@integer/activityAnimationTime">
    </translate>
</set>

activity_out.xml:

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <scale
        android:fromXScale="1.0"
        android:toXScale="0.84"
        android:fromYScale="1.0"
        android:toYScale="0.84"
        android:duration="@integer/activityAnimationTime"/>
    <translate
        android:fromYDelta="0%"
        android:fromXDelta="0%"
        android:toYDelta="8%"
        android:toXDelta="16%"
        android:duration="@integer/activityAnimationTime"/>

    <alpha
        android:fromAlpha="1.0"
        android:toAlpha="0.25"
        android:duration="@integer/activityAnimationTime"/>

</set>

activity_back_in.xml:

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <scale
        android:fromXScale="0.84"
        android:toXScale="1.0"
        android:fromYScale="0.84"
        android:toYScale="1.0"
        android:duration="@integer/activityAnimationTime"/>
    <translate
        android:fromYDelta="8%"
        android:fromXDelta="16%"
        android:toYDelta="0%"
        android:toXDelta="0%"
        android:duration="@integer/activityAnimationTime"/>

    <alpha
        android:fromAlpha="0.25"
        android:toAlpha="1.0"
        android:duration="@integer/activityAnimationTime"/>

</set>

activity_back_out.xml:

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:fromXDelta="0%p"
        android:toXDelta="100%p"
        android:duration="@integer/activityAnimationTime">
    </translate>
</set>

回答1:

You can try this, change

<style name="ActivityAnimation" parent="@android:style/Animation">

to

<style name="ActivityAnimation" parent="@android:style/Animation.Translucent">