Ripple effect over imageview

问题

To describe my problem i created small example.

I have linearlayout with imageview and textview. For linearlayout i've set ripple drawable as background. But when i click or long click on linearlayout ripple animation shows under imageview. How show animation over imageview ?

main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/linear"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:background="@drawable/ripple"
        android:clickable="true"
        android:orientation="vertical">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:src="@mipmap/index" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="This is ripple test"
            android:textColor="#FF00FF00" />
    </LinearLayout>

</android.support.constraint.ConstraintLayout>

drawable-v21/ripple.xml:

<?xml version="1.0" encoding="utf-8"?>
<ripple
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="#FFFF0000">   
    <item>
        <shape android:shape="rectangle">
            <solid android:color="#FF000000"/>
        </shape>
    </item>    
</ripple>

drawable/ripple.xml:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">    
    <item android:state_pressed="true">
        <shape android:shape="rectangle">
            <corners android:radius="3dp" />
            <solid android:color="#FFFF0000" />
        </shape>
    </item>
    <item android:state_focused="true">
        <shape android:shape="rectangle">
            <corners android:radius="3dp" />
            <solid android:color="#FFFF0000" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <corners android:radius="3dp" />
            <solid android:color="#FF000000" />
        </shape>
    </item>    
</selector>

screenshot how it looks now:

回答1:

Add android:background="@null" for the ImageView

回答2:

Add the ripple like this

android:foreground="?android:attr/selectableItemBackground"

based on this answer https://stackoverflow.com/a/35753159/2736039

回答3:

If your app needs to run on API < 23, you won't be able to use the foreground attribute on views other than FrameLayout, which means adding another [useless] level in the view tree hierarchy.

Another solution is to wrap your image with a <ripple>, set it as your ImageView's background, and use tint and tintMode to "hide" the src image so the background image that has the ripple over it is visible.

<!-- In your layout file -->

<ImageView
    android:adjustViewBounds="true"
    android:background="@drawable/image_with_ripple"
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"
    android:src="@drawable/image"
    android:tint="@android:color/transparent"
    android:tintMode="src_in" />

<!-- drawable/image_with_ripple.xml -->

<?xml version="1.0" encoding="utf-8"?>
<ripple
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="?colorControlHighlight">

    <item android:drawable="@drawable/image" />

</ripple>

Not only this works on API 21+ but if your image has rounded corners – or is another type of non-rectangle shape, like a star or a heart icon – the ripple will remain in its bounds instead of filling the view's rectangle bounds, which gives a better look in some cases.

See this Medium article for an animated GIF to see how this technique compares to using a <FrameLayout> or the foreground attribute.

来源：https://stackoverflow.com/questions/41363877/ripple-effect-over-imageview

标签

android

rippledrawable