如何在Android 5.0 Lollipop中以代码方式(而非xml)以编程方式使用RippleDrawable?

问题描述：

我的涟漪代码如下:

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

        <shape android:shape="oval">
            <solid android:color="?android:colorAccent"/>
        </shape>
    </item>
</ripple>

现在，我想让用户可以选择自己的颜色，因此我需要以编程方式创建波纹.
我发现了此，我认为这是正确的方法它，但我不知道该如何处理.

Now I want to give the user the possibility to choose own colors, so I need to create the ripple programmatically.
I found this and I think this is the right way to do it, but I don't know how to handle with this.

波纹将在这里使用:

<ImageButton
    android:id="@+id/add_button"
    android:layout_width="@dimen/diameter"
    android:layout_height="@dimen/diameter"
    android:layout_gravity="end|bottom"
    android:layout_marginBottom="@dimen/add_button_margin"
    android:layout_marginEnd="@dimen/add_button_margin"
    android:layout_alignParentBottom="true"
    android:layout_alignParentEnd="true"
    android:src="@drawable/ic_action_add_person"
    android:tint="@android:color/white"
    android:background="@drawable/oval_ripple"
    android:elevation="@dimen/elevation_low"
    android:stateListAnimator="@anim/button_elevation"
    android:contentDescription="Neuer Spieler" />

我需要像这样将背景设置为RippleDrawable:

I need to set the background to a RippleDrawable like this:

addButton.setBackground(ripple);

答

这就是我实现此目标的方式.

This is how I was able to achieve this.

请注意，这仅是Api 21+，因此，如果您支持较低版本，则必须回退到普通的Drawable.

public static RippleDrawable getPressedColorRippleDrawable(int normalColor, int pressedColor)
{
    return new RippleDrawable(getPressedColorSelector(normalColor, pressedColor), getColorDrawableFromColor(normalColor), null);
}

public static ColorStateList getPressedColorSelector(int normalColor, int pressedColor)
{
    return new ColorStateList(
        new int[][]
            {
                new int[]{android.R.attr.state_pressed},
                new int[]{android.R.attr.state_focused},
                new int[]{android.R.attr.state_activated},
                new int[]{}
            },
        new int[]
            {
                pressedColor,
                pressedColor,
                pressedColor,
                normalColor
            }
    );
}

public static ColorDrawable getColorDrawableFromColor(int color)
{
    return new ColorDrawable(color);
}

修改: 我对此进行了更多修改，发现ColorStateList不需要像上述解决方案一样复杂.我已将其简化为以下代码段. (以上代码块中的所有其他内容都是相同的.我只更改了ColorStateList的创建.)如果此方法不适用于某人，则将上面的块保留为原始代码.

I tinkered with this some more and discovered that the ColorStateList doesn't need to be nearly as complex as the above solution. I have simplified it to the below snippet. (Everything else in the above code block is the same. I only changed the ColorStateList creation.) I will leave the above block as the original, in case this method doesn't work for someone.

new ColorStateList(
    new int[][]
        {
            new int[]{}
        },
    new int[]
        {
            pressedColor
        }
);

如何在Android 5.0 Lollipop中以代码方式(而非xml)以编程方式使用RippleDrawable?

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