<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="?android:attr/colorControlHighlight">
<item>
<selector>
<item android:state_selected="true">
<layer-list>
<item android:left="-5dp"
android:top="-5dp"
android:right="-5dp">
<shape android:shape="rectangle">
<stroke android:width="3dp"
android:color="@android:color/white"/>
<solid android:color="@android:color/transparent"/>
</shape>
</item>
</layer-list>
</item>
<item android:state_selected="false">
<shape android:shape="rectangle">
<solid android:color="@android:color/transparent"/>
</shape>
</item>
</selector>
</item>
</ripple>
这是我的波纹可绘制，我想改变状态选择, solid color.
我尝试过的代码：
RippleDrawable rippleDrawable = (RippleDrawable) textView.getBackground(); // assumes bg is a RippleDrawable
int[][] states = new int[][]{new int[]{android.R.attr.state_selected}};
int[] colors = new int[]{R.color.white};
ColorStateList colorStateList = new ColorStateList(states, colors);
rippleDrawable.setColor(colorStateList);
不幸的是它不起作用..我错过了什么，这可能吗？
您应该向项目添加一个 id 以便通过 java/kotlin 访问它们。
检查这个后台 XML 文件
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="#e0e0e0">
<item android:id="@+id/fab_shape">
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="25dp" />
<solid android:color="@color/colorAccent" />
</shape>
</item>
</ripple>
要更改其纯色，请在constraintLayout背景上应用此可绘制XML
val background = constraintLayout.background as RippleDrawable
val bgShape = background.findDrawableByLayerId(R.id.fab_shape) as GradientDrawable
bgShape.color = color
以供参考读这个
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