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[英]How to set Random GradientDrawable Color programmatically - Android
[英]Set color on GradientDrawable not working from Fragment
我有一个这样的背景可绘制:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:bottom="80dp"
android:id="@+id/card_background">
<shape>
<solid android:color="@color/x_card_color_pink"
android:height="100dp"/>
<corners
android:topLeftRadius="10dp"
android:topRightRadius="10dp"/>
</shape>
</item>
<item android:top="120dp">
<shape>
<solid android:color="@color/white"
android:height="100dp"/>
<corners
android:bottomLeftRadius="10dp"
android:bottomRightRadius="10dp"/>
</shape>
</item>
</layer-list>
我想改变card_background
的颜色。 当我从onCreate
活动设置新颜色时,它可以工作:
LayerDrawable layerDrawable = (LayerDrawable) ContextCompat.getDrawable(this, R.drawable.card_background);
GradientDrawable gradientDrawable = (GradientDrawable) layerDrawable.findDrawableByLayerId(R.id.card_background);
gradientDrawable.setColor(0xFFEBC51B); //Successfully set to yellow from activity
但是,如果尝试从也显示背景的片段中设置它,我无法更改它。 我希望稍后能够在 clickhandler 中执行此操作,但现在我在onCreate
片段中使用相同的代码:
LayerDrawable layerDrawable = (LayerDrawable) ContextCompat.getDrawable(getActivity(), R.drawable.card_background);
GradientDrawable gradientDrawable = (GradientDrawable) layerDrawable.findDrawableByLayerId(R.id.card_background);
gradientDrawable.setColor(0xFF5ABC63); //Fail to set to green from fragment
我在想,既然我在更新片段的同时显示片段,我必须刷新它还是什么? 我尝试了方法invalidateSelf
但没有效果。
关于如何从 Fragment 更改背景颜色的任何想法?
哦,我找到了一个解决方案:
LayerDrawable layerDrawable = (LayerDrawable) ContextCompat.getDrawable(getActivity(), R.drawable.card_background);
GradientDrawable gradientDrawable = (GradientDrawable) layerDrawable.findDrawableByLayerId(R.id.card_background);
gradientDrawable.setColor(0xFF5ABC63);
RelativeLayout layout = (RelativeLayout) rootView.findViewById(R.id.card_layout);
layout.setBackground(layerDrawable);
如果我再次将 drawable 设置为我的布局,它会更新背景。
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