Android Shape XML以编程方式旋转可绘制更改颜色 [英] android shape xml rotated drawable change color programmatically
本文介绍了Android Shape XML以编程方式旋转可绘制更改颜色的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
这是三角形的xml:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:id="@+id/shape_id">
<rotate
android:fromDegrees="45"
android:toDegrees="45"
android:pivotX="-40%"
android:pivotY="87%" >
<shape android:shape="rectangle" >
<stroke android:width="10dp"/>
</shape>
</rotate>
</item>
</layer-list>
这是textview的背景
And this is a background of a textview
<TextView
android:id="@+id/headlineSelect_TXT2"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_weight="1"
android:background="@drawable/category_triangle_shape1"
android:visibility="invisible" />
我想以编程方式更改形状的颜色.我尝试了这个,但是我得到了空指针异常
And I want to change color of shape programmatically. I tried this but I am getting null pointer exception
LayerDrawable bgDrawable = (LayerDrawable) getActivity()
.getResources()
.getDrawable(R.drawable.category_triangle_shape1);
final GradientDrawable shape = (GradientDrawable) bgDrawable
.findDrawableByLayerId(R.id.shape_id);
shape.setStroke(10,Color.GREEN);
我该怎么做?感谢您的帮助.
How can I do that? Thanks for help.
推荐答案
这有些棘手,涉及很多强制类型转换:
This is somewhat tricky and involves a lot of casts:
TextView view = (TextView) findViewById( R.id.my_text_view );
// Get the drawable from the view, if you're using an imageview src
// element you'll go with view.getDrawable()
LayerDrawable layers = (LayerDrawable) view.getBackground();
// Now get your shape by selecting the id
RotateDrawable rotate = (RotateDrawable) layers.findDrawableByLayerId( R.id.shape_id );
// Finally you can access the underlying shape
GradientDrawable drawable = (GradientDrawable) rotate.getDrawable();
// ... and do you fancy things
drawable.setColor( ... );
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