Reputation: 547
I create a custom RelativeLayout to add a border.But border is not appear. When I add background attribute,the border will appear.When I remove background attributes,border disappear.I want to show border without background attribute. Can anyone explain me how to solve this problem.
Here is my code...
public class BorderRelativeLayout extends RelativeLayout {
Paint paint;
Rect rect;
public BorderRelativeLayout(Context context) {
super(context);
init();
}
public BorderRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public void init(){
paint = new Paint();
paint.setColor(Color.RED);
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(20f);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
rect = new Rect(0,0,getWidth(),getHeight());
canvas.drawRect(rect,paint);
}
}
Upvotes: 1
Views: 350
Reputation: 54204
For RelativeLayout
, onDraw()
isn't called unless you have a background set. So you cannot create a border in this manner.
However, you can add a border to your RelativeLayout
much more easily than by creating a custom subclass. Simply create a ShapeDrawable
in XML and assign it to your layout.
border.xml
<?xml version="1.0" encoding="utf-8"?>
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<stroke
android:width="5dp"
android:color="#f00"/>
</shape>
layout.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/border">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="24dp"
android:textColor="#000"
android:textStyle="bold"
android:text="hello world"/>
</RelativeLayout>
Upvotes: 1