Created
October 31, 2019 04:42
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Shadowed textview wrapper over default textview available in Android SDK.
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| public class ShadowTextView extends TextView { | |
| public ShadowTextView(Context context, AttributeSet attrs) { | |
| super(context, attrs); | |
| final TypedArray attributes = context.obtainStyledAttributes(attrs, R.styleable.ShadowTextView); | |
| final float shadowRadius; | |
| final float shadowDx; | |
| final float shadowDy; | |
| final int shadowColor; | |
| try { | |
| final float shadowRadiusFromAttributes = attributes.getDimension(R.styleable.ShadowTextView_shadowRadius, 0f); | |
| shadowRadius = shadowRadiusFrom(shadowRadiusFromAttributes); | |
| shadowDx = attributes.getDimension(R.styleable.ShadowTextView_shadowDx, 0f); | |
| shadowDy = attributes.getDimension(R.styleable.ShadowTextView_shadowDy, 0f); | |
| shadowColor = attributes.getColor(R.styleable.ShadowTextView_shadowColor, 0); | |
| } finally { | |
| attributes.recycle(); | |
| } | |
| if (shadowColor != 0) { | |
| setShadowLayer(shadowRadius, shadowDx, shadowDy, shadowColor); | |
| } else { | |
| getPaint().clearShadowLayer(); | |
| } | |
| } | |
| private static float shadowRadiusFrom(float shadowRadiusFromAttributes) { | |
| // App can crash on some devices if shadow radius is more than 25 pixels | |
| // On Samsung Galaxy S6 this crash happens when you copy a text from an input field | |
| // https://stackoverflow.com/questions/4866928/ranges-for-radius-in-shadowradius-and-visiblity-in-textview?lq=1 | |
| final float radiusCapped = Math.min(shadowRadiusFromAttributes, 25f); | |
| // Threat radius between 0 and 1 pixels as 1 pixel to prevent | |
| // unexpected shadow loss on lower-dpi devices. | |
| final float radius; | |
| if (radiusCapped > 0f && radiusCapped < 1f) { | |
| radius = 1f; | |
| } else { | |
| radius = radiusCapped; | |
| } | |
| return radius; | |
| } | |
| } |
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