如何在 Android 中撤消 TextView 上的蒙版滤镜模糊

Question

我使用 here 中的代码模糊了一些文本：

    val radius = msgText.getTextSize() / 3
    val mTextFilter = BlurMaskFilter(radius, BlurMaskFilter.Blur.NORMAL)
    msgTextView.getPaint().setMaskFilter(mTextFilter)

...在某些时候我想撤消模糊所以我尝试了：

msgTextView.getPaint().setMaskFilter(null)

但这确实不会清除文本中的模糊，尽管它的描述是：

package android.graphics;

...

public class Paint {

...
/**
     * Set or clear the maskfilter object.
     * <p />
     * Pass null to clear any previous maskfilter.
     * As a convenience, the parameter passed is also returned.
     *
     * @param maskfilter May be null. The maskfilter to be installed in the
     *                   paint
     * @return           maskfilter
     */
    public MaskFilter setMaskFilter(MaskFilter maskfilter) {
        long maskfilterNative = 0;
        if (maskfilter != null) {
            maskfilterNative = maskfilter.native_instance;
        }
        nSetMaskFilter(mNativePaint, maskfilterNative);
        mMaskFilter = maskfilter;
        return maskfilter;
    }
...
}

所以我很困惑。有什么想法吗？

Answer 1

您的代码是完美的，只是您需要根据需要添加这些行！

设置模糊效果

val radius = msgText.getTextSize() / 3
val mTextFilter = BlurMaskFilter(radius, BlurMaskFilter.Blur.NORMAL)
msgTextView.getPaint().setMaskFilter(mTextFilter)

去除模糊效果

msgTextView.setLayerType(View.LAYER_TYPE_SOFTWARE,null);
// Clear any previous 
MaskFilter mTextView.getPaint().setMaskFilter(null);

应用内部模糊

applyBlurMaskFilter(mTextView, BlurMaskFilter.Blur.INNER);

应用外部模糊

applyBlurMaskFilter(mTextView, BlurMaskFilter.Blur.OUTER);

应用普通模糊

applyBlurMaskFilter(mTextView, BlurMaskFilter.Blur.NORMAL);

应用实体模糊

applyBlurMaskFilter(mTextView, BlurMaskFilter.Blur.SOLID);

这里applyBlurMaskFilter()是用户定义的方法。

如何在 Android 中撤消 TextView 上的蒙版滤镜模糊

How to undo a mask filter blur on a TextView in Android

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