android - View 的屏幕截图与 View 的大小不同吗？

Question

所以，我试图模糊我的ContraintLayout我采取的方法是

截取根 View 的屏幕截图。

在根 View 中添加ImageView，其布局参数为MATCH_PARENT和MATCH_PARENT。

模糊该屏幕快照

将屏幕快照位图设置为此ImageView。

但是它没有按预期工作。任何帮助，将不胜感激。
这是我正在使用的一些相关代码。

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val imageView = ImageView(this)
        val param = ConstraintLayout.LayoutParams(
            ConstraintLayout.LayoutParams.MATCH_PARENT,
            ConstraintLayout.LayoutParams.MATCH_PARENT
        )
        imageView.layoutParams = param
        val bit = convertViewToBitmap(root)
        val blurred = blur(bit,25F)
        imageView.setImageBitmap(blurred)
        root.addView(imageView)
    }

获取 View 的屏幕截图

private fun convertViewToBitmap(view: View): Bitmap {
        val spec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)
        view.measure(spec, spec)
        view.layout(0, 0, view.measuredWidth, view.measuredHeight)
        val b = Bitmap.createBitmap(view.measuredWidth, view.measuredHeight,
            Bitmap.Config.ARGB_8888)
        val c = Canvas(b)
        //c.translate((-view.scrollX).toFloat(), (-view.scrollY).toFloat())
        view.draw(c)
        return b
    }

要模糊该ScreenShot

 var times = 0

    fun blur(bitmap: Bitmap, radius: Float): Bitmap? {
        val renderScript = RenderScript.create(this)
        val blurredBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true)
        val input: Allocation = Allocation.createFromBitmap(
            renderScript,
            blurredBitmap,
            Allocation.MipmapControl.MIPMAP_FULL,
            Allocation.USAGE_SHARED
        )
        val output: Allocation = Allocation.createTyped(renderScript, input.type)
        // Load up an instance of the specific script that we want to use.
        ScriptIntrinsicBlur.create(renderScript, Element.U8_4(renderScript)).apply {
            setInput(input)
            setRadius(radius)
            forEach(output)
        }
        output.copyTo(blurredBitmap)
        if (times < 5) {
            times += 1
            blur(blurredBitmap, radius)
        }
        return blurredBitmap
    }

这是XML文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/root"
    android:background="@android:color/white"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.20" />

</androidx.constraintlayout.widget.ConstraintLayout>

这是结果

Answer 1

而不是采取 View 的屏幕截图并使其模糊。试试这个:

使用TextView模糊BlueMaskFilter

 float radius = yourTextView.getTextSize() / 3; 
 BlurMaskFilter filter = new BlurMaskFilter(radius, BlurMaskFilter.Blur.NORMAL);
 yourTextView.getPaint().setMaskFilter(filter);

将模糊的TextView转换为BitMap并将其设置为ImageView位图