我正在使用一个自定义TextView来垂直绘制文本,一个来自MPAndroidCharts库的图形以及该图形顶部的textview。虽然它在屏幕上看起来不错,但是当我尝试获取它的位图以便可以将其共享为图像时,垂直文本视图的获取并没有完全绘制出来。
我的视图XML是以下内容:
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:id="@+id/clWeatherCharts">
<TextView
android:id="@+id/txtWeatherTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_margin="@dimen/margin_16dp"
android:text="@string/temperature_registers"
android:textAlignment="center"/>
<com.shadows.naylapp.utils.VerticalTextView
android:id="@+id/llYEnvironment"
android:textColor="@color/colorBlack"
android:textSize="14sp"
android:layout_width="20dp"
android:layout_height="0dp"
android:text="Temperatura Superficial del Mar (Cº)"
android:layout_margin="@dimen/padding_8dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@id/lineWeatherChart"
app:layout_constraintBottom_toBottomOf="@id/lineWeatherChart"
/>
<com.github.mikephil.charting.charts.LineChart
android:id="@+id/lineWeatherChart"
android:layout_marginTop="@dimen/margin_16dp"
android:layout_width="0dp"
android:layout_height="300dp"
app:layout_constraintEnd_toStartOf="@id/llYWindEnvironment"
app:layout_constraintStart_toEndOf="@id/llYEnvironment"
app:layout_constraintTop_toBottomOf="@id/txtWeatherTitle" />
<LinearLayout
android:id="@+id/llYWindEnvironment"
android:layout_width="20dp"
android:layout_height="0dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="@id/lineWeatherChart"
app:layout_constraintBottom_toBottomOf="@id/lineWeatherChart">
<com.shadows.naylapp.utils.VerticalTextView
android:textColor="@color/colorBlack"
android:textSize="14sp"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="Velocidad del Viento (Km/hr)"
/>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
我正在使用扩展功能来创建以下位图:
fun View.getBitmapFromView(): Bitmap? {
val bitmap = Bitmap.createBitmap(this.width, this.height, Bitmap.Config.ARGB_8888)
val canvas = Canvas(bitmap)
canvas.drawColor(Color.WHITE)
this.draw(canvas)
return bitmap
}
我这样称呼它: clWeatherCharts.getBitmapFromView()
垂直文本视图的代码如下:
class VerticalTextView(context: Context, attrs: AttributeSet) : AppCompatTextView(context, attrs) {
private val topDown = gravity.let { g ->
!(Gravity.isVertical(g) && g.and(Gravity.VERTICAL_GRAVITY_MASK) == Gravity.TOP)
}
private val metrics = BoringLayout.Metrics()
private var padLeft = 0
private var padTop = 0
private var layout1: Layout? = null
override fun setText(text: CharSequence, type: BufferType) {
super.setText(text, type)
layout1 = null
}
private fun makeLayout(): Layout {
if (layout1 == null) {
metrics.width = height
paint.color = currentTextColor
paint.drawableState = drawableState
layout1 = BoringLayout.make(text, paint, metrics.width, Layout.Alignment.ALIGN_NORMAL, 2f, 0f, metrics, false, TextUtils.TruncateAt.MIDDLE, height - compoundPaddingLeft - compoundPaddingRight)
padLeft = compoundPaddingLeft
padTop = extendedPaddingTop
}
return layout1!!
}
override fun onDraw(c: Canvas) {
// c.drawColor(0xffffff80); // TEST
if (layout == null)
return
c.withSave {
if (topDown) {
val fm = paint.fontMetrics
translate(textSize - (fm.bottom + fm.descent), 0f)
rotate(90f)
} else {
translate(textSize, height.toFloat())
rotate(-90f)
}
translate(padLeft.toFloat(), padTop.toFloat())
makeLayout().draw(this)
}
}
}
我已经尝试过在textviews上放置一些填充或居中放置文本,并且在获取位图时会被裁剪得更多。
任何帮助表示赞赏!
解决方案
你可以遍历ConstraintLayout中的每个子项,然后使用Bitmap.drawBitmap(Bitmap,int,int,Paint)绘制子项的内容。
// Get bitmap from a View
fun View.getBitmapFromView(): Bitmap? {
val bitmap = Bitmap.createBitmap(this.width, this.height, Bitmap.Config.ARGB_8888)
val canvas = Canvas(bitmap)
draw(canvas)
return bitmap
}
// Get bitmap from a ConstraintLayout
fun ConstraintLayout.getBitmapFromView(): Bitmap {
val bitmap = Bitmap.createBitmap(this.width, this.height, Bitmap.Config.ARGB_8888)
val canvas = Canvas(bitmap)
canvas.drawColor(Color.WHITE)
for (i in 0 until childCount) {
val child = getChildAt(i)
val childBitmap = child.getBitmapFromView()
if (childBitmap != null) {
canvas.drawBitmap(childBitmap, child.left.toFloat(), child.top.toFloat(), null)
}
}
return bitmap
}
从代码使用
clWeatherCharts.getBitmapFromView()
惊人!它就像一个魅力!