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我知道要在画布中绘制位图,我们需要为全屏图像调用canvas.drawBitmap(filterBitmap,0f,0f,paint)。 但我culdn't aderstend为什么我的代码不起作用,我的ImageView是空的。Canvas绘制位图?)
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val bitmap = BitmapFactory.decodeResource(resources, R.drawable.grass)
val filterBitmap = Bitmap.createBitmap(bitmap.width, bitmap.height, bitmap.config)
val paint = Paint().apply {
color = Color.RED
style = Paint.Style.FILL
}
val canvas = Canvas(filterBitmap)
canvas.drawBitmap(filterBitmap, 0f, 0f, paint)
filter_image.setImageBitmap(filterBitmap)
}
Drawble国土资源具有高度和宽度