效果圖
原圖
過濾藍光
反色
主要代碼
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
filterBlueLightBtn.setOnClickListener { filterBlueLight() }
reverseColorBtn.setOnClickListener { reverseColor() }
resumeBtn.setOnClickListener { resumeColor() }
}
/**
* 反色
*/
private fun reverseColor() {
val paint = Paint()
val cm = ColorMatrix(floatArrayOf(
-1f, 0f, 0f, 0f, 255f,
0f, -1f, 0f, 0f, 255f,
0f, 0f, -1f, 0f, 255f,
0f, 0f, 0f, 1f, 0f))
paint.colorFilter = ColorMatrixColorFilter(cm)
window.decorView.setLayerType(View.LAYER_TYPE_HARDWARE, paint)
}
/**
* 過濾藍光
*/
private fun filterBlueLight() {
val paint = Paint()
// 把藍色減弱為原來的0.7
val cm = ColorMatrix(floatArrayOf(
1f, 0f, 0f, 0f, 0f,
0f, 1f, 0f, 0f, 0f,
0f, 0f, 0.7f, 0f, 0f,
0f, 0f, 0f, 1f, 0f))
paint.colorFilter = ColorMatrixColorFilter(cm)
window.decorView.setLayerType(View.LAYER_TYPE_HARDWARE, paint)
}
/**
* 恢復(fù)
*/
private fun resumeColor() {
window.decorView.setLayerType(View.LAYER_TYPE_HARDWARE, Paint())
}
}
完整源代碼
https://gitee.com/cxyzy1/ColorMatrixColorFilterDemo
附錄
這種方式是基于view做的修改,也可直接針對ImageView設(shè)置顏色過濾器,詳見:http://www.reibang.com/p/f1f93a37738b
