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Practice07ColorMatrixColorFilterView.java
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Practice07ColorMatrixColorFilterView.java
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package com.geekholt.practiceui.view.lesson2;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import com.geekholt.practiceui.R;
public class Practice07ColorMatrixColorFilterView extends View {
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
Bitmap bitmap;
public Practice07ColorMatrixColorFilterView(Context context) {
super(context);
}
public Practice07ColorMatrixColorFilterView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public Practice07ColorMatrixColorFilterView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
{
bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.batman);
// 使用 setColorFilter() 设置一个 ColorMatrixColorFilter
// 用 ColorMatrix.setSaturation() 把饱和度去掉
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.setSaturation(0f);
ColorMatrixColorFilter colorFilter = new ColorMatrixColorFilter(colorMatrix);
paint.setColorFilter(colorFilter);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawBitmap(bitmap, 0, 0, paint);
}
}