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Practice02RadialGradientView.java
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Practice02RadialGradientView.java
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package com.geekholt.practiceui.view.lesson2;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RadialGradient;
import android.graphics.Shader;
import android.graphics.SweepGradient;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
public class Practice02RadialGradientView extends View {
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
public Practice02RadialGradientView(Context context) {
this(context, null);
}
public Practice02RadialGradientView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public Practice02RadialGradientView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
{
// 用 Paint.setShader(shader) 设置一个 RadialGradient
// RadialGradient 的参数:圆心坐标:(300, 300);半径:200;颜色:#E91E63 到 #2196F3
Shader shader = new RadialGradient(300, 300, 200,
Color.parseColor("#E91E63"), Color.parseColor("#2196F3"), Shader.TileMode.CLAMP);
paint.setShader(shader);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawCircle(300, 300, 200, paint);
}
}