Android 圆角ImageView_themeutils: view class com.feinnoui.library.ui.vie-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_26446715/article/details/104313394

该博客介绍了如何在Android中创建一个自定义的RoundedImagView组件，通过覆盖draw方法并使用Paint和Path来绘制四个角落的圆角。代码示例详细展示了如何为每个角落画出弧形，并提供了设置圆角大小的方法。

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import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.util.AttributeSet;

import androidx.annotation.Nullable;
import androidx.appcompat.widget.AppCompatImageView;

public class RoundedImagView extends AppCompatImageView {

    private int cornerSize = 30;

    private Paint paint;

    public RoundedImagView(Context context) {
        super(context);
        paint = new Paint();
        paint.setColor(Color.WHITE);
        paint.setAntiAlias(true);//消除锯齿
    }

    public RoundedImagView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        paint = new Paint();
        paint.setColor(Color.WHITE);
        paint.setAntiAlias(true);//消除锯齿
    }

    @Override
    public void draw(Canvas canvas) {
        super.draw(canvas);
        drawLeftTop(canvas);
        drawRightTop(canvas);
        drawLeftBottom(canvas);
        drawRightBottom(canvas);
    }

    private void drawLeftTop(Canvas canvas) {
        Path path = new Path();
        path.moveTo(0, cornerSize);
        path.lineTo(0, 0);
        path.lineTo(cornerSize, 0);
        path.arcTo(new RectF(0, 0, cornerSize * 2, cornerSize * 2), -90, -90);
        path.close();
        canvas.drawPath(path, paint);
    }

    private void drawLeftBottom(Canvas canvas) {
        Path path = new Path();
        path.moveTo(0, getHeight() - cornerSize);
        path.lineTo(0, getHeight());
        path.lineTo(cornerSize, getHeight());
        path.arcTo(new RectF(0, // x
                getHeight() - cornerSize * 2,// y
                cornerSize * 2,// x
                getHeight()// getWidth()// y
        ), 90, 90);
        path.close();
        canvas.drawPath(path, paint);
    }

    private void drawRightBottom(Canvas canvas) {
        Path path = new Path();
        path.moveTo(getWidth() - cornerSize, getHeight());
        path.lineTo(getWidth(), getHeight());
        path.lineTo(getWidth(), getHeight() - cornerSize);
        RectF oval = new RectF(getWidth() - cornerSize * 2, getHeight()
                - cornerSize * 2, getWidth(), getHeight());
        path.arcTo(oval, 0, 90);
        path.close();
        canvas.drawPath(path, paint);
    }

    private void drawRightTop(Canvas canvas) {
        Path path = new Path();
        path.moveTo(getWidth(), cornerSize);
        path.lineTo(getWidth(), 0);
        path.lineTo(getWidth() - cornerSize, 0);
        path.arcTo(new RectF(getWidth() - cornerSize * 2, 0, getWidth(),
                0 + cornerSize * 2), -90, 90);
        path.close();
        canvas.drawPath(path, paint);
    }

    public int getCornerSize() {
        return cornerSize;
    }

    public void setCornerSize(int cornerSize) {
        this.cornerSize = cornerSize;
    }

}