自定义圆角ImageView

最新推荐文章于 2024-05-17 17:32:28 发布

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最新推荐文章于 2024-05-17 17:32:28 发布

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本文链接：https://blog.youkuaiyun.com/wp_do/article/details/103767984

本文介绍了一种自定义的圆角ImageView控件的实现方法，该控件使用了Android的Canvas和Path来绘制圆角，适用于需要美观显示图片的应用场景。通过设置圆角宽度和高度，可以灵活调整图片的圆角效果。

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imageview.setImageSource();

package com.het.c_sleep.common.widget;


import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.support.v7.widget.AppCompatImageView;
import android.util.AttributeSet;
import android.widget.ImageView;

import com.het.c_sleep.common.util.ScreenUtils;


public class RoundAngleImageView extends AppCompatImageView {

    private Paint paint;
    private int roundWidth;
    private int roundHeight;
    private Paint paint2;

    public RoundAngleImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context, attrs);
    }

    public RoundAngleImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs);
    }

    public RoundAngleImageView(Context context) {
        super(context);
        roundWidth = ScreenUtils.dp2px(context, 5);
        roundHeight = ScreenUtils.dp2px(context, 5);
        init(context, null);
    }

    private void init(Context context, AttributeSet attrs) {
        paint = new Paint();
        paint.setColor(Color.WHITE);
        paint.setAntiAlias(true);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
        paint2 = new Paint();
        paint2.setXfermode(null);
    }

    @Override
    public void draw(Canvas canvas) {
        Bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas2 = new Canvas(bitmap);
        super.draw(canvas2);
        drawLiftUp(canvas2);
        drawRightUp(canvas2);
        drawLiftDown(canvas2);
        drawRightDown(canvas2);
        canvas.drawBitmap(bitmap, 0, 0, paint2);
        bitmap.recycle();
    }

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

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

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

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

}