Android实现图片设置圆角形式

本文实例为大家分享了android实现图片设置圆角形式的具体代码，供大家参考，具体内容如下

1.自定义的图片圆角形式circleimageview类

public class circleimageview extends imageview {
    private static final xfermode mask_xfermode;
    private bitmap mask;
    private paint paint;
    private int mborderwidth = 10;
    private int mbordercolor = color.parsecolor("#f2f2f2");
    private boolean usedefaultstyle = false;

    static {
        porterduff.mode localmode = porterduff.mode.dst_in;
        mask_xfermode = new porterduffxfermode(localmode);
    }

    public circleimageview(context context) {
        super(context);
    }

    public circleimageview(context context, attributeset attrs) {
        this(context, attrs, 0);
    }

    public circleimageview(context context, attributeset attrs, int defstyle) {
        super(context, attrs, defstyle);
        typedarray a = context.obtainstyledattributes(attrs, r.styleable.circularimage);
        mbordercolor = a.getcolor(r.styleable.circularimage_border_color, mbordercolor);
        final int def = (int) (2 * context.getresources().getdisplaymetrics().density + 0.5f);
        mborderwidth = a.getdimensionpixeloffset(r.styleable.circularimage_border_width, def);
        a.recycle();
    }

    private void usedefaultstyle(boolean usedefaultstyle) {
        this.usedefaultstyle = usedefaultstyle;
    }

    @override
    protected void ondraw(canvas canvas) {
        if (usedefaultstyle) {
            super.ondraw(canvas);
            return;
        }
        final drawable localdraw = getdrawable();
        if (localdraw == null) {
            return;
        }
        if (localdraw instanceof ninepatchdrawable) {
            return;
        }
        if (this.paint == null) {
            final paint localpaint = new paint();
            localpaint.setfilterbitmap(false);
            localpaint.setantialias(true);
            localpaint.setxfermode(mask_xfermode);
            this.paint = localpaint;
        }
        final int width = getwidth();
        final int height = getheight();
        /** 保存layer */
        int layer = canvas.savelayer(0.0f, 0.0f, width, height, null, 31);
        /** 设置drawable的大小 */
        localdraw.setbounds(0, 0, width, height);
        /** 将drawable绑定到bitmap(this.mask)上面（drawable只能通过bitmap显示出来） */
        localdraw.draw(canvas);
        if ((this.mask == null) || (this.mask.isrecycled())) {
            this.mask = createovalbitmap(width, height);
        }
        /** 将bitmap画到canvas上面 */
        canvas.drawbitmap(this.mask, 0.0f, 0.0f, this.paint);
        /** 将画布复制到layer上 */
        canvas.restoretocount(layer);
        drawborder(canvas, width, height);
    }

    /**
     * 绘制圆形边框
     */
    private void drawborder(canvas canvas, final int width, final int height) {
        if (mborderwidth == 0) {
            return;
        }
        final paint mborderpaint = new paint();
        mborderpaint.setstyle(paint.style.stroke);
        mborderpaint.setantialias(true);
        mborderpaint.setcolor(mbordercolor);
        mborderpaint.setstrokewidth(mborderwidth);
        canvas.drawcircle(width / 2, height / 2, (width - mborderwidth) / 2, mborderpaint);
        canvas = null;
    }

    public bitmap createovalbitmap(final int width, final int height) {
        bitmap.config localconfig = bitmap.config.argb_8888;
        bitmap localbitmap = bitmap.createbitmap(width, height, localconfig);
        canvas localcanvas = new canvas(localbitmap);
        paint localpaint = new paint();
        final int padding = (mborderwidth - 3) > 0 ? mborderwidth - 3 : 1;
        /**
         * 设置椭圆的大小(因为椭圆的最外边会和border的最外边重合的，如果图片最外边的颜色很深，有看出有棱边的效果，所以为了让体验更加好，
         * 让其缩进padding px)
         */
        rectf localrectf = new rectf(padding, padding, width - padding, height - padding);
        localcanvas.drawoval(localrectf, localpaint);
        return localbitmap;
    }
}

1.1 在values目录下创建一个circle_attr.xml，文件内容：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="circularimage">
        <attr name="border_width" format="dimension" />
        <attr name="border_color" format="color" />
    </declare-styleable>
</resources>

如下图：

2.activity_main.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <linearlayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <imageview
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:src="@drawable/ic_sp" />

        <com.demo.test.bitmap.circleimageview
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_marginleft="50dp"
            android:src="@drawable/ic_sp" />
    </linearlayout>
</linearlayout>

3.mainactivity.java

public class mainactivity extends appcompatactivity {

    @override
    protected void oncreate(bundle savedinstancestate) {
        super.oncreate(savedinstancestate);
        setcontentview(r.layout.activity_main);
    }
}

运行后结果：

 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。