Android怎么实现图片设置圆角形式

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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：

如下图：

2.activity_main.xml

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：

感谢各位的阅读，以上就是"Android怎么实现图片设置圆角形式"的内容了，经过本文的学习后，相信大家对Android怎么实现图片设置圆角形式这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是，小编将为大家推送更多相关知识点的文章，欢迎关注！