Android imageview设置圆角

顶部左右圆角

四角都圆角

1：写一个自定义图片控件直接引用即可

/**
 * date:2020/7/16
 * author: wsm(Administrator)
 * function:
 */
public class RadiuImageView extends AppCompatImageView {
    private float width, height;
    private int defaultRadius = 0;
    private int radius;
    private int leftTopRadius;
    private int rightTopRadius;
    private int rightBottomRadius;
    private int leftBottomRadius;


    public RadiuImageView(Context context) {
        this(context, null);
        init(context, null);
    }

    public RadiuImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
        init(context, attrs);
    }

    public RadiuImageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context, attrs);
    }

    private void init(Context context, AttributeSet attrs) {
        if (Build.VERSION.SDK_INT < 18) {
            setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        }
        // 读取配置
        TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.RoundCornerImageView);
        radius = array.getDimensionPixelOffset(R.styleable.RoundCornerImageView_radius, defaultRadius);
        leftTopRadius = array.getDimensionPixelOffset(R.styleable.RoundCornerImageView_left_top_radius, defaultRadius);
        rightTopRadius = array.getDimensionPixelOffset(R.styleable.RoundCornerImageView_right_top_radius, defaultRadius);
        rightBottomRadius = array.getDimensionPixelOffset(R.styleable.RoundCornerImageView_right_bottom_radius, defaultRadius);
        leftBottomRadius = array.getDimensionPixelOffset(R.styleable.RoundCornerImageView_left_bottom_radius, defaultRadius);


        //如果四个角的值没有设置，那么就使用通用的radius的值。
        if (defaultRadius == leftTopRadius) {
            leftTopRadius = radius;
        }
        if (defaultRadius == rightTopRadius) {
            rightTopRadius = radius;
        }
        if (defaultRadius == rightBottomRadius) {
            rightBottomRadius = radius;
        }
        if (defaultRadius == leftBottomRadius) {
            leftBottomRadius = radius;
        }
        array.recycle();
    }


    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        width = getWidth();
        height = getHeight();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        //这里做下判断，只有图片的宽高大于设置的圆角距离的时候才进行裁剪
        int maxLeft = Math.max(leftTopRadius, leftBottomRadius);
        int maxRight = Math.max(rightTopRadius, rightBottomRadius);
        int minWidth = maxLeft + maxRight;
        int maxTop = Math.max(leftTopRadius, rightTopRadius);
        int maxBottom = Math.max(leftBottomRadius, rightBottomRadius);
        int minHeight = maxTop + maxBottom;
        if (width >= minWidth && height > minHeight) {
            Path path = new Path();
            //四个角：右上，右下，左下，左上
            path.moveTo(leftTopRadius, 0);
            path.lineTo(width - rightTopRadius, 0);
            path.quadTo(width, 0, width, rightTopRadius);

            path.lineTo(width, height - rightBottomRadius);
            path.quadTo(width, height, width - rightBottomRadius, height);

            path.lineTo(leftBottomRadius, height);
            path.quadTo(0, height, 0, height - leftBottomRadius);

            path.lineTo(0, leftTopRadius);
            path.quadTo(0, 0, leftTopRadius, 0);

            canvas.clipPath(path);
        }
        super.onDraw(canvas);
    }

}

2：attrs中加入

<declare-styleable name="RoundCornerImageView">
        <attr name="radius" format="dimension" />
        <attr name="left_top_radius" format="dimension" />
        <attr name="right_top_radius" format="dimension" />
        <attr name="right_bottom_radius" format="dimension" />
        <attr name="left_bottom_radius" format="dimension" />
    </declare-styleable>

3：布局中直接引入并设置即可

  <这里是你创建自定义view的包名.RadiuImageView
                android:id="@+id/rmd_img"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="fitXY"
                app:radius="5dp"//这里是四个角都圆角5dp，单独设置引入attrs中即可，比如左上右上角设置 app:left_top_radius="5dp"
            app:right_top_radius="5dp"就可以
                />