Android 自定义ImageView，支持圆角和直角
16lz
2021-01-23
使用自定义ImageView，实现圆角功能
1.自定义属性attrs.xml
<?xml version="1.0" encoding="utf-8"?> 2.自定义RoundCornerImageView，继承AppCompatImageView
public class RoundCornerImageView 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 RoundCornerImageView(Context context) { this(context, null); init(context, null); } public RoundCornerImageView(Context context, AttributeSet attrs) { this(context, attrs, 0); init(context, attrs); } public RoundCornerImageView(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); }}3.布局文件中使用
<?xml version="1.0" encoding="utf-8"?> 4.调用
public class MainActivity extends AppCompatActivity { String avatarUrl = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1516644385815&di=c0552674db9f07a5f889d7c0980e33db&imgtype=0&src=http%3A%2F%2Fimg.mp.itc.cn%2Fupload%2F20170529%2F83d3ce719e9d4c0a8f1cd033ecac3692_th.jpg"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ImageView ivAvatar = findViewById(R.id.iv_avatar); Glide.with(this).load(avatarUrl).into(ivAvatar); }}更多相关文章
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