Android 设置图片为圆角或者圆形

亦凉 2022-10-15 11:59 120阅读 0赞

自己写了一个工具类，使用自定义view，设置图片为圆角，当rect_adius=100时，圆角就会变成圆形

  1. public class RoundImageView extends AppCompatImageView {
  2.     private final RectF roundRect = new RectF();
  3.     private float rect_adius = 10;
  4.     private final Paint maskPaint = new Paint();
  5.     private final Paint zonePaint = new Paint();
  7.     public RoundImageView(Context context, AttributeSet attrs) {
  8.         super(context, attrs);
  9.         TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundImageView);
  10.         //根据属性名称获取对应的值，属性名称的格式为类名_属性名
  11.         rect_adius = typedArray.getFloat(R.styleable.RoundImageView_rect_adius, 10f);
  12.         init();
  13.     }
  15.     public RoundImageView(Context context) {
  16.         super(context);
  17.         init();
  18.     }
  20.     private void init() {
  21.         maskPaint.setAntiAlias(true);
  22.         maskPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
  23.         zonePaint.setAntiAlias(true);
  24.         zonePaint.setColor(Color.WHITE);
  25.         float density = getResources().getDisplayMetrics().density;
  26.         rect_adius = rect_adius * density;
  27.     }
  29.     public void setRectAdius(float adius) {
  30.         rect_adius = adius;
  31.         invalidate();
  32.     }
  34.     @Override
  35.     protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
  36.         super.onLayout(changed, left, top, right, bottom);
  37.         int w = getWidth();
  38.         int h = getHeight();
  39.         roundRect.set(0, 0, w, h);
  40.     }
  42.     @Override
  43.     public void draw(Canvas canvas) {
  44.         canvas.saveLayer(roundRect, zonePaint, Canvas.ALL_SAVE_FLAG);
  45.         canvas.drawRoundRect(roundRect, rect_adius, rect_adius, zonePaint);
  46.         canvas.saveLayer(roundRect, maskPaint, Canvas.ALL_SAVE_FLAG);
  47.         super.draw(canvas);
  48.         canvas.restore();
  50.     }
  51. }

在styles中添加

  1. <declare-styleable name="RoundImageView">
  2.         <attr name="rect_adius" format="float" />
  3.     </declare-styleable>

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