imageView创建圆形头像

最新推荐文章于 2025-01-11 08:13:03 发布

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本文介绍了一个将图片转换为带有圆角边框的方法。通过使用Android的Bitmap和Canvas类，可以实现图片的圆角效果。该过程包括创建一个空白的Bitmap，并在上面绘制带有圆角的矩形区域，随后通过特定的模式将原始图片与这个带有圆角的透明背景相结合。

public class MainActivity extends Activity {
private ImageView image;
@Override
public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      image=(ImageView)findViewById(R.id.image);

      Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.bt);
   Bitmap output=toRoundCorner(bitmap, 15.0f);
      image.setImageBitmap(output);
}
public static Bitmap toRoundCorner(Bitmap bitmap, float pixels) {
        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
      Canvas canvas = new Canvas(output);

      final int color = 0xff424242;
      final Paint paint = new Paint();
      final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
      final RectF rectF = new RectF(rect);
      final float roundPx = pixels;

      paint.setAntiAlias(true);
      canvas.drawARGB(0, 0, 0, 0);

      paint.setColor(color);
      canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
      paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
      canvas.drawBitmap(bitmap, rect, rect, paint);
      System.out.println("pixels+++++++"+pixels);


      return output;
}
}