圆形

1. import android.graphics.Bitmap;
2. import android.graphics.BitmapShader;
3. import android.graphics.Canvas;
4. import android.graphics.Paint;
5. import com.squareup.picasso.Transformation;
6. ``
7. public class CircleTransform implements Transformation {
8. @Override
9. public Bitmap transform(Bitmap source) {
10. int size = Math.min(source.getWidth(), source.getHeight());
11. int x = (source.getWidth() - size) / 2;
12. int y = (source.getHeight() - size) / 2;
13. Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
14. if (squaredBitmap != source) {
15. source.recycle();
16. }
17. Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig());
18. Canvas canvas = new Canvas(bitmap);
19. Paint paint = new Paint();
20. BitmapShader shader = new BitmapShader(squaredBitmap, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
21. paint.setShader(shader);
22. paint.setAntiAlias(true);
23. float r = size / 2f;
24. canvas.drawCircle(r, r, r, paint);
25. squaredBitmap.recycle();
26. return bitmap;
27. }
28. ``
29. @Override
30. public String key() {
31. return "circle";
32. }
33. }

圆角

1. import android.graphics.Bitmap;
2. import android.graphics.BitmapShader;
3. import android.graphics.Canvas;
4. import android.graphics.Paint;
5. import android.graphics.RectF;
6. import android.graphics.Shader;
7. ``
8. public class RoundedTransformation implements com.squareup.picasso.Transformation {
9. private final int radius;
10. private final int margin;
11. public RoundedTransformation(final int radius, final int margin) {
12. this.radius = radius;
13. this.margin = margin;
14. }
15. @Override
16. public Bitmap transform(final Bitmap source) {
17. final Paint paint = new Paint();
18. paint.setAntiAlias(true);
19. paint.setShader(new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP));
20. Bitmap output = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
21. Canvas canvas = new Canvas(output);
22. canvas.drawRoundRect(new RectF(margin, margin, source.getWidth() - margin, source.getHeight() - margin), radius, radius, paint);
23. if (source != output) {
24. source.recycle();
25. }
26. return output;
27. }
28. ``
29. @Override
30. public String key() {
31. return "rounded";
32. }
33. }

多解释也没啥好解释的，拿去用就好了_{希望可以帮到你}