Bitmap Canvas Color Gradient linear radial sweep rounded corner Android example
public class MainActivity extends Activity {
// //www.apache.org/licenses/LICENSE-2.0
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private Rect mRect;
private GradientDrawable mDrawable;
public SampleView(Context context) {
super(context);
setFocusable(true);
mRect = new Rect(0, 0, 220, 120);
/* GradientDrawable.Orientation BL_TR draw the gradient from the bottom-left to the top-right
BOTTOM_TOP draw the gradient from the bottom to the top
BR_TL draw the gradient from the bottom-right to the top-left
LEFT_RIGHT draw the gradient from the left to the right
RIGHT_LEFT draw the gradient from the right to the left
TL_BR draw the gradient from the top-left to the bottom-right
TOP_BOTTOM draw the gradient from the top to the bottom
TR_BL draw the gradient from the top-right to the bottom-left
*/
mDrawable = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT,
new int[] { 0xFFFF0000, 0xFF00FF00,
0xFF0000FF });
mDrawable.setShape(GradientDrawable.RECTANGLE);
mDrawable.setGradientRadius((float)(Math.sqrt(2) * 60));
}
static void setCornerRadius(GradientDrawable drawable, float r0,
float r1, float r2, float r3) {
/* setCornerRadii
Specify radii for each of the 4 corners. For each corner,
the array contains 2 values, [X_radius, Y_radius].
The corners are ordered top-left, top-right, bottom-right,
bottom-left
*/
drawable.setCornerRadii(new float[] { r0, r0, r1, r1,
r2, r2, r3, r3 });
}
@Override protected void onDraw(Canvas canvas) {
mDrawable.setBounds(mRect);
float r = 35;
canvas.save();
canvas.translate(10, 10);
mDrawable.setGradientType(GradientDrawable.LINEAR_GRADIENT);
setCornerRadius(mDrawable, r, r, 0, 0);
mDrawable.draw(canvas);
canvas.restore();
canvas.translate(0, mRect.height() + 10);
canvas.save();
canvas.translate(10, 10);
mDrawable.setGradientType(GradientDrawable.RADIAL_GRADIENT);
setCornerRadius(mDrawable, 0, 0, r, r);
mDrawable.draw(canvas);
canvas.restore();
canvas.translate(0, mRect.height() + 10);
canvas.save();
canvas.translate(10, 10);
mDrawable.setGradientType(GradientDrawable.SWEEP_GRADIENT);
setCornerRadius(mDrawable, 0, r, r, 0);
mDrawable.draw(canvas);
canvas.restore();
}
}
}
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Editace: 2013-12-09 13:09:03
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Url:bitmap-canvas-color-gradient-linear-radial-sweep-rounded-corner-android-example