Example of Android programming to implement rounded rectangles with gradient effect

/**
  * Rounded rectangle with gradient effect
  *
  * @description:
  * @author ldm
  * @date 2016-4-26 3:47:12 pm
  */
public class RoundRectsActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    (savedInstanceState);
    setContentView(new RoundRectView(this));
  }
  private static class RoundRectView extends View {
    // The Rect class is mainly used to represent a rectangular area in the coordinate system    private Rect mRect;
    // GradientDrawable supports the use of gradient colors to draw graphics, which can usually be used as a Button or background graphics.    private GradientDrawable mDrawable;
    public RoundRectView(Context context) {
      super(context);
      setFocusable(true);
      initView();
    }
    /**
      * Initialize data
      *
      * @description:
      * @author ldm
      * @date 2016-4-26 3:56:06 pm
      */
    private void initView() {
      mRect = new Rect(0, 0, 240, 240);
      // Orientation specifies the direction of the gradient, int[]colors specifies that the color of the gradient is specified by the colors array, and each value in the array is a color.      mDrawable = new GradientDrawable(
          .TL_BR, new int[] { 0xFFFF0000,
              0xFF00FF00, 0xFF0000FF });
      // Set the shape of the Drawable to a rectangle      ();
      // Set the radius of the gradient      ((float) ((2) * 120));
    }
    /**
      * Set the four corners and round radii of the picture
      *
      * @description:
      * @author ldm
      * @date 2016-4-26 4:08:17 pm
      */
    static void setCornersRadii(GradientDrawable drawable, float r0,
        float r1, float r2, float r3) {
      // Set the circular radius of the four corners of the picture: 1 and 2 parameters represent the upper left corner, 3 and 4 represent the upper right corner, 5 and 6 represent the lower right corner, 7 and 8 represent the lower left corner      (new float[] { r0, r0, r1, r1, r2, r2, r3,
          r3 });
    }
    @Override
    protected void onDraw(Canvas canvas) {
      (mRect);
      float r = 16;
      ();
      (10, 10);//Picture translation      // Set gradient mode: linear gradient      (GradientDrawable.LINEAR_GRADIENT);
      setCornersRadii(mDrawable, r, r, 0, 0);
      (canvas);
      ();
      ();
      (10 + () + 10, 10);
      // Set gradient mode: diameter drawing gradient      (GradientDrawable.RADIAL_GRADIENT);
      setCornersRadii(mDrawable, 0, 0, r, r);
      (canvas);
      ();
      (0, () + 10);
      ();
      (10, 10);
      // Set the gradient mode: the color gradient direction is not ring-shaped, but swept through the fan-shaped shape with a point as the center.      (GradientDrawable.SWEEP_GRADIENT);
      setCornersRadii(mDrawable, 0, r, r, 0);
      (canvas);
      ();
      ();
      (10 + () + 10, 10);
      (GradientDrawable.LINEAR_GRADIENT);
      setCornersRadii(mDrawable, r, 0, 0, r);
      (canvas);
      ();
      (0, () + 10);
      ();
      (10, 10);
      (GradientDrawable.RADIAL_GRADIENT);
      setCornersRadii(mDrawable, r, 0, r, 0);
      (canvas);
      ();
      ();
      (10 + () + 10, 10);
      (GradientDrawable.SWEEP_GRADIENT);
      setCornersRadii(mDrawable, 0, r, 0, r);
      (canvas);
      ();
    }
  }
}