如何在画布中旋转圆形动画

Question

我想在 android 上的画布中连续旋转圆圈。我正在使用画布绘制圆圈并且我正在连续旋转圆圈。这是可能的，如果可能的话，如何使用代码或示例来帮助我，非常感谢！

这是我在画布上绘制圆圈的代码：

    import android.app.Activity;
    import android.content.Context;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.os.Bundle;
    import android.view.View;

    public class AnimationActivity extends Activity {
        /** Called when the activity is first created. */
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(new SampleView(this));
        }


    public class SampleView extends View
    {
        public SampleView(Context context)
        {
            super(context);
            // TODO Auto-generated constructor stub
        }

        @Override
        protected void onDraw(Canvas canvas)
        {
             Paint mPaint = new Paint();
             mPaint.setStyle(Paint.Style.STROKE);
             mPaint.setStrokeWidth(10);
             mPaint.setColor(Color.RED);
             canvas.drawCircle(75, 75, 75, mPaint);
        }
    }
  }

提前致谢！

Answer 1

canvas.rotate(-rotate_angle, rotate_center_x, rotate_center_y);
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.RED);
RectF oval3 = new RectF(rotate_center_x-150, rotate_center_y-50, rotate_center_x+150, rotate_center_y+50);
canvas.drawOval(oval3, paint);
//resume original angle
canvas.rotate(rotate_angle, rotate_center_x, rotate_center_y);

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