Android实现简单旋转动画

public void startAnimation(Animation animation)

/**  * Constructor to use when building a RotateAnimation from code.  * Default pivotX/pivotY point is (0,0).  *   * @param fromDegrees Rotation offset to apply at the start of the animation.  * @param toDegrees Rotation offset to apply at the end of the animation.  */ public RotateAnimation(float fromDegrees, float toDegrees) {     mFromDegrees = fromDegrees;     mToDegrees = toDegrees;     mPivotX = 0.0f;     mPivotY = 0.0f; }

RotateAnimation ta = new RotateAnimation(0, 360); // 设置动画播放的时间 ta.setDuration(1000); // 开始播放动画 iv.startAnimation(ta);

/**      * Constructor to use when building a RotateAnimation from code      *       * @param fromDegrees Rotation offset to apply at the start of the animation.      * @param toDegrees Rotation offset to apply at the end of the animation.      * @param pivotX The X coordinate of the point about which the object is being rotated, specified as an absolute number where 0 is the left edge.      * @param pivotY The Y coordinate of the point about which the object is being rotated, specified as an absolute number where 0 is the top edge.      */     public RotateAnimation(float fromDegrees, float toDegrees, float pivotX, float pivotY) {         mFromDegrees = fromDegrees;         mToDegrees = toDegrees;         mPivotXType = ABSOLUTE;         mPivotYType = ABSOLUTE;         mPivotXValue = pivotX;         mPivotYValue = pivotY;         initializePivotPoint();     }

RotateAnimation ta = new RotateAnimation(0, 360, iv.getWidth() / 2, iv.getHeight() / 2); // 设置动画播放的时间 ta.setDuration(1000); // 开始播放动画 iv.startAnimation(ta);

/** * Constructor to use when building a RotateAnimation from code *  * @param fromDegrees Rotation offset to apply at the start of the animation. * @param toDegrees Rotation offset to apply at the end of the animation. * @param pivotXType Specifies how pivotXValue should be interpreted. One of Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or Animation.RELATIVE_TO_PARENT. * @param pivotXValue The X coordinate of the point about which the object is being rotated, specified as an absolute number where 0 is the left edge. This value can either be an absolute number if pivotXType is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise. * @param pivotYType Specifies how pivotYValue should be interpreted. One of Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or Animation.RELATIVE_TO_PARENT. * @param pivotYValue The Y coordinate of the point about which the object is being rotated, specified as an absolute number where 0 is the top edge. This value can either be an absolute number if pivotYType is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise. */ public RotateAnimation(float fromDegrees, float toDegrees, int pivotXType, float pivotXValue, int pivotYType, float pivotYValue) {    mFromDegrees = fromDegrees;    mToDegrees = toDegrees;    mPivotXValue = pivotXValue;    mPivotXType = pivotXType;    mPivotYValue = pivotYValue;    mPivotYType = pivotYType;    initializePivotPoint(); }

// 创建旋转的动画对象 RotateAnimation ta = new RotateAnimation(0, 360, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f); // 设置动画播放的时间 ta.setDuration(1000); // 开始播放动画 iv.startAnimation(ta);

/**  * Sets how many times the animation should be repeated. If the repeat  * count is 0, the animation is never repeated. If the repeat count is  * greater than 0 or {@link #INFINITE}, the repeat mode will be taken  * into account. The repeat count is 0 by default.  *  * @param repeatCount the number of times the animation should be repeated  * @attr ref android.R.styleable#Animation_repeatCount  */ public void setRepeatCount(int repeatCount) {     if (repeatCount <0) {         repeatCount = INFINITE;     }     mRepeatCount = repeatCount; }

sa.setRepeatCount(2);

sa.setRepeatCount(Animation.INFINITE);

/**  * Defines what this animation should do when it reaches the end. This  * setting is applied only when the repeat count is either greater than  * 0 or {@link #INFINITE}. Defaults to {@link #RESTART}.   *  * @param repeatMode {@link #RESTART} or {@link #REVERSE}  * @attr ref android.R.styleable#Animation_repeatMode  */ public void setRepeatMode(int repeatMode) {     mRepeatMode = repeatMode; }

sa.setRepeatMode(ScaleAnimation.REVERSE);

rotateAnimation.setAnimationListener(new AnimationListener() {             @Override             public void onAnimationStart(Animation animation) {                 // TODO Auto-generated method stub             }             @Override             public void onAnimationRepeat(Animation animation) {                 // TODO Auto-generated method stub             }             @Override             public void onAnimationEnd(Animation animation) {                 // TODO Auto-generated method stub             }  });