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Android實現簡單旋轉動畫_Android

作者：Android-kongqw ? 更新時間： 2022-09-13 編程語言

本文實例為大家分享了Android實現簡單旋轉動畫的具體代碼，供大家參考，具體內容如下

核心方法

public void startAnimation(Animation animation)

執行動畫，參數可以是各種動畫的對象，Animation的多態，也可以是組合動畫，后面會有。

2個參數的構造方法

/**
?* 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;
}
  • 第一個參數是圖片旋轉的起始度數
  • 第二個參數是圖片旋轉結束的度數

用法

RotateAnimation ta = new RotateAnimation(0, 360);
// 設置動畫播放的時間
ta.setDuration(1000);
// 開始播放動畫
iv.startAnimation(ta);

效果

以圖片左上角為旋轉中心，順時針旋轉360度

4個參數的構造方法

/**
? ? ?* 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();
? ? }
  • 頭兩個參數和上面兩個參數的構造方法一樣，是開始和結束的角度
  • 后兩個參數是設置圖片的旋轉中心

用法

RotateAnimation ta = new RotateAnimation(0, 360, iv.getWidth() / 2, iv.getHeight() / 2);
// 設置動畫播放的時間
ta.setDuration(1000);
// 開始播放動畫
iv.startAnimation(ta);

效果

以圖片中心為旋轉中心，順時針旋轉360度

6個參數的構造方法

/**
* 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();
}

比4個參數的構造方法多了第三個和第五個參數，其他用法一樣，第三個和四五個參數分別設置第四個和第六個參數的類型，四個參數的構造沒有設置，是默認設置了Animation.ABSOLUTE類型

用法

// 創建旋轉的動畫對象
RotateAnimation ta = new RotateAnimation(0, 360, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
// 設置動畫播放的時間
ta.setDuration(1000);
// 開始播放動畫
iv.startAnimation(ta);

效果

和上面一樣，以圖片中心為旋轉中心，順時針旋轉360度。

設置動畫重復播放的次數的方法

/**
?* 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;
}

使用

sa.setRepeatCount(2);

一直重復

sa.setRepeatCount(Animation.INFINITE);

設置動畫重復播放的模式的方法

/**
?* 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;
}

使用

sa.setRepeatMode(ScaleAnimation.REVERSE);

動畫的監聽

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

? ? ? ? ? ? }
?});

原文鏈接：https://blog.csdn.net/q4878802/article/details/47085187

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