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December 21, 2015 12:19
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If you has your own custom View who has a RotateDrawable and want to make it rotate, following code may help. The trick is to call Drawable.setLevel() on the drawable.
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private Drawable mLoadingDrawable; | |
private Transformation mTransformation; | |
private AlphaAnimation mAnimation; | |
private boolean mHasAnimation; | |
private Interpolator mInterpolator; | |
private long mLastDrawTime; | |
private static final int ANIMATION_RESOLUTION = 200; | |
private static final int MAX_LEVEL = 10000; | |
/** | |
* <p> | |
* Start the indeterminate progress animation. | |
* </p> | |
*/ | |
void startAnimation() { | |
if (getVisibility() != VISIBLE) { | |
return; | |
} | |
mHasAnimation = true; | |
if (mInterpolator == null) { | |
mInterpolator = new LinearInterpolator(); | |
} | |
if (mTransformation == null) { | |
mTransformation = new Transformation(); | |
} else { | |
mTransformation.clear(); | |
} | |
if (mAnimation == null) { | |
mAnimation = new AlphaAnimation(0.0f, 1.0f); | |
} else { | |
mAnimation.reset(); | |
} | |
mAnimation.setRepeatMode(Animation.RESTART); | |
mAnimation.setRepeatCount(Animation.INFINITE); | |
mAnimation.setDuration(3500); | |
mAnimation.setInterpolator(mInterpolator); | |
mAnimation.setStartTime(Animation.START_ON_FIRST_FRAME); | |
postInvalidate(); | |
} | |
/** | |
* <p> | |
* Stop the indeterminate progress animation. | |
* </p> | |
*/ | |
void stopAnimation() { | |
mHasAnimation = false; | |
postInvalidate(); | |
} | |
@Override | |
protected void onDraw(Canvas canvas) { | |
long time = getDrawingTime(); | |
if (mHasAnimation) { | |
mAnimation.getTransformation(time, mTransformation); | |
float scale = mTransformation.getAlpha(); | |
try { | |
mLoadingDrawable.setLevel((int) (scale * MAX_LEVEL)); | |
} finally { | |
} | |
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { | |
postInvalidateOnAnimation(); | |
} else if (SystemClock.uptimeMillis() - mLastDrawTime >= ANIMATION_RESOLUTION) { | |
mLastDrawTime = SystemClock.uptimeMillis(); | |
postInvalidateDelayed(ANIMATION_RESOLUTION); | |
} | |
} | |
super.onDraw(canvas); | |
} | |
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