Android 帧动画何时停止播放
16lz
2021-01-23
关于android帧动画没有提供结束播放的接口回调表示不理解,也许是基于播放动画的时候,系统在干其他事情,无法确切地保证动画在totalDuration时间内播放完毕等。如果有哪位前辈知道原因,请不吝指教。
尽管android没有为帧动画提供结束播放的接口,我们还是可以通过一些其他方式来做到。
方式一,当动画开始start之后,我们可以通过检测是否到达帧动画的最后一帧,来确定动画是否播完。这种方式可以保证动画播完。
方式二,重写AnimationDrawable,获得totalDuration,然后动画start之后的totalDuration,调用结束的接口回调onAnimationFinshed()。为什么必须重写呢?因为,AnimationDrawable仅提供了每一帧的duration,而不能直接获得动画总的duration。
当然还有一些变种的方法,但是其大体思路都应该差不多。至于动画是否流畅播放,这要取决于你播放动画的时候,系统的繁忙程度。
下面给出例子:
定义帧动画:
res/anim/effect_animation.xml
<?xml version="1.0" encoding="utf-8"?><animation-list android:oneshot="true" xmlns:android="http://schemas.android.com/apk/res/android"> <item android:duration="0" android:drawable="@drawable/curtain_5" /> <item android:duration="0" android:drawable="@drawable/curtain_4" /> <item android:duration="0" android:drawable="@drawable/curtain_3" /> <item android:duration="0" android:drawable="@drawable/curtain_2" /> <item android:duration="200" android:drawable="@drawable/curtain_0" /> <item android:duration="0" android:drawable="@drawable/curtain_2" /> <item android:duration="0" android:drawable="@drawable/curtain_3" /> <item android:duration="0" android:drawable="@drawable/curtain_4" /> <item android:duration="0" android:drawable="@drawable/curtain_5" /></animation-list>
思路一:
private void checkIfAnimationDone() { mHandler.postDelayed(new Runnable() { public void run() { if (mAnimationDrawable.getCurrent() != mAnimationDrawable .getFrame(mAnimationDrawable.getNumberOfFrames() - 1)) { checkIfAnimationDone(); } else { mHandler.sendEmptyMessage(MSG_ANIMATION_FINISHED); } } }, mDuration); }; private void playAnimation() { if (mView == null) { mView = mContext.getView(); } mView.setBackgroundResource(R.anim.effect_animation); mAnimationDrawable = (AnimationDrawable) mView.getBackground(); mAnimationDrawable.start(); for (int i = 0; i < mAnimationDrawable.getNumberOfFrames(); i++) { mDuration += mAnimationDrawable.getDuration(i); } checkIfAnimationDone(); } private class MainHandler extends Handler { @Override public void handleMessage(Message msg) { if (LOG) { Log.v(TAG, "msg id=" + msg.what); } switch (msg.what) { case MSG_ANIMATION_FINISHED: if(mView == null) { break; } mView.setBackgroundResource(0); break; default: break; } } }
思路二:
The custom animation drawable class:public abstract class CustomAnimationDrawableNew extends AnimationDrawable {// Handles the animation callback.Handler mAnimationHandler;public CustomAnimationDrawableNew(AnimationDrawable aniDrawable) { // Add each frame to our animation drawable for (int i = 0; i < aniDrawable.getNumberOfFrames(); i++) {this.addFrame(aniDrawable.getFrame(i), aniDrawable.getDuration(i)); }}@Overridepublic void start() { super.start(); /* * Call super.start() to call the base class start animation method. * Then add a handler to call onAnimationFinish() when the total * duration for the animation has passed */ mAnimationHandler = new Handler(); mAnimationHandler.postDelayed(new Runnable() {public void run() { onAnimationFinish();} }, getTotalDuration());}/** * Gets the total duration of all frames. * * @return The total duration. */public int getTotalDuration() { int iDuration = 0; for (int i = 0; i < this.getNumberOfFrames(); i++) {iDuration += this.getDuration(i); } return iDuration;}/** * Called when the animation finishes. */public abstract void onAnimationFinish();}Use this class:ImageView iv = (ImageView) findViewById(R.id.iv_testing_testani); iv.setOnClickListener(new OnClickListener() { public void onClick(final View v) { // Pass our animation drawable to our custom drawable class CustomAnimationDrawableNew cad = new CustomAnimationDrawableNew( (AnimationDrawable) getResources().getDrawable( R.drawable.anim_test)) { @Override public void onAnimationFinish() { // Animation has finished... } }; // Set the views drawable to our custom drawable v.setBackgroundDrawable(cad); // Start the animation cad.start(); } });上述例子仅给出了其思路,如果你感兴趣,可以自己动手实验。
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