项目要求做一个类似转盘抽奖的东西出来，还要求转的过程中要变速，变就变吧，要求阶段函数样式的变速。。。。
想了好多种办法，写好几段旋转动画拼凑成一圈，然后放到 AnimatorSet中，循环播放这个AnimatorSet，但是找了半天也没找到循环方式，于是在回调中重新开启了一下动画集
ObjectAnimator objectAnimator1 = ObjectAnimator.ofFloat(image, "rotation", 0f, 90f).setDuration(500);
ObjectAnimator objectAnimator2 = ObjectAnimator.ofFloat(image, "rotation", 90f,180f).setDuration(2000);
ObjectAnimator objectAnimator3 = ObjectAnimator.ofFloat(image, "rotation", 180f,270f).setDuration(3000);
ObjectAnimator objectAnimator4 = ObjectAnimator.ofFloat(image, "rotation", 270f,360f).setDuration(500);
final AnimatorSet animatorSet = new AnimatorSet();
animatorSet.playSequentially(objectAnimator1,objectAnimator2,objectAnimator3,objectAnimator4);
animatorSet.setInterpolator(new LinearInterpolator());
//周期间不停顿
animatorSet.start();
animatorSet.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {}
@Override
public void onAnimationEnd(Animator animation) {
animatorSet.start();
}
@Override
public void onAnimationCancel(Animator animation) {}
@Override
public void onAnimationRepeat(Animator animation) {}
});
可是这样就不能随时停止动画了。。。。
那么就只写一个动画，控制速度就好了，但事实是Interpolator回调方法里的参数并不是旋转的速度，而是一个与时间有关的参数，而返回值是旋转的位置。。。。
那么问题来了，我需要根据参数，自己计算出需要的返回值，经过操作，行不通，好吧，无爱了
不想说话了，直接上代码吧
Demo.java
import android.animation.ObjectAnimator;
import android.animation.TimeInterpolator;
import android.animation.ValueAnimator;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
/**
* Created by jiangtao on 2016/8/16.
*/
public class Demo extends Activity {
private ImageView image;
private float currentPoint;
private Button btn;
private ObjectAnimator objectAnimator = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_demo);
btn = (Button) findViewById(R.id.btn);
btn.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
objectAnimator.start();
break;
case MotionEvent.ACTION_UP:
Log.e("TAG", "" + objectAnimator.getAnimatedFraction() + "," + objectAnimator.getCurrentPlayTime() + "," + objectAnimator.getDuration());
// objectAnimator.pause();
Log.e("TAG", "" + objectAnimator.getAnimatedFraction() % 1.0f);
currentPoint = objectAnimator.getAnimatedFraction() % 1.0f;
objectAnimator.cancel();
if (currentPoint == 0.25 || currentPoint == 0.5 || currentPoint == 0.75 || currentPoint == 0) {Log.e("TAG","金奖");
Toast.makeText(Demo.this, "卧槽，真的假的？！！", Toast.LENGTH_SHORT).show();
}else if (currentPoint > 0.245 && currentPoint < 0.255
|| currentPoint > 0.495 && currentPoint < 0.505
|| currentPoint > 0.745 && currentPoint < 0.755) {
Log.e("TAG","银奖");
Toast.makeText(Demo.this, "你中了~", Toast.LENGTH_SHORT).show();
}else {
Toast.makeText(Demo.this, "是你手残，不要怪我~", Toast.LENGTH_SHORT).show();
}break;
}
return false;
}
});
image = (ImageView) findViewById(R.id.img_view);
/** 设置旋转动画 */
objectAnimator = ObjectAnimator.ofFloat(image, "rotation", 0f, 359f).setDuration(500);
/** 常用方法 */
objectAnimator.setRepeatCount(-1);
//设置重复次数
objectAnimator.setInterpolator(new MyInterpolator());//周期间不停顿
objectAnimator.setRepeatMode(ValueAnimator.INFINITE);//动画重复模式
// animation.setFillAfter(true);
//动画执行完后是否停留在执行完的状态
//animation.setStartOffset(long startOffset);
//执行前的等待时间
}
public class MyInterpolator implements TimeInterpolator {
@Override
public float getInterpolation(float input) {
// Log.e("TAG", "getInterpolation: " + input);
float mTension = 2.0f;
// return input * input * ((mTension + 1) * input + mTension) + 1.0f;
// return (float)(Math.sin(2 * 1 * Math.PI * input));
return (float) (Math.cos((input + 1) * Math.PI) / 2.0f) + 0.5f;
// return input;
}
}
}
activity_demo.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="@drawable/disk" />
<ImageView
android:id="@+id/img_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="@drawable/start" />
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_gravity="bottom" />
</RelativeLayout>
是不是感觉很乱？那就对了，不乱我贴给你看？用个屏幕大点的，横屏看吧。。。反正基本抽奖功能实现了。。。。
贴代码还是很还看的：）
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