我正在研究用于轮盘游戏的旋转轮的动画,因为我希望轮子像真正的旋转一样旋转(例如,轮子旋转速度应该慢慢地开始然后快速地停止)
我知道我应用的基本旋转动画,下面是我的动画XML文件代码:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/linear_interpolator">
<rotate
xmlns:android="http://schemas.android.com/apk/res/android"
android:fromDegrees="0"
android:toDegrees="360"
android:duration="200"
android:repeatMode="restart"
android:repeatCount="-1"
android:pivotX="50%"
android:pivotY="50%">
</rotate>
和活动:
public class RouletteActivity extends Activity {
Button button_spin;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_roulette);
button_spin = (Button)findViewById(R.id.btn_spin);
button_spin.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
StartLoading();
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
public void run() {
StopLoading();
}
}, 5000);
}
});
}
public void StartLoading() {
ImageView img_wheel = (ImageView) this.findViewById(R.id.imageView1);
img_wheel.setImageDrawable(getResources().getDrawable(R.drawable.wheel));
Animation rotateLoading = AnimationUtils.loadAnimation(this, R.anim.rotate);
img_wheel.clearAnimation();
img_wheel.setAnimation(rotateLoading);
}
public void StopLoading() {
ImageView img_wheel = (ImageView) this.findViewById(R.id.imageView1);
if (img_wheel.getAnimation() != null)
{
img_wheel.clearAnimation();
img_wheel.setImageDrawable(getResources().getDrawable(R.drawable.wheel));
}
}
请帮助我实现我想要的动画,谢谢。
答案 0 :(得分:3)
您可以通过Interpolator应用动画来修改动画的行为 AccelerateDecelerateInterpolator似乎是最好的。
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/accelerate_decelerate_interpolator">
<rotate
xmlns:android="http://schemas.android.com/apk/res/android"
android:fromDegrees="0"
android:toDegrees="360"
android:duration="200"
android:repeatMode="restart"
android:repeatCount="-1"
android:pivotX="50%"
android:pivotY="50%">
</rotate>
</set>
或者更简单:
yourView.animate().rotation(value).setInterpolator(new AccelerateDecelerateInterpolator()).start();