属性动画Animator学习

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资源文件

<LinearLayout    android:id="@+id/ll_root"    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity"    android:orientation="vertical">    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="位移动画"        android:onClick="lineAnimator"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="缩放动画"        android:onClick="ScaleAnimator"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="透明度动画"        android:onClick="alphaAnimator"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="旋转动画"        android:onClick="circleAnimator"/>    <View        android:layout_width="match_parent"        android:layout_height="50dp"/>    <ImageView        android:id="@+id/pic"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@mipmap/pic"        android:layout_gravity="center"/></LinearLayout>

public class MainActivity extends AppCompatActivity {    LinearLayout ll_root;    ImageView pic;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ll_root= (LinearLayout) findViewById(R.id.ll_root);        pic= (ImageView) findViewById(R.id.pic);    }    private void changeLocation(View view,int x,int y){        int left=x;        int top=y;        int right=x+view.getWidth();        int bottom=view.getHeight()+y;        view.layout(left,top,right,bottom);    }    /**     * 位移动画     * @param view     */    @TargetApi(Build.VERSION_CODES.HONEYCOMB)    public void lineAnimator(View view) {        int width=ll_root.getWidth();        int height=(int)pic.getY();        ValueAnimator animator=ValueAnimator.ofInt(height ,height+pic.getHeight());        animator.setDuration(1000);        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                int y = (int) animation.getAnimatedValue();                int x = (int) pic.getX();                changeLocation(pic, x, y);            }        });//        animator.setInterpolator(new LinearInterpolator());        animator.start();    }    /**     * 缩放动画     * @param view     */    @TargetApi(Build.VERSION_CODES.HONEYCOMB)    public void ScaleAnimator(View view) {        AnimatorSet animatorSet=new AnimatorSet();        ValueAnimator animatorsmall=ValueAnimator.ofFloat(1f,0);        animatorsmall.setDuration(1000);        animatorsmall.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                float scale= (float) animation.getAnimatedValue();                pic.setScaleX(scale);//                pic.setScaleY(scale);            }        });        ValueAnimator animatorlarge=ValueAnimator.ofFloat(0, 1.2f, 1.0f);        animatorlarge.setDuration(1000);        animatorlarge.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                float scale = (float) animation.getAnimatedValue();                pic.setScaleX(scale);//                pic.setScaleY(scale);            }        });        animatorSet.play(animatorlarge).after(animatorsmall);        animatorSet.start();    }    /**     * 透明度动画     * @param view     */    @TargetApi(Build.VERSION_CODES.HONEYCOMB)    public void alphaAnimator(View view) {        ValueAnimator animator=ValueAnimator.ofFloat(1f,0.5f,1f);        animator.setDuration(1000);        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                pic.setAlpha((Float) animation.getAnimatedValue());            }        });        animator.start();    }    /**     * 圆形旋转动画     * @param view     */    @TargetApi(Build.VERSION_CODES.HONEYCOMB)    public void circleAnimator(View view) {        ValueAnimator animator=ValueAnimator.ofFloat(0f, (float)(2* PI));//这边的转过的角度应使用弧度[0,2π]        animator.setDuration(3000);        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                int x = (int) (100 * cos((float) animation.getAnimatedValue()) + 200);                int y = (int) (100 * sin((float) animation.getAnimatedValue()) + 300);                changeLocation(pic, x, y);            }        });        animator.setInterpolator(new LinearInterpolator());//匀速        animator.start();    }    public void moveCircle(int x,int y,int cx,int cy,int r){    }}

android:interpolator 属性可以控制动画的变化速度：<!--动画开始时速度比较慢，在中间的时加速--><set android:interpolator="@android:anim/accelerate_decelerate_interpolator"><!--动画开始时速度比较慢，然后开始加速--><set android:interpolator="@android:anim/accelerate_interpolator"><!--动画循环播放特定的次数，以正弦曲线改变速度--><set android:interpolator="@android:anim/cycle_interpolator"><!--动画开始时速度比较慢，然后开始减速--><set android:interpolator="@android:anim/decelerate_interpolator"><!--均匀速度--><set android:interpolator="@android:anim/linear_interpolator">

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