Android 动画总结（补间动画，属性动画）

在开发中，为了提升用户体验，我们会添加很多动画效果，以前一直在使用，但是从来没有总结一下，最近工作轻松，所以总结一下这个方面：

这里主要是补间动画（Animation），属性动画(Animator)两类。

• 补间动画（Animation）

• 属性动画(Animator)

• 动画实例

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补间动画（Animation）

透明动画

    AlphaAnimation alphaAnimation = new AlphaAnimation(0, 1);
    alphaAnimation.setDuration(2000);
    iv.startAnimation(alphaAnimation);

旋转动画

注意： RotateAnimation.RELATIVE_TO_SELF, 0.5f相对控件本身中点。

  RotateAnimation rotateAnimation = new RotateAnimation(0, 360,            
     RotateAnimation.RELATIVE_TO_SELF, 0.5f, 
     RotateAnimation.RELATIVE_TO_SELF, 0.5f);
 rotateAnimation.setDuration(2000);
 iv.startAnimation(rotateAnimation);

位移动画

TranslateAnimation translateAnimation = new TranslateAnimation(0, 200, 0, 300);
translateAnimation.setDuration(2000);
iv.startAnimation(translateAnimation);

缩放动画

  ScaleAnimation scaleAnimation = new ScaleAnimation(0, 2, 0, 2);
  scaleAnimation.setDuration(2000);
  iv.startAnimation(scaleAnimation);

动画合集

 AnimationSet set = new AnimationSet(true);
                set.setDuration(2000);

                AlphaAnimation alphaAnimation2 = new AlphaAnimation(0, 1);
                alphaAnimation2.setDuration(2000);

                RotateAnimation rotateAnimation2 = new RotateAnimation(0, 360, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
                rotateAnimation2.setDuration(2000);

                TranslateAnimation translateAnimation2 = new TranslateAnimation(0, 200, 0, 300);
                translateAnimation2.setDuration(2000);

                ScaleAnimation scaleAnimation2 = new ScaleAnimation(0, 1, 0, 1, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
                scaleAnimation2.setDuration(2000);

                set.addAnimation(alphaAnimation2);
                set.addAnimation(rotateAnimation2);
                set.addAnimation(scaleAnimation2);
                set.addAnimation(translateAnimation2);

                iv.startAnimation(set);

属性动画(Animator)

代码实现

注意：ObjectAnimator.ofFloat(iv, “translationX”, 300)，初始化方法与补间动画不同，第一参数为实现动画的控件，第一个参数为动画类型，第三个为移动的数据，有时候这里是两个数据，一个开始，一个结束。

位移动画

 ObjectAnimator animator = ObjectAnimator.ofFloat(iv, "translationX", 300);
 animator.setDuration(2000);
 animator.start();

动画合集

 ObjectAnimator tran = ObjectAnimator.ofFloat(iv, "translationX", 300);
 tran.setDuration(2000);

 ObjectAnimator scale = ObjectAnimator.ofFloat(iv, "scaleX", 0.1f, 1f);

 ObjectAnimator rotate = ObjectAnimator.ofFloat(iv, "rotation", 0, 360);
 rotate.setDuration(2000);

 AnimatorSet set = new AnimatorSet();
 set.setDuration(2000);
 set.playTogether(tran, scale, rotate);
 set.start();

xml实现

这里粘贴guoling大神的博客，讲的很详细。
http://blog.youkuaiyun.com/guolin_blog/article/details/43536355

动画实例－－灵动菜单

最后通过使用例子来加强对动画的理解。

对于这个动画，我们怎么实现呢？它具有用户交互性，肯定是不能使用补间动画。其次只要针对不同的按钮设置不同的动画，设置相应的差值器来实现打开，合拢效果。
打开动画如下：

    //展开动画
    private void startAnim() {
        ObjectAnimator animator0 = ObjectAnimator.ofFloat(btn_menu, "alpha", 1f, 0.5f);
        ObjectAnimator animator1 = ObjectAnimator.ofFloat(buttons[0], "translationY", 300f);
        ObjectAnimator animator2 = ObjectAnimator.ofFloat(buttons[1], "translationX", 300f);
        ObjectAnimator animator3 = ObjectAnimator.ofFloat(buttons[2], "translationY", -300f);
        ObjectAnimator animator4 = ObjectAnimator.ofFloat(buttons[3], "translationX", -300f);
        AnimatorSet set = new AnimatorSet();
        set.setDuration(500);
        set.setInterpolator(new BounceInterpolator());
        set.playTogether(animator0, animator1, animator2, animator3, animator4);
        set.start();
        isOpen = true;
    }

xml布局如下；

<?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"
    android:orientation="vertical">



    <Button
        android:id="@+id/btn_view1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:onClick="onClick"
        android:text="button1" />

    <Button
        android:id="@+id/btn_view2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:onClick="onClick"
        android:text="button2" />

    <Button
        android:id="@+id/btn_view3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:onClick="onClick"
        android:text="button3" />

    <Button
        android:id="@+id/btn_view4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:onClick="onClick"
        android:text="button4" />
    <Button
        android:id="@+id/btn_menu"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:onClick="onClick"
        android:text="菜单" />
</RelativeLayout>

整体代码如下：

/**
 * 主要是实现点击后弹出子菜单的动画
 * Created by kenway on 17/3/16 14:29
 * Email : xiaokai090704@126.com
 */

public class MenuAnimActivity extends AppCompatActivity {
    private Button btn_menu;
    private Button[] buttons = new Button[4];
    //判断菜单是否打开
    private boolean isOpen;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menuanim);
        btn_menu = (Button) findViewById(R.id.btn_menu);
        buttons[0] = (Button) findViewById(R.id.btn_view1);
        buttons[1] = (Button) findViewById(R.id.btn_view2);
        buttons[2] = (Button) findViewById(R.id.btn_view3);
        buttons[3] = (Button) findViewById(R.id.btn_view4);
    }

    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.btn_menu:
                if (!isOpen) {
                    startAnim();
                } else {
                    closeAnim();
                }

                break;
            case R.id.btn_view1:
//
                break;
            case R.id.btn_view2:

                break;
            case R.id.btn_view3:

                break;
            case R.id.btn_view4:

                break;

        }
    }

    //展开动画
    private void startAnim() {
        ObjectAnimator animator0 = ObjectAnimator.ofFloat(btn_menu, "alpha", 1f, 0.5f);
        ObjectAnimator animator1 = ObjectAnimator.ofFloat(buttons[0], "translationY", 300f);
        ObjectAnimator animator2 = ObjectAnimator.ofFloat(buttons[1], "translationX", 300f);
        ObjectAnimator animator3 = ObjectAnimator.ofFloat(buttons[2], "translationY", -300f);
        ObjectAnimator animator4 = ObjectAnimator.ofFloat(buttons[3], "translationX", -300f);
        AnimatorSet set = new AnimatorSet();
        set.setDuration(500);
        set.setInterpolator(new BounceInterpolator());
        set.playTogether(animator0, animator1, animator2, animator3, animator4);
        set.start();
        isOpen = true;
    }

    //关闭菜单动画
    private void closeAnim() {
        ObjectAnimator animator0 = ObjectAnimator.ofFloat(btn_menu, "alpha", 0.5f, 1f);
        ObjectAnimator animator1 = ObjectAnimator.ofFloat(buttons[0], "translationY", 0);
        ObjectAnimator animator2 = ObjectAnimator.ofFloat(buttons[1], "translationX", 0);
        ObjectAnimator animator3 = ObjectAnimator.ofFloat(buttons[2], "translationY", 0);
        ObjectAnimator animator4 = ObjectAnimator.ofFloat(buttons[3], "translationX", 0);
        AnimatorSet set = new AnimatorSet();
        set.setDuration(500);
        set.setInterpolator(new BounceInterpolator());
        set.playTogether(animator0, animator1, animator2, animator3, animator4);
        set.start();
        isOpen = false;
    }
}

其实这些代码都特别简单，通过这些代码，你是否发现一些感觉起来不好实现的功能，使用动画便可以很容易的实现。