Android卡通绘制者Animator与LayoutAnimator

概述：

与Android的Animation控件相比，Animator与LayoutAnimator处理后的控件完成动画效果后不会回复原状。Animator只使用与View对象，和Animation类似，Animator也能通过xml定义，需要用objectAnimator来定义各种动画效果。
LayoutView常用于给控件的添加删除增加一些特殊效果，如淡入淡出等。

Demo

Animator

Animator动态方式：

        //改变大小
        ObjectAnimator.ofFloat(mImageViewAnim,"scaleX",0.0f,1.0f).setDuration(2000).start();

Animator静态方式,需要在res目录下新建一个animator文件夹，在此文件夹里新建一个xml文件，我的是scale：

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:ordering="together">
    <objectAnimator
        android:duration="2000"
        android:propertyName="scaleX"
        android:valueFrom="0"
        android:valueTo="1">

    </objectAnimator>

    <objectAnimator
        android:duration="2000"
        android:propertyName="scaleY"
        android:valueFrom="0"
        android:valueTo="1">

    </objectAnimator>

    <objectAnimator
        android:duration="2000"
        android:propertyName="alpha"
        android:valueFrom="0"
        android:valueTo="1">

    </objectAnimator>

</set>

在代码中加载R.animator.scale资源

        AnimatorSet set = (AnimatorSet) AnimatorInflater.loadAnimator(getApplicationContext(),R.animator.scale);
        set.setTarget(view);//animator将永久改变view的状态
        set.start();

LayoutAnimator

public class LayoutAnimatorActivity extends Activity {
    private Button mButtonAdd;
    private LinearLayout mLinearLayout;
    private int count;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout_animator);

        mButtonAdd = (Button) findViewById(R.id.button_addAnimator);
        mLinearLayout = (LinearLayout) findViewById(R.id.linear_layout);

    //定义一个LayoutTransition，用于设置各种动画效果
        LayoutTransition transition = new LayoutTransition();
        //
        transition.getDuration(2000);
        //当子控件被添加后出现时，动画效果是静态实现的R.animator.scale
        transition.setAnimator(LayoutTransition.APPEARING, AnimatorInflater.loadAnimator(getApplicationContext(), R.animator.scale));
//当CHANGE_APPEARING是，调用默认状态改变的动画效果       transition.setAnimator(LayoutTransition.CHANGE_APPEARING,transition.getAnimator(
                LayoutTransition.CHANGE_APPEARING));
//当子控件消失时，调用默认的消失的动画效果          transition.setAnimator(LayoutTransition.DISAPPEARING,transition.getAnimator(
                LayoutTransition.DISAPPEARING));
//当CHANGE_APPEARING是，调用默认的消失时状态改变的动画效果         transition.setAnimator(LayoutTransition.CHANGE_DISAPPEARING,transition.getAnimator(
                LayoutTransition.CHANGE_DISAPPEARING));
        mLinearLayout.setLayoutTransition(transition);
        mButtonAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                count++;
                Button btn = new Button(getApplicationContext());
                //LayoutParams类是用于child view（子视图） 向 parent view（父视图）传达自己各种属性的容器
                ViewGroup.LayoutParams params =
                        new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
                btn.setLayoutParams(params);
                btn.setText("按钮" + count);
                //设置btn的初始尺寸大小
                btn.setScaleX(0f);
                btn.setScaleY(0f);
                //给要新添加的Button类子控件加点击事件：点击删除自己
                btn.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        mLinearLayout.removeView(v);
                    }
                });
                //在mLinearLayout中添加这个子控件
                mLinearLayout.addView(btn);

            }
        });
    }
}

结果演示：