android动画基础--旋转移动平移缩放

package com.imooc.viewanim;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.view.animation.AnimationSet;import android.view.animation.RotateAnimation;import android.view.animation.ScaleAnimation;import android.view.animation.TranslateAnimation;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void btnAlpha(View view) {        //透明度动画 public AlphaAnimation(float fromAlpha, float toAlpha){}        AlphaAnimation aa = new AlphaAnimation(0, 1);        //持续时间        aa.setDuration(1000);        view.startAnimation(aa);    }    public void btnRotate(View view) {//        旋转动画 public RotateAnimation(float fromDegrees, float toDegrees, float pivotX, float pivotY){}//        分别对应起始角度（toDegrees-fromDegrees），旋转中心点。        RotateAnimation ra = new RotateAnimation(90, 240, 50, 50);        ra.setDuration(1000);        view.startAnimation(ra);    }    public void btnRotateSelf(View view) {        //旋转动画，设置旋转参考系        RotateAnimation ra = new RotateAnimation(0, 360,                RotateAnimation.RELATIVE_TO_SELF, 0.5F,                RotateAnimation.RELATIVE_TO_SELF, 0.5F);        ra.setDuration(1000);        view.startAnimation(ra);    }    public void btnTranslate(View view) {        //平移动画        //自身中点做坐标原点（0,0） 向右移动200，向下移动300        TranslateAnimation ta = new TranslateAnimation(0, 200, 0, 300);        ta.setDuration(1000);        view.startAnimation(ta);    }    public void btnScale(View view) {        //缩放动画 public ScaleAnimation(float fromX, float toX, float fromY, float toY){}//        向右放大2，向下放大2 ，后恢复        ScaleAnimation sa = new ScaleAnimation(0, 2, 0, 2);        sa.setDuration(1000);        view.startAnimation(sa);    }    public void btnScaleSelf(View view) {        //缩放动画，设置缩放中心点。        ScaleAnimation sa = new ScaleAnimation(0, 1, 0, 1,                Animation.RELATIVE_TO_SELF, 0.5F,                Animation.RELATIVE_TO_SELF, 0.5F);        sa.setDuration(1000);        view.startAnimation(sa);    }    //动画集合    public void btnSet(View view) {        AnimationSet as = new AnimationSet(true);        as.setDuration(1000);        AlphaAnimation aa = new AlphaAnimation(0, 1);        aa.setDuration(1000);        as.addAnimation(aa);        TranslateAnimation ta = new TranslateAnimation(0, 100, 0, 200);        ta.setDuration(1000);        as.addAnimation(ta);        view.startAnimation(as);    }}

<LinearLayout 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:paddingLeft="@dimen/activity_horizontal_margin"    android:orientation="vertical"    android:gravity="center_horizontal"    tools:context=".MainActivity">    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Alpha"        android:layout_margin="10dp"        android:onClick="btnAlpha" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Rotate"        android:layout_margin="10dp"        android:onClick="btnRotate" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Rotate_self"        android:layout_margin="10dp"        android:onClick="btnRotateSelf" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Translate"        android:layout_margin="10dp"        android:onClick="btnTranslate" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Scale"        android:layout_margin="10dp"        android:onClick="btnScale" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Scale_Self"        android:layout_margin="10dp"        android:onClick="btnScaleSelf" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Anim Set"        android:layout_margin="10dp"        android:onClick="btnSet" /></LinearLayout>