android Animations 动画效果(2)_Android

android Animations 动画效果(二)
Animations的第二种使用方法
1在res文件夹下新建一个anim文件夹
2.创建xml文件，并首先加入set标签，改标签如下：
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/accelerate_interpolator">
</set>
3.在该标签中加入rotate，alpha，scale或translate标签

4.在代码中使用AnimationUtils当中装载xml文件，并生成Animation对象

下面是代码

MainActivity.java

package com.yx.animations01;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.AnimationUtils;
import android.view.animation.RotateAnimation;
import android.view.animation.ScaleAnimation;
import android.view.animation.TranslateAnimation;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {

   private Button scaleButton=null;
   private Button rotateButton=null;
   private Button alphaButton=null;
   private Button translateButton=null;
   private ImageView imageView = null;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);

       scaleButton = (Button) findViewById(R.id.scaleButton);
       scaleButton.setOnClickListener(new scaleButtonListener());

       rotateButton = (Button) findViewById(R.id.rotateButton);
       rotateButton.setOnClickListener(new rotateButtonListener());

       alphaButton = (Button) findViewById(R.id.alphaButton);
       alphaButton.setOnClickListener(new alphaButtonListener());

       translateButton = (Button) findViewById(R.id.translateButton);
       translateButton.setOnClickListener(new translateButtonListener());

       imageView = (ImageView) findViewById(R.id.imageViewId);
   }

   class scaleButtonListener implements OnClickListener{
       @Override
       public void onClick(View v) {
           Animation animation = AnimationUtils.loadAnimation(MainActivity.this, R.anim.scale);
           imageView.startAnimation(animation);
       }
   }

   class rotateButtonListener implements OnClickListener{
       @Override
       public void onClick(View v) {
           Animation animation = AnimationUtils.loadAnimation(MainActivity.this, R.anim.rotate);
           imageView.startAnimation(animation);
       }
   }

   //淡入淡出
   class alphaButtonListener implements OnClickListener{
       @Override
       public void onClick(View v) {
           //使用AnimationUtils装载动画设置文件
           Animation animation = AnimationUtils.loadAnimation(MainActivity.this, R.anim.alpha);
           imageView.startAnimation(animation);
       }
   }

   class translateButtonListener implements OnClickListener{
       @Override
       public void onClick(View v) {
           Animation animation = AnimationUtils.loadAnimation(MainActivity.this, R.anim.translate);
           imageView.startAnimation(animation);
       }
   }

}

下面分别是四个xml

alpha.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/accelerate_interpolator">
    <rotate android:fromDegrees="0"
        android:toDegrees="+350"
        android:pivotX="50%"
        android:pivotY="50%"
        android:duration="3000"></rotate>
    
</set>

scale.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/accelerate_interpolator">
    <scale
        android:fromXScale="1.0"
        android:toXScale="0.0"
        android:fromYScale="1.0"
        android:toYScale="0.0"
        android:pivotX="50%"
        android:pivotY="50%"
        android:duration="2000"
        ></scale>
</set>

translate.xml