Animation动画效果二(推荐)

Interpolator定义动画变化
AccelerateDecelerateInterpolator动画开始和结束的地方速率改变比较慢, 中间加速
AccelerateInterpolator动画开始的地方速率改变比较慢, 然后开始加速
CycleInterpolator动画循环播放特定的次数, 速率改变沿着正玄曲线
DecelerateInterpolator动画开始的地发光速率改变比较慢, 然后开始减速
LinearInterpolator在动画以均匀的速率改变

比如下面例子的xml声明部分android:interpolator="@android:anim/accelerate_interpolator", 如果后面再加上android:shareInterpolator="true", 则意味set中所有动画效果将同样使用AccelerateDecelerateInterpolator, 如果为false. 则需要在每个动画中定义这个Interpolator. 例如:
<alpha andorid:interpolator="@android:anim/accelerate_interpolator"/>


首先在/res/文件夹下面新建anim文件夹, 新建一个xml文件存放animation效果
例如/res/anim/alph.xml

例子:
/res/anim/alph.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_decelerate_interpolator">
    <alpha android:fromAlpha="1" android:toAlpha="0" android:duration="1000"/>
</set>

/res/anim/rotate.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_decelerate_interpolator">
	<!-- android:pivotX="50" 表示绝对定位
		 android:pivotX="50%" 表示相对控件本身的定位
		 android:pivotX="50%p" 表示相对父控件的定位
	 -->
    <rotate android:fromDegrees="0" android:toDegrees="+350" android:pivotX="50%" android:pivotY="50%" android:duration="3000"/>
</set>

/res/anim/sacle.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_decelerate_interpolator">
	<!-- android:pivotX="50" 表示绝对定位
		 android:pivotX="50%" 表示相对控件本身的定位
		 android:pivotX="50%p" 表示相对父控件的定位
	 -->
    <scale android:fromXScale="1" android:toXScale="0" android:fromYScale="1" android:toYScale="0" android:pivotX="50%" android:pivotY="50%" android:duration="2000"/>
</set>

/res/anim/translate.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_decelerate_interpolator">
    <translate android:fromXDelta="50%" android:toXDelta="100%" android:fromYDelta="0" android:toYDelta="100%" android:duration="2000"/>
</set>

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
	<TextView  
	    android:layout_width="fill_parent" 
	    android:layout_height="wrap_content" 
	    android:text="@string/hello"
	    />
	<LinearLayout android:id="@+id/linearLayout1" android:layout_width="match_parent" android:orientation="vertical" android:layout_height="wrap_content" android:layout_weight="1">
	    <ImageView android:layout_height="wrap_content" android:id="@+id/imageView1" android:layout_width="wrap_content" android:src="@drawable/icon" ></ImageView>
	</LinearLayout>
	<LinearLayout android:layout_height="wrap_content" android:id="@+id/linearLayout2" android:layout_width="match_parent" android:orientation="vertical">
	    <Button android:layout_height="wrap_content" android:layout_width="match_parent" android:id="@+id/button1" android:text="@string/translate" android:onClick="translate"></Button>
	    <Button android:layout_height="wrap_content" android:layout_width="match_parent" android:id="@+id/button3" android:text="@string/alpha" android:onClick="alpha"></Button>
	    <Button android:layout_height="wrap_content" android:layout_width="match_parent" android:id="@+id/button2" android:text="@string/rotate" android:onClick="rotate"></Button>
	    <Button android:layout_height="wrap_content" android:layout_width="match_parent" android:id="@+id/button4" android:text="@string/scale" android:onClick="scale"></Button>
	</LinearLayout>
</LinearLayout>

Animation2Activity.java

package com.cn;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;

public class Animation2Activity extends Activity {
    /** Called when the activity is first created. */
	ImageView iv = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        iv = (ImageView)findViewById(R.id.imageView1);
    }
    
    public void translate(View v){
    	Animation animation = AnimationUtils.loadAnimation(this, R.anim.translate);
    	iv.startAnimation(animation);
    }
    public void alpha(View v){
    	Animation animation = AnimationUtils.loadAnimation(this, R.anim.alpha);
    	iv.startAnimation(animation);
    }
    public void rotate(View v){
    	Animation animation = AnimationUtils.loadAnimation(this, R.anim.rotate);
    	iv.startAnimation(animation);
    }
    public void scale(View v){
    	Animation animation = AnimationUtils.loadAnimation(this, R.anim.sacle);
    	iv.startAnimation(animation);
    }
}