Android中的动画（AlphaAnimation、RotateAnimation、ScaleAnimation、TranslateAnimation）

效果图

JAVA源码

final Animation rotate=AnimationUtils.loadAnimation(this, R.anim.anim_rotate);	//获取“旋转”动画资源
		final Animation translate=AnimationUtils.loadAnimation(this, R.anim.anim_translate);	//获取“平移”动画资源
		final Animation scale=AnimationUtils.loadAnimation(this, R.anim.anim_scale);	//获取“缩放”动画资源
		final Animation alpha=AnimationUtils.loadAnimation(this, R.anim.anim_alpha);	//获取“透明度变化”动画资源
		final ImageView iv=(ImageView)findViewById(R.id.imageView1);	//获取要应用动画效果的ImageView
		Button button1=(Button)findViewById(R.id.button1);	//获取“旋转”按钮
		button1.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				iv.startAnimation(rotate);		//播放“旋转”动画
				
			}
		});	
		Button button2=(Button)findViewById(R.id.button2);	//获取“平移”按钮
		button2.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				iv.startAnimation(translate);	//播放“平移”动画
				
			}
		});
		Button button3=(Button)findViewById(R.id.button3);	//获取“缩放”按钮
		button3.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				iv.startAnimation(scale);	//播放“缩放”动画
				
			}
		});		
		Button button4=(Button)findViewById(R.id.button4);	//获取“透明度渐变”按钮
		button4.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				iv.startAnimation(alpha);	//播放“透明度渐变”动画
				
			}
		});			
	}

XML源码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linearLayout1"
   
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/linearLayout2"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="旋转" />
    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="平移" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="缩放" />

    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="透明度渐变" />        
    </LinearLayout>
	
    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="50px"
        android:src="@drawable/cat" />
</LinearLayout>

XML效果图

anim源码

alpha

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
	<alpha android:fromAlpha="1"
	    android:toAlpha="0"
	    android:fillAfter="true"
	    android:repeatMode="reverse"
	    android:repeatCount="1"
	    android:duration="2000"/>
</set>

rotate

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
	<rotate 
	    android:interpolator="@android:anim/accelerate_interpolator"
	    android:fromDegrees="0"
	    android:toDegrees="720"
	    android:pivotX="50%"
	    android:pivotY="50%"
	    android:duration="2000">
	</rotate>
	<rotate 
	    android:interpolator="@android:anim/accelerate_interpolator"
		android:startOffset="2000"
		android:fromDegrees="360"
	    android:toDegrees="0"
	    android:pivotX="50%"
	    android:pivotY="50%"
	    android:duration="2000">
	</rotate>	
</set>

scale

<?xml version="1.0" encoding="utf-8"?>
<set  xmlns:android="http://schemas.android.com/apk/res/android">
	<scale android:fromXScale="1"
	    android:interpolator="@android:anim/decelerate_interpolator"
	    android:fromYScale="1"
	    android:toXScale="2.0"
	    android:toYScale="2.0"
	    android:pivotX="50%"
	    android:pivotY="50%"
	    android:fillAfter="true"
	    android:repeatCount="1"
	    android:repeatMode="reverse"
	    android:duration="2000"/>
</set>

translate

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate 
    android:fromXDelta="0"
    android:toXDelta="860"
    android:fromYDelta="0"
    android:toYDelta="0"
    android:fillAfter="true"
    android:repeatMode="reverse"
    android:repeatCount="1"
    android:duration="2000">
</translate> 
</set>