【移动应用开发技术】Android如何实现旋转、平移、缩放和透明度渐变的补间动画

【移动应用开发技术】Android如何实现旋转、平移、缩放和透明度渐变的补间动画

1.在新建项目的res目录中，创建一个名为anim的目录，并在该目录中创建实现旋转、平移、缩放和透明度渐变的动画资源文件。<?xml

version="1.0"

encoding="utf-8"?>

<set

xmlns:android="/apk/res/android">

<alpha

android:fromAlpha="1"

android:toAlpha="0"

android:fillAfter="true"

android:repeatMode="reverse"

android:repeatCount="1"

android:duration="2000"/>

</set><?xml

version="1.0"

encoding="utf-8"?>

<set

xmlns:android="/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

android:interpolator="@android:anim/accelerate_interpolator"

android:startOffset="2000"

android:fromDegrees="360"

android:toDegrees="0"

android:pivotX="50%"

android:pivotY="50%"

android:duration="2000"/>

</set><?xml

version="1.0"

encoding="utf-8"?>

<set

xmlns:android="/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><?xml

version="1.0"

encoding="utf-8"?>

<set

xmlns:android="/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"/>

</set>res/layout/main.xml:

[html]

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<?xml

version="1.0"

encoding="utf-8"?>

<LinearLayout

xmlns:android="/apk/res/android"

xmlns:tools="/tools"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:id="@+id/linearLayout1"

android:orientation="vertical"

>

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:id="@+id/linearLayout2"

android:orientation="horizontal">

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/button1"

android:text="旋转"/>

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/button2"

android:text="平移"/>

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/button3"

android:text="缩放"/>

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/button4"

android:text="透明度变化"/>

</LinearLayout>

<ImageView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/imageView1"

android:src="@drawable/img1"/>

</LinearLayout>效果如图/upload/information/20200623/125/123456.jpg2.MainActivity：[java]

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package

com.example.test;

import

android.app.Activity;

import

android.os.Bundle;

import

android.view.View;

import

android.view.View.OnClickListener;

import

android.view.animation.Animation;

import

android.view.animation.AnimationUtils;

import

android.widget.Button;

import

android.widget.ImageView;

public

class

MainActivity

extends

Activity

{

@Override

public

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

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

//获取要应用动画效果的ImageView

final

ImageView

iv=(ImageView)findViewById(R.id.imageView1);

Button

button1=(Button)findViewById(R.id.button1);//获取"旋转"按钮

button1.setOnClickListener(new

OnClickListener()

{

@Override

public

void

onClick(View

arg0)

{

//播放旋转动画

iv.startAnimation(rotate);

}

});

Button

button2=(Button)findViewById(R.id.button2);//获取"平移"按钮

button2.setOnClickListener(new

OnClickListener()

{

@Override

public

void

onClick(View

arg0)

{

//播放平移动画

iv.startAnimation(translate);

}

});

Button

button3=(Button)findViewById(R.id.button3);//获取"缩放"按钮

button3.setOnClickListener(new

OnClickListener()

{

@Override

public

void

onClick(View

arg0)

{

//播放缩放动画

iv.startAnimation(scale);

}

});

Button

button4=(Button)findViewById(R.id.button4);//获取"透明度渐变"按钮

button4.setOnClickListener(new

OnClickListener()

{

@Override

public

void

onClick(