安卓开发20：动画之Animation 详细使用-主要通过java代码实现动画效果

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AlphaAnimation 透明效果实现：

activity_main.xml中仅仅是一个简单的图片，下面的例子都会使用这个xml：

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="70dp"
android:layout_marginTop="138dp"
android:src="@drawable/jhs_button1_h" />
</RelativeLayout>

透明效果的java代码：

package com.example.test.com;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.DecelerateInterpolator;
import android.widget.ImageView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
ImageView imageView = (ImageView) findViewById(R.id.imageView1);
//图片点击的时候，启动动画效果
imageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Animation anim = getAlphaAnimation();
v.startAnimation(anim);
}
});
}
/**
* 透明效果
* @return
*/
public Animation getAlphaAnimation() {
//实例化 AlphaAnimation 主要是改变透明度
//透明度从 1-不透明 0-完全透明
Animation animation = new AlphaAnimation(1.0f, 0.5f);
//设置动画插值器被用来修饰动画效果,定义动画的变化率
animation.setInterpolator(new DecelerateInterpolator());
//设置动画执行时间
animation.setDuration(1000);
return animation;
}
}

ScaleAnimation 缩放效果实现：

package com.example.test.com;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.ScaleAnimation;
import android.widget.ImageView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
ImageView imageView = (ImageView) findViewById(R.id.imageView1);
//图片点击的时候，启动动画效果
imageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Animation scalegetAnim = getScaleAnimation();
v.startAnimation(scalegetAnim);
}
});
}
/**
* 缩放动画
* @return
*/
public Animation getScaleAnimation() {
//实例化 ScaleAnimation 主要是缩放效果
//参数：fromX-动画开始前，x坐标 toX-动画结束后x坐标
//fromY-动画开始前，Y坐标 toY-动画结束后Y坐标
//pivotXType - 为动画相对于物件的X坐标的参照物 pivotXValue - 值
//pivotYType - 为动画相对于物件的Y坐标的参照物 pivotYValue - 值
Animation animation = new ScaleAnimation(1.0f, 0.0f, 1.0f, 0.0f,
Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f);
//设置动画插值器被用来修饰动画效果,定义动画的变化率
animation.setInterpolator(new DecelerateInterpolator());
//设置动画执行时间
animation.setDuration(1000);
return animation;
}
}

RotateAnimation 旋转效果实现：

package com.example.test.com;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.RotateAnimation;
import android.view.animation.ScaleAnimation;
import android.widget.ImageView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
ImageView imageView = (ImageView) findViewById(R.id.imageView1);
//图片点击的时候，启动动画效果
imageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Animation rotateAnim = getRotateAnimation();
v.startAnimation(rotateAnim);
}
});
}
/**
* 旋转
* @return
*/
public Animation getRotateAnimation() {
//实例化RotateAnimation
//以自身中心为圆心，旋转360度正值为顺时针旋转，负值为逆时针旋转
RotateAnimation animation = new RotateAnimation(0, 360,
Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f);
//设置动画插值器被用来修饰动画效果,定义动画的变化率
animation.setInterpolator(new DecelerateInterpolator());
//设置动画执行时间
animation.setDuration(1000);
return animation;
}
}

TranslateAnimation 移动效果实现：

package com.example.test.com;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.RotateAnimation;
import android.view.animation.ScaleAnimation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
ImageView imageView = (ImageView) findViewById(R.id.imageView1);
//图片点击的时候，启动动画效果
imageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Animation translateAnim = getTranslateAnimation();
v.startAnimation(translateAnim);
}
});
}
/**
* 移动
* @return
*/
public Animation getTranslateAnimation() {
//实例化TranslateAnimation
//以自身为坐标系和长度单位，从(0,0)移动到(1,1)
TranslateAnimation animation = new
TranslateAnimation(
Animation.RELATIVE_TO_SELF, 0.0f,
Animation.RELATIVE_TO_SELF, 1.0f,
Animation.RELATIVE_TO_SELF, 0.0f,
Animation.RELATIVE_TO_SELF, 1.0f);
//设置动画插值器被用来修饰动画效果,定义动画的变化率
animation.setInterpolator(new DecelerateInterpolator());
//设置动画执行时间
animation.setDuration(1000);
return animation;
}
}

AnimationSet 动画集合实现和使用：

package com.example.test.com;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.RotateAnimation;
import android.view.animation.ScaleAnimation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
ImageView imageView = (ImageView) findViewById(R.id.imageView1);
//图片点击的时候，启动动画效果
imageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//AnimationSet类是一个Animation集合，里面可以许多Animation，
//且在AnimationSet中设置的属性适用于里面的所有Animation。
//参数true 则共享@Interpolator
AnimationSet set = new AnimationSet(true);
//透明
Animation alphaAnim = getAlphaAnimation();
set.addAnimation(alphaAnim);
//缩放
Animation scalegetAnim = getScaleAnimation();
set.addAnimation(scalegetAnim);
//旋转
Animation rotateAnim = getRotateAnimation();
set.addAnimation(rotateAnim);
//移动上面三个动画是同时进行的，我现在需要让移动这个动画在上面的动画之后执行
//需要使用setStartOffset 设置动画开始的时间
Animation translateAnim = getTranslateAnimation();
translateAnim.setStartOffset(500);
set.addAnimation(translateAnim);
v.startAnimation(set);
}
});
}
/**
* 透明效果
* @return
*/
public Animation getAlphaAnimation() {
//实例化 AlphaAnimation 主要是改变透明度
//透明度从 1-不透明 0-完全透明
Animation animation = new AlphaAnimation(1.0f, 0.8f);
//设置动画插值器被用来修饰动画效果,定义动画的变化率
animation.setInterpolator(new DecelerateInterpolator());
//设置动画执行时间
animation.setDuration(1000);
return animation;
}
/**
* 缩放动画
* @return
*/
public Animation getScaleAnimation() {
//实例化 ScaleAnimation 主要是缩放效果
//参数：fromX-动画开始前，x坐标 toX-动画结束后x坐标
//fromY-动画开始前，Y坐标 toY-动画结束后Y坐标
//pivotXType - 为动画相对于物件的X坐标的参照物 pivotXValue - 值
//pivotYType - 为动画相对于物件的Y坐标的参照物 pivotYValue - 值
Animation animation = new ScaleAnimation(1.0f, 0.0f, 1.0f, 0.0f,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
0.5f);
//设置动画插值器被用来修饰动画效果,定义动画的变化率
animation.setInterpolator(new DecelerateInterpolator());
//设置动画执行时间
animation.setDuration(1000);
return animation;
}
/**
* 旋转
* @return
*/
public Animation getRotateAnimation() {
//实例化RotateAnimation
//以自身中心为圆心，旋转360度正值为顺时针旋转，负值为逆时针旋转
RotateAnimation animation = new RotateAnimation(0, 360,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
0.5f);
//设置动画插值器被用来修饰动画效果,定义动画的变化率
animation.setInterpolator(new DecelerateInterpolator());
//设置动画执行时间
animation.setDuration(1000);
return animation;
}
/**
* 移动
* @return
*/
public Animation getTranslateAnimation() {
//实例化TranslateAnimation
//以自身为坐标系和长度单位，从(0,0)移动到(1,1)
TranslateAnimation animation = new TranslateAnimation(
Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF,
1.0f, Animation.RELATIVE_TO_SELF, 0.0f,
Animation.RELATIVE_TO_SELF, 1.0f);
//设置动画插值器被用来修饰动画效果,定义动画的变化率
animation.setInterpolator(new DecelerateInterpolator());
//设置动画执行时间
animation.setDuration(1000);
return animation;
}
}

Interpolator 描述动画的速率：

安卓默认的Interpolator：

AccelerateInterpolator：动画开始时比较慢，然后逐渐加速。

DecelerateInterpolator：动画开始时比较快，然后逐渐减速。

AccelerateDecelerateInterpolator：动画开始时和结束时比较慢，中间过程加速。

LinearInterpolator：动画匀速进行。

CycleInterpolator：动画循环播放指定次数，速率沿着正弦曲线改变。

DecelerateInterpolator代码：主要实现getInterpolation ，也可以自定义

/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.view.animation;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
/**
* An interpolator where the rate of change starts out quickly and
* and then decelerates.
*
*/
public class DecelerateInterpolator implements Interpolator {
public DecelerateInterpolator() {
}
/**
* Constructor
*
* @param factor Degree to which the animation should be eased. Setting factor to 1.0f produces
* an upside-down y=x^2 parabola. Increasing factor above 1.0f makes exaggerates the
* ease-out effect (i.e., it starts even faster and ends evens slower)
*/
public DecelerateInterpolator(float factor) {
mFactor = factor;
}
public DecelerateInterpolator(Context context, AttributeSet attrs) {
TypedArray a =
context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.DecelerateInterpolator);
mFactor = a.getFloat(com.android.internal.R.styleable.DecelerateInterpolator_factor, 1.0f);
a.recycle();
}
public float getInterpolation(float input) {
float result;
if (mFactor == 1.0f) {
result = (float)(1.0f - (1.0f - input) * (1.0f - input));
} else {
result = (float)(1.0f - Math.pow((1.0f - input), 2 * mFactor));
}
return result;
}
private float mFactor = 1.0f;
}

使用：

//设置动画插值器被用来修饰动画效果,定义动画的变化率
animation.setInterpolator(new DecelerateInterpolator());

AnimationListener 监听器：

可以监听动画前，动画结束，动画repeat的时候的动作，对上面代码中的移动效果进行动画监听：

/**
* 移动
* @return
*/
public Animation getTranslateAnimation() {
//实例化TranslateAnimation
//以自身为坐标系和长度单位，从(0,0)移动到(1,1)
TranslateAnimation animation = new TranslateAnimation(
Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF,
1.0f, Animation.RELATIVE_TO_SELF, 0.0f,
Animation.RELATIVE_TO_SELF, 1.0f);
//设置动画插值器被用来修饰动画效果,定义动画的变化率
animation.setInterpolator(new DecelerateInterpolator());
//设置重复动画
animation.setRepeatCount(2);
//设置动画执行时间
animation.setDuration(1000);
//设置监听器
animation.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
//动画开始前
Toast.makeText(getBaseContext(), "Strart!", Toast.LENGTH_SHORT).show();
}
@Override
public void onAnimationRepeat(Animation animation) {
//重复动画的时候，
Toast.makeText(getBaseContext(), "Repeat!", Toast.LENGTH_SHORT).show();
}
@Override
public void onAnimationEnd(Animation animation) {
// 结束动画的时候
Toast.makeText(getBaseContext(), "End!", Toast.LENGTH_SHORT).show();
}
});
return animation;
}

备注内容

动画运动完毕后，停止在动画完成的位置

animation.setFillAfter(true);
animation.setFillEnabled(true);

动画结束后，清除动画

tempLayout.clearAnimation();

动画结束后，改变View的偏移量

tempLayout.offsetLeftAndRight(width);

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