The Animation in android
The android provide two types of animation.Tween Animation is one,such as rotation,translation,scale,gradual change(gradient).
main types:
Animation、AlphaAnimation、RotateAnimation、ScaleAnimation、TranslateAniamtion、AnimationSet
1.AlphaAnimation
the first argument means the start transparency of animation,the second argument means the end transparency of the animation.
2.RotateAnimation
arguments:
fromDegrees: start angle of the animation
toDegrees:end angle of the animation
3.ScaleAnimation
arguments:
fromX: start scale in X cdoordination;
toX: end scale in X coordination;
fromY: start scale in Y coordination;
toY: end scale in Y coordination;
on the other hand,you can set the scale mode:pivotXType/pivotYType,scale animation relative to x,y's start position:pivotXvalue/pivotYValue ect.
4.TranslateAnimation
arguments:
fromXDelta: start X coordination of animation
toXDelta: end X coordination of animation
fromYDelta: start Y coordination of animation
toYDelta: end Y coordination of animation
the layout file's code as bellow:
<?xml version="1.0" encoding="utf-8"?> <AbsoluteLayout android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android"> <Button android:id="@+id/button_scale" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="scale" android:layout_x="5dp" android:layout_y="383dp" /> <Button android:id="@+id/button_rotate" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="rotate" android:layout_x="158dp" android:layout_y="383dp" /> <Button android:id="@+id/button_alpha" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="alpha" android:layout_x="5dp" android:layout_y="331dp" /> <Button android:id="@+id/button_translate" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="translate" android:layout_x="160dp" android:layout_y="329dp" /> <Button android:id="@+id/button_alpha_translate" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="alpha_translate" android:layout_x="84dp" android:layout_y="265dp" /> <ImageView android:id="@+id/imageview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_x="105dp" android:layout_y="133dp" android:src="@drawable/ic_launcher" /> </AbsoluteLayout>
the class code:
public class Animations_Activity extends Activity {
private Button button1;
private Button button2;
private Button button3;
private Button button4;
private Button button5;
private ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_animations_);
button1=(Button)findViewById(R.id.button_alpha);
button2=(Button)findViewById(R.id.button_rotate);
button3=(Button)findViewById(R.id.button_scale);
button4=(Button)findViewById(R.id.button_translate);
button5=(Button)findViewById(R.id.button_alpha_translate);
imageView=(ImageView)findViewById(R.id.imageview);
button1.setOnClickListener(new MyButton());
button2.setOnClickListener(new MyButton());
button3.setOnClickListener(new MyButton());
button4.setOnClickListener(new MyButton());
button5.setOnClickListener(new MyButton());
}
class MyButton implements OnClickListener{
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
switch (arg0.getId()) {
case R.id.button_alpha:
Alpha();
break;
case R.id.button_rotate:
Rotata();
break;
case R.id.button_scale:
Scale();
break;
case R.id.button_translate:
Translate();
break;
case R.id.button_alpha_translate:
Alpha_Translate();
break;
default:
break;
}
}
}
/*
* 1.创建一个AnimationSet对象，该对象存储的是动画的集合
* 2.根据需要创建相应的Animation对象
* 3.根据动画的需求，为Animation对象设置相应的数据（即执行效果）
* 4.奖Animation对象添加到AnimationSet对象当中
* 5.使用控件对象开始执行AnimationSet
*/
public void Alpha() {
AnimationSet animationSet=new AnimationSet(true);
AlphaAnimation alphaAnimation=new AlphaAnimation(1, 0);
alphaAnimation.setDuration(2000);
animationSet.addAnimation(alphaAnimation);
imageView.startAnimation(animationSet);
}
public void Rotata(){
AnimationSet animationSet=new AnimationSet(true);
//后面的四个参数定义的是旋转的圆心位置
RotateAnimation rotateAnimation=new RotateAnimation(
0, 360,
Animation.RELATIVE_TO_PARENT, 1f,
Animation.RELATIVE_TO_PARENT, 0f);
rotateAnimation.setDuration(2000);
animationSet.addAnimation(rotateAnimation);
imageView.startAnimation(animationSet);
}
public void Scale() {
AnimationSet animationSet=new AnimationSet(true);
ScaleAnimation scaleAnimation=new ScaleAnimation(
1, 0.1f, 1, 0.1f,
Animation.RELATIVE_TO_SELF, 0.5f,
Animation.RELATIVE_TO_SELF, 0.5f);
scaleAnimation.setDuration(2000);
animationSet.addAnimation(scaleAnimation);
imageView.startAnimation(scaleAnimation);
}
public void Translate() {
AnimationSet animationSet=new AnimationSet(true);
TranslateAnimation translateAnimation=new TranslateAnimation(
Animation.RELATIVE_TO_SELF, 0f, //X轴的开始位置
Animation.RELATIVE_TO_SELF, 0.5f, //X轴的结束位置
Animation.RELATIVE_TO_SELF, 0f, //Y轴的开始位置
Animation.RELATIVE_TO_SELF, 1.0f); //Y轴的结束位置
translateAnimation.setDuration(2000);
animationSet.addAnimation(translateAnimation);
/*
* 第一行的设置如果为true，则动画执行完之后效果定格在执行完之后的状态
* 第二行的设置如果为false，则动画执行完之后效果定格在执行完之后的状态
* 第三行设置的是一个long类型的值，是指动画延迟多少毫秒之后执行
* 第四行定义的是动画重复几次执行
*/
animationSet.setFillAfter(true);
animationSet.setFillBefore(false);
animationSet.setStartOffset(2000);
animationSet.setRepeatCount(3);
imageView.startAnimation(animationSet);
}
public void Alpha_Translate() {
AnimationSet animationSet=new AnimationSet(true);
AlphaAnimation alphaAnimation=new AlphaAnimation(1, 0);
alphaAnimation.setDuration(2000);
animationSet.addAnimation(alphaAnimation);
TranslateAnimation translateAnimation=new TranslateAnimation(
Animation.RELATIVE_TO_SELF, 0f, //X轴的开始位置
Animation.RELATIVE_TO_SELF, 0.5f, //X轴的结束位置
Animation.RELATIVE_TO_SELF, 0f, //Y轴的开始位置
Animation.RELATIVE_TO_SELF, 1.0f); //Y轴的结束位置
translateAnimation.setDuration(2000);
animationSet.addAnimation(translateAnimation);
imageView.startAnimation(animationSet);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_animations_, menu);
return true;
}
}
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