1、屏幕切换指的是在同一个Activity内屏幕见的切换,最长见的情况就是在一个FrameLayout内有多个页面,比如一个系统设置页面;一个个性化设置页面。
ViewFlipper
java.lang.Object | |||||
↳ | android.view.View | ||||
↳ | android.view.ViewGroup | ||||
↳ | android.widget.FrameLayout | ||||
↳ | android.widget.ViewAnimator | ||||
↳ | android.widget.ViewFlipper |
Class Overview
Simple ViewAnimator
that will animate between two or more views that have been added to it. Only one child is shown at a time. If requested, can automatically flip between each child at a regular interval.
意思是:简单的ViewAnimator之间,两个或两个以上的view加上动画效果。只有一个小孩会显示在一个时间。如果需要,每个孩子能自动翻转之间在固定的时间间隔。
该类有如下几个和动画相关的函数:
setInAnimation:设置View进入屏幕时候使用的动画,该函数有两个版本,一个接受单个参数,类型为android.view.animation.Animation;一个接受两个参数,类型为Context和int,分别为Context对象和定义Animation的resourceID。
setOutAnimation: 设置View退出屏幕时候使用的动画,参数setInAnimation函数一样。
showNext: 调用该函数来显示FrameLayout里面的下一个View。
showPrevious: 调用该函数来显示FrameLayout里面的上一个View。
3、首选看一下定义四个动画的xml文件:
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<? xml version = "1.0" encoding = "utf-8" ?>
< set xmlns:android = "http://schemas.android.com/apk/res/android" >
< translate
android:duration = "3000"
android:fromXDelta = "-100%p"
android:toXDelta = "0" />
</ set >
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out_leftright.xml——从左到右出去屏幕
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<? xml version = "1.0" encoding = "utf-8" ?>
< set xmlns:android = "http://schemas.android.com/apk/res/android" >
< translate
android:duration = "3000"
android:fromXDelta = "0"
android:toXDelta = "100%p" />
</ set >
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in_rightleft.xml——从右到左进入屏幕
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<? xml version = "1.0" encoding = "utf-8" ?>
< set xmlns:android = "http://schemas.android.com/apk/res/android" >
< translate
android:duration = "3000"
android:fromXDelta = "100%p"
android:toXDelta = "0" />
</ set >
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out_rightleft.xml——从右到左出去屏幕
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<? xml version = "1.0" encoding = "utf-8" ?>
< set xmlns:android = "http://schemas.android.com/apk/res/android" >
< translate
android:duration = "3000"
android:fromXDelta = "100%p"
android:toXDelta = "0" />
</ set >
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4、定义main.xml文件
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<? xml version = "1.0" encoding = "utf-8" ?>
< LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
android:layout_width = "fill_parent" android:layout_height = "fill_parent"
android:orientation = "vertical" >
< ViewFlipper android:id = "@+id/viewFlipper"
android:layout_width = "fill_parent" android:layout_height = "fill_parent" >
<!-- 第一个页面 -->
< LinearLayout android:layout_width = "fill_parent"
android:layout_height = "fill_parent" android:gravity = "center" >
< ImageView android:layout_width = "wrap_content"
android:layout_height = "wrap_content" android:src = "@drawable/a1" />
</ LinearLayout >
<!-- 第二个页面 -->
< LinearLayout android:layout_width = "fill_parent"
android:layout_height = "fill_parent" android:gravity = "center" >
< ImageView android:layout_width = "wrap_content"
android:layout_height = "wrap_content" android:src = "@drawable/a2"
android:gravity = "center" />
</ LinearLayout >
<!-- 第三个页面 -->
< LinearLayout android:layout_width = "fill_parent"
android:layout_height = "fill_parent" android:gravity = "center" >
< ImageView android:layout_width = "wrap_content"
android:layout_height = "wrap_content" android:src = "@drawable/a3"
android:gravity = "center" />
</ LinearLayout >
<!-- 第四个页面 -->
< LinearLayout android:layout_width = "fill_parent"
android:layout_height = "fill_parent" android:gravity = "center" >
< ImageView android:layout_width = "wrap_content"
android:layout_height = "wrap_content" android:src = "@drawable/a4"
android:gravity = "center" />
</ LinearLayout >
</ ViewFlipper >
</ LinearLayout >
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5、java代码实现:
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public class SwitchTest2Activity extends Activity {
ViewFlipper viewFlipper = null ;
float startX;
public void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}
private void init() {
viewFlipper = (ViewFlipper) this .findViewById(R.id.viewFlipper);
}
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
startX = event.getX();
break ;
case MotionEvent.ACTION_UP:
if (event.getX() > startX) { // 向右滑动
viewFlipper.setInAnimation( this , R.anim.in_leftright);
viewFlipper.setOutAnimation( this , R.anim.out_leftright);
viewFlipper.showNext();
} else if (event.getX() < startX) { // 向左滑动
viewFlipper.setInAnimation( this , R.anim.in_rightleft);
viewFlipper.setOutAnimation( this , R.anim.out_rightleft);
viewFlipper.showPrevious();
}
break ;
}
return super .onTouchEvent(event);
}
} |
6、效果图: