JazzyViewPager

　　JazzyViewPager这个项目可以让viewpager有各种绚丽的动画，而且还可以自由扩展。但从官网下载的lib导入时会出现找不到视图的问题，不知道是不是我人品不行，所以我就自己写了lib。总之，本篇就是来讲这些可以有华丽动画的viewpager。

JazzyViewPager项目地址：https://github.com/jfeinstein10/JazzyViewPager

  

一、布局文件

像viewpager一样，直接写一个控件即可。

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"     android:background="#00ff00">    <com.jfeinstein.jazzyviewpager.JazzyViewPager        xmlns:app="http://schemas.android.com/apk/res-auto"        android:id="@+id/jazzyViewPager"        android:layout_width="match_parent"        android:layout_height="match_parent" >    </com.jfeinstein.jazzyviewpager.JazzyViewPager></LinearLayout>

 

它里面还有很多属性可以定义的，像上面的可以用app这个命名空间来定义属性。下面是各种属性，基本就是各种动画，和淡入淡出效果

fadeEnable:是否有淡入淡出效果

outLineEnable:viewpager一个视图周边是否有边框

outLineColor:边框颜色

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="JazzyViewPager">        <attr name="style">            <enum name="standard" value="0" />            <enum name="tablet" value="1" />            <enum name="cubein" value="2" />            <enum name="cubeout" value="3" />            <enum name="flipvertical" value="4" />            <enum name="fliphorizontal" value="5" />            <enum name="stack" value="6" />            <enum name="zoomin" value="7" />            <enum name="zoomout" value="8" />            <enum name="rotateup" value="9" />            <enum name="rotatedown" value="10" />            <enum name="accordion" value="11" />        </attr>        <attr name="fadeEnabled" format="boolean" />        <attr name="outlineEnabled" format="boolean" />        <attr name="outlineColor" format="color|reference" />    </declare-styleable></resources> 

 

二、java代码实现

2.1首先看看它有什么动画效果，至于各种动画是什么样的，自己去试试吧~

* Standard
* Tablet
* CubeIn
* CubeOut
* FlipVertical
* FlipHorizontal
* Stack
* ZoomIn
* ZoomOut
* RotateUp
* RotateDown
* Accordion

 

2.2设置动画的方法

viewPager.setTransitionEffect(TransitionEffect.Tablet);

or

TransitionEffect effect = TransitionEffect.valueOf("Tablet");
setupJazziness(effect);

 

2.3简单设置

viewPager.setPageMargin(100);//两个页面之间的间距
viewPager.setFadeEnabled(true);//有淡入淡出效果
viewPager.setOutlineEnabled(true);//有边框
viewPager.setOutlineColor(0xff0000ff);//边框颜色

 

2.4适配器的写法

这里已经写的很简单了，以后照猫画虎就行。主要就是里面需要用这个viewpager做一些事情。

官方文档中说：Due to the limitations of the ViewPager class (which JazzyViewPager is built upon) in order to get the animations to work correctly for more than 3 Views, you'll have to add the following to theinstantiateItem method of your PagerAdapter.

private JazzyViewPager mJazzy;/* ... */@Overridepublic Object instantiateItem(ViewGroup container, final int position) {    Object obj = super.instantiateItem(container, position);    mJazzy.setObjectForPosition(obj, position);    return obj;}

 

大概意思就是如果viewpager中的view超过3个了，就需要添加上面这个方法。这里面的obj就是一个view对象，具体参照下面的例子。

例子：

    /**     * @author:Jack Tony     * @tips  :下面的方法需要注意，尽量按照这种写法。     * @date  :2014-10-22     */    class MyAdapter extends PagerAdapter{        @Override        public int getCount() {            // TODO 自动生成的方法存根            return 10;        }        @Override        public boolean isViewFromObject(View view, Object obj) {            if (view instanceof OutlineContainer) {                return ((OutlineContainer) view).getChildAt(0) == obj;            } else {                return view == obj;            }        }                /* 如果viewpager中的view超过3个就需要重写这个方法*/          @Override          public Object instantiateItem(ViewGroup container, final int position) {              TextView tv = new TextView(getApplicationContext());            tv.setText("Page " + (position + 1));            tv.setTextColor(Color.parseColor("#000000"));            tv.setTextSize(30);            tv.setGravity(Gravity.CENTER);            tv.setBackground(getWallpaper());            container.addView(tv, LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);                        //这句话必须要写，按不同的位置添加视图            viewPager.setObjectForPosition(tv, position);            return tv;          }                @Override        public void destroyItem(ViewGroup container, int position, Object obj) {            container.removeView(viewPager.findViewFromObject(position));        }    }

 

ok，这样就基本搞定了。贴上全部代码：

MainActivity.java

package com.kale.jazzviewpagertest;import android.app.ActionBar.LayoutParams;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.support.v4.view.PagerAdapter;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import com.jfeinstein.jazzyviewpager.JazzyViewPager;import com.jfeinstein.jazzyviewpager.JazzyViewPager.TransitionEffect;import com.jfeinstein.jazzyviewpager.OutlineContainer;public class MainActivity extends Activity {    private JazzyViewPager viewPager;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                viewPager = (JazzyViewPager)findViewById(R.id.jazzyViewPager);        /**         * 添加动画效果，可以设置很多动画效果。如：         * Standard         * Tablet         * CubeIn         * CubeOut         * FlipVertical         * FlipHorizontal         * Stack         * ZoomIn         * ZoomOut         * RotateUp         * RotateDown         * Accordion         *          * 下面是可以通过字符串来产生动画对象的例子：         * TransitionEffect effect = TransitionEffect.valueOf("Tablet");         * setupJazziness(effect);         */        viewPager.setTransitionEffect(TransitionEffect.Tablet);        viewPager.setPageMargin(100);//两个页面之间的间距        viewPager.setFadeEnabled(true);//有淡入淡出效果        viewPager.setOutlineEnabled(true);//有边框        viewPager.setOutlineColor(0xff0000ff);//边框颜色        /**         * 设置适配器         * 但当ViewPager中的子View超过三个的时候，我们需要对PagerAdapter修改，         * 重写InstantiateItem()方法         */        viewPager.setAdapter(new MyAdapter());                viewPager.setOnPageChangeListener(null);//可以监听page的改变    }        /**     * @author:Jack Tony     * @tips  :下面的方法需要注意，尽量按照这种写法。     * @date  :2014-10-22     */    class MyAdapter extends PagerAdapter{        @Override        public int getCount() {            // TODO 自动生成的方法存根            return 10;        }        @Override        public boolean isViewFromObject(View view, Object obj) {            if (view instanceof OutlineContainer) {                return ((OutlineContainer) view).getChildAt(0) == obj;            } else {                return view == obj;            }        }                /* 如果viewpager中的view超过3个就需要重写这个方法*/          @Override          public Object instantiateItem(ViewGroup container, final int position) {              TextView tv = new TextView(getApplicationContext());            tv.setText("Page " + (position + 1));            tv.setTextColor(Color.parseColor("#000000"));            tv.setTextSize(30);            tv.setGravity(Gravity.CENTER);            tv.setBackground(getWallpaper());            container.addView(tv, LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);                        //这句话必须要写，按不同的位置添加视图            viewPager.setObjectForPosition(tv, position);            return tv;          }                @Override        public void destroyItem(ViewGroup container, int position, Object obj) {            container.removeView(viewPager.findViewFromObject(position));        }    }}

 

最终效果：

 

扩展：

 

我们当然可以继续扩展动画，下面就扩展一个动画。

一、先定义一个动画名字，这里叫test

public enum TransitionEffect {        Standard,        Tablet,        CubeIn,        CubeOut,        FlipVertical,        FlipHorizontal,        Stack,        ZoomIn,        ZoomOut,        RotateUp,        RotateDown,        Accordion,        Test;}

 

二、写实现方式

protected void animateTest(View left, View right, float positionOffset) {     if (mState != State.IDLE) {  if (left != null) {   //此处增加具体动画 }  if (right != null) {   //此处增加具体动画实现  } }}

 

这里举一个源码中table的例子

    protected void animateTablet(View left, View right, float positionOffset) {                if (mState != State.IDLE) {            if (left != null) {                manageLayer(left, true);                mRot = 30.0f * positionOffset;                mTrans = getOffsetXForRotation(mRot, left.getMeasuredWidth(),                        left.getMeasuredHeight());                ViewHelper.setPivotX(left, left.getMeasuredWidth()/2);                ViewHelper.setPivotY(left, left.getMeasuredHeight()/2);                ViewHelper.setTranslationX(left, mTrans);                ViewHelper.setRotationY(left, mRot);                logState(left, "Left");            }            if (right != null) {                manageLayer(right, true);                mRot = -30.0f * (1-positionOffset);                mTrans = getOffsetXForRotation(mRot, right.getMeasuredWidth(),                         right.getMeasuredHeight());                ViewHelper.setPivotX(right, right.getMeasuredWidth()*0.5f);                ViewHelper.setPivotY(right, right.getMeasuredHeight()*0.5f);                ViewHelper.setTranslationX(right, mTrans);                ViewHelper.setRotationY(right, mRot);                logState(right, "Right");            }        }    }

 

三、添加实现代码到设置项中

@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {  if (mState == State.IDLE && positionOffset > 0) {  oldPage = getCurrentItem();  mState = position == oldPage ? State.GOING_RIGHT : State.GOING_LEFT;}boolean goingRight = position == oldPage;    if (mState == State.GOING_RIGHT && !goingRight)  mState = State.GOING_LEFT;  else if (mState == State.GOING_LEFT && goingRight)  mState = State.GOING_RIGHT;  float effectOffset = isSmall(positionOffset) ? 0 : positionOffset;  // mLeft = getChildAt(position);  // mRight = getChildAt(position+1);  mLeft = findViewFromObject(position);  mRight = findViewFromObject(position+1);  if (mFadeEnabled)  animateFade(mLeft, mRight, effectOffset);  if (mOutlineEnabled)  animateOutline(mLeft, mRight);  switch (mEffect) {  case Standard:  break;  case Tablet:  animateTablet(mLeft, mRight, effectOffset);  break;  case CubeIn:  animateCube(mLeft, mRight, effectOffset, true);  break;  case CubeOut:  animateCube(mLeft, mRight, effectOffset, false);  break;  case FlipVertical:  animateFlipVertical(mLeft, mRight, positionOffset, positionOffsetPixels);  break;  case FlipHorizontal:  animateFlipHorizontal(mLeft, mRight, effectOffset, positionOffsetPixels);  case Stack:  animateStack(mLeft, mRight, effectOffset, positionOffsetPixels);  break;  case ZoomIn:  animateZoom(mLeft, mRight, effectOffset, true);  break;  case ZoomOut:  animateZoom(mLeft, mRight, effectOffset, false);  break;  case RotateUp:  animateRotate(mLeft, mRight, effectOffset, true);  break;  case RotateDown:  animateRotate(mLeft, mRight, effectOffset, false);  break;  case Accordion:  animateAccordion(mLeft, mRight, effectOffset);  break;  case Test:  
　　animateTest(mLeft, mRight, effectOffset);  break;}super.onPageScrolled(position, positionOffset, positionOffsetPixels);if (effectOffset == 0) {disableHardwareLayer();mState = State.IDLE;}}

 

原理和思路讲解：http://blog.csdn.net/lmj623565791/article/details/38026503

 

源码下载：http://download.csdn.net/detail/shark0017/8070139

 

参考自：http://blog.csdn.net/t12x3456/article/details/13290349