android PullToRrefresh自定义下拉刷新动画


首先，下载著名的刷新框架https://github.com/chrisbanes/Android-PullToRefresh，其中simple为demo，library和extras作为项目包导入到simple中

一，定义刷新动画的layout

在library下的com.handmark.pulltorefresh.library.internal包中的FlipLoadingLayout和RotateLoadingLayout

FlipLoadingLayout为ios风格的箭头颠倒的刷新动画

RotateLoadingLayout为android风格的图片旋转动画

共同的设置方法是

1，getDefaultDrawableResId()

动画默认图片，可以替换为自己的图片

2，refreshingImpl()

正在刷新时的回调方法，可以设置开始动画

3，resetImpl()

重置

二，正在刷新时为图片居中旋转的效果

1，首先修改library中的pull_to_refresh_header_vertical.xml，去除文字的layout，图片layout水平居中

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<?xml version="1.0" encoding="utf-8"?>  
<merge xmlns:android="http://schemas.android.com/apk/res/android" >  
  
    <FrameLayout  
        android:id="@+id/fl_inner"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:paddingBottom="@dimen/header_footer_top_bottom_padding"  
        android:paddingLeft="@dimen/header_footer_left_right_padding"  
        android:paddingRight="@dimen/header_footer_left_right_padding"  
        android:paddingTop="@dimen/header_footer_top_bottom_padding" >  
  
        <FrameLayout  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content"  
            android:layout_gravity="center_horizontal" >  
  
            <ImageView  
                android:id="@+id/pull_to_refresh_image"  
                android:layout_width="wrap_content"  
                android:layout_height="wrap_content"  
                android:layout_gravity="center" />  
  
            <ProgressBar  
                android:id="@+id/pull_to_refresh_progress"  
                style="?android:attr/progressBarStyleSmall"  
                android:layout_width="wrap_content"  
                android:layout_height="wrap_content"  
                android:layout_gravity="center"  
                android:indeterminate="true"  
                android:visibility="gone" />  
        </FrameLayout>  
  
     <!--    <LinearLayout  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content"  
            android:layout_gravity="center"  
            android:gravity="center_horizontal"  
            android:orientation=
10379
"vertical" >  
  
            <TextView  
                android:id="@+id/pull_to_refresh_text"  
                android:layout_width="wrap_content"  
                android:layout_height="wrap_content"  
                android:singleLine="true"  
                android:textAppearance="?android:attr/textAppearance"  
                android:textStyle="bold" />  
  
            <TextView  
                android:id="@+id/pull_to_refresh_sub_text"  
                android:layout_width="wrap_content"  
                android:layout_height="wrap_content"  
                android:singleLine="true"  
                android:textAppearance="?android:attr/textAppearanceSmall"  
                android:visibility="gone" />  
        </LinearLayout> -->  
    </FrameLayout>  
  
</merge>  

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android" >

<FrameLayout
android:id="@+id/fl_inner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingBottom="@dimen/header_footer_top_bottom_padding"
android:paddingLeft="@dimen/header_footer_left_right_padding"
android:paddingRight="@dimen/header_footer_left_right_padding"
android:paddingTop="@dimen/header_footer_top_bottom_padding" >

<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal" >

<ImageView
android:id="@+id/pull_to_refresh_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" />

<ProgressBar
android:id="@+id/pull_to_refresh_progress"
style="?android:attr/progressBarStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:indeterminate="true"
android:visibility="gone" />
</FrameLayout>

<!--    <LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center_horizontal"
android:orientation="vertical" >

<TextView
android:id="@+id/pull_to_refresh_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="true"
android:textAppearance="?android:attr/textAppearance"
android:textStyle="bold" />

<TextView
android:id="@+id/pull_to_refresh_sub_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="true"
android:textAppearance="?android:attr/textAppearanceSmall"
android:visibility="gone" />
</LinearLayout> -->
</FrameLayout>

</merge>

2，去除LoadingLayout中的关于textview的代码

3，可以在RotateLoadingLayout中的getDefaultDrawableResId()方法替换成自己的图片

三，设置自定义动画效果

1，首先设置一个简单的小人走的动画效果，在anim文件夹下新建一个xml，需要加载两张图片，控制图片的停留时间

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<?xml version="1.0" encoding="utf-8"?>    
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"    
    android:oneshot="false" >    
    
    <item    
        android:drawable="@drawable/app_loading0"    
        android:duration="150"/>    
    <item    
        android:drawable="@drawable/app_loading1"    
        android:duration="150"/>    
    
</animation-list>    

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
android:oneshot="false" >

<item
android:drawable="@drawable/app_loading0"
android:duration="150"/>
<item
android:drawable="@drawable/app_loading1"
android:duration="150"/>

</animation-list>

2，新建刷新动画的layout，TweenAnimLoadingLayout，类似于之前的源码中的FlipLoadingLayout和RotateLoadingLayout

主要设置初始化，和那几个关键方法就行

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package com.handmark.pulltorefresh.library.internal;  
  
  
import com.handmark.pulltorefresh.library.R;  
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;  
import com.handmark.pulltorefresh.library.PullToRefreshBase.Orientation;  
  
import android.content.Context;  
import android.content.res.TypedArray;  
import android.graphics.drawable.AnimationDrawable;  
import android.graphics.drawable.Drawable;  
import android.view.View;  
  
/** 
 * @date 2015/1/8 
 * @author wuwenjie 
 * @desc 帧动画加载布局 
 */  
public class TweenAnimLoadingLayout extends LoadingLayout {  
  
    private AnimationDrawable animationDrawable;  
  
    public TweenAnimLoadingLayout(Context context, Mode mode,  
            Orientation scrollDirection, TypedArray attrs) {  
        super(context, mode, scrollDirection, attrs);  
        // 初始化  
        mHeaderImage.setImageResource(R.anim.loading);  
        animationDrawable = (AnimationDrawable) mHeaderImage.getDrawable();  
    }  
    // 默认图片  
    @Override  
    protected int getDefaultDrawableResId() {  
        return R.drawable.app_loading0;  
    }  
      
    @Override  
    protected void onLoadingDrawableSet(Drawable imageDrawable) {  
        // NO-OP  
    }  
      
    @Override  
    protected void onPullImpl(float scaleOfLayout) {  
        // NO-OP  
    }  
    // 下拉以刷新  
    @Override  
    protected void pullToRefreshImpl() {  
        // NO-OP  
    }  
    // 正在刷新时回调  
    @Override  
    protected void refreshingImpl() {  
        // 播放帧动画  
        animationDrawable.start();  
    }  
    // 释放以刷新  
    @Override  
    protected void releaseToRefreshImpl() {  
        // NO-OP  
    }  
    // 重新设置  
    @Override  
    protected void resetImpl() {  
        mHeaderImage.setVisibility(View.VISIBLE);  
        mHeaderImage.clearAnimation();  
    }  
  
}  

package com.handmark.pulltorefresh.library.internal;

import com.handmark.pulltorefresh.library.R;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Orientation;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.drawable.Drawable;
import android.view.View;

/**
* @date 2015/1/8
* @author wuwenjie
* @desc 帧动画加载布局
*/
public class TweenAnimLoadingLayout extends LoadingLayout {

private AnimationDrawable animationDrawable;

public TweenAnimLoadingLayout(Context context, Mode mode,
Orientation scrollDirection, TypedArray attrs) {
super(context, mode, scrollDirection, attrs);
// 初始化
mHeaderImage.setImageResource(R.anim.loading);
animationDrawable = (AnimationDrawable) mHeaderImage.getDrawable();
}
// 默认图片
@Override
protected int getDefaultDrawableResId() {
return R.drawable.app_loading0;
}

@Override
protected void onLoadingDrawableSet(Drawable imageDrawable) {
// NO-OP
}

@Override
protected void onPullImpl(float scaleOfLayout) {
// NO-OP
}
// 下拉以刷新
@Override
protected void pullToRefreshImpl() {
// NO-OP
}
// 正在刷新时回调
@Override
protected void refreshingImpl() {
// 播放帧动画
animationDrawable.start();
}
// 释放以刷新
@Override
protected void releaseToRefreshImpl() {
// NO-OP
}
// 重新设置
@Override
protected void resetImpl() {
mHeaderImage.setVisibility(View.VISIBLE);
mHeaderImage.clearAnimation();
}

}

3，替换之前的刷新layout为TweenAnimLoadingLayout

找到library项目com.handmark.pulltorefresh.library包下的PullToRefreshListView，发现头脚的layout用的都是LoadingLayout，找到头脚layout的创建方法createLoadingLayout进入，在createLoadingLayout方法中再进入createLoadingLayout，找到最原始的新建动画layout的地方，把默认的RotateLoadingLayout改成TweenAnimLoadingLayout就行了

在PullToRefreshBase类下，变为

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//在最原始的地方把新建动画layout换成TweenAnimLoadingLayout  
        LoadingLayout createLoadingLayout(Context context, Mode mode, Orientation scrollDirection, TypedArray attrs) {  
            switch (this) {  
                case ROTATE:  
                default:  
//                  return new RotateLoadingLayout(context, mode, scrollDirection, attrs);  
                    return new TweenAnimLoadingLayout(context, mode, scrollDirection, attrs);  
                case FLIP:  
                    return new FlipLoadingLayout(context, mode, scrollDirection, attrs);  
            }  
        }  

//在最原始的地方把新建动画layout换成TweenAnimLoadingLayout
LoadingLayout createLoadingLayout(Context context, Mode mode, Orientation scrollDirection, TypedArray attrs) {
switch (this) {
case ROTATE:
default:
//					return new RotateLoadingLayout(context, mode, scrollDirection, attrs);
return new TweenAnimLoadingLayout(context, mode, scrollDirection, attrs);
case FLIP:
return new FlipLoadingLayout(context, mode, scrollDirection, attrs);
}
}

4，去除LoadingLayout中的关于textview的代码