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Android UI- PullToRrefresh自定義下拉重新整理動畫

 如果覺得本文不錯，麻煩投一票，2014年部落格之星投票地址：http://vote.blog.csdn.net/blogstar2014/details?username=wwj_748#content

 本篇博文要給大家分享的是如何使用修改開源專案PullToRrefresh下拉重新整理的動畫，來滿足我們開發當中特定的需求，我們比較常見的一種下拉重新整理樣式可能是以下這種：

 就是下拉列表的時候兩個箭頭上下翻轉，更改日期文字和重新整理狀態，這種是最普遍的一種模式。

 另外一種是旋轉動畫，就是重新整理的時候一個圈不停的旋轉，類似南方週末閱讀器（注：是小巫公司的一個產品，各位多多支援O(∩_∩)O）：

 github地址：https://github.com/devilWwj/Android-PullToRefresh

 下載下來之後，import到工作空間，匯入到目標專案中去，不清楚如何匯入關聯專案的童鞋請自行百度。

 我這裡要實現的一種效果是下拉重新整理時播放一個幀動畫

增加動畫列表：

<?xml version="1.0" encoding="utf-8"?><!--  根標籤為animation-list，其中oneshot代表著是否只展示一遍，設定為false會不停的迴圈播放動畫 根標籤下，通過item標籤對動畫中的每一個圖片進行宣告 android:duration 表示展示所用的該圖片的時間長度 --><animation-list  xmlns:android="http://schemas.android.com/apk/res/android"  android:oneshot="false"  >   <item android:drawable="@drawable/loading1" android:duration="150"></item>   <item android:drawable="@drawable/loading2" android:duration="150"></item>   <item android:drawable="@drawable/loading3" android:duration="150"></item>   <item android:drawable="@drawable/loading4" android:duration="150"></item></animation-list>
 

/PullToRefresh/res/layout/pull_to_refresh_header_simple.xml

<?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"                android:src="@drawable/loading1"                 />        </FrameLayout>    </FrameLayout></merge>

增加自定義的載入佈局

/PullToRefresh/src/com/handmark/pulltorefresh/library/internal/TweenAnimLoadingLayout.java 

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 幀動畫載入佈局 */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.drawable.refresh_anim);  animationDrawable = (AnimationDrawable) mHeaderImage.getDrawable(); } // 預設圖片 @Override protected int getDefaultDrawableResId() {  return R.drawable.loading1; }  @Override protected void onLoadingDrawableSet(Drawable imageDrawable) {  // NO-OP }  @Override protected void onPullImpl(float scaleOfLayout) {  // NO-OP } // 下拉以重新整理 @Override protected void pullToRefreshImpl() {  // NO-OP } // 正在重新整理時回撥 @Override protected void refreshingImpl() {  // 播放幀動畫  animationDrawable.start(); } // 釋放以重新整理 @Override protected void releaseToRefreshImpl() {  // NO-OP } // 重新設定 @Override protected void resetImpl() {  mHeaderImage.setVisibility(View.VISIBLE);  mHeaderImage.clearAnimation(); }}

/PullToRefresh/src/com/handmark/pulltorefresh/library/internal/LoadingLayout.java

/******************************************************************************* * Copyright 2011, 2012 Chris Banes. * * 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 com.handmark.pulltorefresh.library.internal;import android.annotation.SuppressLint;import android.content.Context;import android.content.res.ColorStateList;import android.content.res.TypedArray;import android.graphics.Typeface;import android.graphics.drawable.AnimationDrawable;import android.graphics.drawable.Drawable;import android.text.TextUtils;import android.util.TypedValue;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.view.animation.Interpolator;import android.view.animation.LinearInterpolator;import android.widget.FrameLayout;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.ProgressBar;import android.widget.TextView;import com.handmark.pulltorefresh.library.ILoadingLayout;import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;import com.handmark.pulltorefresh.library.PullToRefreshBase.Orientation;import com.handmark.pulltorefresh.library.R;@SuppressLint("ViewConstructor")public abstract class LoadingLayout extends FrameLayout implements ILoadingLayout { static final String LOG_TAG = "PullToRefresh-LoadingLayout"; static final Interpolator ANIMATION_INTERPOLATOR = new LinearInterpolator(); private FrameLayout mInnerLayout; protected final ImageView mHeaderImage; protected final ProgressBar mHeaderProgress; private boolean mUseIntrinsicAnimation; private final TextView mHeaderText; private final TextView mSubHeaderText; protected final Mode mMode; protected final Orientation mScrollDirection; private CharSequence mPullLabel; private CharSequence mRefreshingLabel; private CharSequence mReleaseLabel;  public LoadingLayout(Context context, final Mode mode, final Orientation scrollDirection, TypedArray attrs) {  super(context);  mMode = mode;  mScrollDirection = scrollDirection;  switch (scrollDirection) {   case HORIZONTAL:    LayoutInflater.from(context).inflate(R.layout.pull_to_refresh_header_horizontal, this);    break;   case VERTICAL:   default://    LayoutInflater.from(context).inflate(R.layout.pull_to_refresh_header_vertical, this);    // 修改程式碼    LayoutInflater.from(context).inflate(R.layout.pull_to_refresh_header_simple, this);     break;  }  mInnerLayout = (FrameLayout) findViewById(R.id.fl_inner);  mHeaderText = (TextView) mInnerLayout.findViewById(R.id.pull_to_refresh_text);  mHeaderProgress = (ProgressBar) mInnerLayout.findViewById(R.id.pull_to_refresh_progress);  mSubHeaderText = (TextView) mInnerLayout.findViewById(R.id.pull_to_refresh_sub_text);  mHeaderImage = (ImageView) mInnerLayout.findViewById(R.id.pull_to_refresh_image);    FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) mInnerLayout.getLayoutParams();  switch (mode) {   case PULL_FROM_END:    lp.gravity = scrollDirection == Orientation.VERTICAL ? Gravity.TOP : Gravity.LEFT;    // Load in labels    mPullLabel = context.getString(R.string.pull_to_refresh_from_bottom_pull_label);    mRefreshingLabel = context.getString(R.string.pull_to_refresh_from_bottom_refreshing_label);    mReleaseLabel = context.getString(R.string.pull_to_refresh_from_bottom_release_label);    break;   case PULL_FROM_START:   default:    lp.gravity = scrollDirection == Orientation.VERTICAL ? Gravity.BOTTOM : Gravity.RIGHT;    // Load in labels    mPullLabel = context.getString(R.string.pull_to_refresh_pull_label);    mRefreshingLabel = context.getString(R.string.pull_to_refresh_refreshing_label);    mReleaseLabel = context.getString(R.string.pull_to_refresh_release_label);    break;  }  if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderBackground)) {   Drawable background = attrs.getDrawable(R.styleable.PullToRefresh_ptrHeaderBackground);   if (null != background) {    ViewCompat.setBackground(this, background);   }  }//  if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderTextAppearance)) {//   TypedValue styleID = new TypedValue();//   attrs.getValue(R.styleable.PullToRefresh_ptrHeaderTextAppearance, styleID);//   setTextAppearance(styleID.data);//  }//  if (attrs.hasValue(R.styleable.PullToRefresh_ptrSubHeaderTextAppearance)) {//   TypedValue styleID = new TypedValue();//   attrs.getValue(R.styleable.PullToRefresh_ptrSubHeaderTextAppearance, styleID);//   setSubTextAppearance(styleID.data);//  }////  // Text Color attrs need to be set after TextAppearance attrs//  if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderTextColor)) {//   ColorStateList colors = attrs.getColorStateList(R.styleable.PullToRefresh_ptrHeaderTextColor);//   if (null != colors) {//    setTextColor(colors);//   }//  }//  if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderSubTextColor)) {//   ColorStateList colors = attrs.getColorStateList(R.styleable.PullToRefresh_ptrHeaderSubTextColor);//   if (null != colors) {//    setSubTextColor(colors);//   }//  }  // Try and get defined drawable from Attrs  Drawable imageDrawable = null;  if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawable)) {   imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawable);  }  // Check Specific Drawable from Attrs, these overrite the generic  // drawable attr above  switch (mode) {   case PULL_FROM_START:   default:    if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableStart)) {     imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableStart);    } else if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableTop)) {     Utils.warnDeprecation("ptrDrawableTop", "ptrDrawableStart");     imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableTop);    }    break;   case PULL_FROM_END:    if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableEnd)) {     imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableEnd);    } else if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableBottom)) {     Utils.warnDeprecation("ptrDrawableBottom", "ptrDrawableEnd");     imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableBottom);    }    break;  }  // If we don't have a user defined drawable, load the default  if (null == imageDrawable) {   imageDrawable = context.getResources().getDrawable(getDefaultDrawableResId());  }  // Set Drawable, and save width/height  setLoadingDrawable(imageDrawable);  reset(); } public final void setHeight(int height) {  ViewGroup.LayoutParams lp = getLayoutParams();  lp.height = height;  requestLayout(); } public final void setWidth(int width) {  ViewGroup.LayoutParams lp = getLayoutParams();  lp.width = width;  requestLayout(); } public final int getContentSize() {  switch (mScrollDirection) {   case HORIZONTAL:    return mInnerLayout.getWidth();   case VERTICAL:   default:    return mInnerLayout.getHeight();  } } public final void hideAllViews() {//  if (View.VISIBLE == mHeaderText.getVisibility()) {//   mHeaderText.setVisibility(View.INVISIBLE);//  }//  if (View.VISIBLE == mHeaderProgress.getVisibility()) {//   mHeaderProgress.setVisibility(View.INVISIBLE);//  }//  if (View.VISIBLE == mHeaderImage.getVisibility()) {//   mHeaderImage.setVisibility(View.INVISIBLE);//  }//  if (View.VISIBLE == mSubHeaderText.getVisibility()) {//   mSubHeaderText.setVisibility(View.INVISIBLE);//  } } public final void onPull(float scaleOfLayout) {  if (!mUseIntrinsicAnimation) {   onPullImpl(scaleOfLayout);  } } public final void pullToRefresh() {//  if (null != mHeaderText) {//   mHeaderText.setText(mPullLabel);//  }  // Now call the callback  pullToRefreshImpl(); } public final void refreshing() {  if (null != mHeaderText) {   mHeaderText.setText(mRefreshingLabel);  }  if (mUseIntrinsicAnimation) {   ((AnimationDrawable) mHeaderImage.getDrawable()).start();  } else {   // Now call the callback   refreshingImpl();  }//  if (null != mSubHeaderText) {//   mSubHeaderText.setVisibility(View.GONE);//  } } public final void releaseToRefresh() {//  if (null != mHeaderText) {//   mHeaderText.setText(mReleaseLabel);//  }  // Now call the callback  releaseToRefreshImpl(); } public final void reset() {//  if (null != mHeaderText) {//   mHeaderText.setText(mPullLabel);//  }  mHeaderImage.setVisibility(View.VISIBLE);  if (mUseIntrinsicAnimation) {   ((AnimationDrawable) mHeaderImage.getDrawable()).stop();  } else {   // Now call the callback   resetImpl();  }//  if (null != mSubHeaderText) {//   if (TextUtils.isEmpty(mSubHeaderText.getText())) {//    mSubHeaderText.setVisibility(View.GONE);//   } else {//    mSubHeaderText.setVisibility(View.VISIBLE);//   }//  } } @Override public void setLastUpdatedLabel(CharSequence label) {//  setSubHeaderText(label); } @Override public final void setLoadingDrawable(Drawable imageDrawable) {  // Set Drawable  mHeaderImage.setImageDrawable(imageDrawable);  mUseIntrinsicAnimation = (imageDrawable instanceof AnimationDrawable);  // Now call the callback  onLoadingDrawableSet(imageDrawable); } @Override public void setPullLabel(CharSequence pullLabel) {  mPullLabel = pullLabel; } @Override public void setRefreshingLabel(CharSequence refreshingLabel) {  mRefreshingLabel = refreshingLabel; } @Override public void setReleaseLabel(CharSequence releaseLabel) {  mReleaseLabel = releaseLabel; } @Override public void setTextTypeface(Typeface tf) {  mHeaderText.setTypeface(tf); } public final void showInvisibleViews() {//  if (View.INVISIBLE == mHeaderText.getVisibility()) {//   mHeaderText.setVisibility(View.VISIBLE);//  }//  if (View.INVISIBLE == mHeaderProgress.getVisibility()) {//   mHeaderProgress.setVisibility(View.VISIBLE);//  }  if (View.INVISIBLE == mHeaderImage.getVisibility()) {   mHeaderImage.setVisibility(View.VISIBLE);  }//  if (View.INVISIBLE == mSubHeaderText.getVisibility()) {//   mSubHeaderText.setVisibility(View.VISIBLE);//  } } /**  * Callbacks for derivative Layouts  */ protected abstract int getDefaultDrawableResId(); protected abstract void onLoadingDrawableSet(Drawable imageDrawable); protected abstract void onPullImpl(float scaleOfLayout); protected abstract void pullToRefreshImpl(); protected abstract void refreshingImpl(); protected abstract void releaseToRefreshImpl(); protected abstract void resetImpl(); private void setSubHeaderText(CharSequence label) {  if (null != mSubHeaderText) {   if (TextUtils.isEmpty(label)) {    mSubHeaderText.setVisibility(View.GONE);   } else {    mSubHeaderText.setText(label);    // Only set it to Visible if we're GONE, otherwise VISIBLE will    // be set soon    if (View.GONE == mSubHeaderText.getVisibility()) {     mSubHeaderText.setVisibility(View.VISIBLE);    }   }  } } private void setSubTextAppearance(int value) {  if (null != mSubHeaderText) {   mSubHeaderText.setTextAppearance(getContext(), value);  } } private void setSubTextColor(ColorStateList color) {  if (null != mSubHeaderText) {   mSubHeaderText.setTextColor(color);  } } private void setTextAppearance(int value) {  if (null != mHeaderText) {   mHeaderText.setTextAppearance(getContext(), value);  }  if (null != mSubHeaderText) {   mSubHeaderText.setTextAppearance(getContext(), value);  } } private void setTextColor(ColorStateList color) {  if (null != mHeaderText) {   mHeaderText.setTextColor(color);  }  if (null != mSubHeaderText) {   mSubHeaderText.setTextColor(color);  } }}

最後就不要讓我提供原始碼了，筆者這裡只是提供一個思路，把重新整理的頭佈局更改為我們的自定義佈局就行了。

最終效果是下拉重新整理的時候會有一個不停在閃的燈，這裡沒有錄製gif動畫，只提供一張截圖吧：

給我老師的人工智慧教程打call！http://blog.csdn.net/jiangjunshow