Android UI- PullToRrefresh自定义下拉刷新动画
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本篇博文要给大家分享的是如何使用修改开源项目PullToRrefresh下拉刷新的动画，来满足我们开发当中特定的需求，我们比较常见的一种下拉刷新样式可能是以下这种：
就是下拉列表的时候两个箭头上下翻转，更改日期文本和刷新状态，这种是最普遍的一种模式，
Android UI PullToRrefresh自定义下拉刷新动画
。另外一种是旋转动画，就是刷新的时候一个圈不停的旋转，类似南方周末阅读器（注：是小巫公司的一个产品，各位多多支持O(∩_∩)O）：
github地址：https://github.com/devilWwj/Android-PullToRefresh
下载下来之后，import到工作空间，导入到目标项目中去，不清楚如何导入关联项目的童鞋请自行百度。
我这里要实现的一种效果是下拉刷新时播放一个帧动画
增加动画列表：
<?xml version="1.0" encoding="utf-8"?><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>
修改下拉刷新布局：
/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>
增加自定义的加载布局
/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 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.drawable.refresh_anim); animationDrawable = (AnimationDrawable) mHeaderImage.getDrawable(); } // 默认图片 @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(); }}我们只要修改开源项目中的LodingLayout代码：
/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); // 修改代码 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); } }}最后就不要让我提供源码了，笔者这里只是提供一个思路，把刷新的头布局更改为我们的自定义布局就行了，
电脑资料
《Android UI PullToRrefresh自定义下拉刷新动画》(https://www.unjs.com)。最终效果是下拉刷新的时候会有一个不停在闪的灯，这里没有录制gif动画，只提供一张截图吧：