先来上个图看看效果：
这里我为什么要单独把这个拿出来呢，因为最近才开始接触Android最新的东西，也就是5.0以上的东西，发现Android提供的SwipeToRefreshLayout是没有上拉加载更多的，在网上找了不少第三方提供加载更多的项目，大部分都还在使用以前ListView时候使用的那一套加载更多的效果，但是效果都不是很好，所以萌生了要把这部分单独抽出来的想法。
第一张图就是在下拉刷新以及加载更多的时候的效果，第二张是加载动画，也是可以放大的，不过在某些手机版本上是没效果的。
我给这个Progress命名为：MaterialProgress，这个文件内部完全是从SwipeToRefreshLayout中扒过来，然后删除了一部分影响使用的东西，所以内部还是很多不必须的代码的，所以，有需要的可以适当的删除。
它的主要用处是可以作为自定义加载更多的加载动画，你一定需要这个。
贴一部分主要代码：
/**
* SwipeToRefreshLayout中下拉刷新时的等待圆环
* Created by Sahadev on 2015/11/13.
*/
public class MaterialProgress extends FrameLayout {
<span style="white-space:pre"> </span>...
public MaterialProgress(Context context) {
this(context, null, 0);
}
public MaterialProgress(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public MaterialProgress(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.mRefreshing = false;
this.mTotalDragDistance = -1.0F;
this.mParentScrollConsumed = new int[2];
this.mOriginalOffsetCalculated = false;
this.mActivePointerId = -1;
this.mCircleViewIndex = -1;
this.mRefreshListener = new Animation.AnimationListener() {
public void onAnimationStart(Animation animation) {
}
public void onAnimationRepeat(Animation animation) {
}
public void onAnimationEnd(Animation animation) {
if (MaterialProgress.this.mRefreshing) {
MaterialProgress.this.mProgress.setAlpha(255);
MaterialProgress.this.mProgress.start();
} else {
MaterialProgress.this.mProgress.stop();
MaterialProgress.this.mCircleView.setVisibility(View.VISIBLE);
MaterialProgress.this.setColorViewAlpha(255);
if (MaterialProgress.this.mScale) {
MaterialProgress.this.setAnimationProgress(0.0F);
} else {
MaterialProgress.this.setTargetOffsetTopAndBottom(MaterialProgress.this.mOriginalOffsetTop - MaterialProgress.this.mCurrentTargetOffsetTop, true);
}
}
MaterialProgress.this.mCurrentTargetOffsetTop = MaterialProgress.this.mCircleView.getTop();
}
};
this.mAnimateToCorrectPosition = new Animation() {
public void applyTransformation(float interpolatedTime, Transformation t) {
boolean targetTop = false;
boolean endTarget = false;
int endTarget1;
if (!MaterialProgress.this.mUsingCustomStart) {
endTarget1 = (int) (MaterialProgress.this.mSpinnerFinalOffset - (float) Math.abs(MaterialProgress.this.mOriginalOffsetTop));
} else {
endTarget1 = (int) MaterialProgress.this.mSpinnerFinalOffset;
}
int targetTop1 = MaterialProgress.this.mFrom + (int) ((float) (endTarget1 - MaterialProgress.this.mFrom) * interpolatedTime);
int offset = targetTop1 - MaterialProgress.this.mCircleView.getTop();
MaterialProgress.this.setTargetOffsetTopAndBottom(offset, false);
MaterialProgress.this.mProgress.setArrowScale(1.0F - interpolatedTime);
}
};
this.mPeek = new Animation() {
public void applyTransformation(float interpolatedTime, Transformation t) {
boolean targetTop = false;
boolean endTarget = false;
int endTarget1;
if (!MaterialProgress.this.mUsingCustomStart) {
endTarget1 = (int) (MaterialProgress.this.mSpinnerFinalOffset - (float) Math.abs(MaterialProgress.this.mOriginalOffsetTop));
} else {
endTarget1 = (int) MaterialProgress.this.mSpinnerFinalOffset;
}
int targetTop1 = MaterialProgress.this.mFrom + (int) ((float) (endTarget1 - MaterialProgress.this.mFrom) * interpolatedTime);
int offset = targetTop1 - MaterialProgress.this.mCircleView.getTop();
MaterialProgress.this.setTargetOffsetTopAndBottom(offset, false);
MaterialProgress.this.mProgress.setArrowScale(1.0F - interpolatedTime);
}
};
this.mAnimateToStartPosition = new Animation() {
public void applyTransformation(float interpolatedTime, Transformation t) {
MaterialProgress.this.moveToStart(interpolatedTime);
}
};
this.mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
this.mMediumAnimationDuration = 500;
this.setWillNotDraw(false);
this.mDecelerateInterpolator = new DecelerateInterpolator(2.0F);
TypedArray a = context.obtainStyledAttributes(attrs, LAYOUT_ATTRS);
this.setEnabled(a.getBoolean(0, true));
a.recycle();
DisplayMetrics metrics = this.getResources().getDisplayMetrics();
this.mCircleWidth = (int) (40.0F * metrics.density);
this.mCircleHeight = (int) (40.0F * metrics.density);
this.createProgressView();
ViewCompat.setChildrenDrawingOrderEnabled(this, true);
this.mSpinnerFinalOffset = 64.0F * metrics.density;
this.mTotalDragDistance = this.mSpinnerFinalOffset;
this.mNestedScrollingParentHelper = new NestedScrollingParentHelper(this);
this.mNestedScrollingChildHelper = new NestedScrollingChildHelper(this);
this.setNestedScrollingEnabled(true);
setColorSchemeResources(android.R.color.holo_blue_bright, android.R.color.holo_green_light,
android.R.color.holo_orange_light, android.R.color.holo_red_light);
setRefreshing(true);
this.finishSpinner(mTotalDragDistance + 10);
}
private void setColorViewAlpha(int targetAlpha) {
this.mCircleView.getBackground().setAlpha(targetAlpha);
this.mProgress.setAlpha(targetAlpha);
}
public void setSize(int size) {
if (size == 0 || size == 1) {
DisplayMetrics metrics = this.getResources().getDisplayMetrics();
if (size == 0) {
this.mCircleHeight = this.mCircleWidth = (int) (56.0F * metrics.density);
} else {
this.mCircleHeight = this.mCircleWidth = (int) (40.0F * metrics.density);
}
this.mCircleView.setImageDrawable((Drawable) null);
this.mProgress.updateSizes(size);
this.mCircleView.setImageDrawable(this.mProgress);
}
}
private void createProgressView() {
this.mCircleView = new CircleImageView(this.getContext(), -328966, 20.0F);
this.mProgress = new MaterialProgressDrawable(this.getContext(), this);
this.mProgress.setBackgroundColor(-328966);
this.mCircleView.setImageDrawable(this.mProgress);
this.mCircleView.setVisibility(View.VISIBLE);
this.mCircleView.setPadding(5, 5, 5, 5);//设置一个内边距
this.addView(this.mCircleView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
}
<span style="white-space:pre"> </span>...
public void setRefreshing(boolean refreshing) {
if (refreshing && this.mRefreshing != refreshing) {
this.mRefreshing = refreshing;
boolean endTarget = false;
int endTarget1;
if (!this.mUsingCustomStart) {
endTarget1 = (int) (this.mSpinnerFinalOffset + (float) this.mOriginalOffsetTop);
} else {
endTarget1 = (int) this.mSpinnerFinalOffset;
}
this.setTargetOffsetTopAndBottom(endTarget1 - this.mCurrentTargetOffsetTop, true);
this.mNotify = false;
this.startScaleUpAnimation(this.mRefreshListener);
} else {
this.setRefreshing(refreshing, false);
}
}
<span style="white-space:pre"> </span>...
}
在使用的时候将项目中的JAVA文件拷入工程即可，不用单独作为一个项目，每个环境可能不一样，可能会出现编译错误。快来试试吧。
