对RecyclerViewItem做动画
转载地址：ruzhan123.github.io/2016/07/01/2016-07-01-01-
%E5%AF%B9RecyclerViewItem%E5%81%9A%E5%8A%A8%E7%94%BB/#rd
RecyclerView，ListView这些具有Item复⽤性的View，想要对其Item做动画
需要注意以下⼏点：
1，如果要⼀点击，让所有Item做动画的效果。例如，上图的编辑和取消，这样的动态动画。可以对所有ViewHolder中的View直接做动画。但是需要在onBindViewHolder⽅法中对复⽤的item做静态动画，保证动画状态的平滑衔接。
2，每⼀个Item的特有属性，例如，上图checkbox的选中状态，都需要把状态字段放到对应的Java bean中，并在onBindViewHolder⽅法从java bean取出状态值，设置到view⾥。
⾸先，对⼀些细节进⾏分析：
如何设计⼀个⾃定义View，来让他可以⾃⼰移动，做动画起来？
1，⾸先，创建⼀个View，他是RecyclerView Item的根布局：
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public class SlideRelativeLayout extends RelativeLayout {
public static final String TAG = SimpleName();
private CheckBox mCheckBox;
private RelativeLayout mContentSlide;
private int mOffset;
public SlideRelativeLayout(Context context){
super(context);
}
public SlideRelativeLayout(Context context, AttributeSet attrs){
super(context, attrs);
}
public SlideRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr){
super(context, attrs, defStyleAttr);
}
@Override
protected void onFinishInflate(){
mCheckBox = (CheckBox) findViewById(R.id.item_checkbox);
mContentSlide = (RelativeLayout) findViewById(R.id.item_content_rl);
setOffset(35);
}
public void setOffset(int offset){
mOffset = (int) (getContext().getResources().getDisplayMetrics().density * offset + 0.5f);
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void openAnimation(){
对RecyclerView Item做动画，刚刚开始研究的时候⼀些坑
在这⾥把⼀些设计思路分享出去
添加动态位移，静态位移，缩放等动画，保证了动画状态的平滑衔接
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public void openAnimation(){
ValueAnimator valueAnimator = new ValueAnimator();
valueAnimator.setIntValues(0, 1);
valueAnimator.setDuration(300);
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator){
float fraction = AnimatedFraction();
int endX = (int) (-mOffset * fraction);
doAnimationSet(endX, fraction);
}
});
valueAnimator.start();
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void closeAnimation(){
ValueAnimator valueAnimator = new ValueAnimator();
valueAnimator.setIntValues(0, 1);
valueAnimator.setDuration(150);
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator){
float fraction = AnimatedFraction();
int endX = (int) (-mOffset * (1 - fraction));
doAnimationSet(endX, (1 - fraction));
}
});
valueAnimator.start();
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void doAnimationSet(int dx, float fraction){
mContentSlide.scrollTo(dx, 0);
mCheckBox.setScaleX(fraction);
mCheckBox.setScaleY(fraction);
mCheckBox.setAlpha(fraction * 255);
}
public void open(){
mContentSlide.scrollTo(-mOffset, 0);
}
public void close(){
mContentSlide.scrollTo(0, 0);
}
}
这⾥，在View树创建完毕之后到我们需要做动画的⼦View：1
2 3 4 5 6 7 8@Override
protected void onFinishInflate(){
mCheckBox = (CheckBox) findViewById(R.id.item_checkbox);
mContentSlide = (RelativeLayout) findViewById(R.id.item_content_rl); setOffset(35);
}
然后，设计4个⽅法，分别为：动态的打开动画，动态的关闭动画，静态的打开动画，静态的关闭动画。
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2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void openAnimation(){
ValueAnimator valueAnimator = new ValueAnimator();
valueAnimator.setIntValues(0, 1);
valueAnimator.setDuration(300);
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator){
float fraction = AnimatedFraction();
int endX = (int) (-mOffset * fraction);
doAnimationSet(endX, fraction);
}
});
valueAnimator.start();
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
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public void closeAnimation(){
ValueAnimator valueAnimator = new ValueAnimator();
valueAnimator.setIntValues(0, 1);
valueAnimator.setDuration(150);
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator){
float fraction = AnimatedFraction();
int endX = (int) (-mOffset * (1 - fraction));
doAnimationSet(endX, (1 - fraction));
}
});
valueAnimator.start();
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void doAnimationSet(int dx, float fraction){
mContentSlide.scrollTo(dx, 0);
mCheckBox.setScaleX(fraction);
javabean是干什么的mCheckBox.setScaleY(fraction);
mCheckBox.setAlpha(fraction * 255);
}
public void open(){
mContentSlide.scrollTo(-mOffset, 0);
}
public void close(){
mContentSlide.scrollTo(0, 0);
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void doAnimationSet(int dx, float fraction){
mContentSlide.scrollTo(dx, 0);
mCheckBox.setScaleX(fraction);
mCheckBox.setScaleY(fraction);
mCheckBox.setAlpha(fraction * 255);
}
对⼦View做动画我采取的策略是：使⽤属性动画，在每⼀贞动画⾥获取到对应的值，对⼦View做相应的动画，例如：动态的打开动画。onAnimationUpdate⽅法，显⽰每⼀贞动画都会回调⼀次
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public void openAnimation(){
ValueAnimator valueAnimator = new ValueAnimator();
valueAnimator.setIntValues(0, 1);
valueAnimator.setDuration(300);
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator){
float fraction = AnimatedFraction();
int endX = (int) (-mOffset * fraction);
doAnimationSet(endX, fraction);
}
});
valueAnimator.start();
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void doAnimationSet(int dx, float fraction){
mContentSlide.scrollTo(dx, 0);
mCheckBox.setScaleX(fraction);
mCheckBox.setScaleY(fraction);
mCheckBox.setAlpha(fraction * 255);
25 26 mCheckBox.setAlpha(fraction * 255); }
这样RecylerView 带有动态动画和静态动画的View就设计好了。2，在bind⽅法中使⽤静态动画，动态动画对外提供⽅法调⽤：
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private CheckBox mCheckBox;
private ItemBean mItemBean;
public SlideViewHolder(View itemView){
super(itemView);
mSlideRelativeLayout = (SlideRelativeLayout) itemView.findViewById(R.id.item_root);
mCheckBox = (CheckBox) itemView.findViewById(R.id.item_checkbox);
itemView.setOnClickListener(this);
}
public void bind(ItemBean itemBean){
mItemBean = itemBean;
mCheckBox.setChecked(itemBean.isChecked());
switch (mState) {
case NORMAL:
mSlideRelativeLayout.close();
break;
case SLIDE:
mSlideRelativeLayout.open();
break;
}
}
public void openItemAnimation(){
mSlideRelativeLayout.openAnimation();
}
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