Question

android 向上滑动srcollview 怎么隐藏viewpager里面的布局

Answer 1

借用两个库来快速完成
1. ViewPagerIndicator
2. ObservableScrollView
将两个库引入项目中去，快速的搭建一个ViewPager框架后，在ViewPager每页对应的Fragment的布局中增加一个ListView，这个ListView使用ObservableScrollView库中的ListView
主布局代码，使用线性布局，上方放置indicator，下方放置ViewPager
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<com.viewpagerindicator.TabPageIndicator
android:id="@+id/indicator"
android:layout_width="fill_parent"
android:layout_height="50dp" />

<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent" />

</LinearLayout>

-Fragment代码，放置一个ObservableListView
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="${relativePackage}.${activityClass}" >

<cn.edu.zafu.view.observableview.ObservableListView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" />

</LinearLayout>

业务逻辑代码
在Activity中初始化indicator和viewpager，然后再fragment中处理viewpager中内容即listview手势上下滑动与indicator的联动。在onCreateView中管理indicator，并获取其高度
indicator = (TabPageIndicator) getActivity().findViewById(indicatorId);
//获得indicator高度
indicator.post(new Runnable() {
@Override
public void run() {
height=indicator.getHeight();
Log.d("TAG", "height:"+height);
}
});

关联listview并设置监听器
listView = (ObservableListView) view.findViewById(R.id.list);
listView.setScrollViewCallbacks(this);

fragment实现对应的接口
implements ObservableScrollViewCallbacks

实现的方法如下
@Override
public void onScrollChanged(int scrollY, boolean firstScroll,
boolean dragging) {

}

@Override
public void onDownMotionEvent() {

}

@Override
public void onUpOrCancelMotionEvent(ScrollState scrollState) {

}

在onUpOrCancelMotionEvent方法中完成显示和隐藏indicator
//获得高度的另一种方法
/*if(height==0){
height=indicator.getHeight();
Log.d("TAG", "height:"+height);
}*/
//如果手势向上则隐藏，手势向下则显示
if (scrollState == ScrollState.UP) {
//如果显示的并且动画没有在进行，则隐藏
if (isIndicatorShow&&!isShowing) {
hideIndicator();
}
} else if (scrollState == ScrollState.DOWN) {
//如果没显示的并且动画没有在进行，则显示
if (!isIndicatorShow&&!isShowing) {
showIndicator();
}
}

完成显示和隐藏的函数，使用属性动画完成一个过渡效果
public void showIndicator() {
//属性动画translationY
ObjectAnimator animator = ObjectAnimator.ofFloat(indicator, "translationY",
0f);
//持续时间
animator.setDuration(500);
//插值器，减速
animator.setInterpolator(new DecelerateInterpolator(2));
//监听器
animator.addUpdateListener(new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
//不断增加indicator所在viewgroup的高度
LayoutParams layoutParams = indicator.getLayoutParams();
float v=(Float) animation.getAnimatedValue();
Log.d("TAG","show:"+v);
layoutParams.height=height+(int)v;
//重新布局
indicator.requestLayout();
}
});
animator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
//动画开始后设置为true
isShowing=true;
super.onAnimationStart(animation);
}
@Override
public void onAnimationEnd(Animator animation) {
//动画结束后设置为false
isShowing=false;
//显示后设置为已显示
isIndicatorShow = true;
super.onAnimationEnd(animation);
}

});
//开始动画
animator.start();

}

public void hideIndicator() {

ObjectAnimator animator = ObjectAnimator.ofFloat(indicator, "translationY",-height);
animator.setDuration(500);
//加速插值器
animator.setInterpolator(new AccelerateInterpolator(2));
animator.addUpdateListener(new AnimatorUpdateListener() {

@Override
public void onAnimationUpdate(ValueAnimator animation) {
//不断减小indicator所在viewgroup的高度
LayoutParams layoutParams = indicator.getLayoutParams();
float v=(Float) animation.getAnimatedValue();
Log.d("TAG","hide:"+v);
layoutParams.height=height+(int)v;
indicator.requestLayout();
}
});
//同显示
animator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
isShowing=true;
super.onAnimationStart(animation);
}

@Override
public void onAnimationEnd(Animator animation) {
isShowing=false;
isIndicatorShow = false;
super.onAnimationEnd(animation);
}

});
animator.start();

}

所有用到的变量
private View view = null;//存储fragemnt的视图
private TabPageIndicator indicator = null;//indicator
private ObservableListView listView = null;//listview
private int indicatorId;//indicator对应的id值
private int height=0;//indicator高低
private boolean isIndicatorShow = true;//是否显示
private boolean isShowing=false;//动画是否正在进行

Answer 2

没听懂意思