标签: onscrollchanged

我在滚动视图中的文本视图中有一个固定的内容.当用户滚动到某个位置时,我想开始一个活动或触发一个Toast.

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent" android:layout_height="fill_parent"
 android:id="@+id/scroller">
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical" android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <TextView android:layout_width="fill_parent" android:id="@+id/story"
   android:layout_height="wrap_content" android:text="@string/lorem"
   android:gravity="fill" />
 </LinearLayout>
</ScrollView>

我的问题是实现受保护的方法onScrollChanged来找出滚动视图的位置.

我找到了这个答案,是否有一个更简单的解决方案,而不是声明一个界面,覆盖滚动视图等,如我发布的链接上所示？

我已经实现了一个recyclerview,我在其中添加纹理视图作为列表项来播放来自url的视频.现在像藤蔓和Instagram应用程序我想播放视频,当它在recyclerview中可见,并在listitem离开屏幕时停止/暂停视频.以下是我的代码:

VideosAdapter类:

public class VideosAdapter extends RecyclerView.Adapter<VideosAdapter.ViewHolder> {

private static String TAG = "VideosAdapter";

Context context;
private ArrayList<String> urls;
RecyclerView recyclerView;

public static class ViewHolder extends RecyclerView.ViewHolder {

    public TextureView textureView;
    public TextView textView;

    public ViewHolder(View v) {
        super(v);
        textureView = (TextureView) v.findViewById(R.id.textureView);
        textView = (TextView) v.findViewById(R.id.textView);

    }
}

public VideosAdapter(Context context, RecyclerView recyclerView, final ArrayList<String> urls) {

    this.context = context;
    this.recyclerView = recyclerView;
    this.urls = urls;

    recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) { …

我已经实现了一个侦听器类来检测滚动视图的结尾,参考链接https://gist.github.com/marteinn/9427072

public class ResponsiveScrollView extends ScrollView {

private OnBottomReachedListener listener;

public ResponsiveScrollView(Context context) {
    super(context);
}

@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
    View view = getChildAt(getChildCount()-1);
    int diff = view.getBottom()-(getHeight()+getScrollY());
    if (diff == 0 && listener!= null) {
        listener.onBottomReached(this);
    }
    super.onScrollChanged(l, t, oldl, oldt);
}

public OnBottomReachedListener getBottomChangedListener() {
        return listener;
}

public void setBottomReachesListener(OnBottomReachedListener onBottomReachedListener) {
    this.listener = onBottomReachedListener;
}

public interface OnBottomReachedListener {
    public void onBottomReached(View view);
   }
}

监听器设置为scrollView:

scrollView.setBottomReachesListener(new …

我正在编写一个具有 NestedScrollView 的应用程序。我想处理滚动是否发生变化。我在互联网上搜索，发现我必须创建自定义 ScrollView。这是我的代码：

public interface OnScrollChangedListener {

    void onScrollChanged(MyScrollView nestedScrollView, int l, int t, int oldl, int oldt);

}

首先，我创建了一个界面来处理滚动更改，然后我创建了自定义 NestedScrollView

public class MyScrollView extends NestedScrollView{

    private OnScrollChangedListener onScrollChangedListener;

    public void setOnScrollChangedListener(OnScrollChangedListener onScrollChangedListener) {
        this.onScrollChangedListener = onScrollChangedListener;
    }

    public MyScrollView(Context context) {
        super(context);
    }

    public MyScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MyScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, …