如何获得最后的滚动视图位置，滚动视图 [英] How to get last scroll view position, scrollview

问题描述

我使用TableLayout。其中有一个项目，使其滚动我使用Tablelayout内滚动型的100。但我必须检测用户是否已经滚动到最后一行。如果用户已滚动至最后一个视图，然后用户将看到一个吐司消息。
但是，如何知道用户已经滚动到tablelayout的最后一行。我刚才提到从 TableLayout ScrollVie W¯¯里面的code。

I am using TableLayout. which have 100 of items to make it scrollable I am using Tablelayout inside ScrollView. But I have to detect whether the user have scrolled to the last row. If the user have scrolled to the last view then user will be shown a Toast message. But How to know that the user has scrolled to the last row of the tablelayout. I have referred the code from TableLayout inside ScrollView.

http://huuah.com/using-tablelayout-on-android/

推荐答案

如果新的滚动y坐标+滚动视图的高度> =身高的tableview，这意味着你已经到达列表的末尾。

If new scrolled y position + scroll view height >= tableview height that means you have reached the end of list.

要做到这一点，你必须写你custiom滚动视图。

To achieve this you have to write your custiom scrollview.

步骤1 您必须创建扩展滚动型的自定义滚动视图

Step-1 You have to create custom scroll view extending ScrollView

package com.sunil;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.ScrollView;

public class LDObservableScrollView extends ScrollView {

    private LDObservableScrollViewListener scrollViewListener = null;

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

    public LDObservableScrollView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

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

    public void setScrollViewListener(LDObservableScrollViewListener scrollViewListener) {
        this.scrollViewListener = scrollViewListener;
    }

    @Override
    protected void onScrollChanged(int x, int y, int oldx, int oldy) {
        super.onScrollChanged(x, y, oldx, oldy);
        if(scrollViewListener != null) {
            scrollViewListener.onScrollChanged(this, x, y, oldx, oldy);
        }
    }

}

步骤2 创建监听器来检测scrollchanged

Step-2 Create a Listener to detect scrollchanged

包com.sunil;
    进口LDObservableScrollView;

package com.sunil; import LDObservableScrollView;

public interface LDObservableScrollViewListener {

    void onScrollChanged(LDObservableScrollView scrollView, int x, int y, int oldx, int oldy);

}

步骤3 在布局XML而不是滚动型使用自定义的滚动视图

Step-3 in layout xml instead of ScrollView use the custom scroll view

<com.abc.LDObservableScrollView android:layout_width="fill_parent" android:layout_marginTop="1dip"
        android:id="@+id/OLF_ScrollView" android:layout_height="fill_parent" android:background="@drawable/small_list_back">
        <TableLayout android:layout_width="fill_parent" android:id="@+id/OLF_tableLayout_TableLayout" android:layout_height="fill_parent">
        </TableLayout>
    </com.abc.LDObservableScrollView>

步骤4 在活动类或您要检测的滚动事件中使用follwoing code

Step-4 In your activity class or where you want to detect the scroll event use the follwoing code

public class DetectHere implements LDObservableScrollViewListener{
...


LDObservableScrollView scrollView = (LDObservableScrollView)view.findViewById(R.id.OLF_ScrollView);
         scrollView.setScrollViewListener(this);

.....

@Override
    public void onScrollChanged(LDObservableScrollView scrollView, int x,
            int y, int oldx, int oldy) {
        // TODO Auto-generated method stub
        if((scrollView.getHeight()+y) >= tableLayout.getHeight()){
            Log.e("Custom Listener ", "END OF LIST OCCURRED ::");
        }
    }

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