是否有可能有一个ViewPager内部的一个滚动型?

Question

我试图用一个 ViewPager 内部的一个 ScrollView, 但 ViewPager 不会出现。如果我删除了 ScrollView 的 ViewPager 出现的罚款。

我已经创建了一个简单的试验项目如下：

main.xml 布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
    <ScrollView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

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

    </ScrollView>
</LinearLayout>

活动类：

public class ScrollViewWithViewPagerActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ViewPager vp = (ViewPager) findViewById(R.id.viewpager);
        vp.setAdapter(new MyPagerAdapter(this));
    }
}

class MyPagerAdapter extends PagerAdapter {

    private Context ctx;

    public MyPagerAdapter(Context context) {
        ctx = context;
    }

    @Override
    public int getCount() {
        return 2;
    }

    @Override
    public Object instantiateItem(View collection, int position) {

        TextView tv =  new TextView(ctx);
        tv.setTextSize(50);
        tv.setTextColor(Color.WHITE);
        tv.setText("SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, " +
                "SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, " +
                "SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, " +
                "SMILE DUDE, SMILE DUDE, SMILE DUDE");

        ((ViewPager) collection).addView(tv);

        return tv;

    }

    @Override
    public void destroyItem(View collection, int position, Object view) {
         ((ViewPager) collection).removeView((View) view);
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    @Override
    public Parcelable saveState() {
        return null;
    }

    @Override
    public void restoreState(Parcelable arg0, ClassLoader arg1) {
    }

    @Override
    public void startUpdate(View arg0) {
    }

    @Override
    public void finishUpdate(View arg0) {
    }
}

感谢您的时间。

Answer 1

我已经想出来的；

我需要加入 android:fillViewport="true" 以该滚动容器元件。

Answer 2

是的这是可能有viewpager内的滚动型.

使用以下代码，你会实现自己的目标，我也做了同样的在我的代码。

 public class WrapContentHeightViewPager extends ViewPager {

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

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

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        int height = 0;

        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);

            child.measure(widthMeasureSpec, View.MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));

            int h = child.getMeasuredHeight();

            if (h > height) height = h;
        }

        heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
 }

 @Override
 public boolean onTouch(View v, MotionEvent event) {
    int dragthreshold = 30;

    int downX = 0;

    int downY = 0;

    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            downX = (int) event.getRawX();

            downY = (int) event.getRawY();

            break;

        case MotionEvent.ACTION_MOVE:
            int distanceX = Math.abs((int) event.getRawX() - downX);

            int distanceY = Math.abs((int) event.getRawY() - downY);

            if (distanceY > distanceX && distanceY > dragthreshold) {
                mViewPager.getParent().requestDisallowInterceptTouchEvent(false);

                mScrollView.getParent().requestDisallowInterceptTouchEvent(true);
            } else if (distanceX > distanceY && distanceX > dragthreshold) {
                mViewPager.getParent().requestDisallowInterceptTouchEvent(true);

                mScrollView.getParent().requestDisallowInterceptTouchEvent(false);
            }

            break;
        case MotionEvent.ACTION_UP:
            mScrollView.getParent().requestDisallowInterceptTouchEvent(false);

            mViewPager.getParent().requestDisallowInterceptTouchEvent(false);

            break;
    }

    return false;
 }

希望这艾滋病的人在解决滚动问题与嵌套ViewPager内的滚动型.

Answer 3

这个解决方案的工作对我来说，具有动态的内容。

http://www.henning.ms/2013/09/09/viewpager-that-simply-dont-measure-up/

在xml ScrollView 把 android:fillViewport=true 和 android:layout_height=wrap_content

在定义ViewPager太投入 android:layout_height=wrap_content

Answer 4

你为什么要这么做？这更自然的方式将是包裹中的每一页 ScrollView 如果你需要。