是否有可能在ScrollView中有一个ViewPager？
我试图在ScrollView使用一个ViewPager ，但ViewPager没有出现。 如果我删除ScrollView的ViewPager显示正常。
我已经创build了一个简单的testing项目，具体如下：
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>
活动课：
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) { } }
谢谢你的时间。
我已经明白了
我需要添加android:fillViewport="true"到ScrollView元素。
是的，可以在scrollview中使用viewpager。
使用下面的代码，你会实现你的目标，我也做了同样的代码。
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; }
希望这可以帮助某人解决ScrollView中的嵌套ViewPager的滚动问题。
这个解决scheme对于我来说是非常有用的
http://www.henning.ms/2013/09/09/viewpager-that-simply-dont-measure-up/
在xml scrollview把android:fullViewPorts=true和android:layout_height=wrap_content
在自定义viewpager中，也是android:layout_height=wrap_content
你为什么要这么做？ 如果需要，更自然的方法是将每个页面包装在ScrollView中。
