我创建了一个ScrollView并在一个大的LinearLayout中添加了两个LinearLayout并为这些提供了权重。问题是它在初始状态下显示我的图像滑块图像，一旦我点击了更多图像消失，除了点当我按下读数时，再次显示图像滑块的图像。下面给出了两个截图和代码。我该如何解决？
FragmentSL.xml
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="10">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="4.5"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<LinearLayout
android:id="@+id/SliderDots"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:gravity="center_horizontal"
android:layout_marginBottom="20dp"
android:orientation="horizontal"/>
</RelativeLayout>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="5.5"
android:gravity="center_horizontal">
<TextView
android:id="@+id/aboutsltext"
android:maxLines="3"
android:textSize="22sp"
android:textColor="@color/colorPrimary"
android:text="Sri Lanka (formerly Ceylon) is an island nation south of India in the Indian Ocean. Its diverse landscapes range from rainforest and arid plains to highlands and sandy beaches. It’s famed for its ancient Buddhist ruins, including the 5th-century citadel Sigiriya, with its palace and frescoes. The city of Anuradhapura, Sri Lanka's ancient capital, has many ruins dating back more than 2,000 years. Sri Lanka (formerly Ceylon) is an island nation south of India in the Indian Ocean. Its diverse landscapes range from rainforest and arid plains to highlands and sandy beaches. It’s famed for its ancient Buddhist ruins, including the 5th-century citadel Sigiriya, with its palace and frescoes. The city of Anuradhapura, Sri Lanka's ancient capital, has many ruins dating back more than 2,000 years. "
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/readmorebtn"
android:layout_width="wrap_content"
android:text="Read More"
android:textAllCaps="false"
android:textColor="@color/colorPrimary"
android:background="@drawable/readmorebtn"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
</ScrollView>
FragmentClass.java
public class aboutSLFragment扩展了Fragment {
ViewPager viewPager;
LinearLayout sliderDotspanel;
private int dotscount;
private ImageView[] dots;
TextView aboutsltext;
Button readmorebtn;
public aboutSLFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_about_sl, container, false);
viewPager = (ViewPager) rootView .findViewById(R.id.viewPager);
sliderDotspanel = (LinearLayout)rootView.findViewById(R.id.SliderDots);
ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(getContext());
viewPager.setAdapter(viewPagerAdapter);
dotscount = viewPagerAdapter.getCount();
dots = new ImageView[dotscount];
for(int i = 0; i < dotscount; i++){
dots[i] = new ImageView(getContext());
dots[i].setImageDrawable(ContextCompat.getDrawable(getContext(), R.drawable.non_active_dot));
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
params.setMargins(8, 0, 8, 0);
sliderDotspanel.addView(dots[i], params);
}
dots[0].setImageDrawable(ContextCompat.getDrawable(getContext(), R.drawable.active_dot));
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
for(int i = 0; i< dotscount; i++){
dots[i].setImageDrawable(ContextCompat.getDrawable(getContext(), R.drawable.non_active_dot));
}
dots[position].setImageDrawable(ContextCompat.getDrawable(getContext(), R.drawable.active_dot));
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
aboutsltext=(TextView)rootView.findViewById(R.id.aboutsltext);
readmorebtn=(Button)rootView.findViewById(R.id.readmorebtn);
readmorebtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (readmorebtn.getText().toString().equalsIgnoreCase("Read More"))
{
aboutsltext.setMaxLines(Integer.MAX_VALUE);//your TextView
readmorebtn.setText("Read Less");
}
else
{
aboutsltext.setMaxLines(3);//your TextView
readmorebtn.setText("Read More");
}
}
});
// Inflate the layout for this fragment
return rootView;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
//you can set the title for your toolbar here for different fragments different titles
getActivity().setTitle("About Sri Lanka");
}
}
点击之前点击 before read more button is clicked
计算代码
final View rootView = inflater.inflate(R.layout.fragment_about_sl, container, false);
viewPager = (ViewPager) rootView .findViewById(R.id.viewPager);
ViewTreeObserver vto =(ViewTreeObserver) rootView.findViewById(R.id.aboutslscrollview).getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
rootView.findViewById(R.id.aboutslscrollview).getViewTreeObserver().removeOnGlobalLayoutListener(this);
int scrollViewHeightInPixels = rootView.findViewById(R.id.aboutslscrollview).getMeasuredHeight();
//This is equal with %45 weight you tried before
int height = (scrollViewHeightInPixels * 45) / 100;
ViewGroup.LayoutParams pagerParams = viewPager.getLayoutParams();
pagerParams.height = height;
}
});
final View view = rootView.findViewById(R.id.aboutslscrollview);
ViewTreeObserver vto = view.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
view.getViewTreeObserver().removeOnGlobalLayoutListener(this);
int scrollViewHeightInPixels = view.getMeasuredHeight();
//This is equal with %45 weight you tried before
int height = (scrollViewHeightInPixels * 45) / 100;
ViewGroup.LayoutParams pagerParams = viewPager.getLayoutParams();
pagerParams.height = height;
}
});
答案 0 :(得分：0)
正如我之前评论的那样，你的逻辑将无法正常工作，因为在ScrollView内提供垂直权重会导致计算问题。
因此，您不应使用任何权重来调整ViewPager内容宽度。
如果您有一定的宽高比，请按以下方式以编程方式调整大小。在findViewById之后将这些行写在 onCreate（）中：
UPDATE 您可以像这样获取scrollView高度：
viewPager = (ViewPager) rootView.findViewById(R.id.viewPager);
ViewTreeObserver vto = scrollView.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
scrollView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
int scrollViewHeightInPixels = layout.getMeasuredHeight();
//This is equal with %45 weight you tried before
int height = (scrollViewHeightInPixels * 45) / 100;
ViewGroup.LayoutParams pagerParams = viewPager.getLayoutParams();
pagerParams.height = height;
}
});
然后删除不必要的布局并更改您的布局，如下所示：
viewPager高度为200 dp，启动时为固定高度，wrap_content和match_parent有时会导致问题
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="200dp" />
<LinearLayout
android:id="@+id/SliderDots"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="@id/viewPager"
android:layout_marginBottom="20dp"
android:gravity="center_horizontal"
android:orientation="horizontal" />
</RelativeLayout>
<TextView
android:id="@+id/aboutsltext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:maxLines="3"
android:text="Sri Lanka (formerly Ceylon) is an island nation south of India in the Indian Ocean. Its diverse landscapes range from rainforest and arid plains to highlands and sandy beaches. It’s famed for its ancient Buddhist ruins, including the 5th-century citadel Sigiriya, with its palace and frescoes. The city of Anuradhapura, Sri Lanka's ancient capital, has many ruins dating back more than 2,000 years. Sri Lanka (formerly Ceylon) is an island nation south of India in the Indian Ocean. Its diverse landscapes range from rainforest and arid plains to highlands and sandy beaches. It’s famed for its ancient Buddhist ruins, including the 5th-century citadel Sigiriya, with its palace and frescoes. The city of Anuradhapura, Sri Lanka's ancient capital, has many ruins dating back more than 2,000 years. "
android:textColor="@color/colorPrimary"
android:textSize="22sp" />
<Button
android:id="@+id/readmorebtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:background="@drawable/readmorebtn"
android:text="Read More"
android:textAllCaps="false"
android:textColor="@color/colorPrimary" />
</LinearLayout>
</ScrollView>