无法在对话框片段中滚动 [英] Can't Scroll in Dialog Fragment

问题描述

我试图让 DialogFragment 弹出并显示可滚动的 TextView 图例，但它只是切断了图例的其余部分.我无法滚动浏览它或任何东西.我尝试添加一个 ScrollView 但它没有做任何事情.这是我得到的屏幕:

I am trying to get a DialogFragment to popup and to show a scrollable TextView legend but it just cuts off the rest of the legend. I can't scroll through it or anything. I tried adding a ScrollView but it doesn't do anything. This is the screen that I get:

这是我的 XML 布局文件:

This is my XML layout file:

<?xml version="1.0" encoding="utf-8"?>

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="true">

    <LinearLayout android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:scrollbars="vertical"
        android:scrollbarAlwaysDrawVerticalTrack="true"
        android:background="#fff">

        <TextView
            android:id="@+id/layer_legend_title_textview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:background="#fff"
            android:textColor="#000" />

        <ListView
            android:id="@+id/layer_legend_symbols_listview"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:background="#fff"
            android:textColor="#000" />

    </LinearLayout>

</ScrollView>

我运行它来向 TextView 添加内容:

I run this to add content to the TextView:

/**
 * A dialog that shows the legend of a ArcGISDynamicMapServiceLayer.
 */
public class LegendDialogFragment extends DialogFragment implements View.OnClickListener {

    public static final String TAG = LegendDialogFragment.class.getSimpleName();
    private LinearLayout mLinearLayout;
    private ArcGISDynamicMapServiceLayer mLayer;
    private ImageButton backButton;

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        mLinearLayout = (LinearLayout) inflater.inflate(R.layout.legend_dialog_fragment_layout, null);
        getDialog().setTitle(getActivity().getString(R.string.legend));

        mLayer = ((MainActivity) getActivity()).getLayer();

        backButton = (ImageButton) mLinearLayout.findViewById(R.id.backButton2);
        backButton.setOnClickListener(this);
        // before we can show the legend we have to fetch the legend info asynchronously
        new FetchLegendTask().execute();

        return mLinearLayout;
    }

    public void onAttach(Activity activity) {
        super.onAttach(activity);

        if (!(activity instanceof MainActivity)) {
            throw new IllegalStateException("Hosting activity needs to be of type MainActivity");
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.backButton2:
                getDialog().dismiss();
                break;
        }
    }

    /**
     * Retrieves the legend information asynchronously from the ArcGISDynamicMapServiceLayer.
     */
    private class FetchLegendTask extends AsyncTask<Void, Void, Void> {

        @Override
        protected Void doInBackground(Void... params) {
            mLayer.retrieveLegendInfo();
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);

            for (ArcGISLayerInfo layerInfo : mLayer.getAllLayers()) {
                if(layerInfo.isVisible()){
                    View view = getActivity().getLayoutInflater().inflate(R.layout.layer_legend_layout, null);
                    populateLegendView(view, layerInfo);

                    mLinearLayout.addView(view);
                }
            }
        }

        private View populateLegendView(View view, ArcGISLayerInfo layerInfo) {
            if (layerInfo != null) {
                TextView textView = (TextView) view.findViewById(R.id.layer_legend_title_textview);

                textView.setText(layerInfo.getName());
            }
            return view;
        }
    }

}

我希望整个 Fragment 都是可滚动的，但不知道如何实现.每当我尝试包含 ScrollView 时，它只会滚动该特定一行的其余部分.它不会显示所有内容.我认为它与 DialogFragment 有更多关系.

I want the entire Fragment to be scrollable but don't know how to achieve this. Whenever I try to include a ScrollView, it only scrolls the rest of that specific one line . It won't show all the content. I'm thinking it has more to do with the DialogFragment.

好的，所以我想我知道为什么它不会滚动.它在循环中一遍又一遍地调用 View.然后填充图层，最后将TextView 添加到LinearLayout.所以它不一定被附加".所以添加一个 ScrollView 只会使最后一部分可滚动.如果有人知道如何解决这个问题，请告诉我.

Ok, so I think I know why it won't scroll. It calls the View over and over again in the loop. Then it populates the layer, and finally adds the TextView to the LinearLayout. So it is not necessarily being "appended". So adding a ScrollView will only make the last part scrollable. If anyone knows how to fix this, please let me know.

我从这里得到了这个例子的链接:

I got the link for the example from here:

MapLegend

推荐答案

我想出了如何使整个视图可滚动.ScrollView 不工作的原因是因为这个声明:

I figured out how to make the entire view scrollable. The reason the ScrollView was not working was because of this statement:

mLinearLayout = (LinearLayout) inflater.inflate(R.layout.legend_dialog_fragment_layout, null);

它采用该 xml 的整个布局并使其成为一个视图.然后它遍历视图并一遍又一遍地创建新视图.因此，如果您将视图包装在可滚动对象中，它会将可滚动事件附加到该特定视图.

It takes the entire layout of that xml and makes it one view. It then loops through the view and creates new views over and over again. So if you wrap the view in a scrollable, it appends the scrollable event to that specific view.

我所做的是打电话

View view = inflater.inflate(R.layout.legend_dialog_fragment_layout, container, false);
mLinearLayout = (LinearLayout) view.findViewById(R.id.legend_dialog_fragment_linearlayout);

那样，它使用该 xml 的线性布局，而不是整个 xml 布局.

That way, it uses the linearLayout of that xml as opposed to the entire xml layout.

然后我遇到了另一个问题，因为 ScrollView，列表每次都被压缩成一行.所以我所做的是:

I then ran into another issue with the list being compressed into one line each time because of the ScrollView. So what I did was:

     /**** Method for Setting the Height of the ListView dynamically.
     **** Hack to fix the issue of not showing all the items of the ListView
     **** when placed inside a ScrollView  ****/
    public void setListViewHeightBasedOnChildren(ListView listView) {
        ListAdapter listAdapter = listView.getAdapter();
        if (listAdapter == null)
            return;

        int desiredWidth = View.MeasureSpec.makeMeasureSpec(listView.getWidth(), View.MeasureSpec.UNSPECIFIED);
        int totalHeight = 0;
        View view = null;
        for (int i = 0; i < listAdapter.getCount(); i++) {
            view = listAdapter.getView(i, view, listView);
            if (i == 0)
                view.setLayoutParams(new ViewGroup.LayoutParams(desiredWidth, GridLayout.LayoutParams.WRAP_CONTENT));

            view.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);
            totalHeight += view.getMeasuredHeight();
        }
        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
        listView.setLayoutParams(params);
    }

在一个视图中显示包含内容的列表.

which shows the list with the contents in it in one view.

顺便说一下，我从这个 Arshu 那里得到了代码，他有一个惊人的解决方案.这是链接:

By the way, I got the code from this Arshu who had an amazing solution. Here is the link:

答案

如果我的回答看起来令人困惑，我很抱歉.我对 stackoverflow 和 android 环境还很陌生.

I'm sorry if my answer seems confusing. I'm fairly new with stackoverflow and the android enviornment.

这篇关于无法在对话框片段中滚动的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！