java - 如何限制 NestedScrollView 内 RecyclerView 的高度

Question

在我当前的 Android 应用程序中，我有一个显示 android.support.v4.app.DialogFragment 的屏幕。

此 DialogFragment View 包含以下 UI 组件

HEADING
== Sub Heading
== NestedScrollView
==== RecyclerView
==== RadioGroup
==== Spinner
==== EditText
==== Action Buttons

DialogFragment 使用样式配置为全屏，如下所示:-

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setStyle(DialogFragment.STYLE_NO_TITLE, R.style.AppDialogTheme);
}

我的对话风格是

<!-- Define your custom dialog theme here extending from base -->
<style name="AppDialogTheme" parent="Theme.AppCompat.Light.Dialog">
    <!-- Define color properties as desired -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">#000</item>
    <item name="android:textColorHighlight">@color/background_url</item>
    <item name="colorAccent">@color/dark_grey</item>
    <item name="colorControlNormal">@color/colorPrimaryDark</item>
    <!-- Define window properties as desired -->
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowFullscreen">true</item>
    <item name="android:windowBackground">@android:color/white</item>
    <item name="android:windowIsFloating">true</item>
    <item name="android:windowCloseOnTouchOutside">false</item>
</style>

我使用 NestedScrollView 的原因是 View 可以在纵向和横向模式下工作。

我想限制 RecyclerView 的高度

我得到的最接近的是使用下面的布局。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/headline_literal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:gravity="center"
        android:padding="10dp"
        android:text="Heading"
        android:textSize="20sp"
        android:textStyle="bold" />

    <View
        android:id="@+id/divider"
        android:layout_width="fill_parent"
        android:layout_height="2dp"
        android:layout_marginTop="5dp"
        android:background="#c0c0c0" />

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        tools:context=".MainActivity">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:weightSum="5"
            android:orientation="vertical">

            <TextView
                android:id="@+id/sub_headline_literal"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center"
                android:padding="10dp"
                android:text="Some long texts having a long size so that it takes multiple lines in the view to replicate the real-life app use case. This is important to have 3-4 lines this textview so that we can see if the views are being populated correctly. Hope this sentence is long enough to replicate the real-life scenario of this TextView content. Thank you."
                android:textSize="16sp"
                android:textStyle="normal" />

            <android.support.v7.widget.RecyclerView
                android:id="@+id/dummy_rv"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_margin="10dp"
                android:layout_marginStart="9dp"
                android:layout_marginEnd="9dp"
                android:layout_weight="1"
                android:background="@drawable/rv_border"
                android:fadingEdge="horizontal"
                android:fadingEdgeLength="10dp"
                android:padding="10dp"
                android:requiresFadingEdge="vertical" />

            <RadioGroup
                android:id="@+id/myRadioGroup"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:layout_marginTop="10dp"
                android:checkedButton="@+id/sound">

                <RadioButton
                    android:id="@+id/sound"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Sound" />

                <RadioButton
                    android:id="@+id/vibration"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Vibration" />

                <RadioButton
                    android:id="@+id/silent"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Silent" />
            </RadioGroup>

            <EditText
                android:id="@+id/notes"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Notes" />

            <LinearLayout
                android:id="@+id/buttons"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:padding="10dp">

                <TextView
                    android:id="@+id/cancel_button"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="center"
                    android:text="Cancel" />

                <TextView
                    android:id="@+id/submit_button"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="center"
                    android:text="Submit" />
            </LinearLayout>
        </LinearLayout>
    </android.support.v4.widget.NestedScrollView>
</LinearLayout>

通过在 NestedScrollView 的内部 LinearLayout 上使用 weightSum，我可以限制 Recyclerview 的高度。然而，NestedScrollView 高度太大，一半以上的高度是空白的。

如何限制 RecyclerView 的高度并将 NestedScrollView 设置为 wrap_content？

我试过 NestedScrollView 的高度 wrap_content 但这没有效果。

如何实现所需的用户界面？提前致谢!

Answer 1

我建议不要使用 NestedRecyclerView，而是将页眉和页脚添加到您的 RecyclerView 中，这样可以很好地放置整体内容看过你的布局。我想为您提供一个链接 my answer here您可以在其中找到如何在 RecyclerView 中添加页脚和页眉。

因此，我想建议使用 headline_literal 和 divider 创建一个 View ，并将其用作标题，而 RadioGroup， EditText 和 Button 将位于页脚中。如果您遇到任何问题，请告诉我。

我已经尝试自己实现您想要的行为，请告诉我以下实现是否适合您。我在 Github 中添加了这个以及。

让我们首先声明一个适配器，用于向 RecyclerView 添加页眉和页脚。

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import java.util.ArrayList;

public class RecyclerViewWithHeaderFooterAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private static final int FOOTER_VIEW = 1;
    private static final int HEADER_VIEW = 2;
    private ArrayList<String> data; // Take any list that matches your requirement.
    private Context context;

    // Define a constructor
    public RecyclerViewWithHeaderFooterAdapter(Context context, ArrayList<String> data) {
        this.context = context;
        this.data = data;
    }

    // Define a ViewHolder for Header view
    public class HeaderViewHolder extends ViewHolder {
        public HeaderViewHolder(View itemView) {
            super(itemView);
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // Do whatever you want on clicking the item
                }
            });
        }
    }

    // Define a ViewHolder for Footer view
    public class FooterViewHolder extends ViewHolder {
        public FooterViewHolder(View itemView) {
            super(itemView);
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // Do whatever you want on clicking the item
                }
            });
        }
    }

    // Now define the ViewHolder for Normal list item
    public class NormalViewHolder extends ViewHolder {
        public NormalViewHolder(View itemView) {
            super(itemView);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // Do whatever you want on clicking the normal items
                }
            });
        }
    }

    // And now in onCreateViewHolder, you have to pass the correct view
    // while populating the list item.

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View v;

        if (viewType == FOOTER_VIEW) {
            v = LayoutInflater.from(context).inflate(R.layout.list_item_footer, parent, false);
            FooterViewHolder vh = new FooterViewHolder(v);
            return vh;
        } else if (viewType == HEADER_VIEW) {
            v = LayoutInflater.from(context).inflate(R.layout.list_item_header, parent, false);
            HeaderViewHolder vh = new HeaderViewHolder(v);
            return vh;
        }

        // Otherwise populate normal views
        v = LayoutInflater.from(context).inflate(R.layout.list_item_normal, parent, false);
        NormalViewHolder vh = new NormalViewHolder(v);

        return vh;
    }

    // Now bind the ViewHolder in onBindViewHolder
    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

        try {
            if (holder instanceof NormalViewHolder) {
                NormalViewHolder vh = (NormalViewHolder) holder;

                vh.bindView(position);
            } else if (holder instanceof FooterViewHolder) {
                FooterViewHolder vh = (FooterViewHolder) holder;
            } else if (holder instanceof HeaderViewHolder) {
                HeaderViewHolder vh = (HeaderViewHolder) holder;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // Now the critical part. You have return the exact item count of your list
    // I've only one footer. So I returned data.size() + 1
    // If you've multiple headers and footers, you've to return total count
    // like, headers.size() + data.size() + footers.size()

    @Override
    public int getItemCount() {
        if (data == null) {
            return 0;
        }

        if (data.size() == 0) {
            // Return 1 here to show nothing
            return 1;
        }

        // Add extra view to show the header view
        // Add another extra view to show the footer view
        // So there are two extra views need to be populated
        return data.size() + 2;
    }

    // Now define getItemViewType of your own.
    @Override
    public int getItemViewType(int position) {
        if (position == 0) {
            // This is where we'll add the header.
            return HEADER_VIEW;
        } else if (position == data.size() + 1) {
            // This is where we'll add a footer.
            return FOOTER_VIEW;
        }

        return super.getItemViewType(position);
    }

    // So you're done with adding a footer and its action on onClick.
    // Now set the default ViewHolder for NormalViewHolder
    public class ViewHolder extends RecyclerView.ViewHolder {
        // Define elements of a row here
        public ViewHolder(View itemView) {
            super(itemView);
            // Find view by ID and initialize here
        }

        public void bindView(int position) {
            // bindView() method to implement actions
        }
    }
}

现在让我们一一定义布局。这是 list_item_normal.xml。

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

    <TextView
        android:id="@+id/normal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:text="This is a text to be displayed in each item in the RecyclerView"
        android:textSize="16sp"
        android:textStyle="normal" />

</LinearLayout>

list_item_footer.xml 应该如下所示。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="16dp"
    android:orientation="vertical">

    <RadioGroup
        android:id="@+id/myRadioGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="10dp"
        android:checkedButton="@+id/sound">

        <RadioButton
            android:id="@+id/sound"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Sound" />

        <RadioButton
            android:id="@+id/vibration"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Vibration" />

        <RadioButton
            android:id="@+id/silent"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Silent" />

    </RadioGroup>

    <EditText
        android:id="@+id/notes"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Notes" />

    <LinearLayout
        android:id="@+id/buttons"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:padding="10dp">

        <TextView
            android:id="@+id/cancel_button"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="Cancel" />

        <TextView
            android:id="@+id/submit_button"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:text="Submit" />
    </LinearLayout>
</LinearLayout>

最后，list_item_header.xml 应具有以下内容。

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

    <TextView
        android:id="@+id/sub_headline_literal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="10dp"
        android:text="Some long texts having a long size so that it takes multiple lines in the view to replicate the real-life app use case. This is important to have 3-4 lines this textview so that we can see if the views are being populated correctly. Hope this sentence is long enough to replicate the real-life scenario of this TextView content. Thank you."
        android:textSize="16sp"
        android:textStyle="normal" />

</LinearLayout>

现在您已将原始布局的组件分成几部分。因此，主要布局应如下所示。

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

    <TextView
        android:id="@+id/headline_literal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:gravity="center"
        android:padding="10dp"
        android:text="Heading"
        android:textSize="20sp"
        android:textStyle="bold" />

    <View
        android:id="@+id/divider"
        android:layout_width="fill_parent"
        android:layout_height="2dp"
        android:layout_marginTop="5dp"
        android:background="#c0c0c0" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/dummy_rv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:padding="10dp" />
</LinearLayout>

因此，我分享了一个示例 Activity 来运行这段代码，它将显示整体实现。

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private ArrayList<String> data = new ArrayList<String>();
    private RecyclerViewWithHeaderFooterAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initializeData();
        initializeRecyclerView();
    }

    private void initializeRecyclerView() {
        mRecyclerView = findViewById(R.id.dummy_rv);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        adapter = new RecyclerViewWithHeaderFooterAdapter(this, data);
        mRecyclerView.setAdapter(adapter);
    }

    private void initializeData() {
        for (int i = 0; i < 10; i++) data.add("Position :" + i);
    }
}

希望对您有所帮助!