java如何限制NestedScrollView中RecyclerView的高度

Question

在我当前的Android应用程序中，我有一个屏幕显示安卓.support.v4.app.DialogFragment

此DialogFragment视图包含以下UI组件

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

DialogFragment配置为全屏，使用如下样式：-

@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="安卓: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="安卓:windowNoTitle">true</item>
    <item name="安卓:windowFullscreen">true</item>
    <item name="安卓:windowBackground">@安卓:color/white</item>
    <item name="安卓:windowIsFloating">true</item>
    <item name="安卓: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

我希望限制height的RecyclerView

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:安卓="http://schemas.安卓.com/apk/res/安卓"
    xmlns:app="http://schemas.安卓.com/apk/res-auto"
    xmlns:tools="http://schemas.安卓.com/tools"
    安卓:layout_width="match_parent"
    安卓:layout_height="wrap_content"
    安卓:orientation="vertical">

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

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

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

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

            <TextView
                安卓:id="@+id/sub_headline_literal"
                安卓:layout_width="match_parent"
                安卓:layout_height="wrap_content"
                安卓:gravity="center"
                安卓:padding="10dp"
                安卓: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."
                安卓:textSize="16sp"
                安卓:textStyle="normal" />

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

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

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

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

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

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

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

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

                <TextView
                    安卓:id="@+id/submit_button"
                    安卓:layout_width="0dp"
                    安卓:layout_height="wrap_content"
                    安卓:layout_weight="1"
                    安卓:gravity="center"
                    安卓:text="Submit" />
            </LinearLayout>
        </LinearLayout>
    </安卓.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。但是NestedScrollView高度太大，超过一半的高度为空白

我如何限制我的RecyclerView的高度并使NestedScrollView达到wrap_content

我试过NestedScrollView用身高wrap_content但没有效果

如何实现所需的UI？提前谢谢

Answer 1

如果还需要通过定制NestedScrollView来限制NestedScrollView的大小：

public class CustomNestedScrollView extends NestedScrollView {

private int maxHeight;
private final int defaultHeight = 200;

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

public CustomNestedScrollView(Context context, AttributeSet attrs) {
    super(context, attrs);
    if (!isInEditMode()) {
        init(context, attrs);
    }
}

public CustomNestedScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    if (!isInEditMode()) {
        init(context, attrs);
    }
}

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public CustomNestedScrollView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
    if (!isInEditMode()) {
        init(context, attrs);
    }
}

private void init(Context context, AttributeSet attrs) {
    if (attrs != null) {
        TypedArray styledAttrs = context.obtainStyledAttributes(attrs, R.styleable.CustomNestedScrollView);
        //200 is a defualt value
        maxHeight = styledAttrs.getDimensionPixelSize(R.styleable.CustomNestedScrollView_maxHeight, defaultHeight);

        styledAttrs.recycle();
    }
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    heightMeasureSpec = MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.AT_MOST);
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}

attr。xml

<declare-styleable name="CustomNestedScrollView">
        <attr name="maxHeight" format="dimension" />
    </declare-styleable>

自定义嵌套滚动视图的布局示例：

               <your.package.CustomNestedScrollView 
                android:layout_weight="1"
                app:maxHeight="90dp"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content">

                <! Child view with RecyclerView here >


                </your.package.CustomNestedScrollView>

与此定制的NestedScrollView一起，如果您应用RecyclerView的定制，那么它将完全按照您想要的方式工作。我希望这有帮助

Answer 2

我建议在RecyclerView中添加一个页眉和页脚，而不是一个NestedRecyclerView，这将很好地将整个内容放置在我所看到的布局中。我想给你提供一个到my answer here的链接，在那里你可以找到如何在^{中添加页脚和页眉

因此，我建议创建一个带有headline_literal和divider的视图，并将其用作页眉，而RadioGroup、EditText和Button将位于页脚。如果你有任何问题，请告诉我

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

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
        }
    }
}

现在让我们逐一定义布局。这里是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>

而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应该有以下内容

<?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，您已经将原始布局的组件划分为多个部分。因此，主布局应该如下所示

<?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: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，我将分享一个示例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);
    }
}

希望有帮助

Answer 3

自定义回收器视图以设置maxHeight

public class MaxHeightRecyclerView extends RecyclerView {
    private int mMaxHeight;

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

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

    public MaxHeightRecyclerView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initialize(context, attrs);
    }

    private void initialize(Context context, AttributeSet attrs) {
        TypedArray arr = context.obtainStyledAttributes(attrs, R.styleable.MaxHeightScrollView);
        mMaxHeight = arr.getLayoutDimension(R.styleable.MaxHeightScrollView_maxHeight, mMaxHeight);
        arr.recycle();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (mMaxHeight > 0) {
            heightMeasureSpec = MeasureSpec.makeMeasureSpec(mMaxHeight, MeasureSpec.AT_MOST);
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}

n attrs。xml

<declare-styleable name="MaxHeightScrollView">
        <attr name="maxHeight" format="dimension" />
    </declare-styleable>

在xml中设置RecyclerView heightwrap_content，在dp中设置maxHeight为fixwidth。 RecyclerView将使用height wrap_内容，直到您设置的fixWidth，在达到maxHeight后，RecyclerView将可滚动