如何设置BottomSheetDialogFragment的最大宽度

Question

题

我用BottomSheetDialogFragment我的情态下表,想设置一个最大宽度,以便在平板电脑/大屏幕在BottomSheet不占用屏幕的整个宽度.我该如何解决这个问题？谢谢!

相关代码和资源

fragment_bottomsheet.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    style="@style/BottomSheetStyle">

    <GridLayout
        android:id="@+id/bottom_sheet"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:alignmentMode="alignBounds"
        android:columnOrderPreserved="false"
        android:columnCount="3"
        android:paddingTop="16dp"
        android:paddingBottom="8dp"
        android:paddingRight="8dp"
        android:paddingLeft="8dp"
        app:layout_behavior="android.support.design.widget.BottomSheetBehavior">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:drawableTop="@drawable/image1"
            android:text="Open"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:drawableTop="@drawable/image2"
            android:text="Save"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:drawableTop="@drawable/image3"
            android:text="Send"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:drawableTop="@drawable/image4"
            android:text="Upload"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:drawableTop="@drawable/image5"
            android:text="Share"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:drawableTop="@drawable/iamge6"
            android:text="More"/>

    </GridLayout>

</android.support.design.widget.CoordinatorLayout>

res/values/styles.xml:

<style name="BottomSheetStyle">
    <item name="android:layout_height">match_parent</item>
    <item name="android:layout_width">match_parent</item>
    <item name="android:layout_gravity">center_horizontal</item>
</style>

res/values-w600dp/styles.xml:

<style name="BottomSheetStyle">
    <item name="android:layout_height">match_parent</item>
    <item name="android:layout_width">640dp</item>
    <item name="android:layout_gravity">center_horizontal</item>
</style>

Answer 1

我找到了一个对我有用的解决方案：

@Override
public void onResume() {
    super.onResume();

    // Resize bottom sheet dialog so it doesn't span the entire width past a particular measurement
    WindowManager wm = (WindowManager) getActivity().getSystemService(Context.WINDOW_SERVICE);
    Display display = wm.getDefaultDisplay();
    DisplayMetrics metrics = new DisplayMetrics();
    display.getMetrics(metrics);
    int width = metrics.widthPixels < 1280 ? metrics.widthPixels : 1280;
    int height = -1; // MATCH_PARENT
    getDialog().getWindow().setLayout(width, height);
}

本质上，这允许我BottomSheet根据显示动态指定尺寸。

Answer 2

考虑到设备的像素密度和方向的 OP 答案的变体：

public final class MyBottomSheetDialogFragment extends BottomSheetDialogFragment {
    ...

    private static int dpToPx(int dp) {
        // https://developer.android.com/guide/practices/screens_support.html#dips-pels
        float density = Resources.getSystem().getDisplayMetrics().density;
        return (int) ((dp * density) + 0.5f);
    }

    @Override
    public void onResume() {
        super.onResume();

        Configuration configuration = getActivity().getResources().getConfiguration();
        if (configuration.orientation == Configuration.ORIENTATION_LANDSCAPE &&
                configuration.screenWidthDp > 450) {
            // you can go more fancy and vary the bottom sheet width depending on the screen width
            // see recommendations on https://material.io/components/sheets-bottom#specs
            getDialog().getWindow().setLayout(ViewUtils.dpToPx(450), -1);
        }
    }
}