如何实现固定高度的 BottomSheetDialogFragment

Question

我需要实施 BottomSheetDialogFragment 并面对这个问题。我需要我的 BottomSheetDialogFragment 有固定的高度。有谁知道如何去做？

这是我的片段内容的 xml

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="@dimen/bottom_sheet_height"
    android:background="@android:color/white"
    android:orientation="vertical">

    <TextView
        android:id="@+id/drag_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="24sp"
        android:textColor="#FF0000"
        android:text="Title"/>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:background="@android:color/white"
        android:layout_weight="1"/>

    <TextView
        android:id="@+id/ok_button"
        android:layout_width="match_parent"
        android:layout_height="54dp"
        android:background="@android:color/holo_blue_dark"
        android:gravity="center"
        android:text="Hello"
        android:textColor="@android:color/white"
        android:textSize="24sp"/>

</LinearLayout>

在 setupDialog() 我这样做：

 @Override
public void setupDialog(Dialog dialog, int style) {
    super.setupDialog(dialog, style);
    View contentView = View.inflate(getContext(), R.layout.bottom_sheet_dialog_content_view, null);
    dialog.setContentView(contentView);
    CoordinatorLayout.LayoutParams layoutParams = ((CoordinatorLayout.LayoutParams) ((View) contentView.getParent()).getLayoutParams());
    CoordinatorLayout.Behavior behavior = layoutParams.getBehavior();
    if (behavior != null && behavior instanceof BottomSheetBehavior) {
        ((BottomSheetBehavior) behavior).setBottomSheetCallback(bottomSheetCallback);
        ((BottomSheetBehavior) behavior).setPeekHeight(getResources().getDimensionPixelSize(R.dimen.bottom_sheet_height));
    }

    initRecyclerView(contentView);
}

行为很常见：

 private BottomSheetBehavior.BottomSheetCallback bottomSheetCallback = new BottomSheetBehavior.BottomSheetCallback() {
    @Override
    public void onStateChanged(@NonNull View bottomSheet, int newState) {
        if (newState == BottomSheetBehavior.STATE_HIDDEN) {
            dismiss();
        }
    }

    @Override
    public void onSlide(@NonNull View bottomSheet, float slideOffset) {
    }
};

---

UPD： 通过将固定高度设置为 RecyclerView 来解决。有谁知道更好的方法？

原文由 Vladislav Sazanovich 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

您可以通过 Creating it 样式直接给出固定高度。

在 styles.xml

 <style name="BottomSheetDialog" parent="Theme.Design.Light.BottomSheetDialog">
    <item name="bottomSheetStyle">@style/bottomSheetStyleWrapper</item>
</style>

<style name="bottomSheetStyleWrapper" parent="Widget.Design.BottomSheet.Modal">
    <item name="behavior_peekHeight">500dp</item>
</style>

更新 ：

 BottomSheetDialog dialog = new BottomSheetDialog(this, R.style.BottomSheetDialog);
dialog.setContentView(R.layout.layout_bottom_sheet);
dialog.show();

或第二种方法：

  CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) ((View) contentView.getParent()).getLayoutParams();
    CoordinatorLayout.Behavior behavior = params.getBehavior();

    if( behavior != null && behavior instanceof BottomSheetBehavior ) {
        ((BottomSheetBehavior) behavior).setBottomSheetCallback(mBottomSheetBehaviorCallback);
        ((BottomSheetBehavior) behavior).setPeekHeight(300);
    }

原文由 Harshad Pansuriya 发布，翻译遵循 CC BY-SA 3.0 许可协议

Answer 2

如果 RecyclerView 内容填充在 initRecyclerView(contentView); 里面，那么显示 BottomSheet 它的高度是众所周知的。要动态设置 BottomSheet 的高度并包装内容，然后在 onResume 函数中添加全局布局侦听器 BottomSheetDialogFragment ：

 @Override
public void onResume() {
    super.onResume();
    addGlobaLayoutListener(getView());
}

private void addGlobaLayoutListener(final View view) {
    view.addOnLayoutChangeListener(new OnLayoutChangeListener() {
        @Override
        public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
            setPeekHeight(v.getMeasuredHeight());
            v.removeOnLayoutChangeListener(this);
        }
    });
}

public void setPeekHeight(int peekHeight) {
    BottomSheetBehavior behavior = getBottomSheetBehaviour();
    if (behavior == null) {
        return;
    }
    behavior.setPeekHeight(peekHeight);
}

private BottomSheetBehavior getBottomSheetBehaviour() {
    CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) ((View) getView().getParent()).getLayoutParams();
    CoordinatorLayout.Behavior behavior = layoutParams.getBehavior();
    if (behavior != null && behavior instanceof BottomSheetBehavior) {
        ((BottomSheetBehavior) behavior).setBottomSheetCallback(mBottomSheetBehaviorCallback);
        return (BottomSheetBehavior) behavior;
    }
    return null;
}

原文由 R. Zagórski 发布，翻译遵循 CC BY-SA 3.0 许可协议