android - Android：使用圆形锚定 FAB 向 BottomAppBar 添加圆角

Question

我想实现与此视图类似的东西，底部导航，左上角和右上圆角半径以及 a 和锚定 FAB

Answer 1

您可以使用标准BottomAppBar：

   <com.google.android.material.bottomappbar.BottomAppBar
        android:layout_margin="xxdp"
        app:fabAlignmentMode="center"
        app:fabCradleRoundedCornerRadius="2dp"
        app:fabCradleVerticalOffset="8dp"
        app:fabCradleMargin="8dp" />

然后更改ShapeAppearanceModel：

    BottomAppBar bottomAppBar = findViewById(R.id.bottomAppBar);
    MaterialShapeDrawable bottomBarBackground = (MaterialShapeDrawable) bottomAppBar.getBackground();
    bottomBarBackground.setShapeAppearanceModel(
            bottomBarBackground.getShapeAppearanceModel()
                    .toBuilder()
                    .setAllCorners(new RoundedCornerTreatment()).setAllCornerSizes(new RelativeCornerSize(0.5f))
                    .build());

只是关于 new 的注释RelativeCornerSize(0.5f)：它在1.2.0-beta01. 之前new RelativeCornerSize(50)