android - 如何创建自定义形状按钮背景？

Question

我正在尝试为我的按钮(简单)制作自定义背景，但它显示不正确。它只显示以下输出。



创建房间(btn_create_room_bg):

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape
            android:shape="rectangle">
            <corners
                android:bottomLeftRadius="360dp"
                android:topLeftRadius="360dp" />
            <solid android:color="@color/colorAccent" />
        </shape>
    </item>
</layer-list>

加入房间(btn_join_room_bg):

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <corners
                android:bottomRightRadius="360dp"
                android:topRightRadius="360dp" />
            <solid android:color="@color/colorPrimary" />
        </shape>
    </item>
</layer-list>

按钮代码:
这是我的线性布局中的两个按钮代码。

 <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="300dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="300dp"
        android:orientation="horizontal">

        <Button
            android:layout_width="0dp"
            android:layout_height="48dp"
            android:layout_marginEnd="8dp"
            android:layout_weight="5"
            android:background="@drawable/btn_create_room_bg"
            android:fontFamily="@font/open_sans_bold"
            android:text="@string/landing_btn_create_room"
            android:textAllCaps="false"
            android:textColor="@color/colorWhite" />

        <Button
            android:layout_width="0dp"
            android:layout_height="48dp"
            android:layout_marginStart="8dp"
            android:layout_weight="5"
            android:background="@drawable/btn_join_room_bg"
            android:fontFamily="@font/open_sans_bold"
            android:text="@string/landing_btn_join_room"
            android:textAllCaps="false"
            android:textColor="@color/colorWhite" />
    </LinearLayout>

我需要这样的输出。

Answer 1

您可以构建自定义 CornerTreatment 与 MaterialButton .

您可以扩展默认 CutCornerTreatment :

public class FullCutCornerTreatment extends CutCornerTreatment {

    protected static final float ANGLE_LEFT = 180;

    public FullCutCornerTreatment() {
        super();
    }

    @Override
    public void getCornerPath(
            @NonNull ShapePath shapePath, float angle, float interpolation, float radius) {
        shapePath.reset(0, 2*radius * interpolation, ANGLE_LEFT, 180 - angle);
        shapePath.lineTo(
                (float) (Math.sin(Math.toRadians(angle)) * radius * interpolation),
                (float) (Math.sin(Math.toRadians(90 - angle)) * radius * interpolation));
    }
}

然后只需应用 CornerTreatment到 Button :

MaterialButton materialButton = findViewById(R.id....);
FullCutCornerTreatment customCutCornerTreatment = new FullCutCornerTreatment();

materialButton.setShapeAppearanceModel(materialButton.getShapeAppearanceModel().toBuilder()
        //Standard rounded corner with corner radius=50%
        .setTopLeftCorner(CornerFamily.ROUNDED,new RelativeCornerSize(0.5f))
        .setBottomLeftCorner(CornerFamily.ROUNDED,new RelativeCornerSize(0.5f))
        //Square angle
        .setTopRightCorner(CornerFamily.ROUNDED,0)
        //Full cut corner
        .setBottomRightCorner(customCutCornerTreatment)
             .setBottomRightCornerSize(new RelativeCornerSize(0.5f))
        .build());

关于 new RelativeCornerSize(0.5f) 的说明:它在 1.2.0-beta01中改变了.之前是 new RelativeCornerSize(50)) .