如何将图像视图放在可绘制的底部

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- 其他视图 -->

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/your_image"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"/>
</RelativeLayout>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- 其他视图 -->

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/your_image"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- 其他视图 -->

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/your_image"
        android:layout_gravity="bottom|center_horizontal"/>
</FrameLayout>

public class CustomDrawable extends Drawable {
    private Bitmap mBitmap;

    public CustomDrawable(Bitmap bitmap) {
        mBitmap = bitmap;
    }

    @Override
    public void draw(Canvas canvas) {
        // 绘制其他内容
        // ...

        // 绘制图像视图到底部
        int bottom = getBounds().bottom;
        int left = (getBounds().width() - mBitmap.getWidth()) / 2;
        canvas.drawBitmap(mBitmap, left, bottom - mBitmap.getHeight(), null);
    }

    @Override
    public void setAlpha(int alpha) {
        // 设置透明度
    }

    @Override
    public void setColorFilter(ColorFilter colorFilter) {
        // 设置颜色过滤器
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }
}

<View
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/custom_drawable"/>