glide加載自适應圖檔

<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <!--   background     -->

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@mipmap/ic_launcher" />

        <View
            android:layout_width="match_parent"
            android:layout_height="@dimen/dp_10"
            android:layout_marginTop="@dimen/dp_10"
            android:layout_marginBottom="@dimen/dp_10"
            android:background="@color/colorAccent" />

        <!--   src     -->

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:src="@mipmap/ic_launcher" />

        <View
            android:layout_width="match_parent"
            android:layout_height="@dimen/dp_10"
            android:layout_marginTop="@dimen/dp_10"
            android:layout_marginBottom="@dimen/dp_10"
            android:background="@color/colorAccent" />

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:scaleType="fitXY"
            android:src="@mipmap/ic_launcher" />

        <View
            android:layout_width="match_parent"
            android:layout_height="@dimen/dp_10"
            android:layout_marginTop="@dimen/dp_10"
            android:layout_marginBottom="@dimen/dp_10"
            android:background="@color/colorAccent" />

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:adjustViewBounds="true"
            android:scaleType="fitXY"
            android:src="@mipmap/ic_launcher" />

    </LinearLayout>
</androidx.core.widget.NestedScrollView>
           

圖檔寬度滿屏，高度自适應

<ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:adjustViewBounds="true"
    android:scaleType="fitXY"
    tools:src="@tools:sample/avatars" />
           

核心：

android:adjustViewBounds="true"
android:scaleType="fitXY"
           

圖檔寬度滿屏，高度等于寬度

<?xml version="1.0" encoding="utf-8"?>
<MyRelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop"
        tools:src="@tools:sample/avatars" />
</MyRelativeLayout>
           

public class MyRelativeLayout extends RelativeLayout {

    public MyRelativeLayout(Context context, AttributeSet attrs,
                            int defStyle) {
        super(context, attrs, defStyle);
    }

    public MyRelativeLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MyRelativeLayout(Context context) {
        super(context);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        setMeasuredDimension(getDefaultSize(0, widthMeasureSpec),
                getDefaultSize(0, heightMeasureSpec));

        int childWidthSize = getMeasuredWidth();
        // 高度和寬度一樣
        heightMeasureSpec = widthMeasureSpec = MeasureSpec.makeMeasureSpec(
                childWidthSize, MeasureSpec.EXACTLY);
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

}
           

參考：Android RecyclerView 網格顯示正方形元素