java - 如何让 ImageView 缩放以在宽度允许的范围内尽可能多地填充布局

Question

我想要的是让 ImageView 以相同的比例缩放以填充布局而不被裁剪。由于宽度将首先匹配，实际上，这意味着缩放直到宽度最大化。

我的代码是:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_display);
    ImageView img = findViewById(R.id.displayImg);
    img.setImageBitmap(bmp); // bmp is a public static Bitmap set by another class
    img.setRotation(90);
    img.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
}

我的布局是:

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

   <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/displayImg" />

</android.support.constraint.ConstraintLayout>

根据 Android ImageView ScaleType: A Visual Guide CENTER_INSIDE 应该

Scale the image uniformly (maintain the image’s aspect ratio) so that both dimensions (width and height) of the image will be equal to or less than the corresponding dimension of the view (minus padding).

黑色图像是我现在的样子，我画的是我认为我应该看到的(如您所知，我是现代的米开朗基罗)。

Answer 1

将这两行添加到您的 ImageView:

android:scaleType="fitXY"

android:adjustViewBounds="true"

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

   <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:scaleType="fitXY"
        android:adjustViewBounds="true"
        android:id="@+id/displayImg" />