如何設置圖像尺寸的平方。.所有手機屏幕都支持哪一種？

Question

項目布局

    <android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/top_panel"
        android:background="@drawable/transback"
        app:cardCornerRadius="10dp"
        android:layout_marginBottom="1dp"
        android:layout_marginLeft="1dp"
        android:layout_marginRight="1dp">

    <ImageView
        android:id="@+id/categoryImage"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="fitXY" />

    </android.support.v7.widget.CardView>

我想將圖像尺寸設置為正方形，例如屏幕寬度=圖像高度

這是我用於回收者視圖的項目

怎么可能..？

Answer 1

您可以自定義ImageView來創建SquareImageView

public class SquareImageView  extends ImageView {

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

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

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


  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    int width = getMeasuredWidth();
    setMeasuredDimension(width, width);
  }

}

Answer 2

使用約束布局 應用程序：layout_constraintDimensionRatio =“ 1：1”

1. 閱讀文件
2. 看例子

Answer 3

您可以將圖像寬高比設置為1：1，以實現方形圖像，如下所示：

   <ImageView
        android:id="@+id/imageView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintDimensionRatio="1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:src="@tools:sample/avatars[1]" />

如果您希望屏幕對所有屏幕尺寸都做出響應，則可以使用准則，並為它們提供屏幕的某些百分比，如下所示：

  <androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toTopOf="@+id/guideline4"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/guideline3"
        tools:src="@tools:sample/avatars[1]" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.3" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.6" />



</androidx.constraintlayout.widget.ConstraintLayout>

Answer 4

在Android Mani Fest上添加這些行

<supports-screens
    android:resizeable="true"
    android:smallScreens="true"
    android:normalScreens="true"
    android:largeScreens="true"
    android:anyDensity="true"
    />

這是我的imageView

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">

<ImageView
    android:layout_width="0dp"
    android:layout_height="0dp"
    app:layout_constraintDimensionRatio="1:1"
    android:scaleType="fitXY"
    android:adjustViewBounds="true"
    android:src="@drawable/image"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintStart_toStartOf="parent"/>

Answer 5

您可以使用此Square Imageview

自定義Imageview：

public class SquareImageView extends ImageView {

    public SquareImageView(final Context context) {
        super(context);
    }

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

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

    @Override
    protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
        final int width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
        setMeasuredDimension(width, width);
    }

    @Override
    protected void onSizeChanged(final int w, final int h, final int oldw, final int oldh) {
        super.onSizeChanged(w, w, oldw, oldh);
    }
}

XML

 <yourpackagename.SquareImageView
                android:id="@+id/item_iv"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="centerCrop" />