Imageview不显示圆角

Question

我正在尝试使布局像这样，但是我无法使这样的imageview带有圆角。它在Android Studio的布局编辑器中完美显示，但是在实际设备中，我的工作变得很平淡。我通过XML和代码感到疲倦，但没有一个对我有用。请帮助我使布局像此示例图像一样。

我的布局文件

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout 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_height="match_parent"
    android:layout_width="match_parent"
    android:clickable="true"
    android:background="?android:attr/colorBackground"
    android:focusable="true">

    <androidx.constraintlayout.widget.ConstraintLayout

        android:layout_width="match_parent"
        android:layout_height="170dp"
        android:paddingBottom="10dp"
        android:paddingTop="10dp"
        android:paddingLeft="5dp"
        android:paddingRight="5dp"
        android:paddingStart="5dp"
        android:paddingEnd="5dp"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true">

        <ProgressBar

            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/User_CoverPhoto"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            />

        <ImageView

            android:layout_width="150dp"
            android:layout_height="match_parent"
            android:layout_marginEnd="8dp"
            android:background="@drawable/round_shape_only"
            android:scaleType="centerCrop"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/User_CoverPhoto"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />


        <ProgressBar

            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/User_ProfilePictures"
            app:layout_constraintTop_toTopOf="parent"
            />
        <ImageView

            android:layout_width="230dp"
            android:layout_height="match_parent"
            android:background="@drawable/round_shape_only"
            android:scaleType="centerCrop"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/User_ProfilePictures"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="16dp"
            android:background="#40000000"
            android:backgroundTint="#CC000000"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:text="Profile Picture"
            android:textColor="@color/white"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="@+id/User_ProfilePictures"
            app:layout_constraintHorizontal_bias="0.01"
            app:layout_constraintStart_toStartOf="@+id/User_ProfilePictures" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="16dp"
            android:background="#40000000"
            android:backgroundTint="#CC000000"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:text="Cover Photo"
            android:textColor="@color/white"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="@+id/User_CoverPhoto" />

    </androidx.constraintlayout.widget.ConstraintLayout>


    <androidx.recyclerview.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"

        android:clipToPadding="false"
        android:paddingTop="13dp"

        android:id="@+id/Grid_Recycler">

    </androidx.recyclerview.widget.RecyclerView>



</RelativeLayout>

圆形XML

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#CCCCCC"/>
    <padding android:left="1dp"
        android:top="1dp"
        android:right="1dp"
        android:bottom="1dp"/>


    <corners android:radius="15dp"/>
</shape>

Answer 1

对于圆角，您可以使用以下自定义布局：

Java：RoundedCornerImageLayout.java

public class RoundedCornerImageLayout extends FrameLayout {
    private final static float CORNER_RADIUS = 10.0f;
    private float cornerRadius;

    public RoundedCornerImageLayout(Context context) {
        super(context);
        init(context, null, 0);
    }

    public RoundedCornerImageLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs, 0);
    }

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

    private void init(Context context, AttributeSet attrs, int defStyle) {
        DisplayMetrics metrics = context.getResources().getDisplayMetrics();
        cornerRadius = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, CORNER_RADIUS, metrics);
        setLayerType(View.LAYER_TYPE_SOFTWARE, null);
    }


    @Override
    protected void dispatchDraw(Canvas canvas) {
        int count = canvas.save();

        final Path path = new Path();
        path.addRoundRect(new RectF(0, 0, canvas.getWidth(), canvas.getHeight()), cornerRadius, cornerRadius, Path.Direction.CW);
        canvas.clipPath(path, Region.Op.INTERSECT);

        canvas.clipPath(path);
        super.dispatchDraw(canvas);
        canvas.restoreToCount(count);
    }
}

您可以根据需要更改private final static float CORNER_RADIUS = 10.0f;

在XMl文件中

<androidx.constraintlayout.widget.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"
    tools:context=".RoundedImageViewActivity">
    <com.example.stackdemo.ui.RoundedCornerImageLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent">
        <ImageView
            android:layout_width="150dp"
            android:layout_height="150dp"
            android:src="@drawable/ocean"
            android:scaleType="centerCrop"/>
    </com.example.stackdemo.ui.RoundedCornerImageLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

以上代码的输出是：

希望对您有帮助

Answer 2

[当将setClipToOutline与true一起使用时，应调用background至radius，它只能以编程方式调用，而不能由XML设置]

imageView.setClipToOutline(true);