Question

有没有办法在不使用任何外部库的情况下在Android中制作圆形图像视图？ Android设计库中的东西？我应该能够使用代码在运行时设置图像。

Answer 1

您可以将ImageView放入CardView并设置其角半径。简单的例子

<android.support.v7.widget.CardView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        card_view:cardCornerRadius="25dp"
        card_view:cardPreventCornerOverlap="false">

        <ImageView
            android:layout_width="50dp"
            android:layout_height="50dp"/>
    </android.support.v7.widget.CardView>

请注意，圆角半径应比图像尺寸短两倍。

Answer 2

你可以尝试一下它在我的设备中正常工作

像这样创建一个RoundedImageView类

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

public class RoundedImageView extends ImageView
{

    public RoundedImageView(Context ctx, AttributeSet attrs) {
        super(ctx, attrs);
    }

    @Override
    protected void onDraw(Canvas canvas)
    {

        Drawable drawable = getDrawable();

        if (drawable == null)
        {
            return;
        }

        if (getWidth() == 0 || getHeight() == 0)
        {
            return;
        }
        Bitmap b = ((BitmapDrawable) drawable).getBitmap();
        Bitmap bitmap = b.copy(Config.ARGB_8888, true);

        int w = getWidth(), h = getHeight();

        Bitmap roundBitmap = getRoundedCroppedBitmap(bitmap, w);
        canvas.drawBitmap(roundBitmap, 0, 0, null);

    }

    public static Bitmap getRoundedCroppedBitmap(Bitmap bitmap, int radius)
    {
        Bitmap finalBitmap;
        if (bitmap.getWidth() != radius || bitmap.getHeight() != radius)
            finalBitmap = Bitmap.createScaledBitmap(bitmap, radius, radius,
                    false);
        else
            finalBitmap = bitmap;
        Bitmap output = Bitmap.createBitmap(finalBitmap.getWidth(),
                finalBitmap.getHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, finalBitmap.getWidth(),
                finalBitmap.getHeight());

        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
        paint.setDither(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(Color.parseColor("#BAB399"));
        canvas.drawCircle(finalBitmap.getWidth() / 2 + 0.7f,
                finalBitmap.getHeight() / 2 + 0.7f,
                finalBitmap.getWidth() / 2 + 0.1f, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(finalBitmap, rect, rect, paint);

        return output;
    }

}

现在在 layout.xm 中使用以下代码

<com.example.RoundedImageView
    android:layout_width="150dp"
    android:layout_height="150dp"
    app:srcCompat="@drawable/disha" />

Answer 3

要使用具有新的 Android材质组件的圆形ImageView，请使用软件包 onScroll= {Animated.event( [{ nativeEvent: { contentOffset: { y: this. state.scrollY } } }], { useNativeDriver: true, listener: event => { handlerScroll(event); }, }, )} 中的 ShapeableImageView 。< / p>

要应用的属性为 com.google.android.material.imageview.ShapeableImageView

示例：

shapeAppearanceOverlay

样式：

<com.google.android.material.imageview.ShapeableImageView
            android:id="@+id/ivUserPic"
            android:layout_width="@dimen/_75sdp"
            android:layout_height="@dimen/_75sdp"
            android:adjustViewBounds="true"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/labelTitle"
            app:shapeAppearanceOverlay="@style/ShapeAppearance.Image.PILL" />

Answer 4

在应用中使用Material Design的最佳方法

<com.google.android.material.card.MaterialCardView
            android:layout_width="75dp"
            android:layout_height="75dp"
            app:cardCornerRadius="50dp"
            app:strokeWidth="1dp"
            app:strokeColor="@color/black">
            <ImageView
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:id="@+id/paymentlogo"
                android:scaleType="fitCenter"
                android:src="@drawable/your_img" />
        </com.google.android.material.card.MaterialCardView>

Answer 5

    <androidx.cardview.widget.CardView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:cardCornerRadius="50dp"
        android:id="@+id/icon">

        <ImageView
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:background="@drawable/sign_up_1"
            android:id="@+id/icon_val"
            />
    </androidx.cardview.widget.CardView>

如果你使用 androidx 那么看看我的代码，它工作正常

Answer 6

public class CircularImageView extends android.support.v7.widget.AppCompatImageView {

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

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

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

    @Override
    protected void onDraw(Canvas canvas) {

        Drawable drawable = getDrawable();

        if (drawable == null) {
            return;
        }

        if (getWidth() == 0 || getHeight() == 0) {
            return;
        }
        Bitmap b = ((BitmapDrawable) drawable).getBitmap();
        Bitmap bitmap = b.copy(Config.ARGB_8888, true);

        int w = getWidth();
        @SuppressWarnings("unused")
        int h = getHeight();

        Bitmap roundBitmap = getCroppedBitmap(bitmap, w);
        canvas.drawBitmap(roundBitmap, 0, 0, null);

    }

    public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {
        Bitmap sbmp;

        if (bmp.getWidth() != radius || bmp.getHeight() != radius) {
            float smallest = Math.min(bmp.getWidth(), bmp.getHeight());
            float factor = smallest / radius;
            sbmp = Bitmap.createScaledBitmap(bmp,
                    (int) (bmp.getWidth() / factor),
                    (int) (bmp.getHeight() / factor), false);
        } else {
            sbmp = bmp;
        }

        Bitmap output = Bitmap.createBitmap(radius, radius, Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        final String color = "#BAB399";
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, radius, radius);

        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
        paint.setDither(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(Color.parseColor(color));
        canvas.drawCircle(radius / 2 + 0.7f, radius / 2 + 0.7f,
                radius / 2 + 0.1f, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(sbmp, rect, rect, paint);

        return output;
    }

}

试试..

Answer 7

public class RoundedImageView extends ImageView {

       public RoundedImageView(Context ctx, AttributeSet attrs) {
              super(ctx, attrs);
       }

       @Override
       protected void onDraw(Canvas canvas) {

              Drawable drawable = getDrawable();

              if (drawable == null) {
                     return;
              }

              if (getWidth() == 0 || getHeight() == 0) {
                     return;
              }
              Bitmap b = ((BitmapDrawable) drawable).getBitmap();
              Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);

              int w = getWidth(), h = getHeight();

              Bitmap roundBitmap = getRoundedCroppedBitmap(bitmap, w);
              canvas.drawBitmap(roundBitmap, 0, 0, null);

       }

       public static Bitmap getRoundedCroppedBitmap(Bitmap bitmap, int radius) {
              Bitmap finalBitmap;
              if (bitmap.getWidth() != radius || bitmap.getHeight() != radius)
                     finalBitmap = Bitmap.createScaledBitmap(bitmap, radius, radius,
                                  false);
              else
                     finalBitmap = bitmap;
              Bitmap output = Bitmap.createBitmap(finalBitmap.getWidth(),
                           finalBitmap.getHeight(), Config.ARGB_8888);
              Canvas canvas = new Canvas(output);

              final Paint paint = new Paint();
              final Rect rect = new Rect(0, 0, finalBitmap.getWidth(),
                           finalBitmap.getHeight());

              paint.setAntiAlias(true);
              paint.setFilterBitmap(true);
              paint.setDither(true);
              canvas.drawARGB(0, 0, 0, 0);
              paint.setColor(Color.parseColor("#BAB399"));
              canvas.drawCircle(finalBitmap.getWidth() / 2 + 0.7f,
                           finalBitmap.getHeight() / 2 + 0.7f,
                           finalBitmap.getWidth() / 2 + 0.1f, paint);
              paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
              canvas.drawBitmap(finalBitmap, rect, rect, paint);

              return output;
       }

}

您可以像这样制作RoundImageView类

Android中的圆形图像视图，不使用任何外部库

7 个答案: