问如何在圆形imageView android上添加阴影和边框？
EN

Stack Overflow用户

提问于 2013-07-15 21:21:21

回答 7查看 75.7K关注 0票数 63

我创建了一个带有这个问题的CircularImageView：Create circular image view in android

在上下载项目

1)这是CircularImageView类：

public class CircularImageView extends ImageView {
    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(Bitmap.Config.ARGB_8888, true);      

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

    public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {
        Bitmap sbmp;
        if(bmp.getWidth() != radius || bmp.getHeight() != radius)
            sbmp = Bitmap.createScaledBitmap(bmp, radius, radius, false);
        else
            sbmp = bmp;

        Bitmap output = Bitmap.createBitmap(sbmp.getWidth(), sbmp.getHeight(), Bitmap.Config.ARGB_8888);
        final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight());

        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
        paint.setDither(true);      
        paint.setColor(Color.parseColor("#BAB399"));

        Canvas c = new Canvas(output);        
        c.drawARGB(0, 0, 0, 0);
        c.drawCircle(sbmp.getWidth() / 2+0.7f, sbmp.getHeight() / 2+0.7f, sbmp.getWidth() / 2+0.1f, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        c.drawBitmap(sbmp, rect, rect, paint);

        return output;
    }
}

2)我在布局中使用如下所示：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#cccccc"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="10dp" >

    <com.mikhaellopez.circularimageview.CircularImageView
        android:id="@+id/imageViewCircular"
        android:layout_width="@dimen/image_view_size"
        android:layout_height="@dimen/image_view_size"
        android:layout_gravity="center"
        android:background="@drawable/border"
        android:src="@drawable/image" />

</LinearLayout>

3)图片中的当前结果：

如何将此代码更改为在imageView周围显示阴影和圆形边框？

Objectif结果：

2015年10月15日编辑:

您可以使用或下载我的GitHub库 所有修复，方法是使用gradle dependency：

compile 'com.mikhaellopez:circularimageview:2.0.1'

java

android

imageview

回答 7

Stack Overflow用户

回答已采纳

发布于 2013-10-16 08:55:16

我修改了CircularImageView found here以达到您想要的效果。

要在边框周围创建阴影，我只需使用以下两行：

this.setLayerType(LAYER_TYPE_SOFTWARE, paintBorder);
paintBorder.setShadowLayer(4.0f, 0.0f, 2.0f, Color.BLACK);

由于HoneyComb和更高版本的硬件加速，您需要setLayerType。当我尝试的时候，没有它它就不能工作。

下面是完整的代码：

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.widget.ImageView;

public class CircularImageView extends ImageView
{
    private int borderWidth = 4;
    private int viewWidth;
    private int viewHeight;
    private Bitmap image;
    private Paint paint;
    private Paint paintBorder;
    private BitmapShader shader;

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

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

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

    private void setup()
    {
        // init paint
        paint = new Paint();
        paint.setAntiAlias(true);

        paintBorder = new Paint();
        setBorderColor(Color.WHITE);
        paintBorder.setAntiAlias(true);
        this.setLayerType(LAYER_TYPE_SOFTWARE, paintBorder);
        paintBorder.setShadowLayer(4.0f, 0.0f, 2.0f, Color.BLACK);
    }

    public void setBorderWidth(int borderWidth)
    {
        this.borderWidth = borderWidth;
        this.invalidate();
    }

    public void setBorderColor(int borderColor)
    {
        if (paintBorder != null)
            paintBorder.setColor(borderColor);

        this.invalidate();
    }

    private void loadBitmap()
    {
        BitmapDrawable bitmapDrawable = (BitmapDrawable) this.getDrawable();

        if (bitmapDrawable != null)
            image = bitmapDrawable.getBitmap();
    }

    @SuppressLint("DrawAllocation")
    @Override
    public void onDraw(Canvas canvas)
    {
        // load the bitmap
        loadBitmap();

        // init shader
        if (image != null)
        {
            shader = new BitmapShader(Bitmap.createScaledBitmap(image, canvas.getWidth(), canvas.getHeight(), false), Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
            paint.setShader(shader);
            int circleCenter = viewWidth / 2;

            // circleCenter is the x or y of the view's center
            // radius is the radius in pixels of the cirle to be drawn
            // paint contains the shader that will texture the shape
            canvas.drawCircle(circleCenter + borderWidth, circleCenter + borderWidth, circleCenter + borderWidth - 4.0f, paintBorder);
            canvas.drawCircle(circleCenter + borderWidth, circleCenter + borderWidth, circleCenter - 4.0f, paint);
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        int width = measureWidth(widthMeasureSpec);
        int height = measureHeight(heightMeasureSpec, widthMeasureSpec);

        viewWidth = width - (borderWidth * 2);
        viewHeight = height - (borderWidth * 2);

        setMeasuredDimension(width, height);
    }

    private int measureWidth(int measureSpec)
    {
        int result = 0;
        int specMode = MeasureSpec.getMode(measureSpec);
        int specSize = MeasureSpec.getSize(measureSpec);

        if (specMode == MeasureSpec.EXACTLY)
        {
            // We were told how big to be
            result = specSize;
        }
        else
        {
            // Measure the text
            result = viewWidth;
        }

        return result;
    }

    private int measureHeight(int measureSpecHeight, int measureSpecWidth)
    {
        int result = 0;
        int specMode = MeasureSpec.getMode(measureSpecHeight);
        int specSize = MeasureSpec.getSize(measureSpecHeight);

        if (specMode == MeasureSpec.EXACTLY)
        {
            // We were told how big to be
            result = specSize;
        }
        else
        {
            // Measure the text (beware: ascent is a negative number)
            result = viewHeight;
        }

        return (result + 2);
    }
}

我希望它能有所帮助！

。

编辑

我派生了你的CircularImageView并添加了对选择器覆盖的支持。我还显著提高了绘图性能……

https://github.com/Pkmmte/CircularImageView

票数 74

Stack Overflow用户

发布于 2015-05-20 15:40:02

为了通过将ImageView做成圆形来添加边框，我做了一件简单的事情，我使用这个类把我的图像做成圆形

package com.fidenz.fexceller.fexceller;

/**
 * Created by Chathu Hettiarachchi on 5/18/2015.
 */
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.drawable.Drawable;

public class RoundedImg extends Drawable {
    private final Bitmap mBitmap;
    private final Paint mPaint;
    private final RectF mRectF;
    private final int mBitmapWidth;
    private final int mBitmapHeight;

    public RoundedImg(Bitmap bitmap) {
        mBitmap = bitmap;
        mRectF = new RectF();
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        final BitmapShader shader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
        mPaint.setShader(shader);

        mBitmapWidth = mBitmap.getWidth();
        mBitmapHeight = mBitmap.getHeight();
    }

    @Override
    public void draw(Canvas canvas) {
        canvas.drawOval(mRectF, mPaint);
    }

    @Override
    protected void onBoundsChange(Rect bounds) {
        super.onBoundsChange(bounds);
        mRectF.set(bounds);
    }

    @Override
    public void setAlpha(int alpha) {
        if (mPaint.getAlpha() != alpha) {
            mPaint.setAlpha(alpha);
            invalidateSelf();
        }
    }

    @Override
    public void setColorFilter(ColorFilter cf) {
        mPaint.setColorFilter(cf);
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }

    @Override
    public int getIntrinsicWidth() {
        return mBitmapWidth;
    }

    @Override
    public int getIntrinsicHeight() {
        return mBitmapHeight;
    }

    public void setAntiAlias(boolean aa) {
        mPaint.setAntiAlias(aa);
        invalidateSelf();
    }

    @Override
    public void setFilterBitmap(boolean filter) {
        mPaint.setFilterBitmap(filter);
        invalidateSelf();
    }

    @Override
    public void setDither(boolean dither) {
        mPaint.setDither(dither);
        invalidateSelf();
    }

    public Bitmap getBitmap() {
        return mBitmap;
    }

}

通过在onCreate上使用它，我调用了设置它的图像，

profilePic = (ImageView)findViewById(R.id.img_home_profile_pic);

Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.no_image);
roundedImage = new RoundedImg(bm);
profilePic.setImageDrawable(roundedImage);

为了添加边框，我创建了一个圆形XML，如下所示：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval" >
    <gradient android:startColor="@color/ring_color" android:endColor="@color/ring_color"
        android:angle="270"/>
</shape>

然后使用布局，我添加了一个里面有ImageView的RelativeLayout，通过使用填充和背景可绘制的wrap_content，我这样设置我的RelativeLayout

<RelativeLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/lay_rel_img"
    android:layout_gravity="center"
    android:padding="5dp"
    android:background="@drawable/circle">

    <ImageView
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:layout_gravity="center"
        android:id="@+id/img_home_profile_pic"
        android:src="@drawable/no_image"
        android:layout_centerHorizontal="true"/>

</RelativeLayout>

现在它是这样显示的，我不知道添加阴影，也很抱歉

票数 14

Stack Overflow用户

发布于 2013-09-15 12:41:28

Add canvas.drawCircle(getWidth() / 2, getWidth() / 2, getWidth() / 2, paint); before canvas.drawBitmap(roundBitmap, 0, 0, null);
Change c.drawCircle(sbmp.getWidth() / 2, sbmp.getHeight() / 2, sbmp.getWidth() / 2, paint); to c.drawCircle(sbmp.getWidth() / 2, sbmp.getHeight() / 2, sbmp.getWidth() / 2 - "the border with you prefer", paint);

希望能有所帮助。

也许是一个更好的解决方案here。

票数 3

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/17655264

复制

相似问题

问如何在圆形imageView android上添加阴影和边框？
EN

回答 7

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在圆形imageView android上添加阴影和边框？EN

回答 7

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在圆形imageView android上添加阴影和边框？
EN