如何在圆形imageView android上添加阴影和边框? [英] How to add a shadow and a border on circular imageView android?
问题描述
我用这个问题创建了一个 CircularImageView: 使用 gradle 依赖项所有修复:
编译'com.mikhaellopez:circularimageview:2.0.1'
我修改了 CircularImageView found here实现你想要的.
为了在边框周围创建阴影,我简单地使用了这两行:
this.setLayerType(LAYER_TYPE_SOFTWARE,paintBorder);PaintBorder.setShadowLayer(4.0f, 0.0f, 2.0f, Color.BLACK);
由于 HoneyComb 及更高版本的硬件加速,您需要 setLayerType
.当我尝试它时,没有它就行不通.
完整代码如下:
import android.annotation.SuppressLint;导入 android.content.Context;导入 android.graphics.Bitmap;导入 android.graphics.BitmapShader;导入 android.graphics.Canvas;导入 android.graphics.Color;导入 android.graphics.Paint;导入 android.graphics.Shader;导入 android.graphics.drawable.BitmapDrawable;导入 android.util.AttributeSet;导入 android.widget.ImageView;公共类 CircularImageView 扩展 ImageView{私人 int borderWidth = 4;私人 int viewWidth;私人 int viewHeight;私人位图图像;私人油漆涂料;私人油漆paintBorder;私有位图着色器;公共 CircularImageView(上下文上下文){超级(上下文);设置();}public CircularImageView(上下文上下文,AttributeSet attrs){超级(上下文,属性);设置();}public CircularImageView(上下文上下文,AttributeSet attrs,int defStyle){超级(上下文,属性,defStyle);设置();}私人无效设置(){//初始化绘制油漆 = 新油漆();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){如果(paintBorder != null)PaintBorder.setColor(borderColor);this.invalidate();}私有无效 loadBitmap(){BitmapDrawable bitmapDrawable = (BitmapDrawable) this.getDrawable();if (bitmapDrawable != null)图像 = bitmapDrawable.getBitmap();}@SuppressLint("DrawAllocation")@覆盖公共无效 onDraw(画布画布){//加载位图加载位图();//初始化着色器如果(图像!= null){shader = new BitmapShader(Bitmap.createScaledBitmap(image, canvas.getWidth(), canvas.getHeight(), false), Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);Paint.setShader(着色器);int circleCenter = viewWidth/2;//circleCenter 是视图中心的 x 或 y//半径是要绘制的圆的半径(以像素为单位)//油漆包含将纹理形状的着色器canvas.drawCircle(circleCenter + borderWidth, circleCenter + borderWidth, circleCenter + borderWidth - 4.0f,paintBorder);canvas.drawCircle(circleCenter + borderWidth, circleCenter + borderWidth, circleCenter - 4.0f, 油漆);}}@覆盖protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){int width = measureWidth(widthMeasureSpec);int height = measureHeight(heightMeasureSpec, widthMeasureSpec);viewWidth = 宽度 - (borderWidth * 2);视图高度 = 高度 - (borderWidth * 2);setMeasuredDimension(宽度,高度);}私有 int measureWidth(int measureSpec){整数结果 = 0;int specMode = MeasureSpec.getMode(measureSpec);int specSize = MeasureSpec.getSize(measureSpec);如果(specMode == MeasureSpec.EXACTLY){//我们被告知有多大结果 = 规格尺寸;}别的{//测量文本结果 = 视图宽度;}返回结果;}私有 int measureHeight(int measureSpecHeight, int measureSpecWidth){整数结果 = 0;int specMode = MeasureSpec.getMode(measureSpecHeight);int specSize = MeasureSpec.getSize(measureSpecHeight);如果(specMode == MeasureSpec.EXACTLY){//我们被告知有多大结果 = 规格尺寸;}别的{//测量文本(注意:上升是一个负数)结果 = 视图高度;}返回(结果 + 2);}}
希望能帮到你!
.
编辑
我分叉了您的 CircularImageView 并添加了对选择器叠加的支持.我还显着提高了绘图性能...
https://github.com/Pkmmte/CircularImageView
I created a CircularImageView with this question: Create circular image view in android
Download project on GitHub
1) This is the CircularImageView class :
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) I use in my layout like this :
<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) Current result in picture :
How do I change this code to have a shadow and a circular border around my imageView?
Objectif result :
Edit 10/15/2015 :
You can used or download my GitHub library CircularImageView with all the fixes by using gradle dependency :
compile 'com.mikhaellopez:circularimageview:2.0.1'
I modified the CircularImageView found here to achieve what you want.
To create a shadow around the border, I simply used these two lines:
this.setLayerType(LAYER_TYPE_SOFTWARE, paintBorder);
paintBorder.setShadowLayer(4.0f, 0.0f, 2.0f, Color.BLACK);
You need setLayerType
due to hardware acceleration on HoneyComb and up. It didn't work without it when I tried it.
Here is the full code:
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);
}
}
I hope it helps!
.
EDIT
I forked your CircularImageView and added support for selector overlays. I also improved drawing performance significantly...
https://github.com/Pkmmte/CircularImageView
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