我想让任何图像从我的ImageView是圆形的边界。
我搜索了一下，但没有找到任何有用的信息(我尝试的任何方法都不管用)。
如何通过XML实现这一点: 创建一个ImageView与某些src，并使它与边界圆形?
当前回答
试试这个。
public class RoundedImageView extends android.support.v7.widget.AppCompatImageView {
private int borderWidth = 4;
private int viewWidth;
private int viewHeight;
private Bitmap image;
private Paint paint;
private Paint paintBorder;
private BitmapShader shader;
public RoundedImageView(Context context)
{
super(context);
setup();
}
public RoundedImageView(Context context, AttributeSet attrs)
{
super(context, attrs);
setup();
}
public RoundedImageView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
setup();
}
private void setup()
{
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.WHITE);
}
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)
{
loadBitmap();
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;
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)
{
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)
{
result = specSize;
}
else
{
result = viewHeight;
}
return (result + 2);
}
}
然后在布局中使用这个ImageView:
<com.app.Demo.RoundedImageView
android:id="@+id/iv_profileImage"
android:layout_width="70dp"
android:layout_height="70dp"
android:layout_centerHorizontal="true"
/>
其他回答
在glide库和RoundedBitmapDrawableFactory类的帮助下，很容易实现。您可能需要创建圆形占位符映像。
滑翔V4:
Glide.with(context).load(url).apply(RequestOptions.circleCropTransform()).into(imageView);
滑翔V3:
Glide.with(context)
.load(imgUrl)
.asBitmap()
.placeholder(R.drawable.placeholder)
.error(R.drawable.placeholder)
.into(new BitmapImageViewTarget(imgProfilePicture) {
@Override
protected void setResource(Bitmap resource) {
RoundedBitmapDrawable drawable = RoundedBitmapDrawableFactory.create(context.getResources(),
Bitmap.createScaledBitmap(resource, 50, 50, false));
drawable.setCircular(true);
imgProfilePicture.setImageDrawable(drawable);
}
});
对于Picasso RoundedTransformation，这是一个非常好的解决方案，提供了一个额外的选择，在顶部或底部边缘的图像。
这个类是自定义圆形Imageview，有阴影，描边，饱和度，使用这个自定义圆形Imageview，你可以让你的图像在半径的圆形形状。圆形阴影ImageView不需要Github这个类就足够了。
添加CircularImageView到你的布局
CircularImageView c=new CircularImageView(this,screen width,screen height,Bitmap myimage);
yourLayout.addView(c);**
public class CircularImageView extends android.support.v7.widget.AppCompatImageView
{
private final Context context;
private final int width, height;
private final Paint paint;
private final Paint paintBorder,imagePaint;
private final Bitmap bitmap2;
private final Paint paint3;
private Bitmap bitmap;
private BitmapShader shader;
private float radius = 4.0f;
float x = 0.0f;
float y = 8.0f;
private float stroke;
private float strokeWidth = 0.0f;
private Bitmap bitmap3;
private int corner_radius=50;
public CircularImageView(Context context, int width, int height, Bitmap bitmap) {
super(context);
this.context = context;
this.width = width;
this.height = height;
//here "bitmap" is the square shape(width* width) scaled bitmap ..
this.bitmap = bitmap;
paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setAntiAlias(true);
paint.setFilterBitmap(true);
paint.setDither(true);
paint3=new Paint();
paint3.setStyle(Paint.Style.STROKE);
paint3.setColor(Color.WHITE);
paint3.setAntiAlias(true);
paintBorder = new Paint();
imagePaint= new Paint();
paintBorder.setColor(Color.WHITE);
paintBorder.setAntiAlias(true);
this.setLayerType(LAYER_TYPE_SOFTWARE, paintBorder);
this.bitmap2 = Bitmap.createScaledBitmap(bitmap, (bitmap.getWidth() - 40), (bitmap.getHeight() - 40), true);
imagePaint.setAntiAlias(true);
invalidate();
}
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
Shader b;
if (bitmap3 != null)
b = new BitmapShader(bitmap3, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
else
b = new BitmapShader(bitmap2, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
imagePaint.setShader(b);
canvas.drawBitmap(maskedBitmap(), 20, 20, null);
}
private Bitmap maskedBitmap()
{
Bitmap l1 = Bitmap.createBitmap(width,width, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(l1);
paintBorder.setShadowLayer(radius, x, y, Color.parseColor("#454645"));
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
final RectF rect = new RectF();
rect.set(20, 20, bitmap2.getWidth(), bitmap2.getHeight());
canvas.drawRoundRect(rect, corner_radius, corner_radius, paintBorder);
canvas.drawRoundRect(rect, corner_radius, corner_radius, imagePaint);
if (strokeWidth!=0.0f)
{
paint3.setStrokeWidth(strokeWidth);
canvas.drawRoundRect(rect, corner_radius, corner_radius, paint3);
}
paint.setXfermode(null);
return l1;
}
// use seekbar here, here you have to pass "0 -- 250" here corner radius will change
public void setCornerRadius(int corner_radius)
{
this.corner_radius = corner_radius;
invalidate();
}
-------->use seekbar here, here you have to pass "0 -- 10.0f" here shadow radius will change
public void setShadow(float radius)
{
this.radius = radius;
invalidate();
}
// use seekbar here, here you have to pass "0 -- 10.0f" here stroke size will change
public void setStroke(float stroke)
{
this.strokeWidth = stroke;
invalidate();
}
private Bitmap updateSat(Bitmap src, float settingSat)
{
int w = src.getWidth();
int h = src.getHeight();
Bitmap bitmapResult =
Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
Canvas canvasResult = new Canvas(bitmapResult);
Paint paint = new Paint();
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.setSaturation(settingSat);
ColorMatrixColorFilter filter = new ColorMatrixColorFilter(colorMatrix);
paint.setColorFilter(filter);
canvasResult.drawBitmap(src, 0, 0, paint);
return bitmapResult;
}
// use seekbar here, here you have to pass "0 -- 2.0f" here saturation will change
public void setSaturation(float sat)
{
System.out.println("qqqqqqqqqq "+sat);
bitmap3=updateSat(bitmap2, sat);
invalidate();
}
}
// Seekbar to change radius
radius_seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
{
text_radius.setText(""+progress);
circularImageView.setCornerRadius(progress);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
// Seekbar to change shadow
shadow_seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
{
float f= 4+progress/10.0f;
text_shadow.setText(""+progress);
circularImageView.setShadow(f);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
// Seekbar to change saturation
saturation_seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
{
int progressSat = saturation_seekbar.getProgress();
float sat = (float) ((progressSat*4 / 100.0f)-1.0f);
circularImageView.setSaturation(sat);
text_saturation.setText(""+progressSat);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
// Seekbar to change stroke
stroke_seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
{
if (progress==0)
{
float f=(progress*10.0f/100.0f);
circularImageView.setStroke(f);
}
else
{
float f=(progress*10.0f/100.0f);
circularImageView.setStroke(f);
}
text_stroke.setText(""+progress);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
//radius seekbar in xml file
<SeekBar
android:layout_width="match_parent"
android:layout_gravity="center"
android:progress="50"
android:max="250"
android:id="@+id/radius_seekbar"
android:layout_height="wrap_content" />
//saturation seekbar in xml file
<SeekBar
android:layout_width="match_parent"
android:layout_gravity="center"
android:progress="50"
android:max="100"
android:id="@+id/saturation_seekbar"
android:layout_height="wrap_content" />
//shadow seekbar in xml file
<SeekBar
android:layout_width="match_parent"
android:layout_gravity="center"
android:progress="0"
android:max="100"
android:id="@+id/shadow_seekbar"
android:layout_height="wrap_content" />
//stroke seekbar in xml file
<SeekBar
android:layout_width="match_parent"
android:layout_gravity="center"
android:progress="0"
android:max="100"
android:id="@+id/stroke _seekbar"
android:layout_height="wrap_content" />
使用材质组件库只需使用ShapeableImageView。 Somethig:
<com.google.android.material.imageview.ShapeableImageView
app:shapeAppearanceOverlay="@style/roundedImageViewRounded"
app:strokeColor="@color/....."
app:strokeWidth="1dp"
...
/>
:
<style name="roundedImageViewRounded">
<item name="cornerFamily">rounded</item>
<item name="cornerSize">50%</item>
</style>
注意:它至少需要1.2.0版本。
使用jetpack合成，你可以使用CircleShape应用剪辑修饰器:
Image(
painter = painterResource(R.drawable.xxxx),
contentDescription = "xxxx",
contentScale = ContentScale.Crop,
modifier = Modifier
.size(100.dp)
.clip(CircleShape)
.border(2.dp, Color.Blue, CircleShape)
)
我有一个简单的解决办法。 通过右键单击软件包名称并选择new ->Image asset创建一个新的Image asset。 输入名称(任何名称)和路径(映像在系统中的位置)。 然后单击“下一步”和“完成”。 如果您输入图像名称为“img”，则在mipmap文件夹中自动创建一个名称为“img_round”的圆形图像。
然后，这样做:
<ImageView
android:layout_width="100dp"
android:layout_height="100dp"
android:src="@mipmap/img_round"/>
您的预览可能仍然显示一个矩形图像。但如果你在你的设备上运行应用程序，它将是圆形的。
你可以做一个简单的圆，有白色边框，透明内容的形状。
// res/drawable/circle.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:innerRadius="0dp"
android:shape="ring"
android:thicknessRatio="1.9"
android:useLevel="false" >
<solid android:color="@android:color/transparent" />
<stroke
android:width="10dp"
android:color="@android:color/white" />
</shape>
然后制作一个可绘制的图层列表，并将其作为imageview的背景。
// res/drawable/img.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:drawable="@drawable/circle"/>
<item android:drawable="@drawable/ic_launcher"/>
</layer-list>
把它作为imageview的背景。
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/img"/>
你会得到类似的东西。
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