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
这是我设计的最简单的方法。试试这个。
依赖关系
implementation 'androidx.appcompat:appcompat:1.3.0-beta01' implementation 'androidx.cardview:cardview:1.0.0' <android.support.v7.widget.CardView android:layout_width="80dp" android:layout_height="80dp" android:elevation="12dp" android:id="@+id/view2" app:cardCornerRadius="40dp" android:layout_centerHorizontal="true" android:innerRadius="0dp" android:shape="ring" android:thicknessRatio="1.9"> <ImageView android:layout_height="80dp" android:layout_width="match_parent" android:id="@+id/imageView1" android:src="@drawable/YOUR_IMAGE" android:layout_alignParentTop="true" android:layout_centerHorizontal="true"> </ImageView> </android.support.v7.widget.CardView> If you are working on android versions above lollipop <android.support.v7.widget.CardView android:layout_width="80dp" android:layout_height="80dp" android:elevation="12dp" android:id="@+id/view2" app:cardCornerRadius="40dp" android:layout_centerHorizontal="true"> <ImageView android:layout_height="80dp" android:layout_width="match_parent" android:id="@+id/imageView1" android:src="@drawable/YOUR_IMAGE" android:scaleType="centerCrop"/> </android.support.v7.widget.CardView>
添加边界圆ImageView -最新版本
用另一个比内部CardView稍大的CardView包装它，并设置它的背景色，为圆形图像添加边框。你可以增加外部CardView的大小来增加边框的厚度。
<androidx.cardview.widget.CardView
android:layout_width="155dp"
android:layout_height="155dp"
app:cardCornerRadius="250dp"
app:cardBackgroundColor="@color/white">
<androidx.cardview.widget.CardView
android:layout_width="150dp"
android:layout_height="150dp"
app:cardCornerRadius="250dp"
android:layout_gravity="center">
<ImageView
android:layout_width="150dp"
android:layout_height="150dp"
android:src="@drawable/default_user"
android:scaleType="centerCrop"/>
</androidx.cardview.widget.CardView>
</androidx.cardview.widget.CardView>
其他回答
创建一个CustomImageview，然后简单地覆盖它的onDraw()方法如下:
@Override
protected void onDraw(Canvas canvas) {
float radius = this.getHeight()/2;
Path path = new Path();
RectF rect = new RectF(0, 0, this.getWidth(), this.getHeight());
path.addRoundRect(rect, radius, radius, Path.Direction.CW);
canvas.clipPath(path);
super.onDraw(canvas);
}
如果你想要的代码自定义小部件以及:-
CircularImageView.java
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Path;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;
import androidx.annotation.Nullable;
public class CircularImageView extends ImageView {
private Drawable image;
public CircularImageView(Context context) {
super(context);
init(null, 0);
}
public CircularImageView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init(attrs, 0);
}
public CircularImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(attrs, defStyleAttr);
}
@Override
protected void onDraw(Canvas canvas) {
float radius = this.getHeight()/2;
Path path = new Path();
RectF rect = new RectF(0, 0, this.getWidth(), this.getHeight());
path.addRoundRect(rect, radius, radius, Path.Direction.CW);
canvas.clipPath(path);
super.onDraw(canvas);
}
private void init(AttributeSet attrs, int defStyle) {
TypedArray a = Utils.CONTEXT.getTheme().obtainStyledAttributes(attrs, R.styleable.CircularImageView, 0, 0);
try {
image = a.getDrawable(R.styleable.CircularImageView_src);
} finally {
a.recycle();
}
this.setImageDrawable(image);
}
}
此外，在res/attrs.xml中添加以下代码来创建所需的属性
<declare-styleable name="CircularImageView">
<attr name="src" format="reference" />
</declare-styleable>
实际上，你可以使用谷歌提供的支持库RoundedBitmapDrawableFactory类(这里和这里)，而不是使用第三方库:
Gradle:
implementation 'androidx.appcompat:appcompat:1.0.0-beta01'
MainActivity.kt
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val originalDrawable = ContextCompat.getDrawable(this, R.drawable.avatar_1)!!
val bitmap = convertDrawableToBitmap(originalDrawable)
val drawable = RoundedBitmapDrawableFactory.create(resources, bitmap)
drawable.setAntiAlias(true)
drawable.cornerRadius = Math.max(bitmap.width, bitmap.height) / 2.0f
avatarImageView.setImageDrawable(drawable)
}
companion object {
@JvmStatic
fun convertDrawableToBitmap(drawable: Drawable): Bitmap {
if (drawable is BitmapDrawable)
return drawable.bitmap
// We ask for the bounds if they have been set as they would be most
// correct, then we check we are > 0
val bounds = drawable.bounds
val width = if (!bounds.isEmpty) bounds.width() else drawable.intrinsicWidth
val height = if (!bounds.isEmpty) bounds.height() else drawable.intrinsicHeight
// Now we check we are > 0
val bitmap = Bitmap.createBitmap(if (width <= 0) 1 else width, if (height <= 0) 1 else height,
Bitmap.Config.ARGB_8888)
val canvas = Canvas(bitmap)
drawable.setBounds(0, 0, canvas.width, canvas.height)
drawable.draw(canvas)
return bitmap
}
}
}
xml res - - activity_main布局。
<FrameLayout
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=".MainActivity">
<androidx.appcompat.widget.AppCompatImageView
android:id="@+id/avatarImageView" android:layout_width="100dp" android:layout_height="100dp"
android:layout_gravity="center"/>
</FrameLayout>
res - drawable avatar_1 xml。
<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="128dp" android:height="128dp"
android:viewportHeight="128.0" android:viewportWidth="128.0">
<path
android:fillColor="#FF8A80" android:pathData="M0 0h128v128h-128z"/>
<path
android:fillColor="#FFE0B2"
android:pathData="M36.3 94.8c6.4 7.3 16.2 12.1 27.3 12.4 10.7,-.3 20.3,-4.7 26.7,-11.6l.2.1c-17,-13.3,-12.9,-23.4,-8.5,-28.6 1.3,-1.2 2.8,-2.5 4.4,-3.9l13.1,-11c1.5,-1.2 2.6,-3 2.9,-5.1.6,-4.4,-2.5,-8.4,-6.9,-9.1,-1.5,-.2,-3 0,-4.3.6,-.3,-1.3,-.4,-2.7,-1.6,-3.5,-1.4,-.9,-2.8,-1.7,-4.2,-2.5,-7.1,-3.9,-14.9,-6.6,-23,-7.9,-5.4,-.9,-11,-1.2,-16.1.7,-3.3 1.2,-6.1 3.2,-8.7 5.6,-1.3 1.2,-2.5 2.4,-3.7 3.7l-1.8 1.9c-.3.3,-.5.6,-.8.8,-.1.1,-.2 0,-.4.2.1.2.1.5.1.6,-1,-.3,-2.1,-.4,-3.2,-.2,-4.4.6,-7.5 4.7,-6.9 9.1.3 2.1 1.3 3.8 2.8 5.1l11 9.3c1.8 1.5 3.3 3.8 4.6 5.7 1.5 2.3 2.8 4.9 3.5 7.6 1.7 6.8,-.8 13.4,-5.4 18.4,-.5.6,-1.1 1,-1.4 1.7,-.2.6,-.4 1.3,-.6 2,-.4 1.5,-.5 3.1,-.3 4.6.4 3.1 1.8 6.1 4.1 8.2 3.3 3 8 4 12.4 4.5 5.2.6 10.5.7 15.7.2 4.5,-.4 9.1,-1.2 13,-3.4 5.6,-3.1 9.6,-8.9 10.5,-15.2m-14.4,-49.8c.9 0 1.6.7 1.6 1.6 0 .9,-.7 1.6,-1.6 1.6,-.9 0,-1.6,-.7,-1.6,-1.6,-.1,-.9.7,-1.6 1.6,-1.6zm-25.7 0c.9 0 1.6.7 1.6 1.6 0 .9,-.7 1.6,-1.6 1.6,-.9 0,-1.6,-.7,-1.6,-1.6,-.1,-.9.7,-1.6 1.6,-1.6z"/>
<path
android:fillColor="#E0F7FA"
android:pathData="M105.3 106.1c-.9,-1.3,-1.3,-1.9,-1.3,-1.9l-.2,-.3c-.6,-.9,-1.2,-1.7,-1.9,-2.4,-3.2,-3.5,-7.3,-5.4,-11.4,-5.7 0 0 .1 0 .1.1l-.2,-.1c-6.4 6.9,-16 11.3,-26.7 11.6,-11.2,-.3,-21.1,-5.1,-27.5,-12.6,-.1.2,-.2.4,-.2.5,-3.1.9,-6 2.7,-8.4 5.4l-.2.2s-.5.6,-1.5 1.7c-.9 1.1,-2.2 2.6,-3.7 4.5,-3.1 3.9,-7.2 9.5,-11.7 16.6,-.9 1.4,-1.7 2.8,-2.6 4.3h109.6c-3.4,-7.1,-6.5,-12.8,-8.9,-16.9,-1.5,-2.2,-2.6,-3.8,-3.3,-5z"/>
<path
android:fillColor="#444" android:pathData="M76.3,47.5 m-2.0, 0 a 2.0,2.0 0 1,1 4.0,0 a2.0,2.0 0 1,1 -4.0,0"/>
<path
android:fillColor="#444" android:pathData="M50.7,47.6 m-2.0, 0 a 2.0,2.0 0 1,1 4.0,0 a2.0,2.0 0 1,1 -4.0,0"/>
<path
android:fillColor="#444"
android:pathData="M48.1 27.4c4.5 5.9 15.5 12.1 42.4 8.4,-2.2,-6.9,-6.8,-12.6,-12.6,-16.4 17.2 1.5 14.1,-9.4 14.1,-9.4,-1.4 5.5,-11.1 4.4,-11.1 4.4h-18.8c-1.7,-.1,-3.4 0,-5.2.3,-12.8 1.8,-22.6 11.1,-25.7 22.9 10.6,-1.9 15.3,-7.6 16.9,-10.2z"/>
</vector>
结果:
并且，假设你想在它上面添加一个边框，你可以使用下面的例子:
stroke_drawable.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval">
<stroke
android:width="4dp" android:color="@android:color/black"/>
</shape>
并添加android:前台="@drawable/stroke_drawable"到布局XML文件中的ImageView，你会得到这个:
不过，我不确定如何添加阴影(这将适用于较旧的Android版本)。使用FloatingActionButton(从“com.google.android. button”材料:材料"依赖)，我未能使位图填充FAB本身。如果它能起作用，那么使用它会更好。
编辑:如果你想添加立面阴影(可从API 21)，你可以改变一点我写的:
在布局XML文件内部:
<androidx.appcompat.widget.AppCompatImageView android:padding="4dp"
android:id="@+id/avatarImageView" android:layout_width="100dp" android:layout_height="100dp" android:elevation="8dp"
android:layout_gravity="center" android:background="@drawable/stroke_drawable" tools:srcCompat="@drawable/avatar_1"/>
CircularShadowViewOutlineProvider.kt
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
class CircularShadowViewOutlineProvider : ViewOutlineProvider() {
override fun getOutline(view: View, outline: Outline) {
val size = Math.max(view.width, view.height)
outline.setRoundRect(0, 0, size, size, size / 2f)
}
}
在代码:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
avatarImageView.outlineProvider = CircularShadowViewOutlineProvider()
结果:
2021年更新:使用Glide v4 CircleCrop参见https://bumptech.github.io/glide/doc/generatedapi.html
implementation 'com.github.bumptech.glide:glide:4.11.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'
XML
<ImageView
android:id="@+id/vinyl"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:ignore="ContentDescription" />
在代码中
Glide.with(this)
.load("https://images.pexels.com/photos/3828241/pexels-photo-3828241.jpeg")
.transform(CircleCrop())
.into(rootView.findViewById<ImageView>(R.id.vinyl))
如果您希望将图像切割成圆形显示，可以这样做
public static Bitmap getCircularBitmap(Bitmap bitmap) {
Bitmap output;
if (bitmap.getWidth() > bitmap.getHeight()) {
output = Bitmap.createBitmap(bitmap.getHeight(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
} else {
output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getWidth(), Bitmap.Config.ARGB_8888);
}
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
float r = 0;
if (bitmap.getWidth() > bitmap.getHeight()) {
r = bitmap.getHeight() / 2;
} else {
r = bitmap.getWidth() / 2;
}
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawCircle(r, r, r, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
如果使用src属性，上述方法似乎不起作用。我所做的是把两个图像视图放在一个框架布局中，一个在另一个上面，就像这样:
<FrameLayout android:id="@+id/frame"
android:layout_width="40dp"
android:layout_height="40dp">
<ImageView android:id="@+id/pic"
android:layout_width="40dp"
android:layout_height="40dp"
android:src="@drawable/my_picture" />
<ImageView android:id="@+id/circle_crop"
android:layout_width="40dp"
android:layout_height="40dp"
android:src="@drawable/circle_crop" />
</FrameLayout>
简单地把一个circular_crop.png放在你的可绘制文件夹中，它是你的图像尺寸的形状(在我的例子中是一个正方形)，白色背景，中间是一个透明的圆。如果你想要一个正方形imageview，你可以使用这个图像。
下载上面的图片。
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