Android 使ImageView适合CardView的宽度
我有一个圆角的Android 使ImageView适合CardView的宽度,android,imageview,android-appcompat,android-cardview,Android,Imageview,Android Appcompat,Android Cardview,我有一个圆角的cardwiew,我想在顶部有一个ImageView,如下面的材料设计指南示例所示 <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto" android:id="@+id/card_view" android:layout_width="wrap_content" android:layout_height="wr
cardwiew
,我想在顶部有一个ImageView
,如下面的材料设计指南示例所示
<android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
card_view:cardCornerRadius="4dp">
<!-- ... -->
</android.support.v7.widget.CardView>
如果我将card\u view:cardCornerRadius
设置为0dp
,则ImageView
会像我希望的那样适合卡
然而,国家规定卡片应该有圆角,而不是直角
我遇到的问题是,当我将card\u视图:cardCornerRadius
设置为0dp
以外的值时,例如4dp
,则会发生以下情况:
可以看出,ImageView
不适合CardView
我的问题是,当它有圆角时,如何使这个
ImageView
适合CardView
的布局。在drawable
文件夹中制作一个bck\u rounded.xml
。给它一个与卡片视图相同的半径
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<corners android:radius="4dp" />
</shape>
在imageView中应用:android:background=“@drawable/bck\u rounded”
编辑2015/09/29
增加了对选定拐角圆角的支持
也可以使用makeramen RoundeImage视图,
并移除CardView中的自动填充,以便在棒棒糖前使用
yourCardView.setPreventCornerOverlap(false)
然后设置显示cardview阴影所需的填充您需要做两件事: 1) 在您的CardView上调用
setPreventCornerOverlap(false)
2) 将四舍五入的图像视图放入CardView内部
关于将imageview四舍五入,我遇到了同样的问题,因此我制作了一个库,您可以在每个角上设置不同的半径。有一个很好的库(vinc3m1的RoundedImageView)支持ImageView上的圆角,但它只支持每个角上相同的半径。但我希望它只在左上角和右上角圆滑
最后我得到了下面我想要的结果
我通过将RoundedImageView
放在CardView
中来实现这一点。您还需要设置相应的CardView
属性
如果图像大小(宽度)与ImageView
宽度固定,您只需将ImageView
属性更改为:
android:scaleType="fitXY"
就是。没有额外的图像圆角,没有繁忙的工作。除此之外,它还可以提高应用程序的性能
注意:我的建议可能不适用于大尺寸的小图像
ImageView
我解决了设置问题1)
app:cardUseCompatding=“false”
2) 设置圆形
imageView
背景
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<corners android:radius="4dp" />
</shape>
您必须自定义图像视图
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
public class RoundedImageView extends android.support.v7.widget.AppCompatImageView {
private Paint mPaint;
private Path mPath;
private Bitmap mBitmap;
private Matrix mMatrix;
private int mRadius = convertDpToPixel(10);
private int mWidth;
private int mHeight;
private Drawable mDrawable;
public RoundedImageView(Context context) {
super(context);
init();
}
public RoundedImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public RoundedImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
mPaint = new Paint();
mPaint.setColor(Color.WHITE);
mPath = new Path();
}
public int convertDpToPixel(int dp) {
DisplayMetrics displayMetrics = Resources.getSystem().getDisplayMetrics();
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, displayMetrics);
}
@Override
public void setImageDrawable(Drawable drawable) {
mDrawable = drawable;
if (drawable == null) {
return;
}
mBitmap = drawableToBitmap(drawable);
int bDIWidth = mBitmap.getWidth();
int bDIHeight = mBitmap.getHeight();
//Fit to screen.
float scale;
if ((mHeight / (float) bDIHeight) >= (mWidth / (float) bDIWidth)) {
scale = mHeight / (float) bDIHeight;
} else {
scale = mWidth / (float) bDIWidth;
}
float borderLeft = (mWidth - (bDIWidth * scale)) / 2;
float borderTop = (mHeight - (bDIHeight * scale)) / 2;
mMatrix = getImageMatrix();
RectF drawableRect = new RectF(0, 0, bDIWidth, bDIHeight);
RectF viewRect = new RectF(borderLeft, borderTop, (bDIWidth * scale) + borderLeft, (bDIHeight * scale) + borderTop);
mMatrix.setRectToRect(drawableRect, viewRect, Matrix.ScaleToFit.CENTER);
invalidate();
}
private Bitmap drawableToBitmap(Drawable drawable) {
Bitmap bitmap;
if (drawable instanceof BitmapDrawable) {
BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
if (bitmapDrawable.getBitmap() != null) {
return bitmapDrawable.getBitmap();
}
}
if (drawable.getIntrinsicWidth() <= 0 || drawable.getIntrinsicHeight() <= 0) {
bitmap = Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888); // Single color bitmap will be created of 1x1 pixel
} else {
bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
}
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mWidth = MeasureSpec.getSize(widthMeasureSpec);
mHeight = MeasureSpec.getSize(heightMeasureSpec);
if ((mDrawable != null) && (mHeight > 0) && (mWidth > 0)) {
setImageDrawable(mDrawable);
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mBitmap == null) {
return;
}
canvas.drawColor(Color.TRANSPARENT);
mPath.reset();
mPath.moveTo(0, mRadius);
mPath.lineTo(0, canvas.getHeight());
mPath.lineTo(canvas.getWidth(), canvas.getHeight());
mPath.lineTo(canvas.getWidth(), mRadius);
mPath.quadTo(canvas.getWidth(), 0, canvas.getWidth() - mRadius, 0);
mPath.lineTo(mRadius, 0);
mPath.quadTo(0, 0, 0, mRadius);
canvas.drawPath(mPath, mPaint);
canvas.clipPath(mPath);
canvas.drawBitmap(mBitmap, mMatrix, mPaint);
}
}
导入android.content.Context;
导入android.graphics.Bitmap;
导入android.graphics.Canvas;
导入android.graphics.Color;
导入android.graphics.Matrix;
导入android.graphics.Paint;
导入android.graphics.Path;
导入android.graphics.RectF;
导入android.graphics.drawable.BitmapDrawable;
导入android.graphics.drawable.drawable;
导入android.util.AttributeSet;
公共类RoundedImageView扩展了android.support.v7.widget.AppCompatImageView{
私人油漆;
专用路径mPath;
私有位图mBitmap;
私有矩阵矩阵;
private int mRadius=convertDpToPixel(10);
私人英特姆维兹;
私营机构;
私人可提取;
public RoundedImageView(上下文){
超级(上下文);
init();
}
public RoundedImageView(上下文、属性集属性){
超级(上下文,attrs);
init();
}
public RoundedImageView(上下文上下文、属性集属性、int defStyleAttr){
super(上下文、attrs、defStyleAttr);
init();
}
私有void init(){
mPaint=新油漆();
mPaint.setColor(Color.WHITE);
mPath=新路径();
}
公共int convertDpToPixel(int-dp){
DisplayMetrics DisplayMetrics=Resources.getSystem().getDisplayMetrics();
返回(int)TypedValue.applyDimension(TypedValue.COMPLEX\u UNIT\u DIP,dp,displayMetrics);
}
@凌驾
公共void setImageDrawable(可提取可提取){
mDrawable=可绘制;
if(可绘制==null){
返回;
}
mBitmap=drawableToBitmap(可绘制);
int bDIWidth=mBitmap.getWidth();
int bDIHeight=mBitmap.getHeight();
//适合屏幕。
浮标;
如果((mHeight/(float)bDIHeight)>=(mWidth/(float)bDIWidth)){
刻度=mHweight/(浮动)bDiHweight;
}否则{
刻度=mWidth/(浮动)bDIWidth;
}
浮动边框左=(mWidth-(bDIWidth*比例))/2;
浮动边界顶部=(mHweight-(bDiHweight*比例))/2;
mMatrix=getImageMatrix();
RectF drawableRect=新的RectF(0,0,bDIWidth,bDIHeight);
RectF viewRect=新的RectF(borderLeft,borderTop,(BDI宽度*比例)+borderLeft,(BDI高度*比例)+borderTop);
mMatrix.setRectRect(drawableRect、viewRect、Matrix.ScaleToFit.CENTER);
使无效();
}
私有位图drawableToBitmap(可绘制可绘制){
位图;
if(BitmapDrawable的可绘制实例){
BitmapDrawable BitmapDrawable=(BitmapDrawable)drawable;
if(bitmapDrawable.getBitmap()!=null){
返回bitmapDrawable.getBitmap();
}
}
if(drawable.getIntrinsicWidth()0)){
setImageDrawable(MDraawable);
}
}
@凌驾
受保护的void onDraw(画布){
super.onDraw(帆布);
if(mBitmap==null){
返回;
}
画布。drawColor(颜色。透明);
mPath.reset();
移动到(0,mRadius);
lineTo(0,canvas.getHeight());
lineTo(canvas.getWidth(),canvas.getHeight());
mPath.lineTo(canvas.getWidth(),mRadius);
mPath.quadTo(canvas.getWidth(),0,canvas.getWidth()-mRadius,0);
mPath.lineTo(mRadius,0);
四分位数(0,0,0,mRadius);
帆布
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
public class RoundedImageView extends android.support.v7.widget.AppCompatImageView {
private Paint mPaint;
private Path mPath;
private Bitmap mBitmap;
private Matrix mMatrix;
private int mRadius = convertDpToPixel(10);
private int mWidth;
private int mHeight;
private Drawable mDrawable;
public RoundedImageView(Context context) {
super(context);
init();
}
public RoundedImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public RoundedImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
mPaint = new Paint();
mPaint.setColor(Color.WHITE);
mPath = new Path();
}
public int convertDpToPixel(int dp) {
DisplayMetrics displayMetrics = Resources.getSystem().getDisplayMetrics();
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, displayMetrics);
}
@Override
public void setImageDrawable(Drawable drawable) {
mDrawable = drawable;
if (drawable == null) {
return;
}
mBitmap = drawableToBitmap(drawable);
int bDIWidth = mBitmap.getWidth();
int bDIHeight = mBitmap.getHeight();
//Fit to screen.
float scale;
if ((mHeight / (float) bDIHeight) >= (mWidth / (float) bDIWidth)) {
scale = mHeight / (float) bDIHeight;
} else {
scale = mWidth / (float) bDIWidth;
}
float borderLeft = (mWidth - (bDIWidth * scale)) / 2;
float borderTop = (mHeight - (bDIHeight * scale)) / 2;
mMatrix = getImageMatrix();
RectF drawableRect = new RectF(0, 0, bDIWidth, bDIHeight);
RectF viewRect = new RectF(borderLeft, borderTop, (bDIWidth * scale) + borderLeft, (bDIHeight * scale) + borderTop);
mMatrix.setRectToRect(drawableRect, viewRect, Matrix.ScaleToFit.CENTER);
invalidate();
}
private Bitmap drawableToBitmap(Drawable drawable) {
Bitmap bitmap;
if (drawable instanceof BitmapDrawable) {
BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
if (bitmapDrawable.getBitmap() != null) {
return bitmapDrawable.getBitmap();
}
}
if (drawable.getIntrinsicWidth() <= 0 || drawable.getIntrinsicHeight() <= 0) {
bitmap = Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888); // Single color bitmap will be created of 1x1 pixel
} else {
bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
}
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mWidth = MeasureSpec.getSize(widthMeasureSpec);
mHeight = MeasureSpec.getSize(heightMeasureSpec);
if ((mDrawable != null) && (mHeight > 0) && (mWidth > 0)) {
setImageDrawable(mDrawable);
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mBitmap == null) {
return;
}
canvas.drawColor(Color.TRANSPARENT);
mPath.reset();
mPath.moveTo(0, mRadius);
mPath.lineTo(0, canvas.getHeight());
mPath.lineTo(canvas.getWidth(), canvas.getHeight());
mPath.lineTo(canvas.getWidth(), mRadius);
mPath.quadTo(canvas.getWidth(), 0, canvas.getWidth() - mRadius, 0);
mPath.lineTo(mRadius, 0);
mPath.quadTo(0, 0, 0, mRadius);
canvas.drawPath(mPath, mPaint);
canvas.clipPath(mPath);
canvas.drawBitmap(mBitmap, mMatrix, mPaint);
}
}
<com.example.widget.RoundedImageViewmageView
android:id="@+id/ivProductImg"
android:layout_width="match_parent"
android:layout_height="150dp"
android:scaleType="fitXY"
/>
android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="160dp"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
app:cardCornerRadius="8dp"
android:elevation="10dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/kmp_warna1"
android:scaleType="centerCrop"/>
</android.support.v7.widget.CardView>
class MaskedCardView @JvmOverloads constructor(
context: Context,
attrs: AttributeSet? = null,
defStyle: Int = R.attr.materialCardViewStyle
) : MaterialCardView(context, attrs, defStyle) {
@SuppressLint("RestrictedApi")
private val pathProvider = ShapeAppearancePathProvider()
private val path: Path = Path()
private val shapeAppearance: ShapeAppearanceModel = ShapeAppearanceModel.builder(
context,
attrs,
defStyle,
R.style.Widget_MaterialComponents_CardView
).build()
private val rectF = RectF(0f, 0f, 0f, 0f)
override fun onDraw(canvas: Canvas) {
canvas.clipPath(path)
super.onDraw(canvas)
}
@SuppressLint("RestrictedApi")
override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
rectF.right = w.toFloat()
rectF.bottom = h.toFloat()
pathProvider.calculatePath(shapeAppearance, 1f, rectF, path)
super.onSizeChanged(w, h, oldw, oldh)
}
}