我正在开发一个
Android应用程序.在我的应用程序中,我一起使用CardView和ImageView.但我在设计CardView内部的ImageView时遇到了问题.问题在于ImageView的圆角半径半径.请参阅下面的我的场景.
I have xml layout for adapter item like this.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_marginTop="5dp"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
card_view:cardCornerRadius="5dp"
android:layout_width="match_parent"
android:id="@+id/di_card_container"
android:layout_height="wrap_content">
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/di_iv_image"
android:scaleType="centerCrop"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<RelativeLayout
android:padding="10dp"
android:layout_below="@id/di_iv_image"
android:layout_alignParentLeft="true"
android:layout_alignParentBottom="true"
android:id="@+id/di_name_container"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:textSize="15dp"
android:textColor="@color/textColorPrimary"
android:id="@+id/di_tv_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
</RelativeLayout>
</android.support.v7.widget.CardView>
正如您所看到的那样,我将CardView的圆角半径设置为5dp,而ImageView with则适合其父CardView的宽度.问题是ImageView的顶角不像其父CardView的角落那样弯曲.
This is the screenshot
通常,CardView的子视图角会自动弯曲,如果它适合父CardView.对？那么为什么我的ImageView不工作？请问我的代码有什么问题？我该怎么办呢？
解决方法
所以这是前棒棒糖的常见行为.以下是修复它的步骤：
第1步：将以下属性添加到您的cardView
card_view:cardUseCompatPadding="true" card_view:cardPreventCornerOverlap="false" card_view:cardCornerRadius="10dp"
第2步：使用围绕其顶部边框的自定义ImageView：
public class RoundedTopImageView extends ImageView {
private Paint mPaint;
private Path mPath;
private Bitmap mBitmap;
private Matrix mMatrix;
private int mRadius = displayUtils.convertDpToPixel(10);
private int mWidth;
private int mHeight;
private Drawable mDrawable;
public RoundedTopImageView(Context context) {
super(context);
init();
}
public RoundedTopImageView(Context context,AttributeSet attrs) {
super(context,attrs);
init();
}
public RoundedTopImageView(Context context,AttributeSet attrs,int defStyleAttr) {
super(context,attrs,defStyleAttr);
init();
}
private void init() {
mPaint = new Paint();
mPaint.setColor(Color.WHITE);
mPath = new Path();
}
@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,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,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(),mRadius);
mPath.quadTo(canvas.getWidth(),canvas.getWidth() - mRadius,0);
mPath.lineto(mRadius,0);
mPath.quadTo(0,mRadius);
canvas.drawPath(mPath,mPaint);
canvas.clipPath(mPath);
canvas.drawBitmap(mBitmap,mMatrix,mPaint);
}
}
第3步：只需使用RoundedTopImageView替换xml中的ImageView
第4步：在代码中将其用作常规imageView,例如使用Picasso：
RoundedTopImageView image = (RoundedTopImageView) findViewById(R.id.di_iv_image);
Picasso.with(context)
.load("Some cool Url")
.into(image);
编辑：添加了convertDpToPixel函数
抱歉,我忘了添加这个,这是一个Util类的一部分,你可以在任何你想要的地方添加(在我的displayUtils类中)：
public static int convertDpToPixel(int dp) {
displayMetrics displayMetrics = Resources.getSystem().getdisplayMetrics();
return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,dp,displayMetrics);
}