布局先了解一下
<ImageView
android:id="@+id/iv_img_shop"
android:layout_width="120dp"
android:layout_height="80dp"
android:scaleType="centerCrop"
android:src="@drawable/background4" />
---------------------
工具類拿去用
public class CornerTransform implements Transformation<Bitmap> {
private BitmapPool mBitmapPool;
private float radius;
private boolean exceptLeftTop, exceptRightTop, exceptLeftBottom, exceptRightBotoom;
/**
* 除了那幾個角不需要圓角的
*
* @param leftTop
* @param rightTop
* @param leftBottom
* @param rightBottom
*/
public void setExceptCorner(boolean leftTop, boolean rightTop, boolean leftBottom, boolean rightBottom) {
this.exceptLeftTop = leftTop;
this.exceptRightTop = rightTop;
this.exceptLeftBottom = leftBottom;
this.exceptRightBotoom = rightBottom;
}
public CornerTransform(Context context, float radius) {
this.mBitmapPool = Glide.get(context).getBitmapPool();
this.radius = radius;
}
@Override
public Resource<Bitmap> transform(Resource<Bitmap> resource, int outWidth, int outHeight) {
Bitmap source = resource.get();
int finalWidth, finalHeight;
float ratio; //輸出目标的寬高或高寬比例
if (outWidth > outHeight) { //輸出寬度>輸出高度,求高寬比
ratio = (float) outHeight / (float) outWidth;
finalWidth = source.getWidth();
finalHeight = (int) ((float) source.getWidth() * ratio); //固定原圖寬度,求最終高度
if (finalHeight > source.getHeight()) { //求出的最終高度>原圖高度,求寬高比
ratio = (float) outWidth / (float) outHeight;
finalHeight = source.getHeight();
finalWidth = (int) ((float) source.getHeight() * ratio);//固定原圖高度,求最終寬度
}
} else if (outWidth < outHeight) { //輸出寬度 < 輸出高度,求寬高比
ratio = (float) outWidth / (float) outHeight;
finalHeight = source.getHeight();
finalWidth = (int) ((float) source.getHeight() * ratio);//固定原圖高度,求最終寬度
if (finalWidth > source.getWidth()) { //求出的最終寬度 > 原圖寬度,求高寬比
ratio = (float) outHeight / (float) outWidth;
finalWidth = source.getWidth();
finalHeight = (int) ((float) source.getWidth() * ratio);
}
} else { //輸出寬度=輸出高度
finalHeight = source.getHeight();
finalWidth = finalHeight;
}
//修正圓角
this.radius *= (float) finalHeight / (float) outHeight;
Bitmap outBitmap = this.mBitmapPool.get(finalWidth, finalHeight, Bitmap.Config.ARGB_8888);
if (outBitmap == null) {
outBitmap = Bitmap.createBitmap(finalWidth, finalHeight, Bitmap.Config.ARGB_8888);
}
Canvas canvas = new Canvas(outBitmap);
Paint paint = new Paint();
//關聯畫筆繪制的原圖bitmap
BitmapShader shader = new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
//計算中心位置,進行偏移
int width = (source.getWidth() - finalWidth) / 2;
int height = (source.getHeight() - finalHeight) / 2;
if (width != 0 || height != 0) {
Matrix matrix = new Matrix();
matrix.setTranslate((float) (-width), (float) (-height));
shader.setLocalMatrix(matrix);
}
paint.setShader(shader);
paint.setAntiAlias(true);
RectF rectF = new RectF(0.0F, 0.0F, (float) canvas.getWidth(), (float) canvas.getHeight());
canvas.drawRoundRect(rectF, this.radius, this.radius, paint); //先繪制圓角矩形
if (exceptLeftTop) { //左上角不為圓角
canvas.drawRect(0, 0, radius, radius, paint);
}
if (exceptRightTop) {//右上角不為圓角
canvas.drawRect(canvas.getWidth() - radius, 0, radius, radius, paint);
}
if (exceptLeftBottom) {//左下角不為圓角
canvas.drawRect(0, canvas.getHeight() - radius, radius, canvas.getHeight(), paint);
}
if (exceptRightBotoom) {//右下角不為圓角
canvas.drawRect(canvas.getWidth() - radius, canvas.getHeight() - radius, canvas.getWidth(), canvas.getHeight(), paint);
}
return BitmapResource.obtain(outBitmap, this.mBitmapPool);
}
@Override
public String getId() {
return this.getClass().getName();
}
}
在activity或Fragment或擴充卡中調用:
CornerTransform transformation = new CornerTransform(context, dip2px(context, 10));
//隻是繪制左上角和右上角圓角
transformation.setExceptCorner(false, false, false, false);
Glide.with(context)
.load(HttpContants.URL + list.get(position).getImage())
.asBitmap()
.skipMemoryCache(true)
.placeholder(R.drawable.background4)
.error(R.drawable.background4)
.transform(transformation)
.into(holder.ivImgShop);
還有一個方法:
public static int dip2px(Context context,float dpValue){
final float scale=context.getResources().getDisplayMetrics().density;
return(int)(dpValue*scale+0.5f);
}