目前一些比较火的图片加载库虽然支持圆角加载,若你是接的别人作了一半的项目,刚好别人用的图片加载库刚好不支持圆角加载,那么这颗控件你值得拥有.(支持网络图片的加载)
1.创建CustomImageView 类在你的项目中(源码如下)
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;
import com.towatt.charge.towatt.R;
/**
* @author Mr.lynn
* @version 1.0<br>
* 图片圆角实现
*/
public class CustomImageView extends android.support.v7.widget.AppCompatImageView {
private Paint paint;
private Paint paintBorder;
private Bitmap mSrcBitmap;
/**
* 圆角的弧度
*/
private float mRadius;
private boolean mIsCircle;
public CustomImageView(
final Context context) {
this(context,
null);
}
public CustomImageView(Context context, AttributeSet attrs) {
this(context, attrs, R.attr.customImageViewStyle);
}
public CustomImageView(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
TypedArray ta = context.obtainStyledAttributes(attrs,
R.styleable.CustomImageView, defStyle,
0);
mRadius = ta.getDimension(R.styleable.CustomImageView_radius,
0);
mIsCircle = ta.getBoolean(R.styleable.CustomImageView_circle,
false);
int srcResource = attrs.getAttributeResourceValue(
"http://schemas.android.com/apk/res/android",
"src",
0);
if (srcResource !=
0)
mSrcBitmap = BitmapFactory.decodeResource(getResources(),
srcResource);
ta.recycle();
paint =
new Paint();
paint.setAntiAlias(
true);
paintBorder =
new Paint();
paintBorder.setAntiAlias(
true);
}
@Override
public void onDraw(Canvas canvas) {
int width = canvas.getWidth() - getPaddingLeft() - getPaddingRight();
int height = canvas.getHeight() - getPaddingTop() - getPaddingBottom();
Bitmap image = drawableToBitmap(getDrawable());
if (mIsCircle) {
Bitmap reSizeImage = reSizeImageC(image, width, height);
canvas.drawBitmap(createCircleImage(reSizeImage, width, height),
getPaddingLeft(), getPaddingTop(),
null);
}
else {
Bitmap reSizeImage = reSizeImage(image, width, height);
canvas.drawBitmap(createRoundImage(reSizeImage, width, height),
getPaddingLeft(), getPaddingTop(),
null);
}
}
/**
* 画圆角
*
* @param source
* @param width
* @param height
* @return
*/
private Bitmap
createRoundImage(Bitmap source,
int width,
int height) {
Paint paint =
new Paint();
paint.setAntiAlias(
true);
Bitmap target = Bitmap.createBitmap(width, height, Config.ARGB_8888);
Canvas canvas =
new Canvas(target);
RectF rect =
new RectF(
0,
0, width, height);
canvas.drawRoundRect(rect, mRadius, mRadius, paint);
paint.setXfermode(
new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(source,
0,
0, paint);
return target;
}
/**
* 画圆
*
* @param source
* @param width
* @param height
* @return
*/
private Bitmap
createCircleImage(Bitmap source,
int width,
int height) {
Paint paint =
new Paint();
paint.setAntiAlias(
true);
Bitmap target = Bitmap.createBitmap(width, height, Config.ARGB_8888);
Canvas canvas =
new Canvas(target);
canvas.drawCircle(width /
2, height /
2, Math.min(width, height) /
2,
paint);
paint.setXfermode(
new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(source, (width - source.getWidth()) /
2,
(height - source.getHeight()) /
2, paint);
return target;
}
@Override
protected void onMeasure(
int widthMeasureSpec,
int heightMeasureSpec) {
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
setMeasuredDimension(width, height);
}
/**
* drawable转bitmap
*
* @param drawable
* @return
*/
private Bitmap
drawableToBitmap(Drawable drawable) {
if (drawable ==
null) {
if (mSrcBitmap !=
null) {
return mSrcBitmap;
}
else {
return null;
}
}
else if (drawable
instanceof BitmapDrawable) {
return ((BitmapDrawable) drawable).getBitmap();
}
Bitmap 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;
}
/**
* 重设Bitmap的宽高
*
* @param bitmap
* @param newWidth
* @param newHeight
* @return
*/
private Bitmap
reSizeImage(Bitmap bitmap,
int newWidth,
int newHeight) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
float scaleWidth = ((
float) newWidth) / width;
float scaleHeight = ((
float) newHeight) / height;
Matrix matrix =
new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
return Bitmap.createBitmap(bitmap,
0,
0, width, height, matrix,
true);
}
/**
* 重设Bitmap的宽高
*
* @param bitmap
* @param newWidth
* @param newHeight
* @return
*/
private Bitmap
reSizeImageC(Bitmap bitmap,
int newWidth,
int newHeight) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int x = (newWidth - width) /
2;
int y = (newHeight - height) /
2;
if (x >
0 && y >
0) {
return Bitmap.createBitmap(bitmap,
0,
0, width, height,
null,
true);
}
float scale =
1;
if (width > height) {
scale = ((
float) newWidth) / width;
}
else {
scale = ((
float) newHeight) / height;
}
Matrix matrix =
new Matrix();
matrix.postScale(scale, scale);
return Bitmap.createBitmap(bitmap,
0,
0, width, height, matrix,
true);
}
}
2.在values目录下创建attrs.xml(若是已存在该文件)直接复制如下代码既可
<resources>
<declare-styleable name="Theme">
<attr name="customImageViewStyle" format="reference" />
</declare-styleable>
<declare-styleable name="CustomImageView">
<attr name="circle" format="boolean" />
<attr name="radius" format="dimension" />
</declare-styleable>
</resources>
3.正确的使用方式(在布局文件中)
注意此路径是你控件所在包
<com.xxx.xxx.view.CustomImageView
android:layout_marginTop="5dp"
android:layout_width="77dp"
android:layout_height="77dp"
lynn:radius="@dimen/size_10dp"
android:src="@drawable/position_icon"
android:id="@+id/iv_build_icon" />
感觉有用欢迎转发 评论 分享
