错误来源
在使用xutils中框架时报错,不能转换成位图: java.lang.ClassCastException: org.xutils.image.AsyncDrawable cannot be cast android.graphics.drawable.BitmapDrawable
查看了许多博客却发现只有片段代码,却不知道怎么改
在这里记录一下
实现圆形图片
新建一个java类
全部代码如下,直接copy过去,已经改好
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;
import androidx.annotation.Nullable;
import androidx.appcompat.widget.AppCompatImageView;
public class CircleImageView extends AppCompatImageView {
//画笔
private Paint mPaint;
//圆形图片的半径
private int mRadius;
//图片的宿放比例
private float mScale;
public CircleImageView(Context context) {
super(context);
}
public CircleImageView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public CircleImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//由于是圆形,宽高应保持一致
int size = Math.min(getMeasuredWidth(), getMeasuredHeight());
mRadius = size / 2;
setMeasuredDimension(size, size);
}
@SuppressLint("DrawAllocation")
@Override
protected void onDraw(Canvas canvas) {
mPaint = new Paint();
Drawable drawable = getDrawable();
if (null != drawable) {
Bitmap bitmap = drawableToBitmap(drawable);
//初始化BitmapShader,传入bitmap对象
BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
//计算缩放比例
mScale = (mRadius * 2.0f) / Math.min(bitmap.getHeight(), bitmap.getWidth());
Matrix matrix = new Matrix();
matrix.setScale(mScale, mScale);
bitmapShader.setLocalMatrix(matrix);
mPaint.setShader(bitmapShader);
//画圆形,指定好坐标,半径,画笔
canvas.drawCircle(mRadius, mRadius, mRadius, mPaint);
} else {
super.onDraw(canvas);
}
}
public static final Bitmap drawableToBitmap(Drawable drawable) {
Bitmap bitmap = Bitmap.createBitmap( drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
}
}
这样直接就可以在xml布局中引用了,而且完美解决xutils中加载网络图片却不能转换bitmap,最终实现圆形图片