package com.example.zhidingyi;
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.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.support.v7.widget.AppCompatImageView;
import android.util.AttributeSet;
public class ZhiDingYi extends AppCompatImageView {
private int mins;
public ZhiDingYi(Context context) {
super(context);
}
public ZhiDingYi(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int measuredHeight = getMeasuredHeight();
int measuredWidth = getMeasuredWidth();
mins = Math.min(measuredHeight, measuredWidth)/2;
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
}
@Override
protected void onDraw(Canvas canvas) {
Paint paint = new Paint();
float mScale=1;
paint.setColor(getResources().getColor(R.color.colorAccent));
BitmapDrawable drawable = (BitmapDrawable) getDrawable();
if (drawable != null) {
Bitmap bitmap = drawable.getBitmap();
BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
mScale = (mins*2.0f)/Math.min(bitmap.getHeight(), bitmap.getWidth());
Matrix matrix = new Matrix();
matrix.setScale(mScale, mScale);
bitmapShader.setLocalMatrix(matrix);
paint.setShader(bitmapShader);
canvas.drawCircle(mins, mins, mins, paint);
} else {
super.onDraw(canvas);
}
}
}