XCRoundImageView.java
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package com.hh.xuetubao.Utils;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
public class XCRoundImageView extends android.support.v7.widget.AppCompatImageView {
private Paint paint;
public XCRoundImageView(Context context) {
this(context, null);
}
public XCRoundImageView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public XCRoundImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
paint = new Paint();
}
/**
* 绘制圆形图片
*
* @author caizhiming
*/
@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
if (null != drawable) {
// Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();//此方法报错
Bitmap bitmap = drawableToBitmap(drawable);//使用此方法将drawable转换成bitmap
Bitmap b = getCircleBitmap(bitmap, 14);
final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight());
final Rect rectDest = new Rect(0, 0, getWidth(), getHeight());
paint.reset();
canvas.drawBitmap(b, rectSrc, rectDest, paint);
} else {
super.onDraw(canvas);
}
}
/**
* 将Drawable转换成bitmap
*
* @param drawable
* @return
*/
public static Bitmap drawableToBitmap(Drawable drawable) {
int w = drawable.getIntrinsicWidth();
int h = drawable.getIntrinsicHeight();
Bitmap.Config config =
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565;
Bitmap bitmap = Bitmap.createBitmap(w, h, config);
//注意，下面三行代码要用到，否则在View或者SurfaceView里的canvas.drawBitmap会看不到图
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, w, h);
drawable.draw(canvas);
return bitmap;
}
/**
* 获取圆形图片方法
*
* @param bitmap
* @param pixels
* @return Bitmap
* @author caizhiming
*/
private Bitmap getCircleBitmap(Bitmap bitmap, int pixels) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
bitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
int x = bitmap.getWidth();
canvas.drawCircle(x / 2, x / 2, x / 2, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
}