package com.letv.watchball.view;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import com.letv.cache.view.LetvImageView;
import com.letv.watchball.utils.LogInfo;
/**
* 圆形控件
*
* @author ljnalex
*
*/
public class RoundImageView extends LetvImageView {
private Paint paint;
private Bitmap bitmapSrc;
public RoundImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
}
private void init(Context context, AttributeSet attrs) {
paint = new Paint();
paint.setFilterBitmap(false);
paint.setAntiAlias(true);
}
@SuppressLint("DrawAllocation")
@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = getDrawable();
if (drawable != null) {
bitmapSrc = ((BitmapDrawable) drawable).getBitmap();
}
if (bitmapSrc != null) {
bitmapSrc = loadBitmap(bitmapSrc, getWidth());
canvas.drawBitmap(getCircleBitmap(bitmapSrc), 0, 0, paint);
} else {
super.onDraw(canvas);
}
}
/**
* 创建圆形位图
*
* @param bitmap
* @return
*/
public Bitmap getCircleBitmap(Bitmap bitmap) {
// 根据原始图片的宽、高,创建一个新的画布
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
bitmap.getWidth(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
// 根据原来图片大小画一个矩形
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
// 画笔
final Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(0xff424242);
// 画出一个圆
int radius = bitmap.getWidth() >> 1;
canvas.drawCircle(radius, radius, radius, paint);
// 取两层绘制交集,显示上层
// PorterDuff.Mode的原理,参考:http://blog.csdn.net/starfeng11/article/details/7000284
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
/**
* 图片裁剪
*
* @param src
* @param w
* @return
*/
private Bitmap loadBitmap(Bitmap src, int w) {
// 获得原始图片的宽高
int width = src.getWidth();
int height = src.getHeight();
// 计算缩放比例
float scaleWidth = ((float) w) / width;
float scaleHeight = ((float) w) / height;
// 取得想要缩放的matrix参数
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
// 得到新的图片
return Bitmap.createBitmap(src, 0, 0, width, height, matrix, true);
}
}