MGWebRoundCornerImageView.java

package com.mogujie.widget.imageview;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.RectF;
import android.util.AttributeSet;

import com.squareup.picasso.Picasso;
import com.squareup.picasso.Transformation;

/**
 * Created by kelei on 14-2-19.
 */
public class MGWebRoundCornerImageView extends MGWebImageView implements Transformation {

    private static final int DEFAULT_CORNER_SIZE = 10;
    private int mCornerSize = DEFAULT_CORNER_SIZE;

    public MGWebRoundCornerImageView(Context context) {
        super(context);
    }

    public MGWebRoundCornerImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void setImageUrl(String url) {
        if (allowedUrl(url)/* && isAttachedOnWindow */) {
            mUrl = url;
            beginProcess(Picasso.with(getContext()).load(url).transform(this));
        }
    }

    @Override
    public Bitmap transform(Bitmap source) {
        if (source == null) {
            return null;
        }

        int w = source.getWidth(), h = source.getHeight();
        if (w <= 0 || h <= 0) {
            return null;
        }

        // 生成圆角
        Bitmap round = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(round);
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(Color.RED);
        canvas.drawRoundRect(new RectF(0, 0, w, h), mCornerSize, mCornerSize, paint);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));

        // 生成结果图片
        Bitmap out = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
        Canvas outCanvas = new Canvas(out);
        outCanvas.drawBitmap(source, 0, 0, null);
        outCanvas.drawBitmap(round, 0, 0, paint);
        source.recycle();
        round.recycle();

        return out;
    }

    @Override
    public String key() {
        return null;
    }

    public void setCornerSize(int cornerSize) {
        mCornerSize = cornerSize;
    }
}