Android微信分享图片踩坑之旅

• 分享图片代码如下
• bitmap.recycle() 资源被回收了，所以每次分享的bitmap必须是重新创建出来的

/**
 * 微信图片分享
 *
 * @param shareType {@link SendMessageToWX.Req#WXSceneSession} 分享给微信好友
 *                  {@link SendMessageToWX.Req#WXSceneTimeline} 分享给朋友圈
 *                  {@link SendMessageToWX.Req#WXSceneFavorite} 收藏
 */
public static void shareToWXImage(int shareType, @NonNull Bitmap bitmap, @NonNull OnShareListener listener) {
    if (checkWeChatShareInit(listener)) {
        WXMediaMessage msg = new WXMediaMessage();
        msg.mediaObject = new WXImageObject(bitmap);

        Bitmap thumbBmp = Bitmap.createScaledBitmap(bitmap, SHARE_THUMBNAIL_SIZE, SHARE_THUMBNAIL_SIZE, true);
        bitmap.recycle();
        msg.thumbData = Util.bmpToByteArray(thumbBmp, true);  // 设置缩略图

        SendMessageToWX.Req req = new SendMessageToWX.Req();
        req.transaction = buildTransaction("img");
        req.message = msg;
        req.scene = shareType;
        mWXApi.sendReq(req);
    }
}

• 分享的图片黑屏
• 原因是图片透明部分不做处理就是黑色的，那块区域没有颜色
• 方法是透明转白色

/**
 * bitmap中的透明色用白色替换
 *
 * @param bitmap
 * @return
 */
public static Bitmap changeColor(Bitmap bitmap) {
    if (bitmap == null) {
        return null;
    }
    int w = bitmap.getWidth();
    int h = bitmap.getHeight();
    int[] colorArray = new int[w * h];
    int n = 0;
    for (int i = 0; i < h; i++) {
        for (int j = 0; j < w; j++) {
            int color = getMixtureWhite(bitmap.getPixel(j, i));
            colorArray[n++] = color;
        }
    }
    return Bitmap.createBitmap(colorArray, w, h, Bitmap.Config.ARGB_8888);
}

/**
 * 获取和白色混合颜色
 *
 * @return
 */
private static int getMixtureWhite(int color) {
    int alpha = Color.alpha(color);
    int red = Color.red(color);
    int green = Color.green(color);
    int blue = Color.blue(color);
    return Color.rgb(getSingleMixtureWhite(red, alpha), getSingleMixtureWhite

                    (green, alpha),
            getSingleMixtureWhite(blue, alpha));
}

/**
 * 获取单色的混合值
 *
 * @param color
 * @param alpha
 * @return
 */
private static int getSingleMixtureWhite(int color, int alpha) {
    int newColor = color * alpha / 255 + 255 - alpha;
    return newColor > 255 ? 255 : newColor;
}