android分享图片到微信,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;

}