Android微信分享圖片按質量壓縮的解決方案

張欽發表於2018-03-09
Android

一、雜談

微信分享圖片的迷之bug，前一陣子接盤一個Hybrid App，分享要用原生的分享，搞了一陣子把微信分享搞上，測試又反饋了一個謎一樣的Bug，我這邊看Log列印了checkArgs fail, thumbData is invalid，google一番都說是圖片不能超過32kb，在分享裡面看到如下判斷this.thumbData.length > '耀'，一時間沒有反應過來。。。可是怎麼壓縮好哇，我參照官方Demo和AndroidUtilCode的按質量壓縮方法，找出了下面的解決方案，供大家參考。

二、將網路圖片載入到記憶體

儲存到本地在操作真心感覺麻煩

public static byte[] getHtmlByteArray(final String url) {
	URL htmlUrl = null;
	InputStream inStream = null;
	try {
		htmlUrl = new URL(url);
		URLConnection connection = htmlUrl.openConnection();
		HttpURLConnection httpConnection = (HttpURLConnection) connection;
		int responseCode = httpConnection.getResponseCode();
		if (responseCode == HttpURLConnection.HTTP_OK) {
			inStream = httpConnection.getInputStream();
		}
	} catch (MalformedURLException e) {
		e.printStackTrace();
	} catch (IOException e) {
		e.printStackTrace();
	}
	// 將io流轉為byte陣列
	byte[] data = inputStreamToByte(inStream);
	if (data.length > '耀') {

    	// 轉換為bitmap
    	Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
    
    	// 獲取壓縮後的byte陣列
    	data = compressByQuality(bitmap, '耀', true);
    }
    return data;
}
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三、將io流轉為byte陣列

public static byte[] inputStreamToByte(InputStream is) {
	try {
		ByteArrayOutputStream bytestream = new ByteArrayOutputStream();
		int ch;
		while ((ch = is.read()) != -1) {
			bytestream.write(ch);
		}
		byte imgdata[] = bytestream.toByteArray();
		bytestream.close();
		return imgdata;
	} catch (Exception e) {
		e.printStackTrace();
	}

	return null;
}
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四、按質量壓縮

/**
	* 按質量壓縮圖片
	*
	* @param src         bitmap圖片
	* @param maxByteSize 最大位元組數
	* @param recycle
	* @return
	*/
public static byte[] compressByQuality(final Bitmap src, final long maxByteSize, final boolean recycle) {
	ByteArrayOutputStream baos = new ByteArrayOutputStream();
	src.compress(CompressFormat.JPEG, 100, baos);
	byte[] bytes;
	if (baos.size() <= maxByteSize) {
		bytes = baos.toByteArray();
	} else {
		baos.reset();
		src.compress(CompressFormat.JPEG, 0, baos);
		if (baos.size() >= maxByteSize) {
			bytes = baos.toByteArray();
		} else {
			// find the best quality using binary search
			int st = 0;
			int end = 100;
			int mid = 0;
			while (st < end) {
				mid = (st + end) / 2;
				baos.reset();
				src.compress(CompressFormat.JPEG, mid, baos);
				int len = baos.size();
				if (len == maxByteSize) {
					break;
				} else if (len > maxByteSize) {
					end = mid - 1;
				} else {
					st = mid + 1;
				}
			}
			if (end == mid - 1) {
				baos.reset();
				src.compress(CompressFormat.JPEG, st, baos);
			}
			bytes = baos.toByteArray();
		}
	}
	if (recycle && !src.isRecycled()) src.recycle();
	return bytes;
}
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五、微信分享

WXWebpageObject object = new WXWebpageObject();
object.webpageUrl = url;
WXMediaMessage wxMediaMessage = new WXMediaMessage(object);
// 標題
wxMediaMessage.title = title;
// 描述
wxMediaMessage.description = des.substring(0, 20);
// 圖片
wxMediaMessage.thumbData = Util.getHtmlByteArray(image);
//構造一個Req
SendMessageToWX.Req req = new SendMessageToWX.Req();
req.transaction = String.valueOf(System.currentTimeMillis());
req.message = wxMediaMessage;
req.scene = SendMessageToWX.Req.WXSceneSession;
mIWXAPI.sendReq(req);
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六、原始碼

WechatShareUtil類

https://github.com/sdwfqin/AndroidQuick

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