android 微信图片压缩,Android微信分享图片按质量压缩的解决方案

一、杂谈

微信分享图片的迷之bug，前一阵子接盘一个Hybrid App，分享要用原生的分享，搞了一阵子把微信分享搞上，测试又反馈了一个谜一样的Bug，我这边看Log打印了checkArgs fail, thumbData is invalid，google一番都说是图片不能超过32kb，在分享里面看到如下判断this.thumbData.length > '耀'，一时间没有反应过来。。。可是怎么压缩好哇，我参照官方Demo和AndroidUtilCode的按质量压缩方法，找出了下面的解决方案，供大家参考。

二、将网络图片加载到内存

保存到本地在操作真心感觉麻烦

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();

}

// 将io流转为byte数组

byte[] data = inputStreamToByte(inStream);

// 转换为bitmap

Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);

// 获取压缩后的byte数组

byte[] bytes = compressByQuality(bitmap, '耀', true);

return bytes;

}

三、将io流转为byte数组

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;

}

四、按质量压缩

/**

* 按质量压缩图片

*

* @param src bitmap图片

* @param maxByteSize 最大字节数

* @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;

}

五、微信分享

WXWebpageObject object = new WXWebpageObject();

object.webpageUrl = url;

WXMediaMessage wxMediaMessage = new WXMediaMessage(object);

// 标题

wxMediaMessage.title = title;

// 描述

wxMediaMessage.description = des.substring(0, 20);

// 图片

wxMediaMessage.thumbData = Util.getHtmlByteArray(image);

//构造一个Req

SendMessageToWX.Req req = new SendMessageToWX.Req();

req.transaction = String.valueOf(System.currentTimeMillis());

req.message = wxMediaMessage;

req.scene = SendMessageToWX.Req.WXSceneSession;

mIWXAPI.sendReq(req);

六、源码

WechatShareUtil类